AOP

------------------------------------------实现AOP------------------------------------------
/**
 * 使用java的反射
 * 进行aop功能的模拟
 * @author scipio
 * @created 2013-10-21
 */
public class Aop {
 
    private static CrossCutting cut=new CrossCutting();
    private static ReflectUtils rfBefore=new ReflectUtils(cut,"before");
    private static ReflectUtils rfAfter=new ReflectUtils(cut,"after");
 
    public static void beforeAdvice(Object target,String methodName,Object ... params){
        Class cls=target.getClass();
        Method[] methods=cls.getDeclaredMethods();
        for(int i=0;i<methods.length;i++){
            if(methods[i].getName().equals(methodName)){
                rfBefore.invokeMethod();
                new ReflectUtils(target,methodName,params).invokeMethod();
            }
        }
    }
 
    public static void afterAdvice(Object target,String methodName,Object... params){
        Class cls=target.getClass();
        Method[] methods=cls.getDeclaredMethods();
        for(int i=0;i<methods.length;i++){
            if(methods[i].getName().equals(methodName)){
                new ReflectUtils(target,methodName,params).invokeMethod();
                rfAfter.invokeMethod();
 
            }
        }
    }
 
    public static void aroundAdvice(Object target,String methodName,Object... params){
        Class cls=target.getClass();
        Method[] methods=cls.getDeclaredMethods();
        for(int i=0;i<methods.length;i++){
            if(methods[i].getName().equals(methodName)){
                rfBefore.invokeMethod();
                new ReflectUtils(target,methodName,params).invokeMethod();
                rfAfter.invokeMethod();
 
            }
        }
    }
 
}

----------------------------------准备测试所需要的接口 类----------------------------------
/**
 * 要被拦截的接口
 * @author scipio
 * @created 2013-10-21
 */
public interface Crud {
    public void add(String user);
    public void modify(String user);
    public void delete(String user);
}
 
/**
 * 要被拦截的接口的实现类
 * @author scipio
 * @created 2013-10-21
 */
public class CrudImpl implements Crud {
    @Override
    public void add(String user) {
        System.out.println("new user:");
    }
 
    @Override
    public void modify(String user) {
         System.out.println("modify user");
    }
 
    @Override
    public void delete(String user) {
        System.out.println("delete user");
    }
}

-----------------------------------------测试----------------------------------------------
public class Test {
    public static void main(String[] args){
        Crud crud=new CrudImpl();
        Aop.beforeAdvice(crud,"modify","persia"); //类对象 要被拦截(调用)的方法名 该方法所    

                        需要的参数值(参数是需要先后顺序的 所以        

                    这里要注意)
    }
}