您的位置:首页 > 编程语言 > Java开发

SSM-Spring-11:Spring中使用代理工厂Bean实现aop的四种增强

2018-03-08 21:37 465 查看

 

 

------------吾亦无他,唯手熟尔,谦卑若愚,好学若饥-------------

 

 

说说那四种增强:前置增强,后置增强,环绕增强,异常增强

那什么是代理工厂bean呢?

  org.springframework.aop.framework.ProxyFactoryBean

  就是这个东西,他可以实现对方法的增强

 

@No.1:前置增强:

  需要前置增强的类SomeServiceImpl

 

package cn.dawn.day11aop01;

/**
* Created by Dawn on 2018/3/8.
*/
public class SomeServiceImpl {
public void doSome() {
System.out.println("do something");
}
}

 

  前置增强的内容的类,可以说实现前置增强接口的类LoggerBefore

 

package cn.dawn.day11aop01;

import org.springframework.aop.MethodBeforeAdvice;

import java.lang.reflect.Method;

/**
* Created by Dawn on 2018/3/5.
*/
/*前置增强*/
public class LoggerBefore implements MethodBeforeAdvice {
public void before(Method method, Object[] objects, Object o) throws Throwable {
System.out.println("日志记录");
}
}

 

  配置文件中:

 

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--要增强的对象-->
<bean id="service" class="cn.dawn.day11aop01.SomeServiceImpl"></bean>
<!--增强的内容-->
<bean id="before" class="cn.dawn.day11aop01.LoggerBefore"></bean>
<!--代理工厂bean-->
<bean id="proxyfactory" class="org.springframework.aop.framework.ProxyFactoryBean">
<!--要增强的对象-->
<property name="target" ref="service"></property>
<!--增强的内容-->
<property name="interceptorNames" value="before"></property>
</bean>

</beans>

 

  单测方法:

 

package cn.dawn.day11aop01;

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

/**
* Created by Dawn on 2018/3/3.
*/
public class test20180305 {
@Test
/*aop代理工厂bean前置增强*/
public void t01(){
ApplicationContext context=new ClassPathXmlApplicationContext("ApplicationContext-day11aop01.xml");
SomeServiceImpl service = (SomeServiceImpl) context.getBean("proxyfactory");
service.doSome();
}
}

 

 

@No.2:后置增强:

  需要后置增强的类:SomeServiceImpl(此类和前置那个写在不同包下,一会的配置文件也不同,往后都是如此)

 

package cn.dawn.day12aop02;

/**
* Created by Dawn on 2018/3/8.
*/
public class SomeServiceImpl {
public void doSome() {
System.out.println("do something");
}
}

 

  后置增强的内容的的类,他与前置增强的那个实现的接口不同:LoggerAfter

 

package cn.dawn.day12aop02;

import org.springframework.aop.AfterReturningAdvice;

import java.lang.reflect.Method;

/**
* Created by Dawn on 2018/3/5.
*/
/*后置增强*/
public class LoggerAfter implements AfterReturningAdvice {
public void afterReturning(Object o, Method method, Object[] objects, Object o1) throws Throwable {
System.out.println("===============after==================");
}
}

 

  配置文件中:

 

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--要增强的对象-->
<bean id="service" class="cn.dawn.day12aop02.SomeServiceImpl"></bean>
<!--增强的内容-->
<bean id="afteradvice" class="cn.dawn.day12aop02.LoggerAfter"></bean>
<!--代理工厂bean-->
<bean id="proxyfactory" class="org.springframework.aop.framework.ProxyFactoryBean">
<!--要增强的对象-->
<property name="target" ref="service"></property>
<!--增强的内容-->
<property name="interceptorNames" value="afteradvice"></property>
</bean>

</beans>

 

  单测方法:

 

package cn.dawn.day12aop02;

import cn.dawn.day12aop02.SomeServiceImpl;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
* Created by Dawn on 2018/3/3.
*/
public class test20180305 {
@Test
/*aop代理工厂bean后置增强*/
public void t01(){
ApplicationContext context=new ClassPathXmlApplicationContext("ApplicationContext-day12aop02.xml");
SomeServiceImpl service = (SomeServiceImpl) context.getBean("proxyfactory");
service.doSome();
}
}

 

 

@No.3:环绕增强:

  需要环绕增强的类:SomeServiceImpl

 

package cn.dawn.day13aop03;

/**
* Created by Dawn on 2018/3/8.
*/
public class SomeServiceImpl {
public void doSome() {
System.out.println("do something");
}
}

 

  环绕增强内容的:

 

package cn.dawn.day13aop03;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

/**
* Created by Dawn on 2018/3/8.
*/
/*环绕增强需要实现MethodInterceptor这个接口*/
public class MethodAdvice implements MethodInterceptor {
public Object invoke(MethodInvocation methodInvocation) throws Throwable {
System.out.println("前置增强");
/*它可以使前置增强和后置增强分开,同时实现前置和后置*/
methodInvocation.proceed();
System.out.println("后置增强");
return null;
}
}

 

  配置文件:

 

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--要增强的对象-->
<bean id="service" class="cn.dawn.day13aop03.SomeServiceImpl"></bean>
<!--增强的内容-->
<bean id="methodAdvice" class="cn.dawn.day13aop03.MethodAdvice"></bean>
<!--代理工厂bean-->
<bean id="proxyfactory" class="org.springframework.aop.framework.ProxyFactoryBean">
<!--要增强的对象-->
<property name="target" ref="service"></property>
<!--增强的内容-->
<property name="interceptorNames" value="methodAdvice"></property>
</bean>

</beans>

 

  单测方法:

 

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--要增强的对象-->
<bean id="service" class="cn.dawn.day13aop03.SomeServiceImpl"></bean>
<!--增强的内容-->
<bean id="methodAdvice" class="cn.dawn.day13aop03.MethodAdvice"></bean>
<!--代理工厂bean-->
<bean id="proxyfactory" class="org.springframework.aop.framework.ProxyFactoryBean">
<!--要增强的对象-->
<property name="target" ref="service"></property>
<!--增强的内容-->
<property name="interceptorNames" value="methodAdvice"></property>
</bean>

</beans>

 

 

@No.4:异常增强:

  异常增强是主要用在他出错的时候,进行记录用的,此处模拟起来简单的就是除0异常和空指针异常

  写一个类,它里面的方法存在异常,运行时异常

  SomeServiceImpl类

 

package cn.dawn.day14aop04;

/**
* Created by Dawn on 2018/3/8.
*/
public class SomeServiceImpl {
public void doSome() {
System.out.println("do something");
String abc=null;
System.out.println(abc.toString());;
}
}

 

  此处模拟的是空指针异常,当然异常种类很多,不一一模拟了

  实现ThrowsAdvice接口的类

 

package cn.dawn.day14aop04;

import org.springframework.aop.ThrowsAdvice;

/**
* Created by Dawn on 2018/3/8.
*/
public class MyThrowsAdvice implements ThrowsAdvice {
public void afterThrowing(Exception ex){
System.out.println("网络中断XXXXX-错误号05289");
}
}

 

  他这个接口里面没有方法要重写,很是奇怪,那是随便写什么defgabc的都可以吗?不是的,翻他的源码,他在上面的注释里提供了模板,只有按照他模板写的才能读取到,此处我用了他的其中一个模板方法

  配置文件中:

 

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--要增强的对象-->
<bean id="service" class="cn.dawn.day14aop04.SomeServiceImpl"></bean>
<!--增强的内容-->
<bean id="myThrowsAdvice" class="cn.dawn.day14aop04.MyThrowsAdvice"></bean>
<!--代理工厂bean-->
<bean id="proxyfactory" class="org.springframework.aop.framework.ProxyFactoryBean">
<!--要增强的对象-->
<property name="target" ref="service"></property>
<!--增强的内容-->
<property name="interceptorNames" value="myThrowsAdvice"></property>
</bean>

</beans>

 

  单测方法:

 

package cn.dawn.day14aop04;

import cn.dawn.day14aop04.SomeServiceImpl;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
* Created by Dawn on 2018/3/3.
*/
public class test20180305 {
@Test
/*aop代理工厂bean异常增强*/
public void t01(){
ApplicationContext context=new ClassPathXmlApplicationContext("ApplicationContext-day14aop04.xml");
SomeServiceImpl service = (SomeServiceImpl) context.getBean("proxyfactory");
try{
service.doSome();
}catch (Exception ex){
ex.printStackTrace();
}

}
}

 

    看到这儿的try-catch了吧,他的作用是让单测能通过单元测试,能变成对勾,能执行到结束,不会因为模拟的异常而中断   

--------------------------End-------------------------

基于代理工厂Bean实现aop的四种增强总结完毕

 

内容来自用户分享和网络整理,不保证内容的准确性,如有侵权内容,可联系管理员处理 点击这里给我发消息
标签: