新增@RepeatSubmit注解，防止重复提交

ruoyi/src/main/java/com/ruoyi/framework/config/ResourcesConfig.java

 package com.ruoyi.framework.config;
 
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
 import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 import com.ruoyi.common.constant.Constants;
+import com.ruoyi.framework.interceptor.RepeatSubmitInterceptor;
 
 /**
  * 通用配置
@@ -13,6 +16,9 @@ import com.ruoyi.common.constant.Constants;
 @Configuration
 public class ResourcesConfig implements WebMvcConfigurer
 {
+    @Autowired
+    private RepeatSubmitInterceptor repeatSubmitInterceptor;
+
     @Override
     public void addResourceHandlers(ResourceHandlerRegistry registry)
     {
@@ -23,4 +29,13 @@ public class ResourcesConfig implements WebMvcConfigurer
         registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/");
         registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
     }
+
+    /**
+     * 自定义拦截规则
+     */
+    @Override
+    public void addInterceptors(InterceptorRegistry registry)
+    {
+        registry.addInterceptor(repeatSubmitInterceptor).addPathPatterns("/**");
+    }
 }
\ No newline at end of file

ruoyi/src/main/java/com/ruoyi/framework/interceptor/RepeatSubmitInterceptor.java

+package com.ruoyi.framework.interceptor;
+
+import java.lang.reflect.Method;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.springframework.stereotype.Component;
+import org.springframework.web.method.HandlerMethod;
+import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
+import com.alibaba.fastjson.JSONObject;
+import com.ruoyi.common.utils.ServletUtils;
+import com.ruoyi.framework.interceptor.annotation.RepeatSubmit;
+import com.ruoyi.framework.web.domain.AjaxResult;
+
+/**
+ * 防止重复提交拦截器
+ * 
+ * @author ruoyi
+ */
+@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 httpServletRequest
+     * @return
+     * @throws Exception
+     */
+    public abstract boolean isRepeatSubmit(HttpServletRequest request);
+}

ruoyi/src/main/java/com/ruoyi/framework/interceptor/annotation/RepeatSubmit.java

+package com.ruoyi.framework.interceptor.annotation;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Inherited;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * 自定义注解防止表单重复提交
+ * 
+ * @author ruoyi
+ *
+ */
+@Inherited
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+public @interface RepeatSubmit
+{
+
+}
\ No newline at end of file

ruoyi/src/main/java/com/ruoyi/framework/interceptor/impl/SameUrlDataInterceptor.java

+package com.ruoyi.framework.interceptor.impl;
+
+import java.util.HashMap;
+import java.util.Map;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpSession;
+import org.springframework.stereotype.Component;
+import com.alibaba.fastjson.JSONObject;
+import com.ruoyi.framework.interceptor.RepeatSubmitInterceptor;
+
+/**
+ * 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 ruoyi
+ */
+@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)
+    {
+        // 本次参数及系统时间
+        String 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;
+    }
+}