udp接手段java代码 java基于udp的socket编程

java编程利用UDP方式，客户端向服务器发送三边值，服务器，根据三边值计算三角形面积返回客户端创建两个类分别添加main方法一个作为server类一个作为client类
客户端先发送再接收服务器端先接收再发送
下面给你一个server和client的例子你在基础上改一下就行了
client发送的时候发送三边值server接收后写一个计算三角形面积的函数把接收到的三边值传入函数计算出结果作为数据返回到client端
/**
*UDPServer
*/
import java.io.*;
import java.net.*;
class UDPServer{
public static void main(String[] args)throws IOException{
DatagramSocketserver = new DatagramSocket(5050);
byte[] recvBuf = new byte[100];
DatagramPacket recvPacket
= new DatagramPacket(recvBuf , recvBuf.length);
server.receive(recvPacket);
String recvStr = new String(recvPacket.getData() , 0 , recvPacket.getLength());
System.out.println("Hello World!" + recvStr);
int port = recvPacket.getPort();
InetAddress addr = recvPacket.getAddress();
String sendStr = "Hello ! I'm Server";
byte[] sendBuf;
sendBuf = sendStr.getBytes();
DatagramPacket sendPacket
= new DatagramPacket(sendBuf , sendBuf.length , addr , port );
server.send(sendPacket);
server.close();
}
}
/**
*UDPClient
*/
import java.io.*;
import java.net.*;
class UDPClient{
public static void main(String[] args)throws IOException{
DatagramSocket client = new DatagramSocket();
String sendStr = "Hello! I'm Client";
byte[] sendBuf;
sendBuf = sendStr.getBytes();
InetAddress addr = InetAddress.getByName("127.0.0.1");
int port = 5050;
DatagramPacket sendPacket
= new DatagramPacket(sendBuf ,sendBuf.length , addr , port);
client.send(sendPacket);
byte[] recvBuf = new byte[100];
DatagramPacket recvPacket
= new DatagramPacket(recvBuf , recvBuf.length);
client.receive(recvPacket);
String recvStr = new String(recvPacket.getData() , 0 ,recvPacket.getLength());
System.out.println("收到:" + recvStr);
client.close();
}
}
java 实现 UDP连接的源程序import java.io.*;
import java.lang.*;
import java.net.*;
public class uclient
{
private DatagramSocket cli;
private DatagramPacket pac;
private byte sb[];
private String sen;
public uclient()
{
Init();
}
public void Init()
{
try
{
//指定端口号，避免与其他应用程序发生冲突
cli=new DatagramSocket(10002);
sb=new byte[1024];
sen="UDP方式发送数据";
sb=sen.getBytes();
pac=new DatagramPacket(sb,sb.length,InetAddress.getByName("localhost"),10005);
cli.send(pac);
}
catch(SocketException se)
【udp接手段java代码 java基于udp的socket编程】{
se.printStackTrace();
}
catch(IOException ie)
{
ie.printStackTrace();
}
}
public static void main(String args[])
{
new uclient();
}
}
接收端数据:
//加以改进代码,可以改变接收方式
import java.io.*;
import java.lang.*;
import java.net.*;
public class userve
{
private DatagramSocket ser;
private DatagramPacket pac;
private byte rb[];
private String rev;
public userve()
{
Init();
}
public void Init()
{
try
{
ser=new DatagramSocket(10005);
rb=new byte[1024];
pac=new DatagramPacket(rb,rb.length);
rev="";
int i=0;
while(i==0)//无数据，则循环
{
ser.receive(pac);
i=pac.getLength();
//接收数据
if(i0)