Java网络编程UDP协议发送接收数据

Java网络编程UDP协议发送接收数据

本文实例为大家分享了java网络编程UDP协议发送接收数据的具体代码，供大家参考，具体内容如下

UDP协议发送数据步骤

A：创建发送端socket对象；

B：创建数据，并把数据打包；

C：调用socket对象的发送方法发送数据包；

D：释放资源

package net;

import java.io.IOException;

import java.net.DatagramPacket;

import javpqQEjAGYVga.net.DatagramSocket;

import java.net.InetAddress;

public class SendDemo {

public static void main(String[] args) throws IOException {

//A

DatagramSocket ds = new DatagramSocket();

//B

byte[] by = "Hello,UDP".getBytes();

int length = by.length;

InetAddress addr = InetAddress.getByName("192.168.1.22");

int port = 10010;

DatagramPacket dp = new DatagramPacket(by, length, addr, port);

//C

ds.send(dp);

//D

ds.close();

}

}

UDP协议接收数据步骤

A：创建接收端socket对象；

B：创建一个数据包（接收容器）；

C：调用socket对象的接收方法接收数据；

D：解析数据，显示到控制台；

E：释放资源

package net;

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

public class ReceiveDemo {

public static void main(String[] args) throws IOException {

//A

DatagramSocket ds = new DatagramSocket(10010);

//B

byte[] by = new byte[1024];

int length = by.length;

DatagramPacket dp = new DatagramPacket(by, length);

//C

ds.receive(dp);

//D

//获取对方ip

InetAddress addr = dp.getAddress();

String ip = addr.getHostAddress();

byte[] by2 = dp.getData();

int len = by2.length;

String s = new String(by2, 0, len);

System.out.println(ip+"发送的数据是："+s);

//E

ds.close();

}

}

先运行接收端代码，再运行发送端代码。

多次从键盘接收发送数据版本

package net;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

public class SendDemo {

public statihttp://c void main(String[] args) throws IOException {

//A

DatagramSocket ds = new DatagramSocket();

//数据来自键盘录入

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

String line = null;

while((line = br.readLine()) != null){

//当输入jieshu时，结束

if("jieshu".equals(line)){

break;

}

//B

byte[] by = line.getBytes();

int length = by.length;

InetAddress addr = InetAddress.getByName("192.168.1.22");

int port = 10010;

DatagramPacket dp = new DatagramPacket(by, length, addr, port);

//C

ds.send(dp);

}

//D

ds.close();

}

}

package net;

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

public class ReceiveDemo {

public static void main(String[] args) throws IOException {

//A

DatagramSocket ds = new DatagramSocket(10010);

//多次接受版本

while(true){

//B

byte[] by = new byte[1024];

int length = by.length;

DatagramPacket dp = new DatagramPacket(by, length);

//C

ds.receive(dp);

//D

//获取对方ip

InetAddress addr = dp.getAddress();

String ip = addr.getHostAddress();

byte[] by2 = dp.getData();

int len = by2.length;

String s = new String(by2, 0, len);

System.out.println(ip+"发送的数据是："+s);

}

//E

//ds.close();

}

}

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