Cglib 入门

cglib 是一个很强大的动态字节增强库， 使用例子：

cglib 官网：http://cglib.sourceforge.net/howto.html

public class Dao {

public void update(){
System.out.println("update");
}

public void insert(){
System.out.println("insert");
}

public void delete(){
System.out.println("delete");
}

}




import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import net.sf.cglib.proxy.Enhancer;

public class Proxy implements  MethodInterceptor{


public Object getObject(Class target){
Enhancer en=new Enhancer();
en.setSuperclass(target);
en.setCallback(this);
return en.create();
}

/**
* @param args
*/
public static void main(String[] args) {

Proxy proxy=new Proxy();
Dao dao=(Dao)proxy.getObject(Dao.class);
dao.delete();
}

public Object intercept(Object arg0, Method arg1, Object[] arg2,
MethodProxy arg3) throws Throwable {
   System.out.println("before");
Object obj=arg3.invoke(arg0, arg2);
   System.out.println("after");
return obj;
}

}

增加一个属性：
en.setStrategy(new DefaultGeneratorStrategy(){

@Override
protected ClassGenerator transform(ClassGenerator cg)
throws Exception {
AddPropertyTransformer add=new AddPropertyTransformer(new String[]{ "foo" },new Type[]{ Integer.TYPE });
return new TransformingClassGenerator(cg,add);

}

});