今天项目完了,复盘了一下系统,发现还是有一些东西值得拿出来和大家分享一下。需求分析 系统需要对用户的操作进行记录,方便未来溯源 首先想到的就是在每个方法中,去实现记录的逻辑,但是这样做肯定是不现实的,首先工作量大,其次违背了软件工程设计原则(开闭原则) 这种需求显然是对代码进行增强,首先想到的是使用 SpringBoot 提供的 AOP 结合注解的方式来实现 功能实现1、 需要一张记录日志的 Log 表 导出的 sql 如下:-- mcams.t_log definition CREATE TABLE `t_log` ( `log_id` int NOT NULL AUTO_INCREMENT COMMENT "日志编号", `user_id` int NOT NULL COMMENT "操作人id", `operation` varchar(128) NOT NULL COMMENT "用户操作", `method` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT "操作的方法", `params` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT "方法的参数", `ip` varchar(40) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL COMMENT "用户的ip", `create_time` timestamp NULL DEFAULT NULL COMMENT "操作时间", `cost_time` int DEFAULT NULL COMMENT "花费时间", PRIMARY KEY (`log_id`) ) ENGINE=InnoDB AUTO_INCREMENT=189 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;2、我使用的是 Spring Boot 所以需要引入 spring aop 的 starter#如果是使用 spring 框架的,引入 spring-aop 即可 3、Log 实体类#package com.xiaofengstu.mcams.web.entity; import com.baomidou.mybatisplus.annotation.IdType; import com.baomidou.mybatisplus.annotation.TableField; import com.baomidou.mybatisplus.annotation.TableId; import com.baomidou.mybatisplus.annotation.TableName; import java.io.Serializable; import java.time.LocalDateTime; import com.fasterxml.jackson.annotation.JsonFormat; import lombok.Getter; import lombok.Setter; /** * org.springframework.boot spring-boot-starter-aop* * * * @author fengzeng * @since 2022-05-21 */ @Getter @Setter @TableName("t_log") public class TLog implements Serializable { private static final long serialVersionUID = 1L; @TableId(value = "log_id", type = IdType.AUTO) private Integer logId; /** * 操作人id */ @TableField("user_id") private Integer userId; /** * 用户操作 */ @TableField("operation") private String operation; @TableField("method") private String method; @TableField("params") private String params; @TableField("ip") private String ip; @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss") @TableField("create_time") private LocalDateTime createTime; @TableField("cost_time") private Long costTime; } 需要 lombok 插件(@getter && @setter 注解) 4、ILog 注解#package com.xiaofengstu.mcams.annotation; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; /** * @Author FengZeng * @Date 2022-05-21 00:48 * @Description TODO */ @Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) public @interface ILog { String value() default ""; }5、切面类 LogAspect#package com.xiaofengstu.mcams.aspect; import com.xiaofengstu.mcams.annotation.ILog; import com.xiaofengstu.mcams.util.ThreadLocalUtils; import com.xiaofengstu.mcams.web.entity.TLog; import com.xiaofengstu.mcams.web.service.TLogService; import lombok.RequiredArgsConstructor; 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.core.LocalVariableTableParameterNameDiscoverer; import org.springframework.stereotype.Component; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; import javax.servlet.http.HttpServletRequest; import java.lang.reflect.Method; import java.time.LocalDateTime; /** * @Author FengZeng * @Date 2022-05-21 00:42 * @Description TODO */ @Aspect @Component @RequiredArgsConstructor public class LogAspect { private final TLogService logService; @Pointcut("@annotation(com.xiaofengstu.mcams.annotation.ILog)") public void pointcut() { } @Around("pointcut()") public Object around(ProceedingJoinPoint point) { Object result = null; long beginTime = System.currentTimeMillis(); try { result = point.proceed(); } catch (Throwable e) { e.printStackTrace(); } long costTime = System.currentTimeMillis() - beginTime; saveLog(point, costTime); return result; } private void saveLog(ProceedingJoinPoint point, long costTime) { // 通过 point 拿到方法签名 MethodSignature methodSignature = (MethodSignature) point.getSignature(); // 通过方法签名拿到被调用的方法 Method method = methodSignature.getMethod(); TLog log = new TLog(); // 通过方法区获取方法上的 ILog 注解 ILog logAnnotation = method.getAnnotation(ILog.class); if (logAnnotation != null) { log.setOperation(logAnnotation.value()); } String className = point.getTarget().getClass().getName(); String methodName = methodSignature.getName(); log.setMethod(className + "." + methodName + "()"); // 获取方法的参数 Object[] args = point.getArgs(); LocalVariableTableParameterNameDiscoverer l = new LocalVariableTableParameterNameDiscoverer(); String[] parameterNames = l.getParameterNames(method); if (args != null && parameterNames != null) { StringBuilder param = new StringBuilder(); for (int i = 0; i < args.length; i++) { param.append(" ").append(parameterNames[i]).append(":").append(args[i]); } log.setParams(param.toString()); } ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes(); HttpServletRequest request = attributes.getRequest(); log.setIp(request.getRemoteAddr()); log.setUserId(ThreadLocalUtils.get()); log.setCostTime(costTime); log.setCreateTime(LocalDateTime.now()); logService.save(log); } } 因为我使用的是 Mybatis-plus,所以 logService.save(log); 是 mybatis-plus 原生的 save operation 这步其实就是把 log 插入到数据库 6、使用 只需要在方法上加上 @ILog 注解,并设置它的 value 即可(value 就是描述当前 method 作用) package com.xiaofengstu.mcams.web.controller; import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper; import com.xiaofengstu.mcams.annotation.ILog; import com.xiaofengstu.mcams.dto.BasicResultDTO; import com.xiaofengstu.mcams.enums.RespStatusEnum; import com.xiaofengstu.mcams.web.entity.TDept; import com.xiaofengstu.mcams.web.service.TDeptService; import lombok.RequiredArgsConstructor; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; import java.util.List; /** *
* 前端控制器 * * * @author fengzeng * @since 2022-05-07 */ @RestController @RequestMapping("/web/dept") @RequiredArgsConstructor public class TDeptController { private final TDeptService deptService; @ILog("获取部门列表") @GetMapping("/list") public BasicResultDTO
> getDeptListByCampId(@RequestParam("campusId") Integer campusId) { return new BasicResultDTO(RespStatusEnum.SUCCESS, deptService.list(new QueryWrapper
().eq("campus_id", campusId))); } @ILog("通过角色获取部门列表") @GetMapping("/listByRole") public BasicResultDTO > getDeptListByRole() { return new BasicResultDTO<>(RespStatusEnum.SUCCESS, deptService.listByRole()); } } 数据库: 总结 如果要对现有代码进行功能扩展,使用 AOP + 注解不妨为一种优雅的方式 对 AOP 不熟悉的小伙伴,可以深入了解一下,毕竟是 spring 最重要的特性之一。