spring AOP入门(一)

自定义pointcut,spring自供一个ComposablePointcutpointcut
       他有5个构造方法,现在不过滤类的,只过滤方法的通知

java 代码

ComposablePointcut()
          Create a default ComposablePointcut, with ClassFilter.TRUE and MethodMatcher.TRUE.
ComposablePointcut(ClassFilter classFilter)
          Create a ComposablePointcut for the given ClassFilter, with MethodMatcher.TRUE.
ComposablePointcut(ClassFilter classFilter, MethodMatcher methodMatcher)
          Create a ComposablePointcut for the given ClassFilter and MethodMatcher.
ComposablePointcut(MethodMatcher methodMatcher)
          Create a ComposablePointcut for the given MethodMatcher, with ClassFilter.TRUE.
ComposablePointcut(Pointcut pointcut)
          Create a ComposablePointcut based on the given Pointcut.

要实现在的通知

java 代码

package composablepointcut;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class BeforeAdvice implements MethodBeforeAdvice {


    public void before(Method method, Object[] args, Object target)
            throws Throwable {
        System.out.println("Before method: " + method);
    }

}

目标对象

java 代码

package composablepointcut;

public class Person {
    public String getName(){
        return "java";
    }
    public void  setAge(){
        System.out.println("setAge");
    }
    public String getAddress(){
         return "china";
    }

}

实现staticmethodmatcher接口,实现对setAge() 方法的通知
java 代码

package composablepointcut;

import java.lang.reflect.Method;

import org.springframework.aop.support.StaticMethodMatcher;

class SetAgeMethodMatcher extends StaticMethodMatcher {
    public boolean matches(Method method, Class cls) {
        return "setAge".equals(method.getName());
    }
}

java 代码实现对set开头的 方法的通知

package composablepointcut;

import java.lang.reflect.Method;

import org.springframework.aop.support.StaticMethodMatcher;

class SetterMethodMatcher extends StaticMethodMatcher {

    public boolean matches(Method method, Class cls) {
        return (method.getName().startsWith("set"));
    }

}

java 代码实现对getname() 方法的通知

package composablepointcut;

import java.lang.reflect.Method;

import org.springframework.aop.support.StaticMethodMatcher;


class GetNameMethodMatcher extends StaticMethodMatcher {

        public boolean matches(Method method, Class cls) {
            return (method.getName().startsWith("get"));
        }

    }

创建一个advisor ,使用DefaultPointcutAdvisor

java 代码

Advisor advisor = new DefaultPointcutAdvisor(pc,
                new SimpleBeforeAdvice());

java 代码

package composablepointcut;

import org.springframework.aop.Advisor;
import org.springframework.aop.ClassFilter;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.aop.support.ComposablePointcut;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import aop1.SimpleBeforeAdvice;

public class ComposablePointcutTest {
     private static Person getProxy(ComposablePointcut pc, Person target) {
            Advisor advisor = new DefaultPointcutAdvisor(pc,
                    new SimpleBeforeAdvice());
  // 没用proxyFactoryBean 配制xml麻烦的要死,直接使用proxyfactory
            ProxyFactory pf = new ProxyFactory();
            pf.setTarget(target);
            pf.addAdvisor(advisor);

            return (Person) pf.getProxy();
        }
     private static void runProxy( Person proxy) {
            proxy.getAddress();
            proxy.getName();
            proxy.setAge();
        }
    public static void main(String[] args) {
            Person target = new Person();
           //这里只实现一个过滤setAge方法,可以通compostable.union()组合过滤方法,
           //intersection方法取交集
            ComposablePointcut compostable = new ComposablePointcut(ClassFilter.TRUE,new SetAgeMethodMatcher());
            Person proxy = ComposablePointcutTest.getProxy(compostable, target);
            ComposablePointcutTest.runProxy(proxy);
        }
}

spring还提供一个nameMatchMethodPointcut,使用对方法名的过滤.
 void setMappedName(String mappedName)
          Convenience method when we have only a single method name to match.
 void setMappedNames(String[] mappedNames)
          Set the method names defining methods to match.
可以通过这两个方法实现过滤的通知
还有RegexpMethodPointcut,支持正则表达式过滤通知方法