AOP实现防重复提交
2022年12月24日约 1100 字大约 4 分钟
AOP实现防重复提交
1. 背景
由于网络加载是比较耗时的操作,如果前端没有控制防重复点击,那么请求就会添加到服务端中。这样就会导致数据库中出现重复数据。
我们可以通过自定义注解@RepeatSubmit,实现防重复提交
2. 实现步骤
2.1 自定义防止重复提交的注解
@Inherited
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RepeatSubmit
{
}
2.2 防止重复提交的拦截器
@Component
public abstract class RepeatSubmitInterceptor extends HandlerInterceptorAdapter
{
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception
{
if (handler instanceof HandlerMethod)
{
HandlerMethod handlerMethod = (HandlerMethod) handler;
Method method = handlerMethod.getMethod();
RepeatSubmit annotation = method.getAnnotation(RepeatSubmit.class);
if (annotation != null)
{
if (this.isRepeatSubmit(request))
{
AjaxResult ajaxResult = AjaxResult.error("不允许重复提交,请稍后再试");
ServletUtils.renderString(response, JSONObject.toJSONString(ajaxResult));
return false;
}
}
return true;
}
else
{
return super.preHandle(request, response, handler);
}
}
/**
* 验证是否重复提交由子类实现具体的防重复提交的规则
*
* @param request
* @return
* @throws Exception
*/
public abstract boolean isRepeatSubmit(HttpServletRequest request);
}
这里定义的是抽象类,需要自己实现isRepeatSubmit。他的实现类就要根据具体业务判断怎么判断是同一个用户。重复提交
2.3 实现类
2.3.1 方案一:基础方案实现类
根据请求的session判断
@Component
public class SameUrlDataInterceptor extends RepeatSubmitInterceptor
{
public final String REPEAT_PARAMS = "repeatParams";
public final String REPEAT_TIME = "repeatTime";
public final String SESSION_REPEAT_KEY = "repeatData";
/**
* 间隔时间,单位:秒 默认10秒
*
* 两次相同参数的请求,如果间隔时间大于该参数,系统不会认定为重复提交的数据
*/
private int intervalTime = 10;
public void setIntervalTime(int intervalTime)
{
this.intervalTime = intervalTime;
}
@SuppressWarnings("unchecked")
@Override
public boolean isRepeatSubmit(HttpServletRequest request) throws Exception
{
// 本次参数及系统时间
String nowParams = JSON.marshal(request.getParameterMap());
Map<String, Object> nowDataMap = new HashMap<String, Object>();
nowDataMap.put(REPEAT_PARAMS, nowParams);
nowDataMap.put(REPEAT_TIME, System.currentTimeMillis());
// 请求地址(作为存放session的key值)
String url = request.getRequestURI();
HttpSession session = request.getSession();
Object sessionObj = session.getAttribute(SESSION_REPEAT_KEY);
if (sessionObj != null)
{
Map<String, Object> sessionMap = (Map<String, Object>) sessionObj;
if (sessionMap.containsKey(url))
{
Map<String, Object> preDataMap = (Map<String, Object>) sessionMap.get(url);
if (compareParams(nowDataMap, preDataMap) && compareTime(nowDataMap, preDataMap))
{
return true;
}
}
}
Map<String, Object> sessionMap = new HashMap<String, Object>();
sessionMap.put(url, nowDataMap);
session.setAttribute(SESSION_REPEAT_KEY, sessionMap);
return false;
}
/**
* 判断参数是否相同
*/
private boolean compareParams(Map<String, Object> nowMap, Map<String, Object> preMap)
{
String nowParams = (String) nowMap.get(REPEAT_PARAMS);
String preParams = (String) preMap.get(REPEAT_PARAMS);
return nowParams.equals(preParams);
}
/**
* 判断两次间隔时间
*/
private boolean compareTime(Map<String, Object> nowMap, Map<String, Object> preMap)
{
long time1 = (Long) nowMap.get(REPEAT_TIME);
long time2 = (Long) preMap.get(REPEAT_TIME);
if ((time1 - time2) < (this.intervalTime * 1000))
{
return true;
}
return false;
}
}
2.3.2 方案二:根据oauth2的token校验
/**
* 判断请求url和数据是否和上一次相同,
* 如果和上次相同,则是重复提交表单。 有效时间为10秒内。
*
* @author ygn
*/
@Component
public class SameUrlDataInterceptor extends RepeatSubmitInterceptor
{
public final String REPEAT_PARAMS = "repeatParams";
public final String REPEAT_TIME = "repeatTime";
// 令牌自定义标识
@Value("${token.header}")
private String header;
@Autowired
private RedisCache redisCache;
/**
* 间隔时间,单位:秒 默认10秒
*
* 两次相同参数的请求,如果间隔时间大于该参数,系统不会认定为重复提交的数据
*/
private int intervalTime = 10;
public void setIntervalTime(int intervalTime)
{
this.intervalTime = intervalTime;
}
@SuppressWarnings("unchecked")
@Override
public boolean isRepeatSubmit(HttpServletRequest request)
{
String nowParams = "";
if (request instanceof RepeatedlyRequestWrapper)
{
RepeatedlyRequestWrapper repeatedlyRequest = (RepeatedlyRequestWrapper) request;
nowParams = HttpHelper.getBodyString(repeatedlyRequest);
}
// body参数为空,获取Parameter的数据
if (StringUtils.isEmpty(nowParams))
{
nowParams = JSONObject.toJSONString(request.getParameterMap());
}
Map<String, Object> nowDataMap = new HashMap<String, Object>();
nowDataMap.put(REPEAT_PARAMS, nowParams);
nowDataMap.put(REPEAT_TIME, System.currentTimeMillis());
// 请求地址(作为存放cache的key值)
String url = request.getRequestURI();
// 唯一值(没有消息头则使用请求地址)
String submitKey = request.getHeader(header);
if (StringUtils.isEmpty(submitKey))
{
submitKey = url;
}
// 唯一标识(指定key + 消息头)
String cacheRepeatKey = Constants.REPEAT_SUBMIT_KEY + submitKey;
Object sessionObj = redisCache.getCacheObject(cacheRepeatKey);
if (sessionObj != null)
{
Map<String, Object> sessionMap = (Map<String, Object>) sessionObj;
if (sessionMap.containsKey(url))
{
Map<String, Object> preDataMap = (Map<String, Object>) sessionMap.get(url);
if (compareParams(nowDataMap, preDataMap) && compareTime(nowDataMap, preDataMap))
{
return true;
}
}
}
Map<String, Object> cacheMap = new HashMap<String, Object>();
cacheMap.put(url, nowDataMap);
redisCache.setCacheObject(cacheRepeatKey, cacheMap, intervalTime, TimeUnit.SECONDS);
return false;
}
/**
* 判断参数是否相同
*/
private boolean compareParams(Map<String, Object> nowMap, Map<String, Object> preMap)
{
String nowParams = (String) nowMap.get(REPEAT_PARAMS);
String preParams = (String) preMap.get(REPEAT_PARAMS);
return nowParams.equals(preParams);
}
/**
* 判断两次间隔时间
*/
private boolean compareTime(Map<String, Object> nowMap, Map<String, Object> preMap)
{
long time1 = (Long) nowMap.get(REPEAT_TIME);
long time2 = (Long) preMap.get(REPEAT_TIME);
if ((time1 - time2) < (this.intervalTime * 1000))
{
return true;
}
return false;
}
}
2.4 配置拦截重复提交的请求
/**
* 配置拦截重复提交的请求
* @param registry
*/
@Override
public void addInterceptors(InterceptorRegistry registry){
registry.addInterceptor(repeatSubmitInterceptor).addPathPatterns("/**");
}
3. 使用方法
在接口方法上添加@RepeatSubmit
注解即可,注解参数说明:
参数 | 类型 | 默认值 | 描述 |
---|---|---|---|
interval | int | 5000 | 间隔时间(ms),小于此时间视为重复提交 |
message | String | 不允许重复提交,请稍后再试 | 提示消息 |
示例1:采用默认参数
@RepeatSubmit
public AjaxResult addSave(...)
{
return success(...);
}
示例2:指定防重复时间和错误消息
@RepeatSubmit(interval = 1000, message = "请求过于频繁")
public AjaxResult addSave(...)
{
return success(...);
}
参考文章
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