UDP的实现
Java中实现UDP协议的两个类,分别是DatagramPacket数据包类以及DatagramSocket套接字类。
其与TCP协议实现不同的是：
UDP的套接字DatagramSocket相比于Socket、ServerSocket来说，是一个非常简单的概念，没有连接的含义。套接字只需要知道侦听和发送数据包的本地端口即可。
也就是在TCP协议中庸Socket类和ServerSocket类进行功能划分，UDP协议中只用一个数据包套接字DatagramSocket发送和接受数据即可。
发送和接收数据、地址和端口都封装在数据包类DatagramPacket中。
DatagramPacket类
构造函数：
public DatagramPacket(byte[] buf,int length);
/*offset为buf缓冲区的偏移量*/
public DatagramPacket(byte[] buf,int offset,int length);
/*address表示目的地址 port表示目的端口*/
public DatagramPacket(byte[] buf,int offset,int length,InetAdress address, int port)
常用方法:
/*返回接受数据包的主机IP地址，通常用于获取接受到数据包的发送主机IP*/
public InetAdress getAdress();
/*返回数据包的主机端口号*/
public int getPort();
/*返回被接收或发送的缓冲区数据*/
public byte[] getData();
/*设置返回发出数据包的主机IP地址*/
public void setAdress(InetAdress iaddr);
/*设置要将此数据包发往远程主机上的端口号*/
public void setPort(int iport);
DatagramSocket类
对于数据包套接字DatagramSocket来说，它只是发送或接收数据包的端口，不需要考虑链接。因此在客户端和服务器端都需要建立一个DatagramSocket对象，然后通过receive()方法接受数据包，通过send()方法发送数据包。
端口相关对照
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alt="" />
UDP网络应用实例
客户端发送1-26数字给服务器端；
服务器端返回对应的A-Z给客户端。
客户端程序：
package web; import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.Scanner; public class UDPCilent {
public static void main(String[] args) {
try {
/*UDP Cilent SEND*/
DatagramSocket socket=new DatagramSocket();
System.out.println("UDP Cilent Start...");
System.out.println("Enter 1 to 26 ,Server Will Return U A to Z:");
String info=new Scanner(System.in).next();
socket.send(new DatagramPacket(info.getBytes(), info.length(),InetAddress.getByName("127.0.0.1"),3000));
System.out.println("UDP Cilent Send Message..."); byte[] rec=new byte[1024];
DatagramPacket recivepacket=new DatagramPacket(rec, rec.length);
socket.receive(recivepacket);
System.out.println("Receive"); String reciveData=new String(recivepacket.getData(),0,recivepacket.getLength());
System.out.println("Receive from"+recivepacket.getAddress().getHostAddress()+":"+reciveData); socket.close();
System.out.println("UDP Cilent close...");
} catch (Exception e) {
// TODO: handle exception
}
}
}
服务端程序
package web; import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.Socket; public class UDPServer { public static void main(String[] args) {
try { /*UDP Receive Message*/
DatagramSocket socket=new DatagramSocket(3000);
byte []bf=new byte[1024];
DatagramPacket packet=new DatagramPacket(bf, 1024);
System.out.println("UDP Server Start... Wait to Receive Message..."); socket.receive(packet);
String info=new String(packet.getData(),0,packet.getLength())+"from"+packet.getAddress().getHostAddress()+":"+packet.getPort();
System.out.println(info); /*feedback*/
InetAddress address= packet.getAddress();
int port=packet.getPort();
String str=new String(packet.getData(),0,packet.getLength());
int renum=Integer.parseInt(str);
int feedback='A';
for(int i=1;i<=26;i++)
{
if(renum==i){
feedback=feedback+(i-1);
}
}
char back=(char) feedback;
String fbString=back+"";
byte[] fstr=fbString.getBytes();
DatagramPacket feed= new DatagramPacket(fstr,fstr.length,address,port); socket.send(feed);
socket.close();
System.out.println("UDP Server close...");
} catch (Exception e) {
// TODO: handle exception
}
} }