AOP应用，在用户登录成功后写日志

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1.依赖jar:

2.web.xml 与 applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee                       
	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:applicationContext.xml</param-value>
	</context-param>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
</web-app>

<?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.xsd
                http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
       ">
    <!-- 数据源 -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    	<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
    	<property name="url" value="jdbc:mysql://localhost:3306/ssm"></property>
    	<property name="username" value="root"></property>
    	<property name="password" value="smallming"></property>
    </bean>
    <!-- SqlSessinFactory对象 -->
    <bean id="factory" class="org.mybatis.spring.SqlSessionFactoryBean">
    	<property name="dataSource" ref="dataSource"></property>
    	<property name="typeAliasesPackage" value="com.tao.pojo"></property>
    </bean>
    <!-- 扫描器 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    	<property name="basePackage" value="com.tao.mapper"></property>
    	<property name="sqlSessionFactory" ref="factory"></property>
    </bean>
    
    <!-- 注入 -->
    <bean id="usersService" class="com.tao.service.impl.UsersServiceImpl">
    	<property name="usersMapper" ref="usersMapper"></property>
    </bean>
    
    <!-- aop -->
    <aop:aspectj-autoproxy proxy-target-class="true"></aop:aspectj-autoproxy>
    <bean id="mybefore" class="com.tao.advice.MyBefore"></bean>
    <bean id="myafter" class="com.tao.advice.MyAfter"></bean>
    <aop:config>
    	<aop:pointcut expression="execution(* com.tao.service.impl.UsersServiceImpl.login(..))" id="mypoint"/>
    	<aop:advisor advice-ref="mybefore" pointcut-ref="mypoint"/>
    	<aop:advisor advice-ref="myafter" pointcut-ref="mypoint"/>
    </aop:config>
</beans>

log4j.properties: 

log4j.rootCategory=ERROR, CONSOLE ,LOGFILE

log4j.logger.com.tao.mapper=DEBUG

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%C %p  %m %n

log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=MyBatis.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%C %m %L %n

mapper接口及映射：

package com.tao.mapper;

import com.tao.pojo.Users;

public interface UsersMapper {
	Users selByUsers(Users users);
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.tao.mapper.UsersMapper">
	<select id="selByUsers" parameterType="users" resultType="users">
		select * from users where username=#{username} and password=#{password}
	</select>
</mapper>

service及其实现类：

package com.tao.service;

import com.tao.pojo.Users;

public interface UsersService {
	Users login(Users users);
}

package com.tao.service.impl;

import com.tao.mapper.UsersMapper;
import com.tao.pojo.Users;
import com.tao.service.UsersService;

public class UsersServiceImpl implements UsersService{
	private UsersMapper usersMapper;
	
	public UsersMapper getUsersMapper() {
		return usersMapper;
	}
	public void setUsersMapper(UsersMapper usersMapper) {
		this.usersMapper = usersMapper;
	}
	
	@Override
	public Users login(Users users) {
		return usersMapper.selByUsers(users);
	}

}

servlet:

package com.tao.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.tao.pojo.Users;
import com.tao.service.UsersService;
import com.tao.service.impl.UsersServiceImpl;

@WebServlet("/login")
public class LoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
	private UsersService usersService;
	
	@Override
	public void init() throws ServletException {
		WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
		usersService = wac.getBean("usersService",UsersServiceImpl.class);
	}
	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		Users users = new Users();
		users.setUsername(req.getParameter("username"));
		users.setPassword(req.getParameter("password"));
		Users user = usersService.login(users);
		if(user!=null){
			resp.sendRedirect("main.jsp");
		}else{
			resp.sendRedirect("login.jsp");
		}
	}
}

前置后置处理通知类：

package com.tao.advice;

import java.lang.reflect.Method;
import java.util.Date;

import org.apache.log4j.Logger;
import org.springframework.aop.MethodBeforeAdvice;

import com.tao.pojo.Users;


public class MyBefore implements MethodBeforeAdvice {

	@Override
	public void before(Method arg0, Object[] arg1, Object arg2) throws Throwable {
		Users users = (Users) arg1[0];
		Logger logger = Logger.getLogger(MyBefore.class);
		logger.info(users.getUsername()+"在"+new Date().toLocaleString()+"进行登录");
	}

}

package com.tao.advice;

import java.lang.reflect.Method;

import org.apache.log4j.Logger;
import org.springframework.aop.AfterReturningAdvice;
import com.tao.pojo.Users;


public class MyAfter implements AfterReturningAdvice{
	
	/*
	 * arg0  被通知方法的返回值
	 * arg1 被通知的方法对象
	 * arg2 被通知方法的参数
	 * arg3 被代理的对象
	 */
	@Override
	public void afterReturning(Object arg0, Method arg1, Object[] arg2, Object arg3) throws Throwable {
		Logger logger = Logger.getLogger(MyAfter.class);
		Users users = (Users) arg2[0];
		if(arg0!=null){
			logger.info(users.getUsername()+"登录成功!");
		}else{
			logger.info(users.getUsername()+"登录失败!");
		}
	}

}