AOP案例

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 定义切面类

package com.itheima.aop;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.itheima.mapper.OperateLogMapper;
import com.itheima.pojo.OperateLog;
import com.itheima.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;


import javax.servlet.http.HttpServletRequest;
import java.time.LocalDateTime;
import java.util.Arrays;

/**
 * @author Mr.jia
 * @version 1.0
 */

@Slf4j
@Component
@Aspect//切面类
public class LogAspect {
    @Autowired(required = false)//该注解不进行检查，服务器启动之后会实例化servlet，这样就不会报错了
    private HttpServletRequest request;

    @Autowired
    private OperateLogMapper operateLogMapper;

    @Around("@annotation(com.itheima.anno.Log)")
    public Object recordLog(ProceedingJoinPoint joinPoint) throws Throwable {
        //操作人ID---当前登录员工ID
        //获取请求头中的jwt令牌，解析令牌
        String jwt = request.getHeader("token");
        Claims claims = JwtUtils.parseJWT(jwt);
        Integer operateUser = (Integer)claims.get("id");


        //操作时间
        LocalDateTime operateTime = LocalDateTime.now();

        //操作类名
        String className = joinPoint.getTarget().getClass().getName();
        //操作方法名
        String methodName = joinPoint.getSignature().getName();
        //操作方法参数
        Object[] args = joinPoint.getArgs();
        String methodParams = Arrays.toString(args);

        long begin = System.currentTimeMillis();
        //调用原始目标方法执行
        Object result = joinPoint.proceed();
        long end = System.currentTimeMillis();

        //方法返回值
        String returnValue = JSONObject.toJSONString(result);
        //操作耗时
        Long costTime = end - begin;

        //记录操作日志
        OperateLog operateLog = new OperateLog(null,operateUser,operateTime,className,methodName,methodParams,returnValue,costTime);
        operateLogMapper.insert(operateLog);
        log.info("AOP记录操作日志：{}",operateLog);
        return result;
    }
}

 实体类

package com.itheima.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.time.LocalDateTime;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class OperateLog {
    private Integer id; //ID
    private Integer operateUser; //操作人ID
    private LocalDateTime operateTime; //操作时间
    private String className; //操作类名
    private String methodName; //操作方法名
    private String methodParams; //操作方法参数
    private String returnValue; //操作方法返回值
    private Long costTime; //操作耗时
}

 自定义注解

package com.itheima.anno;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @author Mr.jia
 * @version 1.0
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Log {

}

package com.itheima.mapper;

import com.itheima.pojo.OperateLog;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface OperateLogMapper {

    //插入日志数据
    @Insert("insert into operate_log (operate_user, operate_time, class_name, method_name, method_params, return_value, cost_time) " +
            "values (#{operateUser}, #{operateTime}, #{className}, #{methodName}, #{methodParams}, #{returnValue}, #{costTime});")
    public void insert(OperateLog log);

}

插入数据库