java网络编程，通过TCP,Socket实现多对一的局域网聊天室
可以实现多个客户端连接服务器，服务器接收到信息就会把信息广播到所有的客户端
这是服务器端的代码
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import java.awt.BorderLayout;import java.awt.FlowLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import .Socket;import java.util.List;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;/*这个类是服务器端的UI*/public class ServerUI extends JFrame {public static void main(String[] args) {ServerUI serverUI = new ServerUI();}public JButton btStart;//启动服务器public JButton btSend;//发送信息按钮public JTextField tfSend;//需要发送的文本信息public JTextArea taShow;//信息展示public Server server;//用来监听客户端连接static List<Socket> clients;//保存连接到服务器的客户端public ServerUI() {super("服务器端");btStart = new JButton("启动服务");btSend = new JButton("发送信息");tfSend = new JTextField(10);taShow = new JTextArea();btStart.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {server = new Server(ServerUI.this);}});btSend.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {server.sendMsg(tfSend.getText());tfSend.setText("");}});this.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {int a = JOptionPane.showConfirmDialog(null, "确定关闭吗？", "温馨提示",JOptionPane.YES_NO_OPTION);if (a == 1) {server.closeServer();System.exit(0); // 关闭}}});JPanel top = new JPanel(new FlowLayout());top.add(tfSend);top.add(btSend);top.add(btStart);this.add(top, BorderLayout.SOUTH);final JScrollPane sp = new JScrollPane();sp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);sp.setViewportView(this.taShow);this.taShow.setEditable(false);this.add(sp, BorderLayout.CENTER);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.setSize(400, 300);this.setLocation(100, 200);this.setVisible(true);}}
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import java.io.BufferedReader;import java.io.IOException;import java.io.PrintWriter;import .ServerSocket;import .Socket;import java.util.ArrayList;/*这个类是服务器端的等待客户端连接*/public class Server extends Thread {ServerUI ui;ServerSocket ss;BufferedReader reader;PrintWriter writer;public Server(ServerUI ui) {this.ui = ui;this.start();}public void run() {try {ss = new ServerSocket(1228);ui.clients=new ArrayList<Socket>();println("启动服务器成功：端口1228");while (true) {println("等待客户端");Socket client = ss.accept();ui.clients.add(client);println("连接成功" + client.toString());new ListenerClient(ui, client);}} catch (IOException e) {println("启动服务器失败：端口1228");println(e.toString());e.printStackTrace();}}public synchronized void sendMsg(String msg) {try {for (int i = 0; i < ui.clients.size(); i++) {Socket client = ui.clients.get(i);writer = new PrintWriter(client.getOutputStream(), true);writer.println(msg);}} catch (Exception e) {println(e.toString());}}public void println(String s) {if (s != null) {this.ui.taShow.setText(this.ui.taShow.getText() + s + "\n");System.out.println(s + "\n");}}public void closeServer() {try {if (ss != null)ss.close();if (reader != null)reader.close();if (writer != null)writer.close();} catch (IOException e) {// TODO Auto-generated catch block e.printStackTrace();}}}
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import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import .Socket;/*这个类是服务器端的等待客户端发送信息*/public class ListenerClient extends Thread {BufferedReader reader;PrintWriter writer;ServerUI ui;Socket client;public ListenerClient(ServerUI ui, Socket client) {this.ui = ui;this.client=client;this.start();}//为每一个客户端创建线程等待接收信息，然后把信息广播出去public void run() {String msg = "";while (true) {try {reader = new BufferedReader(new InputStreamReader(client.getInputStream()));writer = new PrintWriter(client.getOutputStream(), true);msg = reader.readLine();sendMsg(msg);} catch (IOException e) {println(e.toString());// e.printStackTrace();break;}if (msg != null && msg.trim() != "") {println(">>" + msg);}}}//把信息广播到所有用户public synchronized void sendMsg(String msg) {try {for (int i = 0; i < ui.clients.size(); i++) {Socket client = ui.clients.get(i);writer = new PrintWriter(client.getOutputStream(), true);writer.println(msg);}} catch (Exception e) {println(e.toString());}}public void println(String s) {if (s != null) {this.ui.taShow.setText(this.ui.taShow.getText() + s + "\n");System.out.println(s + "\n");}}}
客户端代码
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import java.awt.BorderLayout;import java.awt.FlowLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;public class ClientUI extends JFrame {public static void main(String[] args) {ClientUI client = new ClientUI();}public ClientUI() {super("客户端");btStart = new JButton("启动连接");btSend = new JButton("发送信息");tfSend = new JTextField(10);tfIP = new JTextField(10);tfPost = new JTextField(5);taShow = new JTextArea();btStart.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {server = new ClientThread(ClientUI.this);}});btSend.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {server.sendMsg(tfSend.getText());tfSend.setText("");}});this.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {int a = JOptionPane.showConfirmDialog(null, "确定关闭吗？", "温馨提示",JOptionPane.YES_NO_OPTION);if (a == 1) {System.exit(0); // 关闭}}});JPanel top = new JPanel(new FlowLayout());top.add(tfSend);top.add(btSend);top.add(btStart);this.add(top, BorderLayout.SOUTH);final JScrollPane sp = new JScrollPane();sp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);sp.setViewportView(this.taShow);this.taShow.setEditable(false);this.add(sp, BorderLayout.CENTER);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.setSize(400, 300);this.setLocation(600, 200);this.setVisible(true);}publicJButton btStart;publicJButton btSend;publicJTextField tfSend;publicJTextField tfIP;publicJTextField tfPost;publicJTextArea taShow;publicClientThread server;}
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import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import .Socket;public class ClientThread extends Thread {ClientUI ui;Socket client;BufferedReader reader;PrintWriter writer;public ClientThread(ClientUI ui) {this.ui = ui;try {client = new Socket("127.0.0.1", 1228);//这里设置连接服务器端的IP的端口println("连接服务器成功：端口1228");reader = new BufferedReader(new InputStreamReader(client.getInputStream()));writer = new PrintWriter(client.getOutputStream(), true);// 如果为 true，则 println、printf 或 format 方法将刷新输出缓冲区} catch (IOException e) {println("连接服务器失败：端口1228");println(e.toString());e.printStackTrace();}this.start();}public void run() {String msg = "";while (true) {try {msg = reader.readLine();} catch (IOException e) {println("服务器断开连接");break;}if (msg != null && msg.trim() != "") {println(">>" + msg);}}}public void sendMsg(String msg) {try {writer.println(msg);} catch (Exception e) {println(e.toString());}}public void println(String s) {if (s != null) {this.ui.taShow.setText(this.ui.taShow.getText() + s + "\n");System.out.println(s + "\n");}}}
