Spring AOP示例
一.使用Annotation
1.定義切面
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說明該類是個切面,@Component將該bean自動注入到springIOC容器,
默認id為類名第一個字母轉(zhuǎn)小寫;
@Pointcut("execution(* com.yyj.service.*.*(..))")定義一個切入點,
后面的表達式說明對com.yyj.service包及子包下的所有方法進行攔截,植入其它操作,
其它操作由對應(yīng)的Advise定義。
2.定義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()"),定義了testPointCut這個切入點
要做的操作是在執(zhí)行被切入方法之前先執(zhí)行testBefore方法。
3.配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/jeehttp://www.springframework.org/schema/jee/spring-jee-3.0.xsd
http://www.springframework.org/schema/langhttp://www.springframework.org/schema/lang/spring-lang-3.0.xsd
http://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/util
<aop:aspectj-autoproxy/>
<!-- 啟動Spring注解自動注入Bean -->
<context:component-scan base-package="com.yyj" />
</beans>
4.定義測試類
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注解也可以如下類似配置
<aop:aspectj-autoproxy/>
<!-- 啟動Spring注解 -->
<context:component-scan base-package="com.yyj" />
<!--<tx:annotation-driven proxy-target-class="true" /> -->
<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可以在一個類中,也可以分開定義
工程用到j(luò)ar