Spring MVC拦截器+注解方式实现防止表单重复提交

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。

1.新建注解

1/**
2 * <p>
3 * 防止重复提交注解，用于方法上<br/>
4 * 在新建页面方法上，设置needSaveToken()为true，此时拦截器会在Session中保存一个token，
5 * 同时需要在新建的页面中添加
6 * <input type="hidden" name="token" value="${token}">
7 * <br/>
8 * 保存方法需要验证重复提交的，设置needRemoveToken为true
9 * 此时会在拦截器中验证是否重复提交
10 * </p>
11 * @author: chuanli
12 * @date: 2013-6-27上午11:14:02
13 *
14 */
15@Target(ElementType.METHOD)
16@Retention(RetentionPolicy.RUNTIME)
17public @interface AvoidDuplicateSubmission {
18    boolean needSaveToken() default false;
19    boolean needRemoveToken() default false;
20}

2. 新建拦截器

1/**
2 * <p>
3 * 防止重复提交过滤器
4 * </p>
5 *
6 * @author: chuanli
7 * @date: 2013-6-27上午11:19:05
8 */
9public class AvoidDuplicateSubmissionInterceptor extends HandlerInterceptorAdapter {
10    private static final Logger LOG = Logger.getLogger(AvoidDuplicateSubmissionInterceptor.class);
11
12    @Override
13    public boolean preHandle(HttpServletRequest request,
14            HttpServletResponse response, Object handler) throws Exception {
15
16        User user = UserUtil.getUser();
17        if (user != null) {
18            HandlerMethod handlerMethod = (HandlerMethod) handler;
19            Method method = handlerMethod.getMethod();
20
21            AvoidDuplicateSubmission annotation = method.getAnnotation(AvoidDuplicateSubmission.class);
22            if (annotation != null) {
23                boolean needSaveSession = annotation.needSaveToken();
24                if (needSaveSession) {
25                    request.getSession(false).setAttribute("token", TokenProcessor.getInstance().generateToken());
26                }
27
28                boolean needRemoveSession = annotation.needRemoveToken();
29                if (needRemoveSession) {
30                    if (isRepeatSubmit(request)) {
31                        LOG.warn("please don't repeat submit,[user:" + user.getUsername() + ",url:"
32                                + request.getServletPath() + "]");
33                        return false;
34                    }
35                    request.getSession(false).removeAttribute("token");
36                }
37            }
38        }
39        return true;
40    }
41
42    private boolean isRepeatSubmit(HttpServletRequest request) {
43        String serverToken = (String) request.getSession(false).getAttribute("token");
44        if (serverToken == null) {
45            return true;
46        }
47        String clinetToken = request.getParameter("token");
48        if (clinetToken == null) {
49            return true;
50        }
51        if (!serverToken.equals(clinetToken)) {
52            return true;
53        }
54        return false;
55    }
56
57}

3. 在Spring中配置

1<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping">
2   <property name="interceptors">
3      <list>
4          <bean class="com.sohu.tv.crm.aop.UserLogInterceptor"/>
5          <bean class="com.sohu.tv.crm.aop.AvoidDuplicateSubmissionInterceptor"/>
6      </list>
7   </property>
8
9</bean>

4. 在相关方法中加入注解：

@RequestMapping("/save") @AvoidDuplicateSubmission(needRemoveToken = true) public synchronized ModelAndView save(ExecutionUnit unit, HttpServletRequest request, HttpServletResponse response) throws Exception {

@RequestMapping("/edit") @AvoidDuplicateSubmission(needSaveToken = true) public ModelAndView edit(Integer id, HttpServletRequest request) throws Exception {

5.在新建页面中加入