spring 注解重复(防重复请求)

1、配置拦截器

spring-mvc.xml

<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**/*"/>
<mvc:exclude-mapping path="/css/**"/>
<mvc:exclude-mapping path="/images/**"/>
<mvc:exclude-mapping path="/js/**"/>
<mvc:exclude-mapping path="/upload/**"/>
<bean class="com.tp.soft.common.interceptor.AvoidDuplicateSubmissionInterceptor" />
</mvc:interceptor>
</mvc:interceptors>

2、写注解接口

Token.java

package com.tp.soft.common.interceptor;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention (RetentionPolicy.RUNTIME)
public @interface Token {
     boolean save() default false ;
     boolean remove() default false ;
}

3、写拦截器

AvoidDuplicateSubmissionInterceptor.java

package com.tp.soft.common.interceptor;

import java.lang.reflect.Method;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class AvoidDuplicateSubmissionInterceptor 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();
             Token annotation = method.getAnnotation(Token.class);
             if (annotation != null ) {
                 boolean needSaveSession = annotation.save();
                 if (needSaveSession) {
                     request.getSession( false ).setAttribute("token", UUID.randomUUID().toString());
                 }
                 boolean needRemoveSession = annotation.remove();
                 if (needRemoveSession) {
                     if (isRepeatSubmit(request)) {
                         return false ;
                     }
                     request.getSession( false ).removeAttribute( "token" );
                 }
             }
             return true ;
         } else {
             return super .preHandle(request, response, handler);
         }
    }
    
    private boolean isRepeatSubmit(HttpServletRequest request) {
        String serverToken = (String) request.getSession( false ).getAttribute( "token" );
        if (serverToken == null ) {
            return true ;
        }
        String clinetToken = request.getParameter( "token" );
        if (clinetToken == null ) {
            return true ;
        }
        if (!serverToken.equals(clinetToken)) {
            return true ;
        }
        return false ;
    }

}

4、在需要生成token的方法上写上@Token(save=true) 在重复请求的方法上写上@Token(remove=true)

5、在页面上如果是form表单写上

<input type="hidden" name="token" value="${token}" />

如果是异步的则直接用${token}传入参数