java socket实现聊天室 java实现多人聊天功能

用java socket做一个聊天室，实现多人聊天的功能。看了极客学院的视频后跟着敲的。(1DAY)

服务端：

1. 先写服务端的类MyServerSocket，里面放一个监听线程，一启动就好
2. 实现服务端监听类ServerListener.java，用accept来监听，一旦有客户端连上，生成新的socket，就新建个线程实例ChatSocket。启动线程后就把线程交给ChatManager管理
3. 在ChatSocket中实现从客户端读取内容，把读取到的内容发给集合内所有的客户端
4. ChatManager里面用vector来管理socket线程实例ChatSocket，并实现发送信息给其他的客户端

客户端：

1. 新建一个继承JFrame的MainWindow.java类，主要实现聊天窗口的UI，以及事件响应。
2. 新建StartClient.java类，把MainWindow中生成MainWindow主方法部分代码拷贝过来，这样就能在主程序中把窗体执行出来了。
3. 新建ChatManager（需要单例化的类）管理socket，实现聊天的输入输出功能。最后记得在1中新建窗口后，传一份frame的引用到ChatManager中，才能实现ChatManager对界面的显示。

工程结构如图

以下为代码

服务端：

1. 先写服务端的类MyServerSocket，里面放一个监听线程，一启动就好

package com.starnet.testserversocket.main;

public class MyServerSocket {
  public static void main(String[] args) {
    new ServerListener().start();
  }
}

2.实现服务端监听类ServerListener.java，用accept来监听，一旦有客户端连上，生成新的socket，就新建个线程实例ChatSocket。启动线程后就把线程交给ChatManager管理

package com.starnet.testserversocket.main;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

import javax.swing.JOptionPane;

public class ServerListener extends Thread {
  public void run() {
    try {
      ServerSocket serverSocket = new ServerSocket(23456);
      while (true) {
        // block
        Socket socket = serverSocket.accept();
        // 建立链接
        JOptionPane.showMessageDialog(null, "有客户端连到本机23456端口");
        //将socket传递给新的线程
        ChatSocket cs= new ChatSocket(socket);
        cs.start();
        ChatManager.getChatManager().add(cs);
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

3.在ChatSocket中实现从客户端读取内容，把读取到的内容发给集合内所有的客户端

package com.starnet.testserversocket.main;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.Socket;
/*每一个连上的客户端，服务器都有一个线程为之服务*/
public class ChatSocket extends Thread {
  Socket socket;

  public ChatSocket(Socket s) {
    this.socket = s;
  }

  //发送数据
  public void out(String out) {
    try {
      socket.getOutputStream().write(out.getBytes("UTF-8"));
    } catch (UnsupportedEncodingException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }

  //服务器会不断地从客户端读取内容，把读取到的内容发给集合内所有的客户端。
  public void run() {
    try {
      //接收数据
      BufferedReader br = new BufferedReader(
          new InputStreamReader(
              socket.getInputStream(), "UTF-8"));
      String line=null;
      //发送读到的内容
      while ((line = br.readLine())!=null) {
        System.out.println(line);
        ChatManager.getChatManager().publish(this, line);
      }
      br.close();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
}

4.ChatManager里面用vector来管理socket线程实例ChatSocket，并实现发送信息给其他的客户端

package com.starnet.testserversocket.main;

import java.util.Vector;
//一个聊天服务器只能有一个manager，要单例化处理
public class ChatManager {
  private ChatManager(){}
  private static final ChatManager CM=new ChatManager();
  public static ChatManager getChatManager(){
    return CM;
  }

  Vector<ChatSocket> vector = new Vector<ChatSocket>();
  /*增加ChatSocket 实例到vector中*/
  public void add(ChatSocket cs){
    vector.add(cs);
  }

  /*发布消息给其他客户端
   *ChatSocket cs： 调用publish的线程
   *msg：要发送的信息 */
  public void publish(ChatSocket cs, String msg){
    for (int i = 0; i < vector.size(); i++) {
      ChatSocket csTemp = vector.get(i);
      if (!cs.equals(csTemp)) {
        csTemp.out(msg+"\n");//不用发送给自己。
      }
    }
  }

}

客户端：

1. 新建一个继承JFrame的MainWindow.java类，主要实现聊天窗口的UI，以及事件响应。

package com.starnet.javaclient.view;

import java.awt.BorderLayout;
import java.awt.EventQueue;

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

import com.starnet.javaclient.main.ChatManager;
import com.sun.xml.internal.ws.client.SenderException;

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

public class MainWindow extends JFrame {

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

  /**
   * 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...");

    txtip = new JTextField();
    txtip.setText("127.0.0.1");
    txtip.setColumns(10);

    JButton btnConnect = new JButton("connect");
    btnConnect.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseClicked(MouseEvent e) {
        ChatManager.getChatManager().connect(txtip.getText());
      }
    });

    txtSend = new JTextField();
    txtSend.setText("hello");
    txtSend.setColumns(10);

    JButton btnSend = new JButton("send");
    btnSend.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseClicked(MouseEvent e) {
        ChatManager.getChatManager().send(txtSend.getText());
        appendText("我说: "+txtSend.getText());
        txtSend.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()
              .addComponent(txtSend, GroupLayout.DEFAULT_SIZE, 325, Short.MAX_VALUE)
              .addPreferredGap(ComponentPlacement.RELATED)
              .addComponent(btnSend, GroupLayout.PREFERRED_SIZE, 109, GroupLayout.PREFERRED_SIZE))
            .addGroup(Alignment.LEADING, gl_contentPane.createSequentialGroup()
              .addComponent(txtip, GroupLayout.PREFERRED_SIZE, 294, GroupLayout.PREFERRED_SIZE)
              .addPreferredGap(ComponentPlacement.RELATED)
              .addComponent(btnConnect, GroupLayout.DEFAULT_SIZE, 140, Short.MAX_VALUE))
            .addComponent(txt, GroupLayout.DEFAULT_SIZE, 434, Short.MAX_VALUE))
          .addContainerGap())
    );
    gl_contentPane.setVerticalGroup(
      gl_contentPane.createParallelGroup(Alignment.LEADING)
        .addGroup(gl_contentPane.createSequentialGroup()
          .addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
            .addComponent(txtip, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
            .addComponent(btnConnect))
          .addPreferredGap(ComponentPlacement.RELATED)
          .addComponent(txt, GroupLayout.DEFAULT_SIZE, 198, Short.MAX_VALUE)
          .addPreferredGap(ComponentPlacement.RELATED)
          .addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
            .addComponent(btnSend)
            .addComponent(txtSend, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)))
    );
    contentPane.setLayout(gl_contentPane);
  }
  /*客户端发送的内容添加到中间的txt控件中*/
  public void appendText(String in) {
    txt.append("\n" + in);
  }
}

2.新建StartClient.java类，把MainWindow中生成MainWindow主方法部分代码拷贝过来，这样就能在主程序中把窗体执行出来了。

package com.starnet.javaclient.main;

import java.awt.EventQueue;

import com.starnet.javaclient.view.MainWindow;

public class StartClient {
  public static void main(String[] args) {
    /*先新建一个jframe，然后把自动生成的代码贴过来*/
    EventQueue.invokeLater(new Runnable() {
      public void run() {
        try {
          MainWindow frame = new MainWindow();
          frame.setVisible(true);
          //创建完这个frame以后，传一份window的引用到ChatManager去
          ChatManager.getChatManager().setWindow(frame);
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    });
  }
}

3.新建ChatManager（需要单例化的类）管理socket，实现聊天的输入输出功能。最后记得在1中新建窗口后，传一份frame的引用到ChatManager中，才能实现ChatManager对界面的显示。

package com.starnet.javaclient.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.starnet.javaclient.view.MainWindow;

public class ChatManager {
  private ChatManager(){}
  private static final ChatManager instance=new ChatManager();
  public static ChatManager getChatManager(){
    return instance;
  }
  MainWindow window;//为了能在界面上显示服务器发来的信息，就需要传一个MainWindow的引用进来
  Socket socket;
  private String IP;
  BufferedReader bReader;
  PrintWriter pWriter;
  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() {
        //实现网络方法
        try {
          socket = new Socket(IP, 23456);
          //输出流
          pWriter = new PrintWriter(
              new OutputStreamWriter(
                  socket.getOutputStream()));
          //输入流
          bReader = new BufferedReader(
              new InputStreamReader(
                  socket.getInputStream()));

          String line = null;
          //如果读取数据为空
          while ((line = bReader.readLine())!=null) {
            window.appendText("收到： "+line);
          }
          //读完数据之后要关闭
          pWriter.close();
          bReader.close();
          pWriter = null;
          bReader = null;

        } catch (UnknownHostException e) {
          e.printStackTrace();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }.start();
  }

  public void send(String sendMsg){
    if (pWriter!=null) {
      pWriter.write(sendMsg+"\n");
      pWriter.flush();
    } else {
      window.appendText("当前链接已经中断...");
    }
  }
}

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