Java网络编程实现多客户端连接服务器

使用多线程实现多客户端连接服务器，

客户端代码如下：

/**
 * Socket客户端
 * 功能为：发送字符串nihao到服务器端，并打印出服务器端的返回信息
 */
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class SocketClient {

	public static void main(String[] args) {
		Socket socket = null;
		InputStream is = null;
		OutputStream os = null;
		// 服务器IP
		String serverIP = "127.0.0.1";
		// 服务器端口
		int port = 8080;
		try {
			// 建立连接
			socket = new Socket(serverIP, port);
			is = socket.getInputStream();
			os = socket.getOutputStream();
			//发送信息
			os.write("nihao".getBytes());
			//接收信息
			byte[] buffer = new byte[1024]; 
			int n = is.read(buffer);
			// 输出返回信息
			System.out.println("接收服务器信息：" + new String(buffer, 0, n));
		} catch (Exception e) {
			e.printStackTrace(); 
		} finally {
			try {
				//关闭流和连接
				is.close();
				os.close();
				socket.close();
			} catch (Exception e2) {
			}
		}
	}
}

服务器端代码如下：

 

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
 
public class SocketServer {

	public class ClientHandler implements Runnable {
 
		Socket socket = null;
		InputStream inputStream = null;
		OutputStream outputStream = null;

		public ClientHandler(Socket socket) {
			this.socket = socket; 
		}

		public void run() {
			byte[] buffer = new byte[1024];
			//读取数据
            int length;
			try {
				inputStream = socket.getInputStream();
				outputStream = socket.getOutputStream();
				length = inputStream.read(buffer); 
	            System.out.println(new String(buffer,0,length)); 
	            outputStream.write("niyehao".getBytes());
			} catch (IOException e) {
 				e.printStackTrace(); 
			}finally{
				try {
					inputStream.close();
					outputStream.close();
					socket.close();
				} catch (IOException e) { 
 					e.printStackTrace();
				}
			}
		} 
	}
	
	public static void main(String[] args){
		new SocketServer().StartServer();  
 
	}
	
	public void StartServer(){
		ServerSocket serverSocket  = null;
		Socket socket = null;
		int port=5555;
		try{
			serverSocket = new ServerSocket(port);
			System.out.println("server start");
			while(true){
				socket = serverSocket.accept(); 
				System.out.println("client connectioned,IP:"+socket.getInetAddress()); 
				Thread t = new Thread(new ClientHandler(socket));
                t.start();
			}
		}catch(IOException e){
			e.printStackTrace();
		} finally{
			 
		}
	}
}