客户端+服务端1（提升）

• 需要先开启服务端在开启客户端

package reflect;

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

//服务端
public class TcpServerDemo01 {
    public static void main(String[] args) {
        ServerSocket serverSocket=null;
        Socket socket =null;
        InputStream is =null;
        ByteArrayOutputStream  baos =null;
        try {
            //1.需要有一个地址
           serverSocket = new ServerSocket(9999);

           while(true){
               //2.等待客户端连接过来
               socket = serverSocket.accept();
               //3.读取客户端的消息
               is = socket.getInputStream();
               //管道流
               baos = new ByteArrayOutputStream();
               byte[] buffer = new byte[1024];
               int len;
               while((len=is.read(buffer))!=-1){
                   baos.write(buffer,0,len);
               }
               System.out.println(baos.toString());
           }


        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            //关闭资源
            try {
                baos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }


        }

              try {
                  is.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }


              try {
                  socket.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }


              try {
                  serverSocket.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }

        }

    }

package reflect;

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

//客户端
public class TcpClientDemo01 {
    public static void main(String[] args) {
        Socket socket =null;
        OutputStream os=null;
        try {
            //1.要知道服务器的地址、端口号
            InetAddress serviceIP= InetAddress.getByName("127.0.0.1");
            int port=9999;
            //2.创建一个socket连接
            socket = new Socket(serviceIP, port);
            //3.发送消息  I/O流
            os = socket.getOutputStream();

            os.write("你好，欢迎学习Java".getBytes());

        } catch (Exception e) {
            e.printStackTrace();
        }finally {

                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }




                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }


        }

    }

}