Spring再学习-Aop(一)

最新推荐文章于 2023-05-23 22:41:16 发布

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#aop #切面编程 #spring

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本文介绍了一个使用 Spring AOP 进行前后置增强的例子。通过定义接口 UserService 和其实现类 UserServiceImpl，结合 Log 和 AfterLog 类实现了方法调用前后的日志记录。配置文件 beans.xml 定义了切面、切入点和通知，展示了如何利用 Spring AOP 将日志功能与业务逻辑分离。

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1. 文件结构

2.pom文件导入包

<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.wyyblog.demo</groupId>
  <artifactId>spring_aop01</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>spring_aop01</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
  
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    
     <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-orm</artifactId>
      <version>4.3.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>4.3.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-core</artifactId>
      <version>4.2.1.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-web</artifactId>
      <version>4.2.1.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-config</artifactId>
      <version>4.2.1.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-ldap</artifactId>
      <version>4.2.1.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-acl</artifactId>
      <version>4.2.1.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-cas</artifactId>
      <version>4.2.1.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-taglibs</artifactId>
      <version>4.2.1.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>4.3.5.RELEASE</version>
    </dependency>
    <!-- aspectjweaver -->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.7.2</version>
    </dependency>
  </dependencies>
</project>

3.后置增强 AfterLog.java

package com.wyyblog.spring_aop.log;

import java.lang.reflect.Method;

import org.springframework.aop.AfterReturningAdvice;

public class AfterLog implements AfterReturningAdvice{

	/**
	 * 目标方法执行后的通知
	 */
	public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
		System.out.println(target.getClass().getName()+"的"+method.getName()+"方法执行之后被调用");
	}
}

4.前置增强 Log.java

package com.wyyblog.spring_aop.log;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class Log implements MethodBeforeAdvice {


	/**
	 * @param method  被调用的方法对象
	 * @param args    被调用的方法参数
	 * @param target  被调用的方法的目标对象
	 */
	public void before(Method method, Object[] args, Object target) 
			throws Throwable {
		System.out.println(target.getClass().getName()+"的"+method.getName()+"方法被调用");
	}
}

5.UserService.java接口

package com.wyyblog.spring_aop.service;

public interface UserService {
	
	public void add();
	public void search();
	public void delete();
	public void update();

}

6.UserServiceImpl.java接口实现

package com.wyyblog.spring_aop.service;

public class UserServiceImpl implements UserService{
	
	public void add() {
		System.out.println("add");
	}
	public void delete() {
		System.out.println("delete");
	}
	public void search() {
		System.out.println("search");
	}
	public void update() {
		System.out.println("update");
	}

}

7.beans.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-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/context
	http://www.springframework.org/schema/context/spring-context-4.0.xsd
	http://www.springframework.org/schema/mvc
	http://www.springframework.org/schema/mvc/spring-mvc.xsd
	http://www.springframework.org/schema/aop
	http://www.springframework.org/schema/aop/spring-aop-4.0.xsd">
	
	
	<bean id="userService" class="com.wyyblog.spring_aop.service.UserServiceImpl"/>
	<bean id="log" class="com.wyyblog.spring_aop.log.Log"/>
	<bean id="afterLog" class="com.wyyblog.spring_aop.log.AfterLog"></bean>
	
	<aop:config>
		<aop:pointcut expression="execution(* com.wyyblog.spring_aop.service.UserServiceImpl.*(..))" id="pointcut"/>
		<aop:advisor advice-ref="log" pointcut-ref="pointcut"/>
		<aop:advisor advice-ref="afterLog" pointcut-ref="pointcut"/>
	</aop:config>
	
	</beans>

8.测试类

package com.wyyblog.spring_aop.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.wyyblog.spring_aop.service.UserService;

public class Test {

	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
		UserService userService = (UserService)context.getBean("userService");
		userService.update();
	}
}