项目组织结构如下:
一、pom依赖:
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.zl</groupId>
<artifactId>spring_day03_aop_xml</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.13</version>
</dependency>
</dependencies>
</project>
二、Service层:
com.zl.service.AccountService
接口:
package com.zl.service;
public interface AccountService {
/**
* 模拟保存账户
*/
void saveAccount();
/**
* 模拟更新账户
* @param i
*/
void updateAccount(int i);
/**
* 删除账户
* @return
*/
int deleteAccount();
}
com.zl.service.AccountServiceImpl
实现类:
package com.zl.service.impl;
import com.zl.service.AccountService;
@Service("accountService")
public class AccountServiceImpl implements AccountService {
@Override
public void saveAccount() {
System.out.println("执行了保存");
// int i = 1/0;
}
@Override
public void updateAccount(int i) {
System.out.println("执行了更新"+i);
}
@Override
public int deleteAccount() {
System.out.println("执行了删除");
return 0;
}
}
三、日志通知类:
com.zl.util.Logger
日志通知类:
package com.zl.utils;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
@Component("logger")
@Aspect
public class Logger {
@Pointcut("execution(* com.zl.service.impl.*.*(..))")
private void pt1(){
}
/**
* 前置通知
*/
// @Before("pt1()")
public void beforePrintLog(){
System.out.println("Logger类中的beforePrintLog方法执行了....前置通知");
}
/**
* 后置通知
*/
// @AfterReturning("pt1()")
public void afterReturningPrintLog(){
System.out.println("Logger类中的afterReturningPrintLog方法执行了....后置通知");
}
/**
* 异常通知
*/
// @AfterThrowing("pt1()")
public void afterThrowingPrintLog(){
System.out.println("Logger类中的afterThrowingPrintLog方法执行了....异常通知");
}
/**
* 最终通知
*/
// @After("pt1()")
public void afterPrintLog(){
System.out.println("Logger类中的afterPrintLog方法执行了....最终通知");
}
/**
* 环绕通知
* @return
*/
@Around("pt1()")
public Object aroundPrintLog(ProceedingJoinPoint pjp){
Object[] args = pjp.getArgs();
try {
System.out.println("Logger类中的aroundPrintLog方法执行了....前置通知");
Object obj = pjp.proceed(args);
System.out.println("Logger类中的aroundPrintLog方法执行了....后置通知");
return obj;
} catch (Throwable throwable) {
System.out.println("Logger类中的aroundPrintLog方法执行了....异常通知");
throwable.printStackTrace();
}finally {
System.out.println("Logger类中的aroundPrintLog方法执行了....最终通知");
}
return null;
}
}
四、AOP主配置文件:
resources.bean.xml
:
<?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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!--设置要扫描的包-->
<context:component-scan base-package="com.zl"></context:component-scan>
<!--开启注解-->
<aop:aspectj-autoproxy></aop:aspectj-autoproxy>
</beans>
需要注意的是:
1)当我们使用环绕通知
时,其他四个通知无法使用,否则反之。
2)当我们不使用环绕通知
时,spring自带通知的执行顺序为前置通知
-->最终通知
-->后置/异常通知
,也就是说最终通知
在后置通知
和异常通知
之前执行,是错误的,我们需要注意。
五、测试类:
import com.zl.service.AccountService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestAop {
public static void main(String[] args) {
ApplicationContext app = new ClassPathXmlApplicationContext("bean.xml");
AccountService accountService = app.getBean("accountService", AccountService.class);
accountService.saveAccount();
}
}
六、使用纯注解:
当我们完全不使用xml配置时,需要用到一个新注解@EnableAspectJAutoProxy
@Configuration
@ComponentScan(basePackages="com.zl")
@EnableAspectJAutoProxy
public class SpringConfiguration {
}
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