Spring-AOP简单实现方式
2024-09-04 07:57:14
AOP的专业术语:
1、创建Maven管理项目:
pom.xml导入依赖
<properties>
<!-- springframe 版本控制 -->
<spring.version>4.1.1.RELEASE</spring.version>
</properties>
<dependencies>
<!-- 允许创建jsp页面 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<!-- jsp页面标签 -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- jsp API -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<!-- servlet Api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
<!-- springframe start -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-oxm</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- springframe end --> <!--mysql数据库驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<!--log4j日志包 -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.6.1</version>
</dependency>
<!-- JUnit单元测试工具 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
</dependency>
<!-- aspectJ AOP 织入器 -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.9</version>
</dependency>
<!-- jstl -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
2、创建目标对象
com.service.UserService.java(j接口)、com.service.impl.UserServiceImpl.java(实现类)
package com.service; public interface UserService {
void save();
void update();
void delete();
void select();
}
package com.service.impl; import com.service.UserService;
public class UserServiceImpl implements UserService { @Override
public void save() {
System.out.println("保存成功"); } @Override
public void update() {
System.out.println("更新成功"); } @Override
public void delete() {
//int i=9/0;
System.out.println("删除成功"); } @Override
public void select() {
System.out.println("查询成功"); } }
3、创建Transaction-advice类(事务同通知类)
com.transactionAdvice.transactionAdvice.java
package com.transactionAdvice; import java.io.Serializable; import org.aspectj.lang.ProceedingJoinPoint;
public class transactionAdvice{
public transactionAdvice() {}
public void before() {
System.out.println("before-->前置通知");
}
public void after() {
System.out.println("after-->后置通知(无论是否出现异常都执行)");
}
//可以用于commit
public void afterReturning() {
System.out.println("afterReturning-->后置通知(出现异常不会执行)");
}
//可以用于rollback
public void throwingException() {
System.out.println("throwingException-->出现异常时执行!");
}
public Object around(ProceedingJoinPoint point) throws Throwable {
System.out.println("around-before");
Object object=point.proceed();
System.out.println("around-after");
return object;
}
}
4、配置applicationContext.xml
注意:execution(* com.service..*ServiceImpl.*(..)),这是一个execution()表达式,第一个*表示方法的任意返回值,*ServiceImpl表示只要是ServiceImpl后缀的类,*(..)便是任意方法,任意方法里面的可以有任意形参。
整句话的意思是:com.service下的全部子包下的,后缀带有(ServiceImpl)的全部类,类下面的全部方法(如果去掉“(..)”里面的两个点,则表示不带形参的方法),方法下的任意返回值都是切入点。
eg: execution(public void com.service.impl.UserServiceImpl.delete()) ,就特指com.service.impl.UserServiceImpl下的delete()方法,返回值是void
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd">
<!-- 实现类Bean -->
<bean id="userService" class="com.service.impl.UserServiceImpl" />
<!-- 事务通知类Bean -->
<bean id="TransactionAdvice" class="com.transactionAdvice.transactionAdvice" />
<aop:config>
<!-- 设置切入点 -->
<aop:pointcut expression="execution(* com.service..*ServiceImpl.*(..))" id="pointcut" />
<!-- 将通知织入到相对应的切入点中 -->
<aop:aspect ref="TransactionAdvice">
<aop:before method="before" pointcut-ref="pointcut"/>
<aop:after method="after" pointcut-ref="pointcut"/>
<aop:after-returning method="afterReturning" pointcut-ref="pointcut"/>
<aop:after-throwing method="throwingException" pointcut-ref="pointcut"/>
<aop:around method="around" pointcut-ref="pointcut"/>
</aop:aspect>
</aop:config>
<!-- 依赖注入的时候允许注入给实现类,而非强制是接口 -->
<aop:aspectj-autoproxy proxy-target-class="true"/>
</beans>
5、测试用例
package Junit; import javax.annotation.Resource; import org.junit.Test;
import org.junit.runner.RunWith; import com.service.UserService;
import com.service.impl.UserServiceImpl; import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; @RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("/applicationContext.xml")
public class AopTest {
@Resource(name="userService")
private UserService us;
@Test
public void AopTest() {
us.delete();
}
}
效果:
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