I am very helpful to this example of implementing the database connection pool!
Firstly, it is generated in a interface. Java
Package proxytest;
Public interface cons {void close (); void open ();
Below is a CONSIMPL.JAVA for implementing CONS:
Package proxytest;
Public Class Consimpl Implements Cons {Public Void Close () {system.out.println ("Call CLOSE Method Implemented!"); ");
}
We now have to block the close () method! It is necessary to generate a proxy consPropy.java:
Package proxytest;
Import java.lang.reflect. *;
Public class consproxy imports invocationhandler {public consproxy (cons _cons) {this.cons = _cons;} public cons getcons () // Generate a proxy object! {Cons.newProxyInstance (Cons.getClass (). GetClassLoader (), cons. GetClass (); getInterface (); return cable1;} public object infhot (Object Proxy, Method M, Object [ ] args) throws throwable {Object obj = null; // Determine whether to call a Close method, if you call the Close method, call the other way you want to call! IF (close_method_name.equals)) Close (); else obj = m.invoke (cons, args); returnobj;} public void close () {system.out.println ("calling agent Close method! ");
Private cons cons = null; private final static string close_method_name = "close";
After generating a proxy, we can test, test code proxytest.java
Package proxytest;
Public class proxytest {public static void main (string args []) {cond = new consimpl (); consProxy proxy = new conspproxy (); cons (); // Get the agent CONS. CLOSE (); // This is there is no Agent's cons object! CONS1.CLOSE (); // This is an agent object}
}
Results of the:
Call the CLOSE method implemented by consimpl! Call the close method in the agent!
It's so simple, I hope to help everyone!
