How to handle multiple requests from single client??

Question

hi all
I wrote a client server program to handle requests from client.I have 2 types of requests, one is to submit comments to the server other is to view comments on the server.I have tested the app and it works fine for either of them(independently) but they don't work both together i.e when i submit a comment and view it,it's stuck and when i close the program it gives SocketException :Connection reset.
on client side:
My request is just a string
on the server side:
I check the string and give the client what it wants.
I want to know if there's any other way to send requests other than passing it as a string.
I can post my code if needed.
thanks,
Sree

Answer 1

Here is my client code,minimized it to the extent possible and it might give some compilation problems since i didn't include all the functions needed but i think you should be able to get an idea if i'm doing something wrong.
Can give you my server code if needed.
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;
import javax.swing.JButton;
public class Test {
     JButton submit_button;
     JButton view_button;
     Socket client;
      JButton get_submit_button() {
               if (submit_button == null) {
                    submit_button = new JButton();
                    submit_button.setText("Submit");
                    submit_button.addActionListener(new java.awt.event.ActionListener() {
                         public void actionPerformed(java.awt.event.ActionEvent e) {
                              send_comments_to_server();
               return submit_button;
           Socket check_client_connection(){
               String host = "C001192097";     //server host name
               if(client == null || client.isClosed()){
                try {
                     client  = new Socket(host, 4321);
                }catch (UnknownHostException exception){
                     System.err.println(host + ": unknown host.");
                catch (IOException exception){
                     System.err.println("I/O error with " + host);
               return client;
          void send_comments_to_server(){
                try
                     Socket client = check_client_connection();
                     DataOutputStream output_stream = new DataOutputStream(client.getOutputStream());
                     BufferedReader stream_input = new BufferedReader(new InputStreamReader(client.getInputStream()));
                     String comment_report = "comments";
                     Comments comment = new Comments();
                     User_Data user_data = new User_Data(); //function that returns client details such as host name and stuff
                     String user_info = "User Name: "+user_data.user_name+" "+"Host Name: "+user_data.host_name+" "+"Domain Name: "+ user_data.domain_name;
                     comment.user_info = user_info;
                     comment.summary = comment_report;
                     comment.comments = "passing comments";
                     String report = user_info+" "+comment_report+" ";
                     output_stream.writeBytes(report+"\n");
//                     output_stream.close();
//                     stream_input.close();
//                     client.close();
                }catch(IOException e){
                     e.printStackTrace();
          void receive_comments_from_server(){
               String line;
               StringBuffer comments = new StringBuffer();
               try
                     Socket client = check_client_connection();
                     DataOutputStream output_stream = new DataOutputStream(client.getOutputStream());
                     BufferedReader stream_input = new BufferedReader(new InputStreamReader(client.getInputStream()));
                     String msg = "view comments";
                     output_stream.writeBytes(msg);
                     System.out.println("waiting for response");
                         while((line = stream_input.readLine()) != null){
                              comments.append(line);
                          System.out.println("Comments from server "+comments);     
                    } catch (IOException e) {
                         e.printStackTrace();
          JButton get_view_button() {
               if (view_button == null) {
                    view_button = new JButton();
                    view_button.setText("View Comments");
                    view_button.addActionListener(new java.awt.event.ActionListener() {
                         public void actionPerformed(java.awt.event.ActionEvent e) {
                              System.out.println("request sent");
                              receive_comments_from_server();
               return view_button;
}thanks
Sree