AOP实例 – 环绕增强 日志记录

需求：记录图书的service层的日志操作，到数据库

1. 创建商品日志记录表 Book_Log

2. 完成日志记录表的插入逻辑

3. 环绕增强搜集日志记录参数，并测试

4. 环绕增强调用日志记录表的插入逻辑，完成日志记录功能

5. 正常执行目标类的核心代码

注意：需要采用Spring IOC 模式，加载bean

1. 创建实体类：BookLog

2. 书写相应的BookLogDao，BookLogDaoMapper.xml，BookLogService，BookLogServiceImpl，Junit

public interface BookLogDao {

    //新增,入参传实体类名
    public int insertLog(BookLog bookLog);
}

<?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">
        <!--com.nz.dao.BookDao类路径名-->
<mapper namespace="com.nz.dao.BookLogDao">

        <!-- 通用查询映射结果 -->
        <resultMap id="BaseResultMap" type="com.nz.entity.BookLog">
            <id column="id" property="id" />
            <result column="action_class" property="actionClass" />
            <result column="method_name" property="methodName" />
            <result column="args" property="args" />
            <result column="create_date" property="createDate" />
        </resultMap>

        <insert id="insertLog">
            insert into book_log(action_class,method_name,args)
            VALUES(#{actionClass},#{methodName},#{args})
        </insert>
</mapper>

public interface BookLogService {

    //新增
    public boolean addLog(BookLog bookLog);
}

package com.nz.service.impl;

import com.nz.dao.BookLogDao;
import com.nz.entity.Book;
import com.nz.entity.BookLog;
import com.nz.service.BookLogService;
import com.nz.util.MyBatisUtil;
import org.apache.ibatis.session.SqlSession;

/**
 * Created by 86185 on 2023/1/31.
 */
public class BookLogServiceImpl implements BookLogService{


    @Override
    public boolean addLog(BookLog bookLog) {
        //获得sqlSession
        SqlSession sqlSession = MyBatisUtil.getSqlSession();
        //获取dao对象 session 代理
        //BookDao.class就是BookDao的类名
        BookLogDao bookLogDao = sqlSession.getMapper(BookLogDao.class);
        int i = bookLogDao.insertLog(bookLog);
        if(i>0){
            sqlSession.commit();
            return true;
        }
//        关闭session
        MyBatisUtil.close();
        //反参
        return false;
    }
}

 @Test
    public void springMethod5() {
        BookLogService bookLogService = (BookLogService) context.getBean("bookLogService");
        BookLog bookLog = new BookLog();
        bookLog.setActionClass("class");bookLog.setMethodName("name");bookLog.setArgs("args");
        boolean b1 = bookLogService.addLog(bookLog);
        System.out.print(b1);
    }

3.

package com.nz.aop;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

/**
 * Created by 86185 on 2023/1/31.
 */
public class LogInterceptor implements MethodInterceptor{

    @Override
    public Object invoke(MethodInvocation arg0) throws Throwable {
        System.out.print("this is my log interceptor");
        //获取目标方法名
        String methodName = arg0.getMethod().getName();
        //获取目标类名
        String actionClass = arg0.getThis().getClass().toString();
        //获取参数列表
        Object[] arguments = arg0.getArguments();
        //初始化反参
        String args = "";
        for(int i=0;i<arguments.length;i++){
            args = args + arguments[i]+"-";
        }
        //添加日志
        //放行目标代码
        Object object = arg0.proceed();
        return object;
    }
}

4.

public class BookServiceImpl implements BookService {
    @Override
    //注解是放到哪里，哪里生效，注解有切入的功能，绑定了增强功能
    @AnnotationLog
    public boolean addBook(String bookName,String bookAuth,String bookBrief) {
        //获得sqlSession
        SqlSession sqlSession = MyBatisUtil.getSqlSession();
        //获取dao对象 session 代理
        //BookDao.class就是BookDao的类名
        BookDao bookDao = sqlSession.getMapper(BookDao.class);
        int i = bookDao.insertBook(bookName, bookAuth, bookBrief);
        sqlSession.commit();
        return true;
    }

 @Test
    public void springMethod3(){
        BookService bookService = (BookService) context.getBean("bookService");
        boolean b1 = bookService.addBook("bookName", "auth", "brief");
        System.out.print(b1);
    }