spring AOP

1. 通过xml实现AOP

beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
        <aop:aspectj-autoproxy/> 
        <bean id="personService" class="cn.sjtu.service.impl.PersonServiceBean"></bean>
        <bean id="aspetbean" class="cn.sjtu.service.MyInterceptor"/>
        <aop:config>
            <aop:aspect id="asp" ref="aspetbean">
                <aop:pointcut id="mycut" expression="execution(* cn.itcast.service..*.*(..))"/>
                <aop:before pointcut-ref="mycut" method="doAccessCheck"/>
                <aop:after-returning pointcut-ref="mycut" method="doAfterReturning"/>
                <aop:after-throwing pointcut-ref="mycut" method="doAfterThrowing"/>
                <aop:after pointcut-ref="mycut" method="doAfter"/>
                <aop:around pointcut-ref="mycut" method="doBasicProfiling"/>
            </aop:aspect>
        </aop:config>
</beans>

MyInterceptor.java

package cn.sjtu.service;

import org.aspectj.lang.ProceedingJoinPoint;
/** * 切面 * */
public class MyInterceptor {    
    public void doAccessCheck() {
        System.out.println("前置通知");
    }

    public void doAfterReturning() {
        System.out.println("后置通知");
    }

    public void doAfter() {
        System.out.println("最终通知");
    }

    public void doAfterThrowing() {
        System.out.println("例外通知");
    }

    public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable {
        System.out.println("进入方法");
        Object result = pjp.proceed();
        System.out.println("退出方法");
        return result;
    }

}

PersonService.java

package cn.sjtu.service;

public interface PersonService {
    public void save(String name);
    public void update(String name, Integer id);
    public String getPersonName(Integer id);
}

PersonServiceBean.java

package cn.sjtu.service.impl;

import cn.sjtu.service.PersonService;

public class PersonServiceBean implements PersonService {

    public String getPersonName(Integer id) {
        System.out.println("我是getPersonName()方法");
        return "xxx";
    }

    public void save(String name) {
        //throw new RuntimeException("我爱例外");
        System.out.println("我是save()方法");
    }

    public void update(String name, Integer id) {
        System.out.println("我是update()方法");
    }

}

SpringAOPTest.java

package junit.test;


import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.sjtu.service.PersonService;

public class SpringAOPTest {

    @Test public void interceptorTest(){
        ApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml");
        PersonService personService = (PersonService)cxt.getBean("personService");
        personService.getPersonName(2);
    }
}

2. 通过注解实现AOP

beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
        <aop:aspectj-autoproxy/> 
        <bean id="myInterceptor" class="cn.sjtu.service.MyInterceptor"/>
        <bean id="personService" class="cn.sjtu.service.impl.PersonServiceBean"></bean>
</beans>

MyInterceptor.java

package cn.sjtu.service;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
/** * 切面 * */
@Aspect
public class MyInterceptor {
    @Pointcut("execution (* cn.itcast.service.impl.PersonServiceBean.*(..))")
    private void anyMethod() {}//声明一个切入点

    @Before("anyMethod() && args(name)")
    public void doAccessCheck(String name) {
        System.out.println("前置通知:"+ name);
    }
    @AfterReturning(pointcut="anyMethod()",returning="result")
    public void doAfterReturning(String result) {
        System.out.println("后置通知:"+ result);
    }
    @After("anyMethod()")
    public void doAfter() {
        System.out.println("最终通知");
    }
    @AfterThrowing(pointcut="anyMethod()",throwing="e")
    public void doAfterThrowing(Exception e) {
        System.out.println("例外通知:"+ e);
    }

    @Around("anyMethod()")
    public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable {
        //if(){//判断用户是否在权限
        System.out.println("进入方法");
        Object result = pjp.proceed();
        System.out.println("退出方法");
        //}
        return result;
    }

}

PersonService.java

package cn.sjtu.service;

public interface PersonService {
    public void save(String name);
    public void update(String name, Integer id);
    public String getPersonName(Integer id);
}

PersonServiceBean.java

package cn.sjtu.service.impl;

import cn.sjtu.service.PersonService;

public class PersonServiceBean implements PersonService {

    public String getPersonName(Integer id) {
        System.out.println("我是getPersonName()方法");
        return "xxx";
    }

    public void save(String name) {
        throw new RuntimeException("我爱例外");
        //System.out.println("我是save()方法");
    }

    public void update(String name, Integer id) {
        System.out.println("我是update()方法");
    }

}

SpringAOPTest.java

package junit.test;


import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.sjtu.service.PersonService;

public class SpringAOPTest {

    /*@BeforeClass public static void setUpBeforeClass() throws Exception { }*/

    @Test public void interceptorTest(){
        ApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml");
        PersonService personService = (PersonService)cxt.getBean("personService");
        personService.save("xx");
    }
}