java中socket编程消息传递问题

[glzlaohuai]

服务器端代码：

import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.util.*;
public class Server extends JFrame
{
	private int port;	//端口号
	private JTextField jtf1=new JTextField();
	private JTextArea jta=new JTextArea();
	private JButton b=new JButton("建立");
	private LinkedList<ServerHander> clientList=new LinkedList<ServerHander>();
	private int num=0;
	public Server()
	{
		JPanel p1=new JPanel();
		p1.setLayout(new BorderLayout());
		p1.add(jtf1,BorderLayout.CENTER);
		p1.setBorder(new TitledBorder("端口号(0~65535)"));
		
		
		JPanel p2=new JPanel();
		p2.setLayout(new BorderLayout());
		p2.add(b,BorderLayout.CENTER);
		
		JPanel p3=new JPanel();
		p3.setLayout(new GridLayout(1,2));
		p3.add(p1);
		p3.add(p2);
		
		this.setLayout(new BorderLayout());
		this.add(p3,BorderLayout.NORTH);
		this.add(jta,BorderLayout.CENTER);
		
		//jta.setEditable(false);
		jtf1.setToolTipText("服务器将监听试图连接到此端口上的客户端");
		b.addActionListener(new ButtonAct());
	}
	public static void main(String args[])
	{
		Server frame=new Server();
		frame.setBounds(100,150,400,100);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setTitle("服务器端");
		frame.setVisible(true);
	}
	class ButtonAct implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			try
			{
				port=Integer.parseInt(jtf1.getText().trim());
				if((port>65535)||(port<0))
				{
					jta.append("请在一个适当的端口上启动服务器!"+"\n");
				}
				ServerSocket ss=new ServerSocket(port);
				jta.append("服务器成功启动于 :"+port);
				System.out.println("服务器成功启动于 :"+port);
				jta.append("\n"+new Date()+"\n");
				System.out.println(new Date());
				b.setEnabled(false);
				Socket s;
				String name;
				while(true)
				{
					s=ss.accept();
					num++;
					DataInputStream fromClient=new DataInputStream(s.getInputStream());
					name=fromClient.readUTF();
					System.out.println("有新的成员加入,ip: "+s.getInetAddress()+"昵称 :"+name+"  "+new Date());
					System.out.println("现有成员数"+num);
					jta.append("有新的成员加入,ip: "+s.getInetAddress()+" "+"昵称 :"+name+"\n");
					jta.append("现在的成员数:"+num);
					ServerHander sh=new ServerHander(name,s);
					sh.start();	
				}
			}
			catch(IOException ex)
			{
				ex.printStackTrace();
			}
		}
	}
	class ServerHander extends Thread
	{
		String name;
		Socket s;
		DataInputStream fromClient;
		DataOutputStream toClient;
		String msg;
		ServerHander(String name,Socket s)
		{
			this.name=name;
			this.s=s;
		}
		ServerHander()
		{
			;
		}
		public void run()
		{
			clientList.add(this);
			try
			{
				fromClient=new DataInputStream(s.getInputStream());
				toClient=new DataOutputStream(s.getOutputStream());
				sendAllClient(new Date()+" Server");
				sendAllClient(name+" 进入***************");
				while(true)
				{
					msg=fromClient.readUTF();
					sendAllClient(msg);
				}
			}
			catch(Exception ex)
			{
				clientList.remove(this);
				num--;
				System.out.println(name+"离开  "+new Date());
				sendAllClient(name+" 离开********************");
			}	
		}
		public void sendAllClient(String msg)	//给所有的客户端传送信息
		{
			Iterator i=clientList.iterator();
			ServerHander sh;
			while(i.hasNext())
			{
				sh=(ServerHander)i.next();
				try
				{
					sh.toClient.writeUTF(msg);
					sh.toClient.flush();
				}	
				catch(IOException ex)
				{
					ex.printStackTrace();
				}
			}		
		}		
	}
}

客户端代码：

import java.net.*;
import java.io.*;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class Client extends JFrame
{
	private JTextField jtf1=new JTextField();	//端口号
	private JTextField jtf2=new JTextField();	//ip地址
	private JTextField jtf3=new JTextField();	//昵称
	private JTextArea jta1=new JTextArea();
	private JTextArea jta2=new JTextArea();
	private JButton b=new JButton("登录");
	public Client()
	{
		JPanel p1=new JPanel();
		p1.setLayout(new BorderLayout());
		p1.add(jtf1,BorderLayout.CENTER);
		p1.setBorder(new TitledBorder("服务器的IP地址"));
		
		JPanel p2=new JPanel();
		p2.setLayout(new BorderLayout());
		p2.add(jtf2,BorderLayout.CENTER);
		p2.setBorder(new TitledBorder("服务器所监听的端口号"));
		
		
		JPanel p3=new JPanel();
		p3.setLayout(new BorderLayout());
		p3.add(jtf3,BorderLayout.CENTER);
		p3.setBorder(new TitledBorder("你的昵称"));
		
		
		JPanel p4=new JPanel();
		p4.setLayout(new GridLayout(1,3));
		p4.add(p1);
		p4.add(p2);
		p4.add(p3);
		
		
		JPanel p6=new JPanel();
		p6.add(b);
		
		
		jta1.setEditable(false);
		//jta1.setBackground(Color.green);
		//jta2.setBackground(Color.BLUE);
		//jta2.setForeground(Color.MAGENTA);
		
		
		JScrollPane jsp1=new JScrollPane(jta1);
		
		
		JScrollPane jsp2=new JScrollPane(jta2);
		
		
		JSplitPane jsp=new JSplitPane(JSplitPane.VERTICAL_SPLIT,jsp1,jsp2);
		jsp.setDividerLocation(300);
		jsp.setDividerSize(15);
		
		b.addActionListener(new ButtonAct());
		
		this.setLayout(new BorderLayout());
		this.add(p4,BorderLayout.NORTH);
		this.add(jsp,BorderLayout.CENTER);
		this.add(p6,BorderLayout.SOUTH);
	}
	public static void main(String args[])
	{
		Client frame=new Client();
		frame.setBounds(100,150,800,500);
		frame.setTitle("客户端");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}
	class ButtonAct implements ActionListener
	{
		DataInputStream fromServer;
		DataOutputStream toServer;
		String msg;
		public void actionPerformed(ActionEvent e)
		{
			int port;
			String ip;
			String name;
			ip=jtf1.getText().trim();
			port=Integer.parseInt(jtf2.getText().trim());
			name=jtf3.getText().trim();
			try
			{
				Socket s=new Socket(ip,port);
				b.setEnabled(false);
				fromServer=new DataInputStream(s.getInputStream());
				toServer=new DataOutputStream(s.getOutputStream());
				toServer.writeUTF(name);
				jta2.addKeyListener(new TextAct());
				while(true)
				{
					msg=fromServer.readUTF();
					jta1.append(msg+"\n");		
				}
			}
			catch(Exception ex)
			{
				jta1.append("错误的ip地址或者端口号，或者服务器未启动"+"\n");
				b.setEnabled(true);
			}
		}
		class TextAct extends KeyAdapter
		{
			public void keyPressed(KeyEvent e)
			{
				if(e.getKeyCode()==10)
				{
					try
					{
						toServer.writeUTF(jta2.getText());
					}
					catch(IOException ex)
					{
						ex.printStackTrace();
					}
					jta2.setText("");
				}		
			}
		}
	}
}

客户端只要点击登录按钮，就一直处于无反应状态~，哪位指点一下啊。

[designedIt]

客户端只要点击登录按钮，就一直处于无反应状态~。。。

肯定会“无反应状态”啊，你都在“登录按钮”中有一个
while(true)
{
msg=fromServer.readUTF();
jta1.append(msg+"\n");
}

了，当然会“无反应状态”。
办法：
将“登录按钮”中代码改造成一个线程。当单击“登录按钮”时，产生一个线程并启动它就行了。

[icekay Song]

read()方法是个阻塞方法,如果服务器不发数据你岂不是一直等下去...一般只监听发送,接收另起线程.

[bawgiitx]

private Thread thr;//加线程

public void actionPerformed(ActionEvent e)
        {
if(thr==null||!thr.isAlive(){

            int port;
            String ip;
            String name;
            ip=jtf1.getText().trim();
            port=Integer.parseInt(jtf2.getText().trim());
            name=jtf3.getText().trim();
            try
            {
                Socket s=new Socket(ip,port);
                b.setEnabled(false);
                fromServer=new DataInputStream(s.getInputStream());
                toServer=new DataOutputStream(s.getOutputStream());
                toServer.writeUTF(name);
                jta2.addKeyListener(new TextAct());
thr=new Thread(new Runnable(){
public void run(){
                while(true)
                {
                    msg=fromServer.readUTF();
                    jta1.append(msg+"\n");        
                }
}});
thr.start();
            }
            catch(Exception ex)
            {
                jta1.append("错误的ip地址或者端口号，或者服务器未启动"+"\n");
                b.setEnabled(true);
            }
        }
}