socket实例2

第二个实例创建一个java工程，基于tomcat服务器，程序运行时会启动客户端，实现了一个客户端向其他的客户端发送即时信息的功能

 MainWindow.java

package com.jikexueyuan.myjavachatclient.view;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.LayoutStyle.ComponentPlacement;
import javax.swing.border.EmptyBorder;

import com.jikexueyuan.myjavachatclient.main.ChatManager;

public class MainWIndow extends JFrame {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private JPanel contentPane;
    JTextArea txt;
    private JTextField ip;
    private JTextField send;



    /**
     * Create the frame.
     */
    public MainWIndow() {
        setAlwaysOnTop(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        
        txt = new JTextArea();
        txt.setText("Ready...");
        
        ip = new JTextField();
        ip.setText("127.0.0.1");
        ip.setColumns(10);
        
        JButton button = new JButton("连接到服务器");
        button.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent arg0) {
                ChatManager.getCM().connect(ip.getText());
            }
        });
        
        send = new JTextField();
        send.setText("你好");
        send.setColumns(10);
        
        JButton button_1 = new JButton("发送");
        button_1.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent arg0) {
                ChatManager.getCM().send(send.getText());
                appendText("我说："+send.getText());
                send.setText("");
            }
        });
        GroupLayout gl_contentPane = new GroupLayout(contentPane);
        gl_contentPane.setHorizontalGroup(
            gl_contentPane.createParallelGroup(Alignment.LEADING)
                .addGroup(Alignment.TRAILING, gl_contentPane.createSequentialGroup()
                    .addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
                        .addGroup(gl_contentPane.createSequentialGroup()
                            .addContainerGap()
                            .addComponent(txt, GroupLayout.DEFAULT_SIZE, 434, Short.MAX_VALUE))
                        .addGroup(gl_contentPane.createSequentialGroup()
                            .addContainerGap()
                            .addComponent(ip, GroupLayout.DEFAULT_SIZE, 306, Short.MAX_VALUE)
                            .addPreferredGap(ComponentPlacement.RELATED)
                            .addComponent(button))
                        .addGroup(gl_contentPane.createSequentialGroup()
                            .addComponent(send, GroupLayout.DEFAULT_SIZE, 272, Short.MAX_VALUE)
                            .addPreferredGap(ComponentPlacement.RELATED)
                            .addComponent(button_1, GroupLayout.PREFERRED_SIZE, 162, GroupLayout.PREFERRED_SIZE)))
                    .addContainerGap())
        );
        gl_contentPane.setVerticalGroup(
            gl_contentPane.createParallelGroup(Alignment.LEADING)
                .addGroup(gl_contentPane.createSequentialGroup()
                    .addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
                        .addComponent(ip, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                        .addComponent(button))
                    .addPreferredGap(ComponentPlacement.RELATED)
                    .addComponent(txt, GroupLayout.DEFAULT_SIZE, 196, Short.MAX_VALUE)
                    .addPreferredGap(ComponentPlacement.RELATED)
                    .addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
                        .addComponent(send, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                        .addComponent(button_1)))
        );
        contentPane.setLayout(gl_contentPane);
    }

    
    public void appendText(String in) {
        txt.append("
"+in);
    }
}

StartClient.java

package com.jikexueyuan.myjavachatclient.main;

import java.awt.EventQueue;

import com.jikexueyuan.myjavachatclient.view.MainWIndow;

public class StartClient {

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    MainWIndow frame = new MainWIndow();
                    frame.setVisible(true);
                    ChatManager.getCM().setWindow(frame);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

}

ChatManager.java

package com.jikexueyuan.myjavachatclient.main;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

import com.jikexueyuan.myjavachatclient.view.MainWIndow;


public class ChatManager {

    private ChatManager(){}
    private static final ChatManager instance = new ChatManager();
    public static ChatManager getCM() {
        return instance;
    }
    
    MainWIndow window;
    String IP;
    Socket socket;
    BufferedReader reader;
    PrintWriter writer;
    
    public void setWindow(MainWIndow window) {
        this.window = window;
        window.appendText("文本框已经和ChatManager绑定了。");
    }
    
    public void connect(String ip) {
        this.IP = ip;
        new Thread(){

            @Override
            public void run() {
                try {
                    socket = new Socket(IP, 12345);
                    writer = new PrintWriter(
                            new OutputStreamWriter(
                                    socket.getOutputStream()));
                    
                    reader = new BufferedReader(
                            new InputStreamReader(
                                    socket.getInputStream()));
                    String line;
                    while ((line = reader.readLine()) != null) {
                        window.appendText("收到："+line);
                    }
                    writer.close();
                    reader.close();
                    writer = null;
                    reader = null;
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }
    
    public void send(String out) {
        if (writer != null) {
            writer.write(out+"
");
            writer.flush();
        }else {
            window.appendText("当前的链接已经中断");
        }
    }
}

将工程运行起来，这里我启动2个客户端

实现了即时通信