我做了一个socket通信程序，服务器是server，用户是client

但是我同学运行用户程序，我运行服务器程序，却连接不上，为什么呢？具体代码如下

服务器程序：
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

import javax.swing.*;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.WindowConstants;

public class Text1 extends Thread
{
private Socket serversocket=null;
int i=0;
public Text1(Socket socket)
{
this.serversocket=socket;
}
public void run()
{

    try
    {

        final Socket socket=serversocket;
        final BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        final PrintWriter out = new PrintWriter(socket.getOutputStream());
        final BufferedReader sin=new BufferedReader(new  InputStreamReader(System.in));

        JFrame jf=new JFrame("这是服务器,正在与客户"+i+"对话");
        Container container=jf.getContentPane();
        jf.setVisible(true);   //设置窗体为可视
        jf.setLayout(null);  //窗体布局为网格
        jf.setSize(400,450);
        jf.setLocation(200,100 );
        jf.setBackground(Color.BLUE);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        JTextArea a=new JTextArea("");
        container.add(a);
        a.setBounds(0, 0, 385, 360);
        a.setBackground(Color.ORANGE);
        JTextField b=new JTextField("");
        container.add(b);
        b.setBounds(0,360, 385, 50);
        b.setBackground(Color.PINK);
        b.addActionListener(new ActionListener()
        {
    public void actionPerformed(ActionEvent e)
    {
        String s=b.getText();
        out.println(s);
        out.flush();
        a.append("\r\n");
        a.append("您自己：    "+s);
        if(s=="bye")
        {
            try
            {
                out.close();
                in.close();
                socket.close();
            }
            catch(Exception e1)
            {}
        }
    }
    });






        String str=null;

        while(str!="bye")
        {
            try
            {
                str=in.readLine();
            }
            catch(Exception e1)
            {}
            a.append("\r\n");
            a.append("来自客户:    "+str);
        }

         a.setText("对话结束！");
         try
            {
                in.close();
                out.close();
                socket.close();

            }
            catch(Exception e1)
            {}  
    }
    catch(Exception e)
    {}
    }

public static void main(String args[]) throws IOException
{
    ServerSocket server=null;
    boolean Listening=true;
    try
    {
        server=new ServerSocket(9999);
    }
    catch(IOException e)
    {}
    while(Listening)
    {
        new Text1(server.accept()).start();
    }





}

}
用户程序：
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.net.*;

import javax.swing.JFrame;

import javax.swing.*;
import javax.swing.WindowConstants;

public class MyClient extends JFrame{
public static void main (String args[]) throws IOException
{
Socket socket=new Socket("59.46.65.121",9999);
final PrintWriter out=new PrintWriter(socket.getOutputStream());
final BufferedReader in=new BufferedReader(new InputStreamReader (socket.getInputStream()));
final BufferedReader sin =new BufferedReader(new InputStreamReader (System.in));

    JFrame jf=new JFrame("这是用户02,正在与服务器对话");
    Container container=jf.getContentPane();
    jf.setVisible(true);   //设置窗体为可视
    jf.setLayout(null);  //窗体布局为网格
    jf.setSize(400,450);
    jf.setLocation(200,100 );
    jf.setBackground(Color.BLUE);
    jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    JTextArea a=new JTextArea("");
    container.add(a);
    a.setBounds(0, 0, 385, 360);
    a.setBackground(Color.ORANGE);
    JTextField b=new JTextField("");
    container.add(b);
    b.setBounds(0,360, 385, 50);
    b.setBackground(Color.PINK);
    b.addActionListener(new ActionListener()
            {
        public void actionPerformed(ActionEvent e)
        {
            String s=b.getText();
            out.println(s);
            out.flush();
            a.append("\r\n");
            a.append("您自己：    "+s);
            if(s=="bye")
            {
                try
                {
                    out.close();
                    in.close();
                    socket.close();
                }
                catch(Exception e1)
                {}
            }
        }
        });


   String str=null;

    while(str!="bye")
    {
        try
        {
            str=in.readLine();
        }
        catch(Exception e1)
        {}
        a.append("\r\n");
        a.append("来自服务器:    "+str);
    }

     a.setText("对话结束！");
     try
        {
            in.close();
            out.close();
            socket.close();

        }
        catch(Exception e1)
        {}  





}

}

你的服务端根本就没有用accept去接受客户端socket

不写注释 真的不是个好习惯