用java编写qq聊天程序

下面是一个简单的使用Java编写的QQ聊天程序的代码示例：

import java.io.*;import java.net.*;public class QQChatClient {private Socket socket;private BufferedReader reader;private PrintWriter writer;public QQChatClient(String host, int port) {try {// 连接服务器socket = new Socket(host, port);System.out.println("成功连接到服务器");// 创建输入输出流reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));writer = new PrintWriter(socket.getOutputStream(), true);// 启动接收消息线程new Thread(new MessageReceiver()).start();// 读取用户输入并发送消息BufferedReader userInputReader = new BufferedReader(new InputStreamReader(System.in));String userInput;while ((userInput = userInputReader.readLine()) != null) {writer.println(userInput);}} catch (IOException e) {e.printStackTrace();} finally {try {if (socket != null) {socket.close();}if (reader != null) {reader.close();}if (writer != null) {writer.close();}} catch (IOException e) {e.printStackTrace();}}}public static void main(String[] args) {QQChatClient chatClient = new QQChatClient("localhost", 8888);}class MessageReceiver implements Runnable {@Overridepublic void run() {try {String message;while ((message = reader.readLine()) != null) {System.out.println("收到消息：" + message);}} catch (IOException e) {e.printStackTrace();}}}}

该程序使用Socket连接到指定的服务器和端口，然后创建输入输出流进行消息的发送和接收。在主线程中，通过读取用户的输入并发送到服务器。另外，在单独的线程中，通过不断地读取输入流来接收服务器发送的消息，并在控制台进行输出。