Can Java make server side socket connections?
I plan on placing a java file (application or applet I don't know) on a website and have my application connect to the java file and tell it to connect to another host (outside of the website's domain) and send and receive data. Is this possible? If not why? If so, then should it be an applet or an application? Would I need to have it listen on a specific port or what?
I read this (http://java.sun.com/sfaq/):
"How can an applet open a network connection to a computer on the internet?
Applets are not allowed to open network connections to any computer, except for the host that provided the .class files. This is either the host where the html page came from, or the host specified in the codebase parameter in the applet tag, with codebase taking precendence.
For example, if you try to do this from an applet that did not originate from the machine foo.com, it will fail with a security exception:
Socket s = new Socket("foo.com", 80, true);"
- sun
And it through me for a loop.
Think about this:
Any webpage may contain an applet.
Imagine the security implications if an applet could do whatever the developer wanted (erase your hard-drive, read your data, run your programs) without your permission.
Network connections are another example of the same thing.
Imagine you visit a webpage and an applet pops up that uses your computer to make a connection to government websites in an attempt to hack them.
Yikes.
So basically what happens (by default) is an applet starts of with a reduced set of permissions to protect the end user.
An application (by default) starts with more permissions you'd expect an application to have.
This is all configurable by the person who will be running the Applet or application. If someone trusts you, they can set up their runtime to give your applet all permissions, or give it a particular set of permissions. Or you can sign the applet with a digital signature, and if the end user trusts the certificate, and trusts you they can give your applet permissions that way.
Java Security, however, is not something that can be covered in one post on the forums.
You should probably look for some online tutorials/documentation or get a good book.
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Java Chat (Server, Client Socket Connection)
Assignment:
The assignment is to deliver two source codes that can run a Server (1) and Clients (2) in order to create a simpel chat program. The server has to wait and check an IP (localhost) + Port, and the client has to connect to that port and create a socket connection. The only thing that should be done is create a new socket connection for each client... and when a client sends a message, the message should be delivered to all clients connected to the server.
Problem...
However I can read an edit Java, it's difficult for me to write it. I allready found many turturials about socket connections on the internet, and tried to edit those, but they don't really do what I want unless I really write new shit. Is there a way you guys can help me with this, or that you find a really good website that fits my question?According to me ,
take string variable 'str'
Take some class ,I think u already taken.....
Scoket scoket = new Socket(IP,port);
OutputStream out;
IInputStream in;
in = socket.getInputStream();
out = socket.getOutputStream();
If sends the msg then use
out.writeObject(str);
This line sends data to the other user
msg resivce from client then use
str = in.readInput();
& this str set to the any objects out put .
Such as TextField.setText(str);
//Server.class
import java.io.EOFException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Server extends JFrame
private JTextField enterdField;
private JTextArea displayArea;
private ObjectOutputStream output;
private ObjectInputStream input;
private ServerSocket server;
private Socket connection;
private int counter=1;
public Server()
super("Server");
enterdField = new JTextField();
enterdField.setEditable(false);
enterdField.addActionListener(
new ActionListener()
public void actionPerformed(ActionEvent event)
sendData(event.getActionCommand());
//System.out.println(event.getActionCommand());
enterdField.setText("");
add(enterdField,BorderLayout.NORTH);
displayArea = new JTextArea();
add(new JScrollPane(displayArea),BorderLayout.CENTER);
setSize(300,150);
setVisible(true);
public void runServer()
try
server = new ServerSocket(12345,100);
while(true)
try
waitForConnection();
getStreams();
processConnection();
catch(EOFException eofexception)
displayMessage("\nServer terminated connection");
finally
closeConnection();
counter++;
catch(IOException ioException)
ioException.printStackTrace();
private void waitForConnection() throws IOException
displayMessage("Waiting for connection");
connection = server.accept();
//System.out.println(server.accept());
System.out.println(connection.getInetAddress());//Server Address and Hostname.
displayMessage("Connection"+counter +"received from :"+connection.getInetAddress().getHostName());
private void getStreams() throws IOException
System.out.println("Start getStream");
output = new ObjectOutputStream(connection.getOutputStream());
output.flush();
input = new ObjectInputStream(connection.getInputStream());
displayMessage("\nGot I/O stream\n");
private void processConnection() throws IOException //Read data from Client for Server.
String message="Connection sucessful To Client";
sendData(message);
int i=0;
setTextFieldEditable(true);
do
try
message =(String) input.readObject();//For Client
System.out.println("Input from :"+message);//From Client
displayMessage("\n" + message);
System.out.println("\n" + i++);
catch(ClassNotFoundException classnotfoundexception)
displayMessage("\nUnknown object type recived");
while(!message.equals("CLIENT>>>TERMINATE"));
private void closeConnection()
displayMessage("\nTeminating connection");
setTextFieldEditable(false);
try
output.close();
input.close();
connection.close();
catch(IOException ioException)
ioException.printStackTrace();
private void sendData(String message)//Write data to the Client from the Server.
try
output.writeObject("SERVER>>>"+message);//For Client side.
System.out.println(message);
output.flush();
displayMessage("\nSERVER>>>"+message);//On server side.
catch(IOException ioException)
displayMessage("\nError writing object");
private void displayMessage(final String messageToDisplay)
SwingUtilities.invokeLater(
new Runnable()
public void run()
displayArea.append(messageToDisplay);
private void setTextFieldEditable(final boolean editable)
SwingUtilities.invokeLater(
new Runnable()
public void run()
enterdField.setEditable(editable);
public static void main(String q[])
Server app = new Server();
app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
app.runServer();
//Client.class
import java.io.EOFException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Client extends JFrame
private JTextField enterField;
private JTextArea displayArea;
private ObjectOutputStream output;
private ObjectInputStream input;
private String message="";
private String chatServer;
private Socket client;
public Client (String host)
super("Client");
chatServer=host;
enterField = new JTextField();
enterField.setEditable(false);
enterField.addActionListener(
new ActionListener()
public void actionPerformed(ActionEvent event)
sendData(event.getActionCommand());
enterField.setText("");
add(enterField,BorderLayout.NORTH);
displayArea = new JTextArea();
add(new JScrollPane(displayArea),BorderLayout.CENTER);
setSize(300,150);
setVisible(true);
public void runclient()
try
connectToServer();
getStreams();
processConnection();
catch(EOFException eofException)
displayMessage("\nClient treminated connection");
catch(IOException ioException)
ioException.printStackTrace();
finally
closeConnection();
private void connectToServer() throws IOException
displayMessage("Attempting connection\n");
client = new Socket(InetAddress.getByName(chatServer),12345);
displayMessage("Connect to:"+client.getInetAddress().getHostName());
private void getStreams() throws IOException
output = new ObjectOutputStream(client.getOutputStream());
output.flush();
input = new ObjectInputStream(client.getInputStream());
//Thread t = new Thread(this,"Thread");
//t.start();
displayMessage("\nGot I/O stream\n");
private void processConnection( ) throws IOException
setTextFieldEditable(true);
do
try
message=(String)input.readObject();
displayMessage("\n"+message);
catch(ClassNotFoundException classnotfoundexception)
displayMessage("\nUnknown object type received");
while(!message.equals("SERVER>>>TERMINATE"));
private void closeConnection()
displayMessage("\n Closing connection");
setTextFieldEditable(false);
try
output.close();
input.close();
client.close();
catch(IOException ioException)
ioException.printStackTrace();
private void sendData(String message)
try
output.writeObject("CLIENT>>>"+message);
//System.out.println(message);
output.flush();
displayMessage("\nCLIENT>>>"+message);
catch(IOException ioException)
displayArea.append("\n Error writing object");
private void displayMessage(final String MessageToDisplay)
SwingUtilities.invokeLater(
new Runnable()
public void run()
displayArea.append(MessageToDisplay);
private void setTextFieldEditable(final boolean editable)
SwingUtilities.invokeLater(
new Runnable()
public void run()
enterField.setEditable(editable);
public static void main(String q[])
Client app;
if(q.length==0)
app = new Client("127.0.0.1");
else
app = new Client(q[0]);
app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
app.runclient();
Use this example .....
Give me reply.My method is correct or not
All the best -
Server/Client Socket Connection
Hi, I am trying to program a simple server/client socket connection program, the main function is to send and receive objects between them. I somehow went wrong and the connection between them keeps terminating right after establishing connection. Is there anything I can do to resolve this?
This is gonnna be kinda long post.. sorry. These are the code that starts and ends the socket connection. I'm kinda desperate for this to work.. so thanks in advance.
appinterface.java:
//Set up server to receive communications; process connections. 1x.
public void runServer () {
try {
//Create a ServerSocket
server = new ServerSocket(12345, 100);
try {
waitForSockConnection(); //Wait for a connection.
getSockStreams(); //Get input & output streams.
establishDbConnection(); //Open up connection to DB.
finally {
closeSockConnection(); //Close connection.
//Process problems with I/O
catch(IOException ioException) {
displayMessage("I/O Error: " + ioException);
runServer();
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displayMessage("Waiting for connection");
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displayMessage("Connection received from: " + connection.getInetAddress().getHostName());
//Get streams to send and receive data.
private void getSockStreams() throws IOException {
//Set up output streams for objects
ObjectOutputStream output = new ObjectOutputStream(connection.getOutputStream());
output.flush(); //Flush output buffer to send header information.
//Set up input stream for objects.
ObjectInputStream input = new ObjectInputStream(connection.getInputStream());
try {
classHolderServer holderObj = new classHolderServer();
holderObj = (classHolderServer)input.readObject();
processSockConnection(holderObj);
displayMessage("Got I/O Streams");
//Catch problems reading from client
catch (ClassNotFoundException classNotFoundException) {
displayMessage("Unknown object type received");
//Process connection with client.
private void processSockConnection(classHolderServer holderObj) throws IOException {
//sendMessage("Connection Successful");
//True is query, and false is auth.
if(holderObj.type1==true)
processDbStatement(holderObj.type2, holderObj.sqlquery);
else {
authCheck(holderObj.userName, holderObj.passWord);
if(!authCheck)
closeDbConnection();
//Send messages to client.
private void sendMessage(String message) {
// Send message to client
try {
ObjectOutputStream output = new ObjectOutputStream(connection.getOutputStream());
output.flush();
output.writeObject(message);
output.flush();
displayMessage("Message Sent:" + message);
catch (IOException ioException) {
displayMessage("\nError Sending Message: " + message);
//Send object to client
private void sendObject(Object holderObj) {
// Send object to client
try {
ObjectOutputStream output = new ObjectOutputStream(connection.getOutputStream());
output.writeObject(holderObj);
output.flush();
displayMessage("\nObject sent");
//Process problems sending object
catch (IOException ioException) {
displayMessage("\nError writing object");
//Close streams and socket.
private void closeSockConnection() {
displayMessage("Terminating connection");
try {
//output.close();
//input.close();
connection.close();
closeDbConnection();
this.userName = null;
this.passWord = null;
this.receiverId = 0;
this.authCheck = false;
catch (IOException ioException) {
displayMessage("I/O Error: " + ioException);
}Client:
private void runClient() {
//Connect to sever and process messages from server.
try{
connectToServer();
getStreams();
processConnection();
//Server closed connection.
catch(EOFException eofException) {
//displayMessage"Client Terminated Connection");
//Process problems communicating with server.
catch (IOException ioException) {
//displayMessage"Communication Problem");
finally {
closeConnection();
//Connect to server
private void connectToServer() throws IOException {
//displayMessage("Attempting connection\n");
//Create Socket to make connection to sever.
client = new Socket(InetAddress.getByName(chatServer), 12345);
//Display connection information
//displayMessage("Connected to: " + client.getInetAddress().getHostName());
//Get streams to send and receive data.
private void getStreams() throws IOException {
//Set up output stream for objects.
ObjectOutputStream output = new ObjectOutputStream(client.getOutputStream());
output.flush(); //Flush outout buffer to send header information.
//Set up input stream for objects.
ObjectInputStream input = new ObjectInputStream(client.getInputStream());
//displayMessage("\nGot I/O streams\n");
//Close socket connection.
private void closeConnection() {
//displayMessage("\nClosing connection");
try {
ObjectOutputStream output = new ObjectOutputStream(client.getOutputStream());
output.close();
ObjectInputStream input = new ObjectInputStream(client.getInputStream());
input.close();
client.close();
authCheck=false;
catch(IOException ioException) {
ioException.printStackTrace();
//Send data to server.
private void sendObject(classHolderClient queryObj) {
try {
output.writeObject(queryObj);
output.flush();
//displayMessage("Please wait..");
//Process problems sending object.
catch (IOException ioException) {
//displayMessage("\nError writing object");
//Process connection with server.
private void processConnection() throws IOException {
try{
classHolderClient holderObj = new classHolderClient();
holderObj = (classHolderClient)input.readObject();
if(holderObj.type2==2) {
this.authCheck=holderObj.authCheck;
this.userName=holderObj.userName;
this.passWord=holderObj.passWord;
catch(ClassNotFoundException classNotFoundException) {
//displayMessage(classNotFoundException);
}private ObjectOutputStream output = new ObjectOutputStream(client.getOutputStream());Like this? But this will cause an error asking me to catch an exception:
C:\Documents and Settings\Moon\My Documents\Navi Projects\School\OOPJ Project\Prototype\GPS-Lite v2 Alpha Debugger\client.java:41: unreported exception java.io.IOException; must be caught or declared to be thrown
private ObjectOutputStream output = new ObjectOutputStream(client.getOutputStream());
^
C:\Documents and Settings\Moon\My Documents\Navi Projects\School\OOPJ Project\Prototype\GPS-Lite v2 Alpha Debugger\client.java:41: unreported exception java.io.IOException; must be caught or declared to be thrown
private ObjectOutputStream output = new ObjectOutputStream(client.getOutputStream());
^
2 errors -
Ipad 2 - get a gray screen on Safari and can't make selection even though connected to internet...
ipad 2 - get a gray screen on Safari and can't make selection even though connected to internet...
Try rebooting the ipad by pressing and holding the on/off and home buttons simultaneously until the screen goes blank and you see the apple logo. It should take about 10-15 seconds to reboot.
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How can i reuse my existing socket connection
Hi,
this might sound basic, it probably is:
As part of my larger project, i have to send and recieve data to multiple socket connections.
The thing that happens is that everytime i send data, it seems that java is creating a new stream or something (code is multithreaded)
so as i send 4 items of data, a bit like a chat program sending 4 statements, it creates 4 different streams, instead of using the same stream. therefore when i close the connection, i get:
java.net.SocketException: Connection reset 4 times.
i know why.. its because i have added the:
Socket socket=new Socket(host, port);
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter out = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));
bit in the same method with the
out.println(THE DATA....);
out.flush();
The thing what i want to do is to create the connection one, and reuse the objects:
out, in and socket
to send / recieve the new data.
please help me guys,
thanksAll the threads would be able to get the same reference to....
class SocketWrapper {
private final Object readLock = new Object();
private final Object writeLock = new Object();
// client side
public SocketWrapper(String hostname, int port);
// server side.
public SocketWrapper(Socket);
// send data
public void send(Serializable object) throws IOException;
// receive data. synchronized(writeLock);
public Serializable getNext() throws IOException;
// create a new socket as required, throw IllegalState if server side. synchronized(readLock)
private void createNewSocket() throws IllegalStateException;
}The send autoconnects as required. It then send on message/packet/object.
The getNext autoconnects as required. It reads one message/packet/object and returns.
This allows multiple threads to access the same socket. It allows data to be sent while a thread is blocking on a read. (Thus two locks) -
JDBC server-side Default connection doesn't work
Hi folks
I am using Oracle 8.1.6 Personal Edition on Windows 2000 with JDK 1.2.2.
I can't connect to the database using the server side jdbc driver. Following is a simple program.
==============================================
import java.io.*;
import oracle.jdbc.driver.*;
class JdbcCheckup
public static void main (String args []) throws SQLException, IOException
// Load the Oracle JDBC driver
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver ());
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while (rset.next ())
System.out.println (rset.getString (1));
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==============================================
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Exception in thread "main" java.sql.SQLException: No suitable driver at java.sql.DriverManager.getConnection(DriverManager.java:477) at java.sql.DriverManager.getConnection(DriverManager.java:159) at oracle.jdbc.driver.OracleDriver.defaultConnection
(OracleDriver.java:2
65)
at JdbcCheckup.main(JdbcCheckup.java, Compiled Code)
All my PATH and CLASSPATH variables are pointing to the correct places. I wonder why JServer/JVM is not giving me the connection.
Thanks a bunch.
Govind
nullHi,
Try using the complete database URL address in this manner:
import java.io.*;
import java.sql.*;
class JdbcCheckup
public static void main (String args [])
try {
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@<server_name>:1521:<database_sid>",
"<user_name>",
"<password>");
// Create a statement
Statement stmt = conn.createStatement ();
// Do the SQL "Hello World" thing
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while (rset.next ())
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} catch (Exception e) {
e.printStackTrace();
} -
Nokia C3 How can I make sure it only connects thro...
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Only the website (server or domain) that sets a cookie can read that cookie, but there can be an iframe embedded with a different domain that sets so called third-party cookies.
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How can I make server use single class loader for several applications
I have several web/ejb applications. These applications use some common libraries and should share instances of classes from those libraries.
But applications are being deployed independently thus packaging all them to EAR is not acceptable.
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How can I make AS use single class loader for a set of applications?
Different applications depend on different libraries so I need a way that will not share library for all applications on the domain but only for some exact applications.
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When I tried to place common jar to *%domain%/lib/applibs* and specified --libraries* attribute on deploying I got exception
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If multiple applications or modules refer to the same libraries, classes in those libraries are automatically shared.
This can reduce the memory footprint and allow sharing of static information.Does it mean that classes should be able to be casted ?You didn't specify which version of the application server you are using, but the config is similar as long as you know what to look for. Basically, you need to change the classloader delegation. Here's how it is done in 8.2
http://download.oracle.com/docs/cd/E19830-01/819-4721/beagb/index.html -
Error while compiling AMImpl.java at server side
Hi,
When I'm trying to compile the .java files at server side I'm getting the following errors, Can some one help me what is the issue?
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
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Note: Recompile with -Xlint:deprecation for details.
Note: /econv2/app/oracle/econv2comn/java/xxafp/oracle/apps/qp/pricelistrebate/server/PricelistrebateAMImpl.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
javac: invalid flag: /econv2/app/oracle/econv2comn/java/xxafp/oracle/apps/qp/pricelistrebate/picklist/server/DivisionPicklistVOImpl.JAVA
Thanks,
MaheshHi Mahesh
check if it helps out..
http://www.rgagnon.com/javadetails/java-0521.html
AJ -
Java Application Server 9 - TCP connections
I have installed Sun Java Application Server 9 and I see that the java process that is started has a lot (more than 30) of TCP connections with a local and a remote address that are both the hostname of the machine that run JAS.
Can someone tell me what are these connections and if there is a way to decrease the amount of these connections?
Thank youI have installed Sun Java Application Server 9 and I see that the java process that is started has a lot (more than 30) of TCP connections with a local and a remote address that are both the hostname of the machine that run JAS.
Can someone tell me what are these connections and if there is a way to decrease the amount of these connections?
Thank you -
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I tryed to use my "passw.cgi"(written in Pro.c) to access database, but I failed. The reason is just as Chris. Rimmer indicated (in his answer to my another question) that my web server can not connect to my DB. In local environment, before I connect to the DB, I should first type the command:
"source /opt/bin/coraenv" to set the environment, then I can connect to the DB. But in my passw.cgi, I could not set the environmen. I tryed to use the sentence: "system("source /opt/bin/coraenv");"in my "passw.cgi" to set the environment but I failed. Could somebody tell me how I can set up the environment for my "passw.cgi"(written in Pro.c) and make it passble to connect to the DB? Thank you very much for your help!
nullHi Glossopian, did you find a remedy to this? I just renewed my contract and upgraded my phone to the harrier. Like you my last phone automatically connected to any wi fi I had already entered a password into including home, holiday accomodation, pubs etc. Now I have to manually tell it to connect every time I go out into the garden and come back into the house. Very frustrating!
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How can I make my Ipad resume connecting my facetime calls?
How can I make my ipadresume connecting my facetime calls?
You may not be able to. There seems to have been an issue with facetime over the weekend, and going by the number of people having issues It's likely that it's something Apple needs to fix.
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How can I make a side bar item in ADF 10gr3 ?
Dear experts ,
I have a requirement to make a side Bar that contains some links . so what is the adf component to do that ?
regardshow about an [url http://webcache.googleusercontent.com/search?q=cache:wUI_bwZ0WQIJ:www.oracle.com/technology/products/jdev/htdocs/partners/addins/exchange/jsf/doc/tagdoc/core/panelsidebar.html+af:panelSideBar&cd=5&hl=en&ct=clnk&gl=uk]af:panelSideBar?
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John -
Can't make double side print after installing Lion OS X 10.7.2
I'm using Canon D520 printer. With Lion OS X i can't make any duplex print.
Any one can help to fix this issue,Hi WLV_Jim2,
Apple changed the way the OS functions with the 10.6 update. Please refer to: http://helpx.adobe.com/acrobat/kb/cant-print-pdfs-mac-os.html This document outlines how to create PDF files with Acrobat 9 on OS 10.6 and later.
-David -
I am trying to establish a connection
with the database containing my Java code
I could use DriverManager.getConnection("jdbc:default:connection:") but I don't want to.
I use the following:
DriverManager.getConnection("jdbc:oracle:thin:@172.20.13.109:1521:SID","userName","userPwd");
But this returns a NULL connection. I have dbl-checked the Host IP address already. Is it because it cannot find the SID ?? Where does getConnection look to find SID ??
Does it look into TNSORANAMES.ORA to locate the SID ??
Any idea why using Thin JDBC to connect to the default database is returning me a NULL connection ??
Thanks if you can help !
nullyou asked :
Where does getConnection look to find SID ??
the answer is you must provide it !!
if your SID is "ORCL" then do the following :
DriverManager.getConnection("jdbc:oracle:thin:@172.20.13.109:1521:ORCL","userName","userPwd");
substitute your actual sid as required above.
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