本篇內(nèi)容介紹了“Spring怎么實(shí)現(xiàn)AOP添加日志記錄功能”的有關(guān)知識(shí),在實(shí)際案例的操作過程中,不少人都會(huì)遇到這樣的困境,接下來就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
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需求,在調(diào)用業(yè)務(wù)方法的時(shí)候,在被調(diào)用的業(yè)務(wù)方法的前面和后面添加上日志記錄功能
整體架構(gòu):
日志處理類:
package aop;import java.util.Arrays;import org.apache.log4j.Logger;import org.aspectj.lang.JoinPoint;//日志處理類 增強(qiáng)處理類-日志public class UserServiceLogger { private Logger logger = Logger.getLogger(UserServiceLogger.class); // 前置增強(qiáng) public void before(JoinPoint joinPoint) { logger.info("調(diào)用" + joinPoint.getTarget() + "的" + joinPoint.getSignature() + "方法,方法參數(shù)是:" + Arrays.toString(joinPoint.getArgs())); } // 后置增強(qiáng) public void afterReturning(JoinPoint joinPoint,Object result) { logger.info("調(diào)用" + joinPoint.getTarget() + "的" + joinPoint.getSignature() + "方法,方法的返回值是:" +result); }}
下面是一個(gè)三層架構(gòu)模式: package dao;import entity.User;/** * 增加DAO接口,定義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;/** * 用戶DAO類,實(shí)現(xiàn)IDao接口,負(fù)責(zé)User類的持久化操作 */public class UserDaoImpl implements UserDao { public void save(User user) { // 這里并未實(shí)現(xiàn)完整的數(shù)據(jù)庫操作,僅為說明問題 System.out.println("保存用戶信息到數(shù)據(jù)庫"); }}
package entity;/** * 用戶實(shí)體類 */public class User implements java.io.Serializable { private Integer id; // 用戶ID private String username; // 用戶名 private String password; // 密碼 private String email; // 電子郵件 // 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;/** * 用戶業(yè)務(wù)接口,定義了所需的業(yè)務(wù)方法 */public interface UserService { public void addNewUser(User user);}
package service.impl;import service.UserService;import dao.UserDao;import entity.User;/** * 用戶業(yè)務(wù)類,實(shí)現(xiàn)對(duì)User功能的業(yè)務(wù)管理 */public class UserServiceImpl implements UserService { // 聲明接口類型的引用,和具體實(shí)現(xiàn)類解耦合 private UserDao dao; // dao 屬性的setter訪問器,會(huì)被Spring調(diào)用,實(shí)現(xiàn)設(shè)值注入 public void setDao(UserDao dao) { this.dao = dao; } public void addNewUser(User user) { // 調(diào)用用戶DAO的方法保存用戶信息 dao.save(user); }}
編寫單元測(cè)試方法: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> <!-- 聲明增強(qiáng)方法所在的Bean --> <bean id="theLogger" class="aop.UserServiceLogger"></bean> <!-- 配置切面 --> <aop:config> <!-- 定義切入點(diǎn) --> <aop:pointcut id="pointcut" expression="execution(public void addNewUser(entity.User))" /> <!-- 引用包含增強(qiáng)方法的Bean --> <aop:aspect ref="theLogger"> <!-- 將before()方法定義為前置增強(qiáng)并引用pointcut切入點(diǎn) --> <aop:before method="before" pointcut-ref="pointcut"></aop:before> <!-- 將afterReturning()方法定義為后置增強(qiáng)并引用pointcut切入點(diǎn) --> <!-- 通過returning屬性指定為名為result的參數(shù)注入返回值 --> <aop:after-returning method="afterReturning" pointcut-ref="pointcut" returning="result" /> </aop:aspect> </aop:config></beans>
運(yùn)行結(jié)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 -調(diào)用service.impl.UserServiceImpl@3c130745的void service.UserService.addNewUser(User)方法,方法參數(shù)是:[entity.User@2e4b8173]保存用戶信息到數(shù)據(jù)庫12-29 15:13:06[INFO]aop.UserServiceLogger -調(diào)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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