java一对一聊天程序，客户端发的消息无法在服务端显示 我用的是eclipse
服务端：
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import java.net.*;
public class L_serve implements ActionListener
{
JTextArea said;
JTextField chat;
JButton send;
public L_serve()
{
JFrame f=new JFrame("JAVA QQ服务端");
f.setLayout(null);
f.setSize(450,400);
said=new JTextArea();
said.setBounds(0,0,450,200);
chat=new JTextField(20);
chat.setBounds(0,210,450,100);
chat.addActionListener(this);
send=new JButton("发送");
send.setBounds(100,320,70,20);
send.addActionListener(this);
f.add(chat);
f.add(said);
f.add(send);
f.setVisible(true);
}
public void listenClient() throws IOException
{
try{
ServerSocket server=null;
try{
server=new ServerSocket(7641);//创建一个ServerSocket在端口4700监听客户请求
}catch(Exception e) {
System.out.println("can not listen t"+e); //在屏幕上显示出错信息
said.append("duankou"+e);
}
Socket socket=null;
try{
socket=server.accept();//使用accept()阻塞等待客户请求，有客户
//请求到来则产生一个Socket对象，并继续执行
}catch(Exception e) {
System.out.println("Error."+e);
said.append("ERROR."+e);
}
String line;
BufferedReader in=new BufferedReader(new InputStreamReader(
socket.getInputStream()));
//由Socket对象得到输入流，并构造相应的BufferedReader对象
PrintWriter out=new PrintWriter(socket.getOutputStream());
//由Socket对象得到输出流，并构造PrintWriter对象
BufferedReader sin=new BufferedReader(new InputStreamReader(System.in));
//由系统标准输入设备构造BufferedReader对象
System.out.println("Client:"+in.readLine());//在标准输出上打印从客户端读入的字符串
said.append("Client:"+in.readLine());
line=sin.readLine(); //从标准输入读入一字符串
while(!line.equals("bye")){ //如果该字符串为 "bye"，则停止循环
out.println(line); //向客户端输出该字符串
out.flush(); //刷新输出流，使Client马上收到该字符串
System.out.println("Server:"+line); //在屏幕上显示读入的字符串
said.append("Server:"+line);
System.out.println("Client:"+in.readLine());//从Client读入一字符串，并打印到标准输出上
said.append("Client:"+in.readLine());
line=sin.readLine(); //从系统标准输入读入一字符串
} //继续循环
out.close(); //关闭Socket输出流
in.close(); //关闭Socket输入流
socket.close(); //关闭Socket
server.close(); //关闭ServerSocket
}catch(Exception e){
System.out.println("Error:"+e);
}
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==send){
String str=chat.getText();
said.append("server:"+str+'\n');}
chat.setText(null);
}
public static void main(String args[]) throws IOException
{
L_serve s=new L_serve();
s.listenClient();
}
}
客户端：
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
public class L_client implements ActionListener
{
JTextArea said;
JTextField chat;
JButton send；
public L_client()
{
JFrame f=new JFrame("JAVA QQ客户端");
f.setLayout(null);
f.setSize(450,400);
said=new JTextArea();
said.setBounds(0,0,450,200);
chat=new JTextField(20);
chat.setBounds(0,210,450,100);
chat.addActionListener(this);
send=new JButton("发送");
send.setBounds(100,320,70,20);
send.addActionListener(this);
f.add(chat);
f.add(said);
f.add(send);
f.setVisible(true);
}
public void startNet() throws IOException
{
try{
Socket socket=new Socket("127.0.0.1",7641);
BufferedReader sin=new BufferedReader(new InputStreamReader(System.in));
//由系统标准输入设备构造BufferedReader对象
PrintWriter out=new PrintWriter(socket.getOutputStream());
//由Socket对象得到输出流，并构造PrintWriter对象
BufferedReader in=new BufferedReader(new InputStreamReader(socket.getInputStream()));
//由Socket对象得到输入流，并构造相应的BufferedReader对象
String readline;
readline=sin.readLine(); //从系统标准输入读入一字符串
while(!readline.equals("bye")){ //若从标准输入读入的字符串为“bye”则停止循环
out.println(readline); //将从系统标准输入读入的字符串输出到Server
out.flush(); //刷新输出流，使Server马上收到该字符串
System.out.println("Client:"+readline); //在系统标准输出上打印读入的字符串
said.append("Client:"+readline);
System.out.println("Server:"+in.readLine());
said.append("Server:"+in.readLine());
//从Server读入一字符串，并打印到标准输出上
readline=sin.readLine(); //从系统标准输入读入一字符串
} //继续循环
out.close(); //关闭Socket输出流
in.close(); //关闭Socket输入流
socket.close(); //关闭Socket
}catch(Exception e) {
System.out.println("Error"+e); //出错，则打印出错信息
said.append("Error"+e);
}
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==send){
String str=chat.getText();
said.append("client: "+str+'\n');}
chat.setText(null);
}
public static void main(String args[]) throws IOException
{
L_client c=new L_client();
c.startNet();
}
}
[解决办法]
检查一下连接是否建立
[解决办法]
System.out.println("Client:"+in.readLine());//从Client读入一字符串，并打印到标准输出上
said.append("Client:"+in.readLine());//服务端会阻塞在这里
line=sin.readLine(); //从系统标准输入读入一字符串,这里又是一个阻塞，循环会一直停在这里等待你从屏幕输入字符，后面的都不会执行
改成
String temp = in.readLine();
System.out.println("Client:"+temp);
said.append("Client:"+temp);
程序里面有很多地方都发生了阻塞
