网络Socket编程，在线急等解决，谢谢!

Question

可以发送消息  但是接收不到消息，哪位知道的指点下，谢谢！！！服务器端：Server.java
import java.awt.Container;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JButton;
import javax.swing.JPanel;
import java.net.Socket;
import java.net.ServerSocket;
import java.io.BufferedReader;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.InputStreamReader;public class Server extends JFrame implements ActionListener{

JTextArea outputArea;
JTextArea inputArea;
JButton send;
JButton cancel;
JPanel panel;
private ServerSocket ss;
private Socket socket;
private BufferedReader in;
private PrintWriter out;

public Server(){
super("Server");
outputArea=new JTextArea(10,5);
inputArea=new JTextArea(10,5);
outputArea.setBackground(Color.LIGHT_GRAY);
outputArea.setEditable(false);
inputArea.setBackground(Color.GRAY);
send=new JButton("send");
cancel=new JButton("cancel");
panel=new JPanel();
panel.add(send);
panel.add(cancel);
Container cp=getContentPane();
cp.add(outputArea,BorderLayout.NORTH);
cp.add(inputArea,BorderLayout.CENTER);
cp.add(panel,BorderLayout.SOUTH);
setSize(500,400);
setVisible(true);
setResizable(false);

send.addActionListener(this);
cancel.addActionListener(this);

try{
ss=new ServerSocket(4000);
socket=ss.accept();
in=new BufferedReader(new InputStreamReader(socket.getInputStream()));
out=new PrintWriter(socket.getOutputStream());
outputArea.append("Client says:"+in.readLine());
}catch(IOException e){}
}

public void actionPerformed(ActionEvent e){ if(e.getActionCommand()=="cancel"){
inputArea.setText(" ");
}
if(e.getActionCommand()=="send"){
try{
outputArea.append("Server says"+inputArea.getText()+"\n");
inputArea.setText(" ");
out.write(inputArea.getText());
}catch(Exception e1){}

}
}

public static void main(String []args){
new Server();
}
}客户端：Client.javaimport java.awt.Container;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JButton;
import javax.swing.JPanel;
import java.net.Socket;
import java.net.InetAddress;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.PrintWriter;
import java.io.InputStreamReader;public class Client extends JFrame implements ActionListener{

JTextArea outputArea;
JTextArea inputArea;
JButton send;
JButton cancel;
JPanel panel;
private Socket socket;
private BufferedReader in;
private PrintWriter out;

public Client(){
super("Client");
outputArea=new JTextArea(10,5);
inputArea=new JTextArea(10,5);
outputArea.setBackground(Color.LIGHT_GRAY);
outputArea.setEditable(false);
inputArea.setBackground(Color.GRAY);
send=new JButton("send");
cancel=new JButton("cancel");
panel=new JPanel();
panel.add(send);
panel.add(cancel);
Container cp=getContentPane();
cp.add(outputArea,BorderLayout.NORTH);
cp.add(inputArea,BorderLayout.CENTER);
cp.add(panel,BorderLayout.SOUTH);
setSize(500,400);
setVisible(true);
setResizable(false);

send.addActionListener(this);
cancel.addActionListener(this);
try{
    socket=new Socket(InetAddress.getLocalHost(),4000);
    in=new BufferedReader(new InputStreamReader(socket.getInputStream()));
    out=new PrintWriter(socket.getOutputStream());
    outputArea.append("Server says:"+in.readLine());
}catch(IOException e){}

}

public void actionPerformed(ActionEvent e){ if(e.getActionCommand()=="cancel"){
inputArea.setText(" ");
}
if(e.getActionCommand()=="send"){
outputArea.append("Client says:"+inputArea.getText()+"\n");
inputArea.setText(" ");
out.write(inputArea.getText());
}
}

public static void main(String []args){
new Client();
}
}

Answer 1

要保证接受消息
应该另外启动一条线程不断轮询in.readLine()

Answer 2

你服务器端就接受了一次客户端的信息while(true){
  in.readLine()
}  在不另起轮询线程的时候这样也可以
但是不推荐 这样太没意思  实现以后就是  客户端说一句  服务器端说一句  顶楼上的做法

Answer 3

要想互相监听接收消息， 两边都要建 服务端 accept（）；例如，每端建两个线程。希望对你有帮助。