Send string to socket server from applet
Am trying to send a string to socket server from my applet:
Server:
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Server extends JApplet
ServerSocket srvr;
Socket skt;
PrintWriter out;
BufferedReader in;
Server()
String data = "server";
try
srvr = new ServerSocket(5555);
skt = srvr.accept();
out = new PrintWriter(skt.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(skt.getInputStream()));
while (in.ready())
System.out.println(in.readLine());
out.print(data);
out.close();
in.close();
skt.close();
srvr.close();
catch(Exception e)
System.out.print(e);
public static void main(String[] aslan)
new Server();
My applet where I have my client:
Socket skt;
BufferedReader in;
PrintWriter out;
try
skt = new Socket("localhost", 5555);
out = new PrintWriter(skt.getOutputStream(),true);
in = new BufferedReader(new InputStreamReader(skt.getInputStream()));
while (in.ready())
System.out.println(in.readLine());
in.close();
catch(Exception e)
System.out.print(e);
public void actionPerformed( ActionEvent e )
if(e.getSource() == button)
out.println("test");
But when the button is pushed the client is supposed to send the string "test" to the server but nothing happens can someone plz help me with this?
Am trying to send a string to socket server from my
applet:
Server:
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Server extends JApplet
ServerSocket srvr;
Socket skt;
PrintWriter out;
BufferedReader in;
Server()
String data = "server";
try
srvr = new ServerSocket(5555);
skt = srvr.accept();
out = new PrintWriter(skt.getOutputStream(), true);
in = new BufferedReader(new
InputStreamReader(skt.getInputStream()));
while (in.ready())
System.out.println(in.readLine());
out.print(data);
out.close();
in.close();
skt.close();
srvr.close();
catch(Exception e)
System.out.print(e);
public static void main(String[] aslan)
new Server();
My applet where I have my client:
Socket skt;
BufferedReader in;
PrintWriter out;
try
skt = new Socket("localhost", 5555);
out = new PrintWriter(skt.getOutputStream(),true);
in = new BufferedReader(new
InputStreamReader(skt.getInputStream()));
while (in.ready())
System.out.println(in.readLine());
in.close();
catch(Exception e)
System.out.print(e);
public void actionPerformed( ActionEvent e )
if(e.getSource() == button)
out.println("test");
But when the button is pushed the client is supposed
to send the string "test" to the server but nothing
happens can someone plz help me with this? Your server code while (in.ready()) is going to block indefinitely.
Remove the while loop and just write your ouput and close the connection on the server.
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How to send string data through socket!
Is there any method to send string data over socket.
and if client send string data to server,
How to get that data in server?
Comments please!Thank for your kind answer, stoopidboi.
I solved the ploblem. ^^;
I open the source code ^^; wow~~~~~!
It will useful to many people. I spend almost 3 days to solve this problem.
The program works like this.
Client side // string data ------------------------> Server side // saving file
To
< Server Side >
* Server.java
* Auther : [email protected]
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Server extends JFrame
private JTextField enter;
private JTextArea display;
ObjectInputStream input;
DataOutputStream output;
FileOutputStream resultFile;
DataInputStream inputd;
public Server(){
super("Server");
Container c = getContentPane();
enter = new JTextField();
enter.setEnabled(false);
enter.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent ev){
//None
c.add(enter, BorderLayout.NORTH);
display = new JTextArea();
c.add(new JScrollPane(display),
BorderLayout.CENTER);
setSize(300, 150);
show();
public void runServer(){
ServerSocket server;
Socket connection;
int counter = 1;
display.setText("");
try{
server = new ServerSocket(8800, 100);
while(true){
display.append("Waiting for connection\n");
connection = server.accept();
display.append( counter + " connection is ok.\n");
display.append("Connection " + counter +
"received from: " + connection.getInetAddress().getHostName());
resultFile = new FileOutputStream("hi.txt");
output = new DataOutputStream(resultFile);
output.flush();
inputd = new DataInputStream(
connection.getInputStream()
display.append("\nGod I/O stream, I/O is opened\n");
enter.setEnabled(true);
try{
while(true){
output.write(inputd.readByte());
catch(NullPointerException e){
display.append("Null pointer Exception");
catch(IOException e){
display.append("\nIOException Occured!");
if(resultFile != null){
resultFile.flush();
resultFile.close();
display.append("\nUser Terminate connection");
enter.setEnabled(false);
resultFile.close();
inputd.close();
output.close();
connection.close();
++counter;
catch(EOFException eof){
System.out.println("Client Terminate Connection");
catch(IOException io){
io.printStackTrace();
display.append("File is created!");
public static void main(String[] args){
Server app = new Server();
app.addWindowListener(
new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
app.runServer();
< Client side >
* Client.java
* Auther : [email protected]
package Client;
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Client extends JFrame
private JTextField enter;
private JTextArea display;
DataOutputStream output;
String message = "";
public Client(){
super("Client");
Container c = getContentPane();
enter = new JTextField();
enter.setEnabled(false);
enter.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
//None
c.add(enter, BorderLayout.NORTH);
display = new JTextArea();
c.add(new JScrollPane(display), BorderLayout.CENTER);
message = message + "TT0102LO12312OB23423PO2323123423423423423" +
"MO234234LS2423346234LM2342341234ME23423423RQ12313123213" +
"SR234234234234IU234234234234OR12312312WQ123123123XD1231232" +
"Addednewlinehere\nwowowowwoww";
setSize(300, 150);
show();
public void runClient(){
Socket client;
try{
display.setText("Attemption Connection...\n");
client = new Socket(InetAddress.getByName("127.0.0.1"), 8800);
display.append("Connected to : = " +
client.getInetAddress().getHostName());
output = new DataOutputStream(
client.getOutputStream()
output.flush();
display.append("\nGot I/O Stream, Stream is opened!\n");
enter.setEnabled(true);
try{
output.writeBytes(message);
catch(IOException ev){
display.append("\nIOException occured!\n");
if(output != null) output.flush();
display.append("Closing connection.\n");
output.close();
client.close();
catch(IOException ioe){
ioe.printStackTrace();
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Client app = new Client();
app.addWindowListener(
new WindowAdapter(){
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System.exit(0);
app.runClient(); -
Send String failed using socket
Hi all,
I have just finished a program which send a string client to the host server using simple socket. The program is developed using JBuilder9 and run well in winxp pro. When the same program run in linux (red hat), the host server can only see the connection and close. The string never receive in the server side. The problem is worked out like the following
-create socket
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-send string
-close socket
Pls. comment on what I should do to debug this problem.
Thanks,
PeterHi all,
Thanks for your assistance. I have log down the following from linux using "tcpdump"
13:16:48.218624 128.128.2.161.33083 > pmon-srv0.999: P 1:42(41) ack 1 win 5840 <nop,nop,timestamp 158365 0> (DF)
13:16:48.219105 128.128.2.161.33083 > pmon-srv0.999: F 42:42(0) ack 1 win 5840 <nop,nop,timestamp 158365 0> (DF)
13:16:48.219742 pmon-srv0.999 > 128.128.2.161.33083: . ack 43 win 64199 <nop,nop,timestamp 2471694 158365> (DF)
13:16:48.219876 pmon-srv0.999 > 128.128.2.161.33083: F 1:1(0) ack 43 win 64199 <nop,nop,timestamp 2471694 158365> (DF)
13:16:48.219894 128.128.2.161.33083 > pmon-srv0.999: . ack 2 win 5840 <nop,nop,timestamp 158365 2471694> (DF)
13:17:59.746088 128.128.2.211.1633 > pmon-srv0.999: P 1:43(42) ack 1 win 17520 (DF)
13:17:59.756047 128.128.2.211.1633 > pmon-srv0.999: F 43:43(0) ack 1 win 17520 (DF)
13:17:59.756493 pmon-srv0.999 > 128.128.2.211.1633: . ack 44 win 64198 (DF)
13:17:59.756989 pmon-srv0.999 > 128.128.2.211.1633: F 1:1(0) ack 44 win 64198 (DF)
13:17:59.757103 128.128.2.211.1633 > pmon-srv0.999: . ack 2 win 17520 (DF)
128.128.2.211 is the client in winxp pro
128.128.2.161 is the client in linux
pmon-srv is the server
In the first line of each section, it shows that number of bytes have push to the server. I don't know what should I do next to solve the problem.
Here is the source code
public class pconnect {
String ip_addr;
String fromServer, toServer;
int i,port;
Socket pmSocket;
BufferedReader pm_in;
PrintWriter pm_out;
public pconnect(String ip, int portno) {
ip_addr=ip;
port=portno;
try {
pmSocket = new Socket(ip_addr, port);
pm_out = new PrintWriter( pmSocket.getOutputStream(), true );
pm_in = new BufferedReader( new InputStreamReader( pmSocket.getInputStream() ) );
} catch (Exception err) {
System.err.println(err);
System.exit(0);
public void sendMsg(String msg) {
try {
Thread.sleep(5000);
} catch (InterruptedException e){}
if (pmSocket.isConnected()) {
try {
System.out.println("Stream Status: " + pmSocket.isOutputShutdown());
System.out.println("Bound Status: " + pmSocket.isBound());
pm_out.println(msg);
if (pm_out.checkError()) {
System.out.println("Socket error");
}catch (Exception e){System.out.println("Exception: " + e);}
try {
pmSocket.close();
} catch (Exception err) {
System.err.println("Closed Error: "+err);
public static void main(String[] args) {
System.out.println(args.length);
System.out.println(args[0]);
pconnect pconnect1 = new pconnect(args[0],Integer.parseInt(args[1]));
pconnect1.sendMsg("SET00000000N|ALARM:MBX TEST|c29K1920755D");
Thanks,
Peter -
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i've got a task to create a c# windows application to do same as the applet.
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txtLoginName.setEnabled(false);
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im asking this question here because i wanna learn it as well :D
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v.add(1,imgicon);
//sending back to applet
response.setContentType("application/octet-stream");
ObjectOutputStream oboutstream=new ObjectOutputStream(response.getOutputStream());
oboutstream.writeObject(v);
oboutstream.flush();
oboutstream.close();
} catch (Exception e) {e.printStackTrace();} i really need your help. please let me out of this headche
thanks
Edited by: san_4u on Nov 24, 2007 1:00 PMBalusC wrote:
san_4u wrote:
how can i made a HttpClient PostMethod using java applets? as i have experience making request using HttpURLConnection.POST method. ok first of all i am going make a search of this only after i will tell. please be onlineOnce again, see link [3] in my first reply of your former topic.
yeah! i got the related topic at http://www.theserverside.com/tt/articles/article.tss?l=HttpClient_FileUpload. please look it, i am reading it right now and expecting to be reliable for me.
well what i got, when request made by html code(stated above) then all the form fields and file data mixed as binary data and available in HttpServletRequest.getinputstream. and at servlet side we have to use a mutipart parser of DiskFileItemFactory class that automatically parse the file data and return a FileItem object cotaing the actual file data,right?.You can also setup the MultipartFilter in your environment and don't >care about it further. Uploaded files will be available as request attributes in the servlet.is the multipartfilter class file available in jar files(that u suggested to add in yours article) so that i can use it directly? one more thing the import org.apache.commons.httpclient package is not available in these jar files, so where can got it from?
one mere question..
i looked somewhere that when we request for a file from webserver using web browser then there is a server that process our request and after retrieving that file from database it sends back as response.
now i confused that, wheather these webservers are like apache tomcat, IBM's webspher etc those processes these request or there is a unique server that always turned on and process all the request?
because, suppose in an orgnisation made it's website using its own server then, in fact, all the time it will not turned on its server or yes it will? and a user can make a search for kind of information about this orgnisation at any time.
hopes, you will have understand my quary, then please let me know the actual process
thanks
Edited by: san_4u on Nov 25, 2007 11:25 AM -
Communicating with server from an Applet.
Hi, i've written a tetris game in an applet.
But i want some way of saving the high scores of everyone on the server.
Is they anyway to communicate the final score back to the server from the applet?
I tried saving the scores to a text file but apparently the file would appear on the client.Here is some code that you may find useful. This works for the more flexible serialized object approach. For a query string, you would simply do a post on the servlet with the appropriate URL that includes the query string. However, I have found the following serialized object approach to be more convenient.
import java.net.*;
import java.io.*;
This function sends an "AppletRequest" object to the servlet and gets the response back from the servlet in the form of a "ServletResponse" object.
protected static ServletResponse talkToServlet(AppletRequest aReq) {
ServletResponse sr = new ServletResponse();
try {
// Replace the following URL by the URL of your servlet
servletURL = new URL("http://myservleturl/");
servletConn = servletURL.openConnection();
servletConn.setUseCaches (false);
servletConn.setRequestProperty("Content-Type",
"application/octet-stream");
servletConn.setDoInput(true);
servletConn.setDoOutput(true);
} catch (MalformedURLException ex) {
System.out.println("MalformedURLException"+ex.getMessage());
} catch (IOException ex) {
System.out.println("IOException"+ex.getMessage());
} catch (Exception ex) {
System.out.println ("GeneralException: " + ex.getMessage());
try {
outputToServlet = new ObjectOutputStream(servletConn.getOutputStream());
outputToServlet.writeObject(aReq);
outputToServlet.flush();
outputToServlet.close();
} catch (Exception ex) {
System.out.println("GeneralException1: "+ex.getMessage());
try {
try{
inputFrServlet = new ObjectInputStream(servletConn.getInputStream());
sr = (ServletResponse) inputFrServlet.readObject();
inputFrServlet.close();
} catch (EOFException ex) {
System.out.println("EOFException: "+ex.getMessage());
} catch (IOException e) {
System.out.println("IOException: "+e.getMessage());
e.printStackTrace();
} catch (ClassNotFoundException e) {
System.out.println("ClassNotFoundException: "+e.getMessage());
} catch (Exception e) {
System.out.println("GeneralException2: "+e.getMessage());
return(sr); -
Hi,
I am going to write a java application that sends a string so a server. I don�t know what is on the server side(someone else has written the server part) just that my program is going to use sockets and what port number and IP the server has. I first start using datagrampackets but then I have to use byte array that would not work if the server just want a string ?? What should I use?
/Thanks in advanceHi,
your question is not clear... you can convert the byte array to a string by calling toString method on the byte array.. since the server port and IP is known, try amking a socket and send a string and see what happens by opening a socket inputstream.. read from the stream to understand what the server does..
- Bibin.
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