由于之前有网友提出Aop的使用的问题,我们这一章节来讨论一下利用AOP记录日志。
我们下面将以用户登录为例子
1.domain
User类:
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_8;
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;
}
}
用户这里我们比较简单,只记录id和name
登录实现类:
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_8;
public class LoginServiceImpl {
public void login(User user) {
if (user != null) {
System.out.println(user.getName() + " login");
}
}
}
登录实现类主要打印一下登录的信息。
日志类:
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_8;
import org.aspectj.lang.JoinPoint;
public class Log {
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.测试类:
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_8;
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;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {
"/com/raylee/my_new_spring/my_new_spring/ch01/topic_1_8/ApplicationContext-test.xml" })
public class LoginTest {
@Autowired
private ApplicationContext applicationContext;
@Test
public void testLogin() {
LoginServiceImpl loginServiceImpl = applicationContext.getBean(LoginServiceImpl.class);
User user = applicationContext.getBean(User.class);
loginServiceImpl.login(user);
}
}
只是简单的get那个Bean出来,然后登录一下。
3.配置文件
<?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="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_8.User">
<property name="id" value="1" />
<property name="name" value="jack" />
</bean>
<bean id="loginServiceImpl"
class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_8.LoginServiceImpl" />
<bean id="log"
class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_8.Log" />
<aop:config>
<aop:aspect ref="log">
<aop:pointcut
expression="execution(* com.raylee.my_new_spring.my_new_spring.ch01.topic_1_8.LoginServiceImpl.*(..))"
id="logPointcut" />
<aop:before method="before" pointcut-ref="logPointcut" />
<aop:after method="after" pointcut-ref="logPointcut" />
</aop:aspect>
</aop:config>
</beans>
配置文件跟之前的aop那一章节的基本一样。
测试输出:
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。
目录:http://blog.youkuaiyun.com/raylee2007/article/details/50611627
我的github:https://github.com/raylee2015/my_new_spring