spring mvc防止表单重复提交的代码片段

1.定义一个token接口

package com.bigbigrain.token;

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

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

    boolean remove() default false;
}

2.实现拦截器

package com.bigbigrain.token;

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

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

import org.apache.log4j.Logger;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class TokenInterceptor extends HandlerInterceptorAdapter {
    private static final Logger LOG = Logger.getLogger(Token.class);
    @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(true).setAttribute("token", UUID.randomUUID().toString());
                }
                boolean needRemoveSession = annotation.remove();
                if (needRemoveSession) {
                    if (isRepeatSubmit(request)) {
                         LOG.warn("please don't repeat submit,url:"+ request.getServletPath());
                        return false;
                    }
                    request.getSession(true).removeAttribute("token");
                }
            }
            return true;
        } else {
            return super.preHandle(request, response, handler);
        }
    }

    private boolean isRepeatSubmit(HttpServletRequest request) {
        String serverToken = (String) request.getSession(true).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;
    }
}

3.配置文件配置

~<!-- 拦截器配置 -->
<mvc:interceptors>
        <!-- 配置Token拦截器，防止用户重复提交数据 -->
        <mvc:interceptor>
            <mvc:mapping path="/**"/><!--这个地方时你要拦截得路径 我这个意思是拦截所有得URL-->
            <bean class="com.dinfo.interceptor.TokenInterceptor"/><!--class文件路径改成你自己写得拦截器路径！！ -->
        </mvc:interceptor>
</mvc:interceptors>

4.在跳转需要生成token页面的controller的方法加上注解~@Token(save=true)；页面加上~<input type="hidden" name="token" value="${token}" />；在页面提交处理方法上加上~@Token(remove=true)注解

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