JAVA网络编程

package cn.lzc.day01.nio;
import java.net.InetAddress;

public class InterAddressTest {
    public static void main(String[] args) {
        try {
            InetAddress inet1= InetAddress.getByName("192.168.1.1");
            System.out.println(inet1);
            InetAddress inet2=InetAddress.getByName("www.baidu.com");
            System.out.println(inet2);


            InetAddress inet3=InetAddress.getLocalHost();
            System.out.println(inet3);

            System.out.println(inet3.getHostAddress());
            System.out.println(inet3.getHostName());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

package cn.lzc.day01.nio;


import org.junit.Test;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * 实现TCP的网络编程
 * 例子1：客户端发送信息给服务器，服务端将数据显示在控制台上
 */
public class TcpTest {

    //    客户端
    @Test
    public void test() {
        OutputStream os = null;
        Socket socket = null;
        try {
//            创建Socket对象，指明服务器端的ip和端口号
            InetAddress inet = InetAddress.getByName("127.0.0.1");
//            获取一个输出流，用于输出数据
            socket = new Socket(inet, 8899);

            os = socket.getOutputStream();
//            写出数据的操作
            os.write("你好,我是客户端luck".getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null)
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            if (socket != null)
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
        }
    }

    //    服务端
    @Test
    public void test1() {

        ServerSocket ss = null;
        Socket socket = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;