浅谈java的TCP和UDP编程(附实例讲解)

tcp

客户端：

 

import java.io.bufferedreader;
import java.io.inputstreamreader;
import java.io.printwriter;
import java.net.socket;

public class myclient {

  public static void main(string[] args) throws exception{
    
    socket socket = null;
    bufferedreader in = null;
    printwriter out = null;
    
    bufferedreader input = null;
    // 请求指定ip和端口号的服务器
    socket = new socket("127.0.0.1",3333);
    
    while(true){

      in = new bufferedreader(new inputstreamreader(socket.getinputstream()));
      
      out = new printwriter(socket.getoutputstream(), true);
      // 接收控制台的输入
      input = new bufferedreader(new inputstreamreader(system.in));
      // out.println("this is client info!");
      string info = input.readline();
      
      out.println(info);
      
      string str = in.readline();
      
      system.out.println("客户端显示--》服务器的信息：" + str);
    }
    //in.close();
    //out.close();
  }

}

 服务端：

import java.io.bufferedreader;
import java.io.inputstreamreader;
import java.io.printwriter;
import java.net.serversocket;
import java.net.socket;

public class myservices {

  public static void main(string[] args) throws exception{
    serversocket ss = null;
    socket socket = null;
    bufferedreader in = null;
    printwriter out = null;
    bufferedreader input = null;
    
    // 监听3333端口
    ss = new serversocket(3333);
    // 等待接收客户端的请求
    socket = ss.accept();
    while(true){
      // 获取连接对象的输入流
      in = new bufferedreader(new inputstreamreader(socket.getinputstream()));
      // 获取客户端的输入信息
      string str = in.readline();
      
      input = new bufferedreader(new inputstreamreader(system.in));
      
      system.out.println("服务器显示-->客户端输入数据：" + str);
      
      out = new printwriter(socket.getoutputstream(),true);
      // 将数据输出到客户端
      // out.println("hehe");
      string info = input.readline();
      
      out.println(info);
    }
//    in.close();
//    out.flush();
//    out.close();
  }

}

udp

客户端：

import java.net.datagrampacket;
import java.net.datagramsocket;

public class udpclient {

  public static void main(string[] args) throws exception {
    
    datagramsocket ds = null;
    datagrampacket dp = null;
    byte[] buf = new byte[1024];
    
    ds = new datagramsocket(3333);
    dp = new datagrampacket(buf, 1024);
    
    // 接收数据，放入数据报
    ds.receive(dp);
    // 从数据报中取出数据
    string info = new string(dp.getdata(),0, dp.getlength());
    system.out.println("接收到的信息是：" + info);
  }

}

服务端：

import java.net.datagrampacket;
import java.net.datagramsocket;
import java.net.inetaddress;

public class udpserver {

  public static void main(string[] args) throws exception {
    datagramsocket ds = null;
    datagrampacket dp = null;
    
    // 构建发送对象
    ds = new datagramsocket();
    // 将数据打包-->打成数据报
    string info = "hello world!";
    
    dp = new datagrampacket(info.getbytes(), info.length(), inetaddress.getbyname("localhost"),3333);
    
    // 发出数据报
    ds.send(dp);
    
  }

}

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