springMVC 防止表单重复提交
原理:在新建页面中Session保存token随机码,当保存时验证,通过后删除,当再次点击保存时由于服务器端的Session中已经不存在了,所有无法验证通过。
新建注解:Token.java
packagegov.saxmz.one.controller;
importjava.lang.annotation.ElementType;
importjava.lang.annotation.Retention;
importjava.lang.annotation.RetentionPolicy;
importjava.lang.annotation.Target;
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public@interfaceToken{
booleansave()defaultfalse;
booleanremove()defaultfalse;
}
新建拦截器:TokenInterceptor.java
packagegov.saxmz.one.controller;
importjava.lang.reflect.Method;
importjava.util.UUID;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importorg.springframework.web.method.HandlerMethod;
importorg.springframework.web.servlet.handler.HandlerInterceptorAdapter;
publicclassTokenInterceptorextendsHandlerInterceptorAdapter{
@Override
publicbooleanpreHandle(HttpServletRequestrequest,HttpServletResponseresponse,Objecthandler)throwsException{
if(handlerinstanceofHandlerMethod){
HandlerMethodhandlerMethod=(HandlerMethod)handler;
Methodmethod=handlerMethod.getMethod();
Tokenannotation=method.getAnnotation(Token.class);
if(annotation!=null){
booleanneedSaveSession=annotation.save();
if(needSaveSession){
request.getSession(false).setAttribute("token",UUID.randomUUID().toString());
}
booleanneedRemoveSession=annotation.remove();
if(needRemoveSession){
if(isRepeatSubmit(request)){
returnfalse;
}
request.getSession(false).removeAttribute("token");
}
}
returntrue;
}else{
returnsuper.preHandle(request,response,handler);
}
}
privatebooleanisRepeatSubmit(HttpServletRequestrequest){
StringserverToken=(String)request.getSession(false).getAttribute("token");
if(serverToken==null){
returntrue;
}
StringclinetToken=request.getParameter("token");
if(clinetToken==null){
returntrue;
}
if(!serverToken.equals(clinetToken)){
returntrue;
}
returnfalse;
}
}
在Spring-MVC.xml中配置:
<!--拦截器配置-->
<mvc:interceptors>
<mvc:interceptor>
<mvc:mappingpath="/**"/>
<beanclass="gov.saxmz.one.controller.TokenInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
在相关方法中加入注解:
在需要生成token的controller上增加@Token(save=true),而在需要检查重复提交的controller上添加@Token(remove=true)就可以了。
在jsp页面中加入:
<inputtype="hidden"name="token"value="${token}">