01.socket定义


02.TCP编程

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


public class clientSocket {
    public static void main(String[] args) throws IOException {
       //创建客户端socket，这个socket链接的ip地址是主机，用Inetaddress来获取，此时是主机，端口号是9999
        Socket socket=   new Socket(InetAddress.getLocalHost(),9999);
        System.out.println("客户端的socket"+socket.getClass());
        //获取这个socket的输出流
        OutputStream outputStream= socket.getOutputStream();
        //输出流输出的写方法
        outputStream.write("hello  server ".getBytes());
        //关闭
        outputStream.close();
        socket.close();
    }
}

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

public class serverSocket {

    public static void main(String[] args) throws IOException {
     //在主机创建服务器socket，用于对客户端socket访问进行回复，此时设置的端口号是9999
      ServerSocket server=new ServerSocket(9999);
      //服务器Serversocket开启监听模式，一旦监听到客户端socket的访问，就会马上返回一个socket到客户端进行通信，这个返回的socket就是变量      声明的这个socket
       //等待客户端连接，此方法连接之前一直阻塞
        Socket socket= server.accept();
        //获取返回的socket的输入流
        InputStream inputStream=socket.getInputStream();
        //设置读取数据放置的位置，一个比特数组
        byte[] readruf=new byte[1024];
        //read函数的标识位，这个是inputstream的read函数
        int readlen=0;
        //具体看inputstream的read函数源码，把数据从输入流中读到byte数组
        while((readlen=inputStream.read(readruf))!=-1){
        //打印
            System.out.println(new String(readruf,0,readlen));
        }
        inputStream.close();
        server.close();、    
        socket.close();
        }
        

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


public class clientSocket {
    public static void main(String[] args) throws IOException {
        //创建客户端socket，这个socket链接的ip地址是主机，用Inetaddress来获取，此时是主机，端口号是9999
        Socket socket=   new Socket(InetAddress.getLocalHost(),9999);
        
        System.out.println("客户端的socket"+socket.getClass());
        //获取socket输出流，写了hello  server
        OutputStream outputStream= socket.getOutputStream();
        outputStream.write("hello  server ".getBytes());
        //因为来回的都是这个链接（不是socket），需要关闭链接的输出流，互斥的
        socket.shutdownOutput();
        
        InputStream inputStream=socket.getInputStream();
        byte[] readruf=new byte[1024];
        int readlen=0;
        while((readlen=inputStream.read(readruf))!=-1){
            System.out.println(new String(readruf,0,readlen));
        }
        
        inputStream.close();
        outputStream.close();
        socket.close();
    }
}

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

public class serverSocket {

    public static void main(String[] args) throws IOException {
  		ServerSocket server=new ServerSocket(9999);
        Socket socket= server.accept();
        
        InputStream inputStream=socket.getInputStream();
        byte[] readruf=new byte[1024];
        int readlen=0;
        while((readlen=inputStream.read(readruf))!=-1){
            System.out.println(new String(readruf,0,readlen));
        }
        
        OutputStream outputStream= socket.getOutputStream();
        outputStream.write("hello ".getBytes());

        socket.shutdownOutput();
        
        outputStream.close();
        inputStream.close();
        server.close();、    
        socket.close();
        }