目錄

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基本概念

代碼與實(shí)例

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基本概念

這里主要是使用了DatagramSocket可以打開本地端口，構(gòu)建Socket，同時(shí)這個(gè)類還可以給指定IP和端口發(fā)送數(shù)據(jù)包。

如下，打開本地端口并接收數(shù)據(jù)：

DatagramSocket ds = new DatagramSocket(2000);//構(gòu)建接收實(shí)體 final byte[] buf = new byte[512]; DatagramPacket receiverPack = new DatagramPacket(buf, buf.length);//接收 ds.receive(receiverPack);

接收到的數(shù)據(jù)會(huì)傳給receiverPack。

同樣如果是發(fā)送

DatagramPacket responsePacket = new DatagramPacket(responseDataBytes, responseDataBytes.length, receiverPack.getAddress(), receiverPack.getPort());ds.send(responsePacket);

通過構(gòu)造DatagramPacket指明IP和端口，就可以發(fā)送數(shù)據(jù)了

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代碼與實(shí)例

程序運(yùn)行截圖如下：

源碼如下：

UDPProvider.java

import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket;public class UDPProvider {public static void main(String[] args) throws IOException {System.out.println("UDPProvider Started.");//接收者，指定接收數(shù)據(jù)DatagramSocket ds = new DatagramSocket(2000);//構(gòu)建接收實(shí)體final byte[] buf = new byte[512];DatagramPacket receiverPack = new DatagramPacket(buf, buf.length);//接收ds.receive(receiverPack);//打印發(fā)送者信息String ip = receiverPack.getAddress().getHostAddress();int port = receiverPack.getPort();int dataLen = receiverPack.getLength();String data = new String(receiverPack.getData(), 0, dataLen);System.out.println("UDPProvider receive from ip: " + ip + "\tport: " + port + "\tdata: " + data);//構(gòu)建一份回送數(shù)據(jù)String responseData = "Receive data with len: " + dataLen;byte[] responseDataBytes = responseData.getBytes();DatagramPacket responsePacket = new DatagramPacket(responseDataBytes,responseDataBytes.length,receiverPack.getAddress(),receiverPack.getPort());ds.send(responsePacket);System.out.println("UDPProvider Finished!");ds.close();} }

UDPSearcher.java

import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress;public class UDPSearcher {public static void main(String[] args) throws IOException {System.out.println("UDPSearcher Started.");//搜索方自動(dòng)分配端口DatagramSocket ds = new DatagramSocket();//構(gòu)建一份回送數(shù)據(jù)String requestData = "Hello World";byte[] requestDataBytes = requestData.getBytes();//根據(jù)發(fā)送者構(gòu)造一份回送信息DatagramPacket requestPacket = new DatagramPacket(requestDataBytes, requestDataBytes.length);//本機(jī)2000端口requestPacket.setAddress(InetAddress.getLocalHost());requestPacket.setPort(2000);ds.send(requestPacket);//構(gòu)建接收實(shí)體final byte[] buf = new byte[512];DatagramPacket receiverPack = new DatagramPacket(buf, buf.length);//接收ds.receive(receiverPack);//打印發(fā)送者信息String ip = receiverPack.getAddress().getHostAddress();int port = receiverPack.getPort();int dataLen = receiverPack.getLength();String data = new String(receiverPack.getData(), 0, dataLen);System.out.println("UDPSearcher receive from ip: " + ip + "\tport: " + port + "\tdata: " + data);System.out.println("UDPSearcher Finished!");ds.close();} }

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