html+springMVC的拦截器token配置--解决ajax表单重复提交的问题

//定义注解类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;} 

//拦截器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 {    System.out.println(handler instanceof HandlerMethod);        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();                System.out.println(needRemoveSession+"    ");                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");        System.out.println("serverToken:"+serverToken);        if (serverToken == null) {            return true;        }        String clinetToken = request.getParameter("token");        System.out.println("clinetToken"+clinetToken);        if (clinetToken == null) {            return true;        }        if (!serverToken.equals(clinetToken)) {            return true;        }        return false;    }}
<!-- 拦截器的配置
-->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" /><bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter" ><property name="messageConverters"><list><ref bean="mappingJacksonHttpMessageConverter" /> JSON转换器</list></property></bean>


 //后台传输token到html前端@RequestMapping("/token.do")    @Token(save=true)    public void saveData(HttpServletRequest request,HttpServletResponse response){       System.out.println("此方法为开始创建token，，如有数据提交前的方法直接加入注释@Token(save=true)就行");}//获取token返回到前台 @RequestMapping("/getToken.do")    @ResponseBody    @Token(save=true)    public Map<String,Object> getTkoen(HttpServletRequest request,HttpServletResponse response){     String serverToken = (String) request.getSession(true).getAttribute("token");     Map<String,Object> map=new HashMap<String, Object>();     map.put("serverToken", serverToken);     return map;}/* *在数据提交接口加入@Token(remove=true)注释，ajax提交的时候把获取到的token返回，表单提交加入<input type="hidden" name="token" value="${token}" /> */