Spring怎么实现AOP添加日志记录功能
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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:
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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