Posted on 2007-11-05 10:22
G_G 閱讀(5794)
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AOP
看hbn 源代碼 發(fā)現(xiàn)用了 CGlib 這就看看這個(gè)jar 。特留個(gè)文 ^_^(轉(zhuǎn)）http://www.nirvanastudio.org/java/cglib-%E6%8C%87%E5%8D%97.html
CGlib 就2個(gè)例能說明一切?
先是使用類? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??
public?class?MyClass?{
?
????public?void?method()?{
????????System.out.println("MyClass.method()");
????}
????public?void?method2()?{
????????System.out.println("MyClass.method2()");
????}
}
例1：
import?java.lang.reflect.Method;
?
import?net.sf.cglib.proxy.Enhancer;
import?net.sf.cglib.proxy.MethodProxy;
import?net.sf.cglib.proxy.MethodInterceptor;
?
public?class?Main?{
?
????public?static?void?main(String[]?args)?{
?
????????Enhancer?enhancer?=?new?Enhancer();
??? ??
??? ??? //在這代理了
????????enhancer.setSuperclass(MyClass.class);
????????enhancer.setCallback(?new?MethodInterceptorImpl()?);
?
??????? // 創(chuàng)造 代理 （動(dòng)態(tài)擴(kuò)展了MyClass類）
????????MyClass?my?=?(MyClass)enhancer.create();
?
????????my.method();
????}
?
????private?static?class?MethodInterceptorImpl?implements?MethodInterceptor?{
????????
????????public?Object?intercept(Object?obj,?
????????????????????????????????Method?method,?
????????????????????????????????Object[]?args,?
????????????????????????????????MethodProxy?proxy)?throws?Throwable?{
?
????????????System.out.println(method);
?
????????????proxy.invokeSuper(obj,?args);
?
????????????return?null;
????????}
????}
}
例2：
import?java.lang.reflect.Method;
import?net.sf.cglib.proxy.Enhancer;
import?net.sf.cglib.proxy.MethodProxy;
import?net.sf.cglib.proxy.MethodInterceptor;
import?net.sf.cglib.proxy.NoOp;
import?net.sf.cglib.proxy.Callback;
import?net.sf.cglib.proxy.CallbackFilter;
?
?
public?class?Main2?{
?
????public?static?void?main(String[]?args)?{
?
????????Callback[]?callbacks?=
????????????new?Callback[]?{?new?MethodInterceptorImpl(),??NoOp.INSTANCE?};
?
????????Enhancer?enhancer?=?new?Enhancer();
?
????????enhancer.setSuperclass(MyClass.class);
????????enhancer.setCallbacks(?callbacks?);
??????? //添加 方法過濾器? 返回1為不運(yùn)行 2 為運(yùn)行
????????enhancer.setCallbackFilter(?new?CallbackFilterImpl()?);
?
?
????????MyClass?my?=?(MyClass)enhancer.create();
?
????????my.method();
????????my.method2();
????}
?
????private?static?class?CallbackFilterImpl?implements?CallbackFilter?{
?
????????public?int?accept(Method?method)?{
?
????????????if?(?method.getName().equals("method2")?)?{
????????????????return?1;
?
????????????}?else?{
????????????????return?0;
????????????}
????????}
????}
?
????private?static?class?MethodInterceptorImpl?implements?MethodInterceptor?{
????????
????????public?Object?intercept(Object?obj,?
????????????????????????????????Method?method,?
????????????????????????????????Object[]?args,?
????????????????????????????????MethodProxy?proxy)?throws?Throwable?{
?
????????????System.out.println(method);
?
????????????return?proxy.invokeSuper(obj,?args);
????????}
????}
}
簡單不 哈哈 比jdk 中的動(dòng)態(tài)代理好用 ，那還要接口? 不太方便 。