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java UDP´«Êä

TCPͨ¹ý ServerSocket ºÍ Socket À´ÊµÏÖ´«Êä
UDPÖ÷Ҫͨ¹ý DatagramSocket ºÍ DatagramPacket À´Íê³É´«Êä
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public class UdpServer
{
private DatagramSocket server;
private DatagramPacket packet;
private byte[] b;
private String str;
public UdpServer()
{
Init();
}
private void Init()
{

b = new byte[1024];

receive();
}
private void receive()
{
try
{
server=new DatagramSocket(11111); //°ó¶¨11111¶Ë¿Ú
while(true)
{
packet = new DatagramPacket(b, b.length);
server.receive(packet); //½ÓÊÕÊý¾Ý°ü
int i = packet.getLength();
if(i>0) //Êý¾Ý°üÓÐÄÚÈÝ£¬¾Í´òÓ¡³ö½ÓÊÕµ½µÄÊý¾Ý
{
str = new String(b, 0, i);
System.out.println("½ÓÊÕµ½µÄ×Ö·û == " + str);
packet = null;
}
}
}catch(SocketException e)
{
e.printStackTrace();
}catch(IOException e)
{
e.printStackTrace();
}finally
{
server.close();
}
}
public static void main(String[] args)
{
new UdpServer();
}
}
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public class UdpClient
{
private DatagramSocket client;
private DatagramPacket packet;
private byte b[];
public UdpClient()
{
Init();
}
private void Init()
{
b = new byte[1024];

send();
}
private void send()
{
try
{
client = new DatagramSocket();

b = "UDPÊý¾Ý·¢ËÍ".getBytes(); //·¢Ë͸ø·þÎñÆ÷¶ËµÄÊý¾Ý

packet = new DatagramPacket(b, b.length, new InetSocketAddress("127.0.0.1", 11111)); //°ó¶¨·þÎñÆ÷
client.send(packet); //·¢ËÍÊý¾Ý°ü
} catch (SocketException e)
{
e.printStackTrace();
} catch (IOException e)
{
e.printStackTrace();
} finally
{
client.close();
}
}
public static void main(String[] args)
{
new UdpClient();
}
}


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linuxϲ鿴java·¾¶

ÓÃÃüÁî whereis java¾Í¿ÉÒÔ¿´µ½ÁË
eg:
-bash-3.1$ whereis java
java: /usr/bin/java /etc/java /usr/lib/java /usr/share/java /opt/jdk1.6.0_01/bin/java

Èç¹û½ö½öÏëÖªµÀjavaÖ´Ðз¾¶ÔÚÄÇÀïµÄ»° ÓÃwhich java¾Í¿ÉÒÔÁË
eg:
-bash-3.1$ which java
/usr/bin/java ......

ÈçºÎÍ£Ö¹javaÏß³Ì

ÈçºÎÍ£Ö¹javaµÄÏß³ÌÒ»Ö±ÊÇÒ»¸öÀ§ÄÕÎÒÃÇ¿ª·¢¶àÏ̳߳ÌÐòµÄÒ»¸öÎÊÌâ¡£Õâ¸öÎÊÌâ×îÖÕÔÚJava5µÄjava.util.concurrentÖеõ½Á˻شð£ºÊ¹ÓÃinterrupt()£¬ÈÃÏß³ÌÔÚrun·½·¨ÖÐÍ£Ö¹¡£ ¼ò½é ÔÚJavaµÄ¶àÏ̱߳à³ÌÖУ¬java.lang.ThreadÀàÐͰüº¬ÁËһЩÁеķ½·¨start(), stop(), stop(Throwable) and suspend(), destroy() and resume()¡£Í¨¹ ......

javaÖÐÈçºÎ»ñµÃ²Ù×÷ϵͳÏÂÓû§Ä¿Â¼


String usrHome = System.getProperty("user.home");
ÏÂÃæÊÇSystemµÄ²ÎÊýÁбí
Key                     Meaning
-------------------     ---------------------- ......

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     Èç¹ûʹÓÃGOOGLE¡¢BAIDUµÈËÑË÷¹¤¾ß£¬ËÑË÷WebServiceµÄÏà¹ØÖªÊ¶£¬¿ÉÒԲ鵽N¶àµÄÍøÒ³£¬ÎÒ¾ÍÊÇͨ¹ýÕâÐ©ÍøÒ³µÄѧϰ£¬Öð½¥ÕÆÎÕÁËЩW ......

java Ï̺߳ǫ́ÔËÐÐʾÀý

import java.io.IOException;
public class ResponseUI extends Thread{
private static volatile double d = 1;

public ResponseUI(){
super.setDaemon(true); //ÉèÖúǫ́ÔËÐÐ
start();
}

public void run(){
while(true){
d = d + (Math.E + Math.PI) / d;
}
}
/**
* @param args ......
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