这篇文章主要介绍了Spring框架实现AOP添加日志记录功能过程详解,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

需求，在调用业务方法的时候，在被调用的业务方法的前面和后面添加上日志记录功能

整体架构：

日志处理类：

package aop;import java.util.Arrays;import org.apache.log4j.Logger;import org.aspectj.lang.JoinPoint;//日志处理类 增强处理类-日志public class UserServiceLogger { private Logger logger = Logger.getLogger(UserServiceLogger.class); // 前置增强 public void before(JoinPoint joinPoint) { logger.info("调用" + joinPoint.getTarget() + "的" + joinPoint.getSignature() + "方法，方法参数是：" + Arrays.toString(joinPoint.getArgs())); } // 后置增强 public void afterReturning(JoinPoint joinPoint,Object result) { logger.info("调用" + joinPoint.getTarget() + "的" + joinPoint.getSignature() + "方法，方法的返回值是：" +result); }}下面是一个三层架构模式： package dao;import entity.User;/** * 增加DAO接口,定义了所需的持久化方法 */public interface UserDao { public void save(User user);}package dao.impl;import dao.UserDao;import entity.User;/** * 用户DAO类，实现IDao接口，负责User类的持久化操作 */public class UserDaoImpl implements UserDao { public void save(User user) { // 这里并未实现完整的数据库操作，仅为说明问题 System.out.println("保存用户信息到数据库"); }}package entity;/** * 用户实体类 */public class User implements java.io.Serializable { private Integer id; // 用户ID private String username; // 用户名 private String password; // 密码 private String email; // 电子邮件 // getter & setter public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; }}package service;import entity.User;/** * 用户业务接口，定义了所需的业务方法 */public interface UserService { public void addNewUser(User user);}package service.impl;import service.UserService;import dao.UserDao;import entity.User;/** * 用户业务类，实现对User功能的业务管理 */public class UserServiceImpl implements UserService { // 声明接口类型的引用，和具体实现类解耦合 private UserDao dao; // dao 属性的setter访问器，会被Spring调用，实现设值注入 public void setDao(UserDao dao) { this.dao = dao; } public void addNewUser(User user) { // 调用用户DAO的方法保存用户信息 dao.save(user); }}编写单元测试方法：package test;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import service.UserService;import service.impl.UserServiceImpl;import entity.User;public class AopTest { @Test public void aopTest() { ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml"); UserService service = (UserService) ctx.getBean("service"); User user = new User(); user.setId(1); user.setUsername("test"); user.setPassword("123456"); user.setEmail("test@xxx.com"); service.addNewUser(user); }}

applicationContext.xml核心配置文件：

<?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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd"> <bean id="dao" class="dao.impl.UserDaoImpl"></bean> <bean id="service" class="service.impl.UserServiceImpl"> <property name="dao" ref="dao"></property> </bean> <!-- 声明增强方法所在的Bean --> <bean id="theLogger" class="aop.UserServiceLogger"></bean> <!-- 配置切面 --> <aop:config> <!-- 定义切入点 --> <aop:pointcut id="pointcut" expression="execution(public void addNewUser(entity.User))" /> <!-- 引用包含增强方法的Bean --> <aop:aspect ref="theLogger"> <!-- 将before()方法定义为前置增强并引用pointcut切入点 --> <aop:before method="before" pointcut-ref="pointcut"></aop:before> <!-- 将afterReturning()方法定义为后置增强并引用pointcut切入点 --> <!-- 通过returning属性指定为名为result的参数注入返回值 --> <aop:after-returning method="afterReturning" pointcut-ref="pointcut" returning="result" /> </aop:aspect> </aop:config></beans>

运行结果：

12-29 15:13:06[INFO]org.springframework.context.support.ClassPathXmlApplicationContext -Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@2db0f6b2: startup date [Sun Dec 29 15:13:06 CST 2019]; root of context hierarchy12-29 15:13:06[INFO]org.springframework.beans.factory.xml.XmlBeanDefinitionReader -Loading XML bean definitions from class path resource [applicationContext.xml]12-29 15:13:06[INFO]org.springframework.beans.factory.support.DefaultListableBeanFactory -Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@3701eaf6: defining beans [userDao,service,theLogger,org.springframework.aop.config.internalAutoProxyCreator,pointcut,org.springframework.aop.aspectj.AspectJPointcutAdvisor#0,org.springframework.aop.aspectj.AspectJPointcutAdvisor#1]; root of factory hierarchy12-29 15:13:06[INFO]aop.UserServiceLogger -调用service.impl.UserServiceImpl@3c130745的void service.UserService.addNewUser(User)方法，方法参数是：[entity.User@2e4b8173]保存用户信息到数据库12-29 15:13:06[INFO]aop.UserServiceLogger -调用service.impl.UserServiceImpl@3c130745的void service.UserService.addNewUser(User)方法，方法的返回值是：null

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