建日志表

CREATE TABLE `system_log` (
  `id` bigint unsigned NOT NULL AUTO_INCREMENT COMMENT '主键',
  `method_name` varchar(255) COLLATE utf8mb4_general_ci NOT NULL COMMENT '方法名称',
  `url` varchar(50) COLLATE utf8mb4_general_ci NOT NULL COMMENT '路径',
  `request_params` varchar(255) COLLATE utf8mb4_general_ci NOT NULL COMMENT '请求参数',
  `response_result` text COLLATE utf8mb4_general_ci NOT NULL COMMENT '响应结果',
  `cost_time` int NOT NULL COMMENT '执行时间(毫秒)',
  `message` varchar(255) COLLATE utf8mb4_general_ci NOT NULL COMMENT '说明',
  `create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci

实现代码

定义注解

package com.study.systemlog;

import java.lang.annotation.*;

@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface SystemLogAOP {

}

与表对应的实体类

package com.study.systemlog;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
import java.util.Date;

@Data
@TableName("system_log")
public class SystemLog {

    @TableId(value = "id", type = IdType.AUTO)
    private Long id;

    private String methodName;

    private String url;

    private String requestParams;

    private String responseResult;

    private Long costTime;

    private String message;

    private Date createTime;

}

这里我用的是mybatisplus，如果这里的类名不是表名的驼峰命名，就需要加上 @TableName(“system_log”) 这个注解。
比如类名是 SystemLogDB，那么mybatisplus就会把这个类映射到表 system_log_d_b，而不是system_log
@TableId(value = “id”, type = IdType.AUTO) 这个注解指定了ID字段是自增的。若没有这个注解，虽然传入的对象id值为null，但mybatisplus会自动给id分配一个随机值，然后写入数据库。这样就不能依靠数据库实现ID自增。

Mapper 和 Service

package com.study.systemlog;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface SystemLogMapper extends BaseMapper<SystemLog> {}

package com.study.systemlog;

public interface SystemLogService {

    int insertSystemLog(SystemLog systemLog);

}

package com.study.systemlog;

import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.util.Date;

@Service
public class SystemLogServiceImpl implements SystemLogService {

    @Resource
    private SystemLogMapper systemLogMapper;

    @Override
    public int insertSystemLog(SystemLog systemLog) {
        systemLog.setCreateTime(new Date());
        return systemLogMapper.insert(systemLog);
    }

}

实现自定义注解

package com.study.systemlog;

import com.alibaba.fastjson2.JSON;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Service;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import lombok.extern.slf4j.Slf4j;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Map;

@Slf4j
@Aspect
@Service("systemLogAOPService")
public class SystemLogAOPService {

    @Resource
    private SystemLogService systemLogService;

    @Pointcut("@annotation(com.study.systemlog.SystemLogAOP)")
    public void LogPointCut() {}

    @Around("LogPointCut()")
    public Object around(ProceedingJoinPoint point) throws Throwable{
        SystemLog systemLog = new SystemLog();

        // 请求路径
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        assert attributes != null;
        HttpServletRequest request = attributes.getRequest();
        systemLog.setUrl(request.getRequestURI());

        long start = System.currentTimeMillis();

        // 拦截的方法名称。当前正在执行的方法
        String className = point.getTarget().getClass().getName();
        String methodName = point.getSignature().getName();
        systemLog.setMethodName(className + "." + methodName);

        // 拦截的放参数类型
        MethodSignature msig = (MethodSignature)point.getSignature();

        // 拦截的参数
        String[] parameterNames = msig.getParameterNames();
        Object[] args = point.getArgs();
        Map<String, Object> params = generateParams(parameterNames, args);
        systemLog.setRequestParams(JSON.toJSONString(params));

        try {
            // 获得被拦截的方法
            point.getTarget().getClass().getMethod(methodName, msig.getMethod().getParameterTypes());
        } catch (NoSuchMethodException | SecurityException e1) {
            log.error("获取方法异常:" + e1.getMessage());
        }

        // 执行方法返回对象
        Object object = point.proceed();
        try {
            systemLog.setResponseResult(JSON.toJSONString(object));
            systemLog.setCostTime(System.currentTimeMillis() - start);
            systemLog.setMessage("执行成功！");
        } catch (Throwable e) {
            systemLog.setCostTime(System.currentTimeMillis() - start);
            systemLog.setMessage("执行失败!" + e.getMessage());
            log.error("执行方法[" + methodName + "]异常!" + e.getMessage());
        }
        systemLogService.insertSystemLog(systemLog);
        return object;
    }

    private Map<String,Object> generateParams(String[] paramNames, Object[] values){
        Map<String,Object> rs = new HashMap<>();
        for (int i = 0; i < paramNames.length; i++) {
            rs.put(paramNames[i],values[i]);
        }
        return rs;
    }

}

需要导入的依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-aop</artifactId>
    <version>${spring-boot.version}</version>
</dependency>

为了方便，所有类都在同一层目录，也就是同一个包。

使用注解

将注解标在需要记录日志的方法上，就能实现日志功能。

@SystemLogAOP
@GetMapping("/{id}")
public AjaxResult get(@PathVariable Long id) {
    return studentService.selectStudentById(id);
}

实现效果