Spring AOP示例(注解方式)

旭龙 2011-12-06

展开全文

Spring AOP示例

一.使用Annotation
1.定义切面
package com.yyj.aspect;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Component
@Aspect
public class TestAspect {

@Pointcut("execution(* com.yyj.service.*.*(..))")
public void testPointCut(){
}
}
注： @Aspect说明该类是个切面，@Component将该bean自动注入到springIOC容器，
默认id为类名第一个字母转小写；
@Pointcut("execution(* com.yyj.service.*.*(..))")定义一个切入点，
后面的表达式说明对com.yyj.service包及子包下的所有方法进行拦截，植入其它操作，
其它操作由对应的Advise定义。
2.定义advise
package com.yyj.aspect;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class TestAdvise {

@Before("com.yyj.aspect.TestAspect.testPointCut()")
private void testBefore(){
  System.out.println("begin-----in-----");
  System.out.println("before test...");
  System.out.println("end -----in-----");
}
}
注： @Before("com.yyj.aspect.TestAspect.testPointCut()")，定义了testPointCut这个切入点
要做的操作是在执行被切入方法之前先执行testBefore方法。
3.配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www./schema/beans"
xmlns:xsi="http://www./2001/XMLSchema-instance"
xmlns:aop="http://www./schema/aop"
xmlns:context="http://www./schema/context"
xmlns:jee="http://www./schema/jee"
xmlns:lang="http://www./schema/lang"
xmlns:tx="http://www./schema/tx"
xmlns:util="http://www./schema/util"
xsi:schemaLocation="http://www./schema/beans http://www./schema/beans/spring-beans-3.0.xsd
  http://www./schema/aop http://www./schema/aop/spring-aop-3.0.xsd
  http://www./schema/context http://www./schema/context/spring-context-3.0.xsd
  http://www./schema/jee http://www./schema/jee/spring-jee-3.0.xsd
  http://www./schema/lang http://www./schema/lang/spring-lang-3.0.xsd
  http://www./schema/tx http://www./schema/tx/spring-tx-3.0.xsd
  http://www./schema/util http://www./schema/util/spring-util-3.0.xsd">

<aop:aspectj-autoproxy/>

<context:component-scan base-package="com.yyj" />
</beans>

4.定义测试类
package com.yyj.service;
import org.springframework.stereotype.Component;

@Component
public class Testa{
public void test(){
System.out.println("test...");
}
}

import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.yyj.service.Testa;

public class MainTest {

private static ClassPathXmlApplicationContext springCtx;

synchronized static void startup() {
  if (springCtx == null) {
   System.out.println("start up...");
   springCtx = new ClassPathXmlApplicationContext();
   springCtx
     .setConfigLocations(new String[] { "applicationContext.xml" });
   springCtx.refresh();
   Testa ta = (Testa)springCtx.getBean("testa");
   ta.test();
   System.out.println("start up...ok");
  }
}

public static void main(String[] args) {
new MainTest().startup();
}
}

二.不使用Annotation注解也可以如下类似配置
<aop:aspectj-autoproxy/>
  
<context:component-scan base-package="com.yyj" />

<aop:config>
  <aop:aspect ref="myPoint">
   <aop:pointcut expression="execution(* com.yyj.service.FooService.getFoo(..))" id="pointCut"/>
   <aop:before pointcut-ref="pointCut" method="myAroundMethod"/>
  </aop:aspect>
</aop:config>
注：PointCut和Advise可以在一个类中，也可以分开定义

工程用到jar