spring aop的使用（注解方式以及基于xml配置方式）

注解方式

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beans.xml

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<?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="blog.service.MyInterceptor"/>
<bean id="personService" class="blog.service.impl.PersonServiceBean"></bean>

</beans>

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MyInterceptor.java

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package blog.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 (* blog.service.impl.PersonServiceBean.*(..))")
public void anyMethod() {
//表达式解释：* blog.service.impl.PersonServiceBean.*(..):第一个*号表示返回类型；
//blog.service.impl.PersonServiceBean.*：表示PersonServiceBean类下的所有方法
//blog.service.impl..*.*：表示blog.service.impl包及其子包下的所有类的所有方法
//(..):表示所有的参数类型几个数都不限
}// 声明一个切入点

//会拦截参数签名位 (String , int)或(String , Integer )类型的方法，
//参数顺序与args(uname,id)一致，参数类型由(int id,String uname)决定
@Before("anyMethod() && args(uname,id)")
public void doAccessCheck(int id,String uname) {
System.out.println("前置通知:" + uname + id);
}

@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.getMessage());
}

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

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PersonService.java

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package blog.service;

public interface PersonService {
public String save(String name);
public String update(String name,Integer userId);
public String delete(int id,String dept);

}

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PersonServiceBean.java

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package blog.service.impl;

import blog.service.PersonService;

public class PersonServiceBean implements PersonService {
private String username = null;

public String getUsername() {
return username;
}

public PersonServiceBean() {
}

public PersonServiceBean(String username) {
this.username = username;
}

@Override
public String save(String name) {
if (name.equals("") || name == null) {
throw new RuntimeException("出错啦");
}
System.out.println("in save method!" + name);

return "in save method!" + name;
}

@Override
public String update(String name, Integer userId) {
System.out.println("in update method! name = " + name + " id = "
+ userId + " username = " + username);
return "in update method!name = " + name + " id = "	+ userId;
}

@Override
public String delete(int id, String dept) {
System.out.println("id = " + id + " dept = " +  dept);
return "in delete method! + nameid = " + id + " dept = " +  dept;
}

}

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SpringAOPTest.java

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package junitTest;

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

import blog.service.PersonService;

public class SpringAOPTest {

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

@Test
public void AopTest(){
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
PersonService service = (PersonService)ctx.getBean("personService");
try {

service.delete(12, "it");
service.update("发多个地方",324);
service.save("");

} catch (Exception e) {
e.printStackTrace();
}
}

}

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运行结果

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基于xml配置方式



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beans.xml

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<?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="blog.service.MyInterceptor"/>
<bean id="personService" class="blog.service.impl.PersonServiceBean"></bean>

<aop:config>
<aop:aspect id="aspectBean" ref="myInterceptor" >
<aop:pointcut  id="point"  expression="execution (!void blog.service.impl.PersonServiceBean.*(..))"/>
<aop:before method="doAccessCheck" pointcut-ref="point" />
<aop:after-returning method="doAfterReturning" pointcut-ref="point" />
<aop:after-throwing method="doAfterThrowing" pointcut-ref="point"/>
<aop:after method="doAfter" pointcut-ref="point"/>
<aop:around method="doBasicProfiling" pointcut-ref="point" />

</aop:aspect>
</aop:config>

</beans>

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MyInterceptor.java

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package blog.service;

import org.aspectj.lang.ProceedingJoinPoint;

public class MyInterceptor {
public void anyMethod() {
}

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{
//if(){//判断用户是否有权限
System.out.println("进入方法");
Object result = pjp.proceed();
System.out.println("退出方法");
//}
return result;
}
}

aop表达式的使用方法

<aop:pointcut id="point" expression="execution (!void blog.service.impl.PersonServiceBean.*(..))"/>

!void blog.service.impl.PersonServiceBean.*(..)中!void 表示拦截所有返回类型为非void类型的方法

java.lang.String表示拦截所有返回类型为String类型的方法

* blog.service.impl.PersonServiceBean.*(java.lang.String,..)表示拦截所有第一个参数为String类型的方法