simpletclientsocketdemo.java

java程序设计教程的源码

//【例11-6】  基于Socket的简单客户端程序。
//程序清单11-6:  SimpletClientSocketDemo.java
package socket;
import java.net.*;
import java.io.*;
public class SimpletClientSocketDemo {
	public static void main(String[] args) throws IOException {
		new SimpletClientSocket();
	}
}
class SimpletClientSocket {
	Socket socket = null;// 客户端Socket类的对象引用socket
	BufferedReader in;// 客户端输入流
	PrintWriter out;// 客户端输出流
	public SimpletClientSocket() throws IOException {
		try {// 获取Localhost地址
			InetAddress ClientIP = InetAddress.getByName(null);
			System.out.println("ClientIP = " + ClientIP);
			// 创建客户端Socket类的对象socket,服务器地址取本地，端口号为55558
			socket = new Socket(ClientIP, SimpleServerSocket.PORT);
			// 输出客户端套接字信息
			System.out.println("socket = " + socket);
			// 创建并包装客户端socket对象的输入流
			in = new BufferedReader(new InputStreamReader(socket
					.getInputStream()));
			// 创建并包装客户端socket对象的输出流，
			// PrintWriter流能自动刷新输出缓冲区（println()结束时）
			out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
			for (int i = 1; i < 10; i++) {// 数据交换
				out.println("From Client " + i);// 向服务器端输出数据
				System.out.println(in.readLine());// 从服务器端读入数据
			}
			out.println("结束");// 客户端向服务端输出通信结束标志
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {// 关闭连接，释放网络资源
			out.close();
			in.close();
			socket.close();
			System.out.println("客户端正常关闭连接！");
		}
	}
}