Use the proxy technology in JDK to implement the AOP Function

Package cn.com. Xinli. Service;

Public interface userdao {
Public void save (string name );

Public void Update (string name, integer personid );

Public String getpersonname (integer personid );
}

 

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Package cn.com. Xinli. Service. impl;
Import org. Apache. log4j. Logger;
Import cn.com. Xinli. Service. userdao;

Public class userdaoimpl implements userdao {

Logger log = logger. getlogger (userdaoimpl. Class );
String username;

Public userdaoimpl (){
}
Public userdaoimpl (string username ){
Super ();
This. Username = username;
}
Public String GetUserName (){
Return username;
}
Public String getpersonname (integer personid ){
System. Out. println ("The getpersonname method is executed ");
Return username;
}
Public void save (string name ){
System. Out. println ("the Save method is executed ");
}
Public void Update (string name, integer personid ){
System. Out. println ("update method executed ");

}

}
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Package cn.com. Xinli. AOP;

Import java. Lang. Reflect. invocationhandler;
Import java. Lang. Reflect. method;
Import java. Lang. Reflect. proxy;

Import cn.com. Xinli. Service. userdao;
Import cn.com. Xinli. Service. impl. userdaoimpl;

Public class jdkproxyfactory implements invocationhandler {

Private object targetobject;

Public object invoke (Object proxy, method, object [] ARGs)
Throws throwable {
Userdao bean = (userdao) targetobject;
Object result = NULL;
System. Out. println (method. getname () + "start to execute ...");
Result = method. Invoke (targetobject, argS );
System. Out. println (method. getname () + "log end ...");
Return result;
}

Public object createproxyinstance (Object targetobject ){
This.tar GetObject = targetobject;
Return proxy.newproxyinstance(this.tar GetObject. getclass (). getclassloader (),
This.tar GetObject. getclass (). getinterfaces (), this );
}

}

 

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Test:

@ Test
Public void test1 (){
Jdkproxyfactory factory = new jdkproxyfactory ();
Userdaoimpl userdao = new userdaoimpl ();
Userdao proxyuserdao = (userdao) Factory. createproxyinstance (userdao );
Proxyuserdao. Save ("Zhang Qi ");
Proxyuserdao. Update ("ca", 1 );
}