使用Socket访问服务器指定端口

       一个简单的Demo，使用socket访问指定ip地址的指定端口进行数据读写

 

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class SocketDemo {

	private static final String SERVER_NAME = "";//服务器IP地址
	private static final int PORT_NUM = 8081;//服务器端口
	private static final int TIME_OUT = 2000;//设置超时时间
	
	public static void main(String[] args) {
		Socket socket = null;
		try {
            socket = new Socket();
            socket.connect(new InetSocketAddress(SERVER_NAME, PORT_NUM), TIME_OUT);//建立连接，设置连接超时时间
            socket.setSoTimeout(TIME_OUT);//设置读写超时时间
			
            //打印连接信息
			System.out.println("Connected to " + socket.getInetAddress()
			+ " on port " + socket.getPort()
			+ " from port" + socket.getLocalPort()
			+ " of " + socket.getLocalAddress());
			
			//获取读写操作对象
			BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
			
			String phone = "10086";
			String password = "123456";
			
			//使用通用的"\r\n"，并且及时刷缓冲区
			writer.write(phone + "\r\n");
			writer.flush();
			writer.write(password + "\r\n");
			writer.flush();
			
			//读取消息直到连接关闭
			String result = null;
			while((result = reader.readLine()) != null){
				System.out.println(result);
			}
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			System.out.println("连接失败");
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			System.out.println("读写错误");
			e.printStackTrace();
		}finally {
			if(socket != null){
				try {
					socket.close();
				} catch (IOException e) {
					//ignore
				}
			}
		}
		System.out.println("连接结束");
	}
}