Spring - Aop简单的mvc示例 和 Aop注解的使用

1.简单的mvc示例

    场景描述 ： 在mvc中，异常处理十分重要，在这里使用aop实现service层异常的全局捕获；

    分析 ： 目标类是 ：serviceImpl 

                 切面 ：自定义MyException 捕获类

   （1）Dao层实现

public interface UserDao {
       void addUser() throws Exception;  
}

     接口实现 ： 在这里我们模拟抛出异常；

package cn.labelnet.dao.impl;

import cn.labelnet.dao.UserDao;

public class UserDaoImpl implements UserDao {

	@Override
	public void addUser() throws Exception{
		
        System.out.println("添加用户");
        
        //模拟出错
        throw new RuntimeException("我是异常");
	}

}

   （2）service 层 

public interface UserService {

	 void userAdd() throws Exception;
}

     接口实现 ： 这是我们的目标类，捕获service中的异常信息

public class UserServiceImp implements UserService{

	private UserDao userDao;
	
	public UserDao getUserDao() {
		return userDao;
	}

	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}

	@Override
	public void userAdd() throws Exception {
        	userDao.addUser();
	}
	
}

  （3）Action层

          用来进行测试使用；

public class UserAction {
	
	private UserService userService;
	
	public UserService getUserService() {
		return userService;
	}

	public void setUserService(UserService userService) {
		this.userService = userService;
	}


	public void userAction() throws Exception{
         userService.userAdd();		
	}

}

   （4）自定义异常捕获类

            切面；

public class MvcException {

	//异常拦截
	public void exceptionInterception(Throwable xe){
		System.out.println("异常拦截: "+xe.getMessage());
	}
	
}

重点）

<?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"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
	http://www.springframework.org/schema/aop 
	http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">

   <bean id="user_Dao" class="cn.labelnet.dao.impl.UserDaoImpl"></bean>
   
   <!-- 目标类 -->
   <bean id="user_Service" class="cn.labelnet.service.impl.UserServiceImp">
      <property name="userDao" ref="user_Dao"></property>
   </bean>
   
   <bean id="userAction" class="cn.labelnet.action.UserAction">
      <property name="userService">
              <ref bean="user_Service" />
      </property>
   </bean>
   
   <!-- 切面 -->
   <bean id="myexception" class="cn.labelnet.exception.MvcException"></bean>
   
   <aop:config>
       <!-- 切入点 -->
       <aop:pointcut expression="execution(* cn.labelnet.service.impl.*.*(..))" id="perform"/>
       
       
       <aop:aspect ref="myexception">

方法名对应切面中的方法，throwing对应方法中的参数名一样，pointcut-ref：目标类的切入点
          <aop:after-throwing method="exceptionInterception" throwing="xe"  pointcut-ref="perform"  />
       </aop:aspect>
       
   </aop:config>
  

</beans>

    （6）测试

@Test
	public void test() throws Exception {
		
		ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
		UserAction userAction= (UserAction) context.getBean("userAction");
		userAction.userAction();
		
	}

    （7）Demo下载

 

2.Aop注解示例

        ICO和DI的实现也是采用注解的方式实现；

     （1）Dao层实现

 

public interface UserDao {
       void addUser() throws Exception;  
}

    接口实现 : 模拟异常抛出

import org.springframework.stereotype.Repository;


@Repository("userDao")
public class UserDaoImpl implements UserDao {

	@Override
	public void addUser() throws Exception{
		
        System.out.println("添加用户");
//        //模拟出错
        throw new RuntimeException("我是异常");
	}

}

    （2）Service层实现

 

public interface UserService {

	 void userAdd() throws Exception;
}

        接口实现 ：目标类】

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

@Service("userService")
public class UserServiceImp implements UserService{

	@Resource(name="userDao")
	private UserDao userDao;

	@Override
	public void userAdd() throws Exception {
        	userDao.addUser();
	}
}

    （3）Action 

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;

@Controller("userAction")
public class UserAction {
	
	@Resource(name="userService")
	private UserService userService;
	
	public void userAction() throws Exception{
         userService.userAdd();		
	}

}

重点）

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

@Component("myexception")
@Aspect //配置aop
public class MvcException {

//配置切入点

@Pointcut("execution(* cn.labelnet.action.UserServiceImp.*(..))")
	private void expoint(){} //方法签名，最好是私有的，返回值为void
	
	//异常拦截
	@AfterThrowing(pointcut="expoint()",throwing="xe")
	public void exceptionInterception(Throwable xe){
		System.out.println("异常拦截: "+xe.getMessage());
	}
	
}

     （5）配置实现 

          1）导入context命名空间 ，导入aop命名空间

          2）实现配置

<?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-3.0.xsd 
	http://www.springframework.org/schema/aop 
	http://www.springframework.org/schema/aop/spring-aop-2.5.xsd 
	http://www.springframework.org/schema/context  
    http://www.springframework.org/schema/context/spring-context-2.5.xsd">


	<context:annotation-config />

	<bean id="userDao" class="cn.labelnet.action.UserDaoImpl"></bean>

	<!-- 目标类 -->
	<bean id="userService" class="cn.labelnet.action.UserServiceImp">
	</bean>

	<bean id="userAction" class="cn.labelnet.action.UserAction">
	</bean>

	<!-- 切面 -->
	<bean id="myexception" class="cn.labelnet.action.MvcException"></bean>
	
	
	<!-- aop的配置实现 -->
	<aop:aspectj-autoproxy></aop:aspectj-autoproxy>

</beans>

     （6）测试

@Test
	public void test() throws Exception {
		
		ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
		UserAction userAction= (UserAction) context.getBean("userAction");
		userAction.userAction();
		
	}

    （7）一个异常问题

         

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDao' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: error at ::0 can't find referenced pointcut expoint
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
	at cn.labelnet.action.TestMvc.test(TestMvc.java:14)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.IllegalArgumentException: error at ::0 can't find referenced pointcut expoint
	at org.aspectj.weaver.tools.PointcutParser.parsePointcutExpression(PointcutParser.java:316)
	at org.springframework.aop.aspectj.AspectJExpressionPointcut.buildPointcutExpression(AspectJExpressionPointcut.java:205)
	at org.springframework.aop.aspectj.AspectJExpressionPointcut.checkReadyToMatch(AspectJExpressionPointcut.java:192)
	at org.springframework.aop.aspectj.AspectJExpressionPointcut.getClassFilter(AspectJExpressionPointcut.java:173)
	at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:198)
	at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:253)
	at org.springframework.aop.support.AopUtils.findAdvisorsThatCanApply(AopUtils.java:287)
	at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findAdvisorsThatCanApply(AbstractAdvisorAutoProxyCreator.java:113)
	at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findEligibleAdvisors(AbstractAdvisorAutoProxyCreator.java:85)
	at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.getAdvicesAndAdvisorsForBean(AbstractAdvisorAutoProxyCreator.java:66)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:360)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:324)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:407)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1426)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
	... 34 more

      上面的是报的一个错误，很纠结的不知道为何报这个错误，重点就是 ：

Caused by: java.lang.IllegalArgumentException: error at ::0 can't find referenced pointcut expoint

     错误，后通过查询，说aop的jar要对应jdk的版本，才可以，也就是我的aop包是1.6的对应1.6的jdk才可以，哎，再一次发现这么纠结的问题；

 

     jdk 1.7 的 aop 包 下载

     （8）demo免积分下载 

3.总结

   学到这里spring基础知识应该就完了，下面开始讲spring和mybatis进行整合使用；

   spring配置总包下载