SSL Sockets-Proxy Client && Server
Hi,
I used to connect a static ip server from client behind proxy.I used ssl and achieved.When i gave proxy server ip and port manually my code works.If i try to find those by program ,socket is not created.I posted by code below.Please help
* SSLClient.java
* Created on August 14, 2007, 11:47 AM
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
* @author Administrator
import java.net.*;
import java.io.*;
import javax.net.ssl.*;
import java.util.*;
public class SSLClient {
private SSLSocketFactory dfactory;
private String tunnelHost;
private int tunnelPort;
HashMap rec=new HashMap();
SSLSocket result ;
Socket tunnel;
static InetSocketAddress addr;
/** Creates a new instance of SSLClient */
public SSLClient(String proxyhost, String proxyport) {
System.out.println("Test");
tunnelHost = proxyhost;
tunnelPort = Integer.parseInt(proxyport);
System.setProperty("https.proxyHost",tunnelHost);
System.setProperty("https.proxyPort",""+tunnelPort);
tunnelHost= System.getProperty("https.proxyHost");
tunnelPort=Integer.parseInt( System.getProperty("https.proxyPort"));
System.setProperty("java.protocol.handler.pkgs", "com.sun.net.ssl.internal.www.protocol");
System.out.println("Connected --1"+tunnelHost+" "+tunnelPort);
System.out.println("Testing"+tunnelHost+tunnelPort);
try {
dfactory = (SSLSocketFactory)SSLSocketFactory.getDefault();
System.out.println("1 "+dfactory.toString());
Socket ss=createSocket("59.144.49.75",2500);
System.out.println("2");
} catch (Exception e) {
System.out.println("Exception"+e);
public Socket createSocket(String host, int port) throws IOException, UnknownHostException {
return createSocket(null,host,port,true);
public Socket createSocket(Socket s, String host, int port,
boolean autoClose)
throws IOException,UnknownHostException {
try {
System.out.println("Connected --");
tunnel = new Socket(tunnelHost,tunnelPort);
System.out.println("Connected"+tunnel);
doTunnelHandshake(tunnel,host,port);
result = (SSLSocket)dfactory.createSocket(tunnel,host,port,autoClose);
System.out.println("result"+result);
} catch (Exception e) {
System.out.println("Exc123"+e);
result.addHandshakeCompletedListener(
new HandshakeCompletedListener() {
public void handshakeCompleted(HandshakeCompletedEvent event) {
System.out.println("Handshake finished!");
System.out.println(
"\t CipherSuite:" + event.getCipherSuite());
System.out.println(
"\t SessionId " + event.getSession());
System.out.println(
"\t PeerHost " + event.getSession().getPeerHost());
System.out.println("result1.startHandshake "+result);
HashMap Hm=new HashMap();
Hm.put("Nithya","Success");
ObjectOutputStream output=new ObjectOutputStream(tunnel.getOutputStream());
output.writeObject(Hm);
try {
while(true){
ObjectInputStream inn=new ObjectInputStream(tunnel.getInputStream());
rec=(HashMap)inn.readObject();
if(rec.containsKey("Vidya")){
System.out.println("Values"+rec.get("Vidya"));
if(rec.containsKey("ramya")){
System.out.println("Value2"+rec.get("ramya"));
if(rec.containsKey("raja")){
System.out.println("Value3"+rec.get("raja"));
} catch (Exception e) {
System.out.println("EXCEPTION"+e);
result.startHandshake();
System.out.println("result.startHandshake "+result);
return result;
private void doTunnelHandshake(Socket tunnel, String host, int port)
throws IOException {
System.out.println("Inside handshake");
OutputStream out = tunnel.getOutputStream();
String msg = "CONNECT " + host + ":" + port + " HTTP/1.0\n"
+ "User-Agent: "
+ sun.net.www.protocol.http.HttpURLConnection.userAgent
+ "\r\n\r\n";
System.out.println("Message "+msg);
byte b[];
try {
* We really do want ASCII7 -- the http protocol doesn't change
* with locale.
b = msg.getBytes("ASCII7");
} catch (UnsupportedEncodingException ignored) {
* If ASCII7 isn't there, something serious is wrong, but
* Paranoia Is Good (tm)
b = msg.getBytes();
out.write(b);
out.flush();
* We need to store the reply so we can create a detailed
* error message to the user.
byte reply[] = new byte[200];
int replyLen = 0;
int newlinesSeen = 0;
boolean headerDone = false; /* Done on first newline */
InputStream in = tunnel.getInputStream();
boolean error = false;
while (newlinesSeen < 2) {
int i = in.read();
if (i < 0) {
throw new IOException("Unexpected EOF from proxy");
if (i == '\n') {
headerDone = true;
++newlinesSeen;
} else if (i != '\r') {
newlinesSeen = 0;
if (!headerDone && replyLen < reply.length) {
reply[replyLen++] = (byte) i;
* Converting the byte array to a string is slightly wasteful
* in the case where the connection was successful, but it's
* insignificant compared to the network overhead.
String replyStr;
try {
replyStr = new String(reply, 0, replyLen, "ASCII7");
} catch (UnsupportedEncodingException ignored) {
replyStr = new String(reply, 0, replyLen);
/* Look for 200 connection established */
if(replyStr.toLowerCase().indexOf("200 connection established") == -1){
throw new IOException("Unable to tunnel through "
+ tunnelHost + ":" + tunnelPort
+ ". Proxy returns \"" + replyStr + "\"");
/* tunneling Handshake was successful! */
public String[] getDefaultCipherSuites(){
return dfactory.getDefaultCipherSuites();
public String[] getSupportedCipherSuites(){
return dfactory.getSupportedCipherSuites();
public static String getaddress(){
String address="";
try {
System.setProperty("java.net.useSystemProxies","true");
List l = ProxySelector.getDefault().select(
new URI("http://www.google.com/"));
for (Iterator iter = l.iterator(); iter.hasNext(); ) {
Proxy proxy = (Proxy) iter.next();
System.out.println("proxy type : " + proxy.type());
addr = (InetSocketAddress)
proxy.address();
if(addr == null) {
System.out.println("No Proxy");
} else {
System.out.println("proxy hostname : " +addr.getHostName());
address=addr.getHostName();
System.out.println("proxy port : " +addr.getPort());
} catch (Exception e) {
e.printStackTrace();
System.out.println("Valaddress"+addr.getHostName());
System.out.println("Valport"+addr.getPort());
return address;
public static String getPort(){
String port="";
try {
System.setProperty("java.net.useSystemProxies","true");
List l = ProxySelector.getDefault().select(
new URI("http://www.google.com/"));
for (Iterator iter = l.iterator(); iter.hasNext(); ) {
Proxy proxy = (Proxy) iter.next();
System.out.println("proxy type : " + proxy.type());
addr = (InetSocketAddress)
proxy.address();
if(addr == null) {
System.out.println("No Proxy");
} else {
System.out.println("proxy hostname : " +
addr.getHostName());
System.out.println("proxy port : " +
addr.getPort());
port=String.valueOf(addr.getPort());
} catch (Exception e) {
e.printStackTrace();
System.out.println("Valaddress1"+addr.getHostName());
System.out.println("Valport1"+addr.getPort());
return port;
public static void main(String[] args) {
String address1=getaddress();
String port1=getPort();
System.out.println("add:port"+address1+port1);
// System.setProperty("http.proxySet","true") ;
// System.setProperty("http.proxyHost","90.0.0.1");
// System.setProperty("http.proxyPort","80");
new SSLClient(address1,port1);
I got the error while running the program is
xc123java.net.SocketException: Malformed reply from SOCKS server
Exceptionjava.lang.NullPointerException
Please help
Thanks ejb for yopur help.Actually the control gave exception at createSocket it self.It is not going to doTunnelHandShake method.If i make change like this ,my program runs.
public static void main(String[] args) {
//String address1=getaddress();
//String port1=getPort();
//System.out.println("add:port"+address1+port1);
// System.setProperty("http.proxySet","true") ;
// System.setProperty("http.proxyHost","90.0.0.1");
// System.setProperty("http.proxyPort","80");
new SSLClient("90.0.0.1","80");
I suspect the getaddress and getport makes some changes in proxy settings.I cant able to find it.Please help.
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File transfer, read write through sockets in client server programming java
Hello All, need help again.
I am trying to create a Client server program, where, the Client first sends a file to Server, on accepting the file, the server generates another file(probably xml), send it to the client as a response, the client read the response xml, parse it and display some data. now I am successful sending the file to the server, but could not figure out how the server can create and send a xml file and send it to the client as response, please help. below are my codes for client and server
Client side
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
public class XMLSocketC
public static void main(String[] args) throws IOException
//Establish a connection to socket
Socket toServer = null;
String host = "127.0.0.1";
int port = 4444;
try
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} catch (UnknownHostException e) {
System.err.println("Don't know about host: localhost.");
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to host.");
System.exit(1);
//Send file over Socket
//===========================================================
BufferedInputStream fileIn = null;
BufferedOutputStream out = null;
// File to be send over the socket.
File file = new File("c:/xampp/htdocs/thesis/sensorList.php");
// Checking for the file to be sent.
if (!file.exists())
System.out.println("File doesn't exist");
System.exit(0);
try
// InputStream to read the file
fileIn = new BufferedInputStream(new FileInputStream(file));
}catch(IOException eee)
System.out.println("Problem, kunne ikke lage fil");
try
InetAddress adressen = InetAddress.getByName(host);
try
System.out.println("Establishing Socket Connection");
// Opening Socket
Socket s = new Socket(adressen, port);
System.out.println("Socket is clear and available.....");
// OutputStream to socket
out = new BufferedOutputStream(s.getOutputStream());
byte[] buffer = new byte[1024];
int numRead;
//Checking if bytes available to read to the buffer.
while( (numRead = fileIn.read(buffer)) >= 0)
// Writes bytes to Output Stream from 0 to total number of bytes
out.write(buffer, 0, numRead);
// Flush - send file
out.flush();
// close OutputStream
out.close();
// close InputStrean
fileIn.close();
}catch (IOException e)
}catch(UnknownHostException e)
System.err.println(e);
//===========================================================
//Retrieve data from Socket.
//BufferedReader in = new BufferedReader(new InputStreamReader(toServer.getInputStream()));
DataInputStream in = new DataInputStream(new BufferedInputStream(toServer.getInputStream()));
//String fromServer;
//Read from the server and prints.
//Receive text from server
FileWriter fr = null;
String frn = "xxx_response.xml";
try {
fr = new FileWriter(frn);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
try{
String line = in.readUTF(); //.readLine();
System.out.println("Text received :" + line);
fr.write(line);
} catch (IOException e){
System.out.println("Read failed");
System.exit(1);
in.close();
toServer.close();
public class XMLSocketS
public static void main(String[] args) throws IOException
//Establish a connection to socket
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(4444);
} catch (IOException e) {
System.err.println("Could not listen on port: 4444.");
System.exit(1);
Socket clientLink = null;
while (true)
try
clientLink = serverSocket.accept();
System.out.println("Server accepts");
BufferedInputStream inn = new BufferedInputStream(clientLink.getInputStream());
BufferedOutputStream ut = new BufferedOutputStream(new FileOutputStream(new File("c:/xampp/htdocs/received_from_client.txt")));
byte[] buff = new byte[1024];
int readMe;
while( (readMe = inn.read(buff)) >= 0)
{ //reads from input stream, writes the file to disk
ut.write(buff, 0, readMe);
// close the link to client
clientLink.close();
// close InputStream
inn.close();
// flush
ut.flush();
// close OutputStream
ut.close();
//Sending response to client
//============================================================
//============================================================
System.out.println("File received");
}catch(IOException ex)
{System.out.println("Exception.");}
finally
try
if (clientLink != null) clientLink.close();
}catch(IOException e) {}
clientLink.close();
//serverSocket.close();
}SERVER
import java.net.*;
import java.io.*;
public class XMLSocketS
public static void main(String[] args) throws IOException
//Establish a connection to socket
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(4545);
} catch (IOException e) {
System.err.println("Could not listen on port: 4444.");
System.exit(1);
Socket clientLink = null;
try
clientLink = serverSocket.accept();
System.out.println("Server accepts the client request.....");
BufferedInputStream inn = new BufferedInputStream(clientLink.getInputStream());
BufferedOutputStream ut = new BufferedOutputStream(new FileOutputStream(new File("c:/xampp/htdocs/received_from_client.txt")));
byte[] buff = new byte[1024];
int readMe;
while( (readMe = inn.read(buff)) >= 0)
{ //reads from input stream, writes the file to disk
ut.write(buff, 0, readMe);
ut.flush();
//Sending response to client
//============================================================
BufferedInputStream ftoC = null;
BufferedOutputStream outtoC = null;
// File to be send over the socket.
File file = new File("c:/xampp/htdocs/thesis/user_registration_response.xml");
try
// InputStream to read the file
ftoC = new BufferedInputStream(new FileInputStream(file));
}catch(IOException eee)
{System.out.println("Problem reading file");}
// OutputStream to socket
outtoC = new BufferedOutputStream(clientLink.getOutputStream());
byte[] buffer = new byte[1024];
int noRead;
//Checking if bytes available to read to the buffer.
while( (noRead = ftoC.read(buffer)) >= 0)
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outtoC.write(buffer, 0, noRead);
outtoC.flush();
//============================================================
System.out.println("File received");
}catch(IOException ex)
{System.out.println("Exception.");}
finally
try
if (clientLink != null) clientLink.close();
}catch(IOException e) {}
clientLink.close();
//serverSocket.close();
}CLIENT SIDE
import java.io.*;
import java.net.*;
public class XMLSocketC
@SuppressWarnings("deprecation")
public static void main(String[] args)
// Server: "localhost" here. And port to connect is 4545.
String host = "127.0.0.1";
int port = 4545;
BufferedInputStream fileIn = null;
BufferedOutputStream out = null;
// File to be send over the socket.
File file = new File("c:/xampp/htdocs/thesis/sensorList.xml");
try
// InputStream to read the file
fileIn = new BufferedInputStream(new FileInputStream(file));
}catch(IOException eee)
{System.out.println("Problem");}
try
System.out.println("Establishing Socket Connection");
// Opening Socket
Socket clientSocket = new Socket(host, port);
System.out.println("Socket is clear and available.....");
// OutputStream to socket
out = new BufferedOutputStream(clientSocket.getOutputStream());
byte[] buffer = new byte[1024];
int numRead;
//Checking if bytes available to read to the buffer.
while( (numRead = fileIn.read(buffer)) >= 0)
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out.write(buffer, 0, numRead);
// Flush - send file
out.flush();
//=======================================
DataInputStream in = new DataInputStream(new BufferedInputStream(clientSocket.getInputStream()));
BufferedWriter outf = new BufferedWriter(new FileWriter("c:/xampp/htdocs/received_from_server.txt",true));
String str;
while(!(str = in.readLine()).equals("EOF")) {
System.out.println("client : Read line -> <" + str + ">");
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outf.newLine();//write a new line to the file (for better format)
outf.flush();
//=======================================
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out.close();
// close InputStrean
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{System.out.println("Exception.");}
Could you please point where am I doing the stupid mistake, client to server is working properly, but the opposite direction is not.
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Connection Problem while client is behind proxy and server out side proxy
hello
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but when my server is on internate and client is behind proxy and try to connect with server
it not able to connect i get exception.
i serch most of forum i got same answer and i try it but i was not success.
any kind of help is appriciated.
i attached my code(which i implement for testing ) pls reply me
thanks in advance.
Server.java
import java.lang.*;
import java.io.*;
import java.net.*;
class Server {
public static void main(String args[]) {
String data = "you are successfully connected with server.";
try {
ServerSocket srvs = new ServerSocket(1234);
Socket skt = srvs.accept();
System.out.print("Server has connected!\n");
PrintWriter out = new PrintWriter(skt.getOutputStream(), true);
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ProxyClient.java
import java.io.*;
import java.net.*;
import java.util.*;
class ProxyClient{
public static void main(String args[]) {
String host="61.17.212.29";
int port=1234;
String line;
Properties properties = System.getProperties();
/*properties.put("firewallSet", "true");
properties.put("firewallHost", "192.168.0.1");
properties.put("firewallPort", "808");*/
properties.put("socksProxySet","true");
properties.put("socksProxyHost", "192.168.0.1");
properties.put("socksProxyPort", "1080");
System.setProperties (properties);
try {
/*SocketAddress addr = new InetSocketAddress("192.168.0.1", 1080);
Proxy proxy = new Proxy(Proxy.Type.SOCKS, addr);
Socket skt = new Socket(proxy);
InetSocketAddress dest = new InetSocketAddress("61.17.212.29",1234);
skt.connect(dest);*/
System.out.println("before socket taken");
Socket skt = new Socket(host,port);
System.out.println("after socket taken");
BufferedReader networkBin = new BufferedReader(new InputStreamReader(skt.getInputStream()));
System.out.println("Received string: '");
line = networkBin.readLine(); // Read one line
while(true)
System.out.println(line); // Output the line
line = networkBin.readLine(); // Read the next line, if any
catch(Exception e) {
System.out.print("Whoops! It didn't work!\n");
e.printStackTrace();
}Now look here. I could not care less about this
code. I don't know anything about it, I don't
want to know, I have already recommended you don't
use it, and I have also given you a simpler and
better solution. If you don't want to take my advice
that is your privilege and your problem.ya i has understand system propertis i have setted and u can see it in the code i have tried by both system properties and also J2SE 5.0 proxy class but i got a same problem malformed Exception server refuse to connection.
is there any problem at sever side?
can u tell me in which way u r teling to set the propery i m looking forward for ur reply.
ya i m sure u will give me.................reply "ejp".
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Web Service Proxy client to invoke a Web service on SSL (Jdev 10.1.3.1)
Hi,
I have to develope a Web Service proxy client to invoke a web service on SSL. First I'm testing with OC4J 10.1.3.1 and JDEV 10.1.3.1 and did this:
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2) Made a test with a browser, it worked OK
3) Generated a proxy client from JDev 10.1.3.1 to invoke web service, it worked OK
--- Now make it work on SSL----
4) Then, added SSL configuration to oc4j , generated a certificate with keytool (updated server.xml, secure-web-site.xml), and shutting down and starting the OC4j instance.
5) Import the certificate to JAVA_HOME/jre/lib/security/cacerts
6) Test web service from browser on https and worked OK.
7) When tried to modified proxy client (generated in step 3) to make it work on SSL, I realized that just changing the END_POINT to the new url (https) it worked!
Questions----
1.- By default the proxy client generated from JDEV 10.1.3.1 knows how to deal with SSL conections?
2.- If I dont have previously the server certificate to import it into JAVA keystore (cacerts) how could I ,from proxy client code, capture it and import it before the validation occurs... because if the certificate is not in keystore , the program fails.
Thanks in advance
J.Hi,
Could you please provide me with the steps necessary to create a web service proxy client through JDeveloper or any other mechanism when 2 way SSL (requiring client authentication) is enabled.
Thanks a lot in advance
Nilesh -
Should i use secure sockets for my whole client/server application?
Hi,
I have a client server application, and I want to ensure that the login process is secure (i.e. use secure sockets). but I dont know how to switch back to a normal socket once that is done.
So I am left thinking that i should just use SSL for my whole application, which can last pretty long. But I would rather not. Is there any other way of doing this?
or should I just encrypt the login info using MD5 or something like that, then send it over an unsecure socket?
thanks!Hey,
Are you sure you haven't confused JGSS for JSSE?
Imagine you have a client-server system and you sometimes want data sent over the wire to be encrypted... JGSS offers you this flexibility; if you a encrypted transmission, run ift through JGSS before transmitting it; if you don't want an encrypted transmission, bypass JGSS and just send the transmission.
The benefit is the security (encryption) isn't hard-wired into you communications protocol i.e. TLS. JGSS has nothing to do with connections it is just protocol for securing messages, not sending them.
You would need to establish the secure context but this could be done at startup and persist for the duration of you applicaiton invocation. You perhaps might need to implement a mechanism to identify encrypted messages on the receiving peer (so it knows to attempt decryption).
Admittedly, kerberos seems like one of those 'inside-joke' things. I've come to realise if you don't have some sort of kerberos realm/server against which to authenticate - you need to swap it out as the underlying mechanism. How this is done I'm not sure yet, but I intend to find out today....further down the rabbit hole I go!
If I discover anything helpful, I will let you know.
Warm regards,
D -
ACE functionally question - SSL tunnelling / proxy on behalf of non SSL client
Hi
Can the ACE perform SSL tunnelling of web services(HTTP) traffic. Can ACE perform SSL tunnelling/proxy on behalf of a non SSL client.
Example:
Client (HTTP) ---->>> (HTTP)Cisco ACE(HTTPS) ------>>>>(HTTPS) Server
The "client" Server does not support SSL.
Can an ACE tunnel the web services traffic inside an SSL tunnel to a specific destination server on behalf of the client server (that does not support SSL)
Are there any other Cisco products that could be used to perform this SSL tunnelling on behalf of a non SSL Client.
RegardsHello Byron,
Yes, the ACE can do it
Here you have some of the flavors of SSL with the ACE.
Here you have a sample about it:
parameter-map type http CASE_PARAM
case-insensitive
persistence-rebalance
set header-maxparse-length 65535
set content-maxparse-length 65535
class-map match-all CLEAR_TEXT_VIP
2 match virtual-address 172.20.120.19 tcp eq www
policy-map multi-match JORGE-MULTIMATCH
class CLEAR_TEXT_VIP
loadbalance vip inservice
loadbalance policy POLICY_TO_ENCRYPT_TRAFFIC
loadbalance vip icmp-reply active
appl-parameter http advanced-options CASE_PARAM
policy-map type loadbalance first-match POLICY_TO_ENCRYPT_TRAFFIC
class class-default
serverfarm ENCRYPTED-SERVERFARM
ssl-proxy client SSL-PROXY-JORGE
ssl-proxy service SSL-PROXY-JORGE
key TAC-key
cert TAC-cert
serverfarm host ENCRYPTED-SERVERFARM
rserver JORGE-SERVER 443
inservice
Here you have some additional details under the configuration guide:
http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/ace_appliances/vA3_1_0/configuration/ssl/guide/initiate.html
Here you have some additional samples:
http://docwiki.cisco.com/wiki/Cisco_Application_Control_Engine_%28ACE%29_Configuration_Examples_--_SSL_Configuration_Examples
Hope this helps for you and fix your issue
Jorge -
Hi,
As the name of the forum suggests I am very new to this whole thing.
I am trying to write a client/server socket program that can encrypt and decrypt and has a GUI, can't use JCE or SSL or any built in encryption tools.
I have the code for everything cept the encryption part.
Any help, greatly appreciated,tnks a million but how do i incorporate that into the following client and server code:
here's the client code:
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
class SocketClient extends JFrame
implements ActionListener {
JLabel text, clicked;
JButton button;
JPanel panel;
JTextField textField;
Socket socket = null;
PrintWriter out = null;
BufferedReader in = null;
SocketClient(){ //Begin Constructor
text = new JLabel("Text to send over socket:");
textField = new JTextField(20);
button = new JButton("Click Me");
button.addActionListener(this);
panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.setBackground(Color.white);
getContentPane().add(panel);
panel.add("North", text);
panel.add("Center", textField);
panel.add("South", button);
} //End Constructor
public void actionPerformed(ActionEvent event){
Object source = event.getSource();
if(source == button){
//Send data over socket
String text = textField.getText();
out.println(text);
textField.setText(new String(""));
//Receive text from server
try{
String line = in.readLine();
System.out.println("Text received :" + line);
} catch (IOException e){
System.out.println("Read failed");
System.exit(1);
public void listenSocket(){
//Create socket connection
try{
socket = new Socket("HUGHESAN", 4444);
out = new PrintWriter(socket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
} catch (UnknownHostException e) {
System.out.println("Unknown host: HUGHESAN.eng");
System.exit(1);
} catch (IOException e) {
System.out.println("No I/O");
System.exit(1);
public static void main(String[] args){
SocketClient frame = new SocketClient();
frame.setTitle("Client Program");
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
frame.addWindowListener(l);
frame.pack();
frame.setVisible(true);
frame.listenSocket();
SERVER Code
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
class SocketServer extends JFrame
implements ActionListener {
JButton button;
JLabel label = new JLabel("Text received over socket:");
JPanel panel;
JTextArea textArea = new JTextArea();
ServerSocket server = null;
Socket client = null;
BufferedReader in = null;
PrintWriter out = null;
String line;
SocketServer(){ //Begin Constructor
button = new JButton("Click Me");
button.addActionListener(this);
panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.setBackground(Color.white);
getContentPane().add(panel);
panel.add("North", label);
panel.add("Center", textArea);
panel.add("South", button);
} //End Constructor
public void actionPerformed(ActionEvent event) {
Object source = event.getSource();
if(source == button){
textArea.setText(line);
public void listenSocket(){
try{
server = new ServerSocket(4444);
} catch (IOException e) {
System.out.println("Could not listen on port 4444");
System.exit(-1);
try{
client = server.accept();
} catch (IOException e) {
System.out.println("Accept failed: 4444");
System.exit(-1);
try{
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
out = new PrintWriter(client.getOutputStream(), true);
} catch (IOException e) {
System.out.println("Accept failed: 4444");
System.exit(-1);
while(true){
try{
line = in.readLine();
//Send data back to client
out.println(line);
} catch (IOException e) {
System.out.println("Read failed");
System.exit(-1);
protected void finalize(){
//Clean up
try{
in.close();
out.close();
server.close();
} catch (IOException e) {
System.out.println("Could not close.");
System.exit(-1);
public static void main(String[] args){
SocketServer frame = new SocketServer();
frame.setTitle("Server Program");
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
frame.addWindowListener(l);
frame.pack();
frame.setVisible(true);
frame.listenSocket();
Again help on this is very welcomed -
Sockets: How can server detect that client is no longer connected?
Hi,
I really need help and advice with the following problem:
I have a Client - Server socket program.
The server listens on port 30000 using a server socket on one machine
The client connects to localhost on port 20000, previously creating an ssh port forward connection using the Jsch package from www.jcraft.com with
"session.setPortForwardingL(20000, addr, 30000);"
Then the client sends Strings to the server using a PrintWriter.
Both are connected to each other through the internet and the server uses a dynamic dns service.
This all works well until the IP address of the Server changes, The client successfully reconnects to the server using the dynamic dns domain name, but the server keeps listening on the old socket from the previous connection, while opening a new one for the new client connection. The server doesn't seem to notice that Client has disconnected because of this IP address change.
looks like the server is stuck inside the while loop. If i cut the connection manually on the client side, the server seems to notice that the client has disconnected, and jumps out of the while look (see code below)
this is the code I'm using for the server:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.util.logging.Logger ;
public class SocketHandler extends Thread {
static Logger logger = Logger.getLogger("Server.SocketHandler");
private Socket clientSocket = null;
private BufferedReader in = null;
private InputStreamReader inReader = null;
public SocketHandler(Socket clientSocket) throws IOException {
this.clientSocket = clientSocket;
inReader = new InputStreamReader(clientSocket.getInputStream ());
in = new BufferedReader(inReader);
public void run() {
try {
String clientMessage = null;
while ((clientMessage = in.readLine()) != null) {
logger.info("client says: " + clientMessage);
} catch (IOException e) {
logger.severe(e.getMessage());
e.printStackTrace();
} finally {
try {
logger.info("closing client Socket: " + clientSocket);
clientSocket.close();
in.close();
ServerRunner.list.remove(clientSocket);
logger.info("currently "+ServerRunner.list.size()+" clients connected");
} catch (IOException e) {
logger.severe (e.getMessage());
e.printStackTrace();
}I've tried making the server create some artificial traffing by writing some byte every few seconds into the clients OutputStream. However I get no exceptions when the IP address changes. The server doesn't detect a disconnected socket connection.
I'd really appreciate help and adviceIf a TCP/IP peer is shut down "uncleanly", the other end of the connection doesn't get the final end of connection packet, and read() will wait forever. close() sends the final packet, as will killing the peer process (the OS does the close()). But if the OS crashes or for some other reason can't send the final packet, the server never gets notification that the peer has gone away.
Like you say, one way is timeout, if the protocol is such that there always is something coming in at regular intervals.
The other way is a heartbeat. Write something to the other end periodically, just some kind of "hello, I'm here, ignore this message". The other end doesn't even have to answer. If the peer has gone away, TCP will retransmit your heartbeat message a few times. After about a minute it will give up, and mark the socket as broken. read() will then throw an IOException. You could send heartbeats from the client too, so that the client detects if the server computer dies.
TCP/IP also has a TCP-level heartbeat; see Socket.setKeepAlive(). The heartbeat interval is about two hours, so it takes it a while to detect broken connections. -
Best practice for client-server(Socket) application
I want to build a client-server application
1) On startup.. client creates connection to Server and keeps reading data from server
2) Server keeps on sending different messages
3) Based on messages(Async) from server client view has to be changed
I tried different cases ended up facing IllegalStateChangeException while updating GUI
So what is the best way to do this?
Please give a working example .
Thanks,
Vijay
Edited by: 844427 on Jan 12, 2012 12:15 AM
Edited by: 844427 on Jan 12, 2012 12:16 AMHi EJP,
Thanks for the suggestion ,
Here is sample code :
public class Lobby implements LobbyModelsChangeListener{
Stage stage;
ListView<String> listView;
ObservableList ol;
public Lobby(Stage primaryStage) {
stage = primaryStage;
ProxyServer.startReadFromServer();//Connects to Socket Server
ProxyServer.addLobbyModelChangeListener(this);//So that any data from server is fetched to Lobby
init();
private void init() {
ProxyServer.getLobbyList();//Send
ol = FXCollections.observableArrayList(
"Loading Data..."
ol.addListener(new ListChangeListener(){
@Override
public void onChanged(Change change) {
listView.setItems(ol);
Group root = new Group();
stage.setScene(new Scene(root));
listView = new ListView<String>();
listView.maxWidth(stage.getWidth());
listView.setItems(ol);
listView.getSelectionModel().setSelectionMode(SelectionMode.SINGLE);
istView.setOnMouseClicked(new EventHandler<MouseEvent>(){
@Override
public void handle(MouseEvent t) {
// ListView lv = (ListView) t.getSource();
new NewPage(stage);
root.getChildren().add(listView);
@Override
public void updateLobby(LobbyListModel[] changes) {
// listView.getItems().clear();
String[] ar = new String[changes.length];
for(int i=0;i<changes.length;i++)
if(changes!=null)
System.out.println(changes[i].getName());
ar[i] = changes[i].getName();
ol.addAll(ar);
ProxyServer.javaProxyServer
//Implements runnable
public void run()
......//code to read data from server
//make array of LobbyListModel[] ltm based on data from server
fireLobbyModelChangeEvent(ltm);
void addLobbyModelChangeListener(LobbyModelsChangeListener aThis) {
this.lobbyModelsChangeListener = aThis;
private void fireLobbyModelChangeEvent(LobbyListModel[] changes) {
LobbyModelsChangeListener listner
= (LobbyModelsChangeListener) lobbyModelsChangeListener;
listner.updateLobby(changes);
Exception :
java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-5
at line ol.addAll(ar);
But ListView is getting updated with new data...so not sure if its right way to proceed...
Thanks,
Vijay -
FU Ant task failure: java.util.concurrent.ExecutionException: could not close client/server socket
We sometimes see this failure intermitently when using the FlexUnit Ant task to run tests in a CI environment. The Ant task throws this exception:
java.util.concurrent.ExecutionException: could not close client/server socket
I have seen this for a while now, and still see it with the latest 4.1 RC versions.
Here is the console output seen along with the above exception:
FlexUnit player target: flash
Validating task attributes ...
Generating default values ...
Using default working dir [C:\DJTE\commons.formatter_swc\d3flxcmn32\extracted\Source\Flex]
Using the following settings for the test run:
FLEX_HOME: [C:\dev\vert-d3flxcmn32\302100.41.0.20110323122739_d3flxcmn32]
haltonfailure: [false]
headless: [false]
display: [99]
localTrusted: [true]
player: [flash]
port: [1024]
swf: [C:\DJTE\commons.formatter_swc\d3flxcmn32\extracted\build\commons.formatter.tests.unit.sw f]
timeout: [1800000ms]
toDir: [C:\DJTE\commons.formatter_swc\d3flxcmn32\reports\xml]
Setting up server process ...
Entry [C:\DJTE\commons.formatter_swc\d3flxcmn32\extracted\build] already available in local trust file at [C:\Users\user\AppData\Roaming\Macromedia\Flash Player\#Security\FlashPlayerTrust\flexUnit.cfg].
Executing 'rundll32' with arguments:
'url.dll,FileProtocolHandler'
'C:\DJTE\commons.formatter_swc\d3flxcmn32\extracted\build\commons.formatter.tests.unit.swf '
The ' characters around the executable and arguments are
not part of the command.
Starting server ...
Opening server socket on port [1024].
Waiting for client connection ...
Client connected.
Setting inbound buffer size to [262144] bytes.
Receiving data ...
Sending acknowledgement to player to start sending test data ...
Stopping server ...
End of test data reached, sending acknowledgement to player ...
When the problem occurs, it is not always during the running of any particular test (that I am aware of). Recent runs where this failure was seen had the following number of tests executed (note: the total number that should be run is 45677): 18021, 18, 229.
Here is a "good" run when the problem does not occur:
Setting inbound buffer size to [262144] bytes.
Receiving data ...
Sending acknowledgement to player to start sending test data ...
Stopping server ...
End of test data reached, sending acknowledgement to player ...
Closing client connection ...
Closing server on port [1024] ...
Analyzing reports ...
Suite: com.formatters.help.TestGeographicSiteUrls
Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.008 sec
Suite: com.formatters.functionalUnitTest.testCases.TestNumericUDF
Tests run: 13, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.071 sec
Results :
Tests run: 45,677, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 201.186 sec
Has anyone else ran across this problem?
Thanks,
TrevorI am not sure if this information will help everyone, but here goes...
For us, these problems with FlexUnit tests crashing the Flash Player appear to be related to couple of factors. Recently, we moved up from Flex 3.2 to Flex 4.1 as our development baseline. Many people complained that their development environment (Flash Builder, etc.) was much more unstable. Apparently, 4.1 produces SWFs that require more memory to run than 3.2 does? Anyway, we still had Flash Player 10.1 as our runtime baseline. Apparently, that version of the player was not as capable of running larger FlexUnit test SWFs, and would crash (as I posted months earlier). I upgraded to the latest 10.3 standalone player versions, and the crashes have now ceased. It would be nice to know exactly what was causing the crashes, but memory management (or lack of) is my best guess.
So, if you are seeing these issues, try upgrading to the latest Flash Player version.
Regards,
Trevor -
Publishing .fla project including client - server socket connection
Hi,
I have designed with Adobe Flash Professional CS5 a .fla project that integrates a client - server connection.
After publishing it, I have the following issue:
- when running the generated .exe file for Windows, then the connection to the server works perfectly
- but when I am running the published .html file, then nothing is sent to the server.
I have tried to change the Publish Settings.
When setting the Local Playback Security in Flash menu to "Access network only" instead of "Access local files only" then the last packet that was send using the .exe file is resent once and that's all (the html client does not receive the response from the server and the next connection attemps generate data transfer).
I guess I have to change some security settings somewhere but I didn't find which.
Does anybody have a hint ?
Thanks.Hi again,
I was finally able to solve the issue.
I did not get any error message when using firefox, but using iExplorer provided me this error:
"Local-with-filesystem SWF files are not permitted to use sockets"
Googling did then allow me to find the solution here:
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager04.htm l
The local locations on which I store my html page during the development has to be added to the trusted locations in the global security settings.
Hope it will help some other people.
Best regards -
Applet socket problem in client-server, urgent!
Dear All:
I have implemented a client server teamwork environment. I have managered to get the server running fine. The server is responsible for passing messages between clients and accessing Oracle database using JDBC. The client is a Java Applet. The code is like the following. The problem is when I try to register the client, the socket connection get java.security.AccessControlException: access denied(java.net.SocketPermission mugca.its.monash.edu.
au resolve)
However, I have written a Java application with the same socket connection method to connect to the same server, it connects to the server without any problem. Is it because of the applet security problem? How should I solve it? Very appreciate for any ideas.
public class User extends java.applet.Applet implements ActionListener, ItemListener
public void init()
Authentication auth = new Authentication((Frame)anchorpoint);
if(auth.getConnectionStreams() != null) {
ConnectionStreams server_conn = auth.getConnectionStreams();
// Authenticates the user and establishes a connection to the server
class Authentication extends Dialog implements ActionListener, KeyListener {
// Object holding information relevant to the server connection
ConnectionStreams server_conn;
final static int port = 6012;
// Authenticates the user and establishes connection to the server
public Authentication(Frame parent) {
// call the class Dialog's constructor
super(parent, "User Authentication", true);
setLocation(parent.getSize().width/3, parent.getSize().height/2);
setupDialog();
// sets up the components of the dialog box
private void setupDialog() {
// create and set the layout manager
//Create a username text field here
//Create a password text field here
//Create a OK button here
public void actionPerformed(ActionEvent e) {
authenticateUser();
dispose();
// returns the ConnectionStreams object
public ConnectionStreams getConnectionStreams() {
return(server_conn);
// authenticates the user
private void authenticateUser() {
Socket socket;
InetAddress address;
try {
// open socket to server
System.out.println("Ready to connect to server on: " + port);
socket = new Socket("mugca.its.monash.edu.au", port);
address = socket.getInetAddress();
System.out.println("The hostname,address,hostaddress,localhost is:" + address.getHostName() + ";\n" +
address.getAddress() + ";\n" +
address.getHostAddress() + ";\n" +
address.getLocalHost());
catch(Exception e) {
displayMessage("Error occured. See console");
System.err.println(e);
e.printStackTrace();
}Hi, there:
Thanks for the help. But I don't have to configure the security policy. Instead, inspired by a message in this forum, I simply upload the applet to the HTTP server (mugca.its.monash.edu.au) where my won server is running. Then the applet is download from the server and running fine in my local machine.
Dengsheng -
Client/server socket based application
hi does anyone have example of client/server socket based application using Spring and Maven
where application do the following
Client sends a request with a path to any file on the server
„h Server reads the file and responds back with the content
„h Client outputs the content to the console
am trying to follow this
http://www2.sys-con.com/itsg/virtualcd/java/archives/0205/dibella/index.html
http://syntx.io/a-client-server-application-using-socket-programming-in-java/
am using java 6i have attempt code but i wht to do the following
client/server socket based application that will read the content of a file and stream the content of the file to the client. The client must simply output the content of the file to the console using System.out. The client must be able to run in a standalone mode (non-network mode) or in a remote mode.
Additionally the client must be designed in a way that i can print the output to a console but must be interchangeable where if requirements change i can persist the response to file or persist the response to a database.
/* Server.java*/
///ifgetBoolen= true then...
import java.io.*;
import java.net.*;
import java.util.*;
import java.sql.*;
public class Server
static String array[][];
// STEP 1 a1
// Server socket
ServerSocket listener;
// STEP 1 a2 Client connection
Socket client;
ObjectInputStream in;
ObjectOutputStream out;
public void createConnection() throws IOException
System.out.println("\nSERVER >>> Waiting for connection.....");
client = listener.accept();
String IPAddress = "" + client.getInetAddress();
DisplayMessage("SERVER >>> Connected to " + IPAddress.substring(1,IPAddress.length()));
public void runServer()
// Start listening for client connections
// STEP 2
try
listener = new ServerSocket(12345, 10);
createConnection();
// STEP 3
// processConnection();
catch(IOException ioe)
DisplayMessage("SERVER >>> Error trying to listen: " + ioe.getMessage());
private void closeConnection()
DisplayMessage("SERVER >>> Terminating connections");
try
if(out != null && in != null)
out.close();
in.close();
client.close();
catch(IOException ioe)
DisplayMessage("SERVER >>> Closing connections");
public static void define2DArray(ResultSet RS, int Size)
try
ResultSetMetaData RMSD = RS.getMetaData();
DisplayMessage("SERVER >>> Requested arraySize: " + Size);
if (RS.next())
array = new String[Size][RMSD.getColumnCount()];
for (int Row = 0; Row < Size; Row++)
for (int Col = 0; Col < RMSD.getColumnCount(); Col++)
array[Row][Col] = new String();
array[Row][Col] = RS.getString(Col+1);
DisplayMessage(array[Row][Col] + " ");
RS.next();
else
array = new String[1][1];
array[0][0] = "#No Records";
catch (Exception e)
DisplayMessage("SERVER >>> Error in defining a 2DArray: " + e.getMessage());
public static void DisplayMessage(final String IncomingSMS)
System.out.println(IncomingSMS);
//client
* @author
import java.io.*;
import java.net.*;
import javax.swing.*;
public class ClientSystem
static Socket server;
static ObjectOutputStream out;
static ObjectInputStream in;
static String Response[][];
static boolean IsConnected = false;
static int Num = 0;
public static void connectToServer() throws IOException
server = new Socket("127.0.0.1", 12345);
// server = new Socket("000.00.98.00", 12345);
String IPAddress = "" + server.getInetAddress();
DisplayMessage("\nCLIENT >>> Connected to " + IPAddress.substring(1,IPAddress.length()));
public static void getStreams() throws IOException
out = new ObjectOutputStream(server.getOutputStream());
out.flush();
in = new ObjectInputStream(server.getInputStream());
IsConnected = true;
DisplayMessage("CLIENT >>> Got I/O streams");
public static void runClient()
try
connectToServer();
getStreams();
DisplayMessage("CLIENT >>> Connection successfull....\n");
DisplayMessage("CLIENT >>> Want to talk to server");
catch (IOException ioe)
System.out.print("."+Num);
Num++;
public static void closeConnection()
try
out.close();
in.close();
server.close();
catch(IOException error)
DisplayMessage("CLIENT >>> Could not close connections");
public static void Start()
System.out.print("\nCLIENT >>> Attempting connection.....");
try
IsConnected = false;
while (IsConnected == false)
runClient();
if (IsConnected == false)
Thread.sleep(100);
catch (Exception e)
DisplayMessage("CLIENT >>> Attempting connection.....");
public static String sendSMS(String sms)
Response = new String[0][0];
try
DisplayMessage("CLIENT >>> " + sms);
out.writeObject(sms);
out.flush();
Response = (String[][])in.readObject();
DisplayMessage("CLIENT >>> Waiting for server to respond...");
for (int Row = 0; Row < Response.length; Row++)
System.out.printf( "_SERVER >>> \t");
for (int Col = 0; Col < Response[Row].length; Col++)
//DisplayMessage( "_SERVER >>> " + Response[Row][Col] + " ");
System.out.printf( "%s\t", Response[Row][Col]);
System.out.println();
DisplayMessage("CLIENT >>> Query processed successfully....\n");
catch(ClassNotFoundException cnfe)
DisplayMessage("CLIENT >>> Class not found for casting received object");
catch(IOException ioe)
reConnect();
catch (Exception sqle)
DisplayMessage("CLIENT >>> Error sending query ??? " + sqle.getMessage());
return "transmission successfull";
public static void reConnect()
try
DisplayMessage("CLIENT >>> Connection was lost. Trying to reconnect...");
closeConnection();
Thread.sleep(100);
IsConnected = false;
while (IsConnected == false)
runClient();
Thread.sleep(200);
catch (Exception e)
DisplayMessage("CLIENT >>> Error trying to Re-Connect...");
public static void DisplayMessage(final String IncomingSms)
System.out.println(IncomingSms);
System.out.printf("Isms: %s", IncomingSms); ///naah.
public static String[][] getResponse()
return Response;
public static String getResponse(int row, int col)
return Response[row][col];
how can i do below using above code
The program must be able to work in a non-networked mode. In this mode, the server and client must run in the same VM and must perform no networking, must not use loopback networking i.e: no “localhost” or “127.0.0.1”, and must not involve the serialization of any objects when communicating between the client and server components.
The operating mode is selected using the single command line argument that is permitted.
imust use a socket connection and define a protocol. networking must be entirely bypassed in the non-network mode. -
Are there any Client/Server Application (using sockets) design patterns?
Hi,
The title of the post nearly says it all. I am searching for different design patterns related with the development of a client/server application. I understand that there must be any different ways on how a client/server application can be developed.
Regards,
Sim085
Disclaimer:
When I enter in the Socket forum on this site I recieve this message "Thank you for any participation in this forum. Due to a lack of relevant activity, we have decided to archive this forum on June 16, 2006. For future posts on this topic, we suggest you use the Networking forum" and I am not allowed to create a new post! However I can see posts done yesterday! All i did is add the forum in 'my forums'. Does this happen to you people as well?Hi Sim085...How are you?
So look this:
http://forum.java.sun.com/thread.jspa?threadID=5148926&tstart=75
I don�t know if is what you want...but I hope in this^^
Ok man...If you have one example for help you is better.
[ ] -
Which digital certificate (SSL) is used when a proxy client is created
Dears,
Could someone please guide if there are more than one digital certificate (SSL) added to the SAP system, and we create a proxy client using the 'URL' (https://....) option, than which digital certificate will be used in the check done.
Thanks.
RedaThe names that go on the certificate must match the names you planned when you did the CAS namespace design.
Some details here:http://blogs.technet.com/b/exchange/archive/2014/02/28/namespace-planning-in-exchange-2013.aspx
So in your case if the cert does not match the name, then this will prompt users with errors. They need to match. As long as all your internal devices trust the issuer of the internal CA then you can use that. Installing an
enterprise CA will automatically publish it's root CA public cert into AD so it works easily.
Cheers,
Rhoderick
Microsoft Senior Exchange PFE
Blog:
http://blogs.technet.com/rmilne
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Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.
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