java实现TCP通信（带界面）

服务端：

package NetWork;

import java.io.*;
import java.net.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

public class Server implements ActionListener, Runnable {
JTextArea showArea;
JTextField msgText;
JFrame mainJframe;
JButton sentBtn;
JScrollPane JSPane;
JPanel pane;
Container con;
Thread thread = null;
ServerSocket serverSocket;
Socket connectToClient;
DataInputStream inFromClient;
DataOutputStream outToClient;

public Server() {
// 设置界面
mainJframe = new JFrame("TCP聊天服务端");
con = mainJframe.getContentPane();
showArea = new JTextArea();
showArea.setEditable(false);
showArea.setLineWrap(true);
JSPane = new JScrollPane(showArea);
msgText = new JTextField();
msgText.setColumns(30);
msgText.addActionListener(this);
sentBtn = new JButton("发送");
sentBtn.addActionListener(this);
pane = new JPanel();
pane.setLayout(new FlowLayout());
pane.add(msgText);
pane.add(sentBtn);
con.add(JSPane, BorderLayout.CENTER);
con.add(pane, BorderLayout.SOUTH);
mainJframe.setLocation(300, 200);
mainJframe.setSize(500, 350);
mainJframe.setVisible(true);
mainJframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
;
try {
// 创建服务套接字
serverSocket = new ServerSocket(5500);
showArea.append("正在等待对话请求...\n");
// 侦听客户端的连接
connectToClient = serverSocket.accept();
inFromClient = new DataInputStream(connectToClient.getInputStream());
outToClient = new DataOutputStream(connectToClient.getOutputStream());
// 启动线程在后台来接收对方的消息
thread = new Thread(this);
thread.setPriority(Thread.MIN_PRIORITY);
thread.start();
} catch (IOException e) {
showArea.append("对不起，不能创建服务器\n");
msgText.setEditable(false);
sentBtn.setEnabled(false);
}
}

public static void main(String[] args) {
new Server();
}

@Override // 响应按钮事件，发送消息给对方
public void actionPerformed(ActionEvent e) {
String s = msgText.getText();
if (s.length() > 0) {
try {
outToClient.writeUTF(s);
outToClient.flush();
showArea.append("我 ：" + msgText.getText() + "\n");
msgText.setText(null);
} catch (IOException el) {
showArea.append("你的消息：“" + msgText.getText() + "”未能发出去!\n");
}
}
}

@Override
// 本线程负责将客户机传来的信息显示在对话区域
public void run() {
try {
while (true) {
showArea.append("客户端：" + inFromClient.readUTF() + "\n");
Thread.sleep(1000);
}
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

客户端：

package NetWork;

import java.io.*;
import java.net.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

public class Client implements ActionListener, Runnable {
JTextArea showArea;
JTextField msgText;
JFrame mainJframe;
JButton sentBtn;
JScrollPane JSPane;
JPanel pane;
Container con;
Thread thread = null;
Socket connectToServer;
DataInputStream inFromServer;
DataOutputStream outToServer;

public Client() {
mainJframe = new JFrame("TCP聊天客户端");
con = mainJframe.getContentPane();
showArea = new JTextArea();
showArea.setEditable(false);
showArea.setLineWrap(true);
JSPane = new JScrollPane(showArea);
msgText = new JTextField();
msgText.setColumns(30);
msgText.addActionListener(this);
sentBtn = new JButton("发送");
sentBtn.addActionListener(this);
pane = new JPanel();
pane.setLayout(new FlowLayout());
pane.add(msgText);
pane.add(sentBtn);
con.add(JSPane, BorderLayout.CENTER);
con.add(pane, BorderLayout.SOUTH);
mainJframe.setLocation(700, 200);
mainJframe.setSize(500, 350);
mainJframe.setVisible(true);
mainJframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// 创建套接字连接到服务器
try {
connectToServer = new Socket("localhost", 5500); // 本地IP
inFromServer = new DataInputStream(connectToServer.getInputStream());
outToServer = new DataOutputStream(connectToServer.getOutputStream());
showArea.append("连接成功，请说话...\n");
// 创建线程在后台处理对方的消息
thread = new Thread(this);
thread.setPriority(Thread.MIN_PRIORITY);
thread.start();
} catch (UnknownHostException e1) {
e1.printStackTrace();
} catch (IOException e1) {
showArea.append("抱歉，未能连接到服务器！\n");
msgText.setEditable(false);
sentBtn.setEnabled(false);
}
}

public static void main(String[] args) {
new Client();
}

@Override //
public void actionPerformed(ActionEvent e) {
String s = msgText.getText();
if (s.length() > 0) {
try {
outToServer.writeUTF(s);
outToServer.flush();
showArea.append("我 ： " + msgText.getText() + "\n");
msgText.setText(null);
} catch (IOException e1) {
showArea.append("你的消息：“" + msgText.getText() + "”未能发送出去！\n");
}
}
}

// 本线程负责将服务器传来的消息显示在对话区域
public void run() {
try {
while (true) {
showArea.append("服务端 ：" + inFromServer.readUTF() + "\n");
Thread.sleep(1000);
}
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

结果展示：