Spring的《XML显式装配bean》-利用AOP记录日志？

深碍√TFBOYSˉ_ 2022-07-11 08:48 101阅读 0赞

> 这篇blog主要是介绍利用AOP 记录日志信息，以用户登录为例

（1）domain  
User类：用户这里我们比较简单，只记录id和name

package spring.ch1.topic8;
    
    /** * Created by louyuting on 17/1/20. */
    public class User { 
        private String name = "";
    
        private int id = 0;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public int getId() {
            return id;
        }
    
        public void setId(int id) {
            this.id = id;
        }
    }

登录实现类：主要打印一下登录的信息。

package spring.ch1.topic8;
    
    /** * Created by louyuting on 17/1/20. */
    public class LoginServiceImpl { 
        public void login(User user) {
            if (user != null) {
                System.out.println(user.getName() + " login");
            }
        }
    }

日志类：Log

package spring.ch1.topic8;
    
    import org.aspectj.lang.JoinPoint;
    
    /** * Created by louyuting on 17/1/20. */
    public class Log8 { 
        public void before() {
            System.out.println("before login");
        }
    
        public void after(JoinPoint joinpoint) {
            Object[] objects = joinpoint.getArgs();
            for (int i = 0; i < objects.length; i++) {
                User user = (User) objects[i];
                System.out.println("save login log:" + user.getName() + " login");
            }
        }
    }

日志这里我们需要记录两个东西，一个在登录这个动作之前做的，一个是登录日志之后记录登录日志的操作，这里需要有一个注意的地方：  
  
就是这里面的方法，可以带参数或者无参,而我们的数据流将可以通过JoinPoint这个类来获得.

（2）配置类

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsd 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">
        <bean id="user" class="spring.ch1.topic8.User">
            <property name="id" value="1"/>
            <property name="name" value="jack"/>
        </bean>
    
        <bean id="loginServiceImpl" class="spring.ch1.topic8.LoginServiceImpl"/>
    
        <bean id="log" class="spring.ch1.topic8.Log8">
        </bean>
    
        <aop:config>
            <aop:aspect ref="log">
                <aop:pointcut id="logPointcut" expression="execution(* spring.ch1.topic8.LoginServiceImpl.*(..))"/>
                <aop:before method="before" pointcut-ref="logPointcut"/>
                <aop:after method="after" pointcut-ref="logPointcut"/>
            </aop:aspect>
        </aop:config>
    
    </beans>

（3）测试类：

package spring.ch1.topic8;
    
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.ApplicationContext;
    import org.springframework.test.context.ContextConfiguration;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    
    /** * Created by louyuting on 17/1/20. * 利用AOP 记录日志 */
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration(locations = {
       "/spring/ch1/topic8/ApplicationContext-test.xml"})
    public class LoginTest { 
        @Autowired
        private ApplicationContext applicationContext;
    
        @Test
        public void testLogin(){
            LoginServiceImpl login = applicationContext.getBean(LoginServiceImpl.class);
            User user = applicationContext.getBean(User.class);
            login.login(user);
        }
    }

(4)输出：

/** before login jack login save login log:jack login */

总结：这一章节主要介绍怎样利用AOP记录日志，以及里面需要注意的JoinPoint，JoinPoint是获取数据流最重要的类。

完整代码的[github地址][github]

[github]: https://github.com/louyuting/nettyRPC/tree/master/Spring/spring/spring/ch1/topic8