场景

需要使用AOP记录下后台删除更新操作，并存到数据库中作为备份，在记录更新操作的时候需要详细记录下哪个字段发生变化

思路

1、使用Spring AOP思想，并将切面设置为自定义注解，更具有灵活性。
2、在记录更新操作时，需要获取更新前参数，考虑到因为通用性，可以在自定义注解里面添加参数，记录通过ID查询的方法名、ID位于第几个参数中、更新ID的名字是什么，将参数转为JSONString后ID如果有多个，位于第几个
3、比较参数发生变化的时候就调用之前博客写的比较方法，即可得到

代码

切面类

@Slf4j
@Aspect
@Configuration
public class LogAspect {@AutowiredMongoTemplate mongoTemplate;@Autowiredprivate ApplicationContext applicationContext;private static final Pattern PATTERN = Pattern.compile("\\W");/*** 确定切入点*/@Pointcut("@annotation(com.neu.hopdm.annotation.LogAnnotation)")public void aspectLog() {}@Around("aspectLog()")public Object doAfterReturning(ProceedingJoinPoint joinPoint) throws Throwable {//获取用户ID //（省略）//获取注解MethodSignature signature = (MethodSignature) joinPoint.getSignature();Method method = signature.getMethod();LogAnnotation logAnnotation = method.getAnnotation(LogAnnotation.class);ApiOperation apiOperation = method.getAnnotation(ApiOperation.class);Object afterUpdateObject = getMethodArgs(joinPoint).get(logAnnotation.argsNum());String afterUpdateString = JSON.toJSONString(afterUpdateObject);MongoLog mongoLog = new MongoLog();if (logAnnotation.type().equalsIgnoreCase("update") && StringUtils.isNoneEmpty(logAnnotation.methodName())) {//如果类型为update且根据ID查询方法名不为空，则进行更新前后参数比较compareDifferent(joinPoint, logAnnotation, afterUpdateObject, mongoLog);}mongoLog.setAfterUpdate(afterUpdateString);log.info("更新之后参数(请求参数)：{}", afterUpdateString);//获取IP地址String address = getLocalHost().getHostAddress();//获取时间String date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());String message = null;try {Object proceed = joinPoint.proceed();if (((Result) proceed).getData() == Boolean.TRUE) {message = "success";} else {message = "error：更新失败， \"Data\": false；";}return proceed;} catch (Throwable throwable) {message = "error：" + throwable.getMessage();throw throwable;} finally {mongoLog.setUserId("testId");mongoLog.setIpAddress(address);mongoLog.setTime(date);mongoLog.setType(logAnnotation.type());mongoLog.setMethod(method.getName());mongoLog.setDescribe(apiOperation.value());mongoLog.setResult(message);mongoTemplate.insert(mongoLog);log.info("LogAnnotation： 用户ID:{}， IP:{}， 时间:{}， 操作类型:{}， 操作方法:{}， 方法描述：{}， 执行结果:{}", "testID", address, date, logAnnotation.type(), method.getName(), apiOperation.value(), message);}}private void compareDifferent(ProceedingJoinPoint joinPoint, LogAnnotation logAnnotation, Object afterUpdateObject, MongoLog mongoLog) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {String afterUpdateString = JSON.toJSONString(afterUpdateObject);Class<?> aClass = joinPoint.getTarget().getClass();Method method1 = aClass.getMethod(logAnnotation.methodName(), String.class);Object o = applicationContext.getBean(aClass);//获取更新IDString[] split = afterUpdateString.split("\"");int num = 0;String updateId = null;for (int i = 0; i < split.length; i++) {if (split[i].equals(logAnnotation.idName())) {num++;}if (num == logAnnotation.idNum()) {if (split[i + 1].equals(":")) {updateId = split[i + 2];} else {updateId = split[i + 1];}break;}}if (updateId != null && StringUtils.isNoneEmpty(updateId)) {Matcher m = PATTERN.matcher(updateId);updateId = m.replaceAll("").trim();log.info("updateId = {}", updateId);Object beforeUpdateObject = ((Result) method1.invoke(o, updateId)).getData();mongoLog.setBeforeUpdate(JSON.toJSONString(beforeUpdateObject));log.info("更新之前参数：{}", JSON.toJSONString(beforeUpdateObject));String diff = ReflectUtils.compareDiff(afterUpdateObject, beforeUpdateObject);mongoLog.setDiffUpdate(diff);log.info("更新参数 = " + diff);}}/*** 获取方法参数*/public static List<Object> getMethodArgs(JoinPoint joinPoint) {Object[] args = joinPoint.getArgs();if (args == null || args.length == 0) {return new ArrayList<>(0);}return Arrays.stream(args).filter(arg ->!(arg instanceof Model)&& !(arg instanceof ModelMap)&& !(arg instanceof BeanPropertyBindingResult)&& !(arg instanceof MultipartFile)).collect(Collectors.toList());}
}

切面注解

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface LogAnnotation {/*** 操作类型 -- delete、update*/String type() default "";/*** 通过ID查询方法名（只在更新方法上填写）*/String methodName() default "";/*** 默认从第一个参数上获取更新ID（下标从0开始,只在更新方法上填写）*/int argsNum() default 0;/*** 更新ID名称（默认是叫id,只在更新方法上填写)*/String idName() default "id";/*** 更新ID在参数中的位置（默认转换为JSONString后，取第一个,只在更新方法上填写)*/int idNum() default 1;
}