java编程实现基于UDP协议传输数据的方法

本文实例讲述了java编程实现基于udp协议传输数据的方法。分享给大家供大家参考，具体如下：

udp协议（user datagram protocol,用户数据报协议）不同于tcp协议，它是不可能靠的，但是它比tcp协议具有更快的传输速度，udp发送的数据单元称为数据报，当网络传输udp传输udp数据报是无法保证数据能够到达目的地，也无法保证按发送的顺序到达目的地，也就是说先发送了“hello”,再发送了“world”,但接收方可能会先收到“world”,再收到“hello”,也有可能收不到数据，为什么呢？因为它是不可能靠的，在传输途中可能丢失了。但udp比tcp跟适合与传输实时音频。下面是一个简单的upd传输数据报的例子

服务器端：

import java.io.ioexception; 
import java.net.datagrampacket; 
import java.net.datagramsocket; 
import java.net.socketexception; 
public class echoserver { 
 private datagramsocket datagramsocket; 
 private final int port = 8088; 
 public static void main(string[] args) throws socketexception { 
  new echoserver().service(); 
 } 
 public echoserver() throws socketexception{ 
  datagramsocket = new datagramsocket(port); 
  system.out.println("服务器启动"); 
 } 
 public string echo(string msg){ 
  return "echo:"+msg; 
 } 
 public void service(){ 
  while (true) { 
   try { 
    datagrampacket packet = new datagrampacket(new byte[512], 512); 
    datagramsocket.receive(packet); 
    string msg = new string(packet.getdata(), 0, packet.getlength()); 
    system.out.println(packet.getaddress()+"/"+packet.getport()+" msg:"+msg); 
    packet.setdata(echo(msg).getbytes()); 
    datagramsocket.send(packet); 
   } catch (ioexception e) { 
    e.printstacktrace(); 
   } 
  } 
 } 
}

客户端：

import java.io.bufferedreader; 
import java.io.ioexception; 
import java.io.inputstreamreader; 
import java.net.datagrampacket; 
import java.net.datagramsocket; 
import java.net.inetaddress; 
import java.net.socketexception; 
public class echoclient { 
 private string remotehost="localhost"; 
 private int remoteport=8088; 
 private datagramsocket datagramsocket; 
 public echoclient() throws socketexception{ 
  datagramsocket = new datagramsocket(); 
 } 
 public static void main(string[] args) throws socketexception { 
  new echoclient().talk(); 
 } 
 public void talk(){ 
  try { 
   bufferedreader reader = new bufferedreader(new inputstreamreader(system.in)); 
   string msg = null; 
   inetaddress address = inetaddress.getbyname(remotehost); 
   while ((msg=reader.readline())!=null) { 
    //发送数据报 
    byte [] buffer = msg.getbytes(); 
    datagrampacket packet = new datagrampacket(buffer,buffer.length, address, remoteport); 
    datagramsocket.send(packet); 
    //接收数据报 
    datagrampacket inputpacket = new datagrampacket(new byte[512], 512); 
    datagramsocket.receive(inputpacket); 
    system.out.println(new string(inputpacket.getdata(), 0 , inputpacket.getlength())); 
    if("bye".equals(msg)){ 
     break; 
    } 
   } 
  } catch (ioexception e) { 
   e.printstacktrace(); 
  }finally{ 
   datagramsocket.close(); 
  } 
}

希望本文所述对大家java程序设计有所帮助。