TCP客户端和服务端的交互

package com.inetaddress;

import com.sun.corba.se.spi.activation.Server;
import org.junit.Test;

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

//TCP客户端发送消息给服务端  服务端在控制台打印信息 并发送消息给服务端
public class TestTCP2 {

    @Test
    public void client(){
        Socket socket = null;
        OutputStream outputStream = null;
        InputStream inputStream = null;
        try {
            socket = new Socket(InetAddress.getByName("127.0.0.1"),9090);
            outputStream = socket.getOutputStream();
            outputStream.write("在吗？".getBytes());
            socket.shutdownOutput(); //告诉服务端我写完了   不然的话一直在等
            inputStream = socket.getInputStream();
            byte[] b = new byte[20];
            int len;
            while((len = inputStream.read(b)) != -1){
                String string = new String(b, 0, len);
                System.out.println("客户端"+string);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(socket != null){
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(outputStream != null){
                try {
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(inputStream != null){
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }


    @Test
    public void server(){
        ServerSocket serverSocket = null;
        Socket socket = null;
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            serverSocket = new ServerSocket(9090);
            socket = serverSocket.accept();
            inputStream = socket.getInputStream();
            byte[] b = new byte[20];
            int len;
            while((len = inputStream.read(b)) != -1){
                String str = new String(b, 0, len);
                System.out.println("服务端"+str);
            }
             outputStream = socket.getOutputStream();
            outputStream.write("在的 我在忙".getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(serverSocket != null){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(socket != null){
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(inputStream != null){
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(outputStream != null){
                try {
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }

}