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：
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/**
* <p>
* 防止重复提交注解，用于方法上<br/>
* 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，
* 同时需要在新建的页面中添加
* <input type="hidden" name="token" value="${token}">
* <br/>
* 保存方法需要验证重复提交的，设置needRemoveToken为true
* 此时会在拦截器中验证是否重复提交
* </p>
* @author: chuanli
* @date: 2013-6-27上午11:14:02
*
*/
@Target
(ElementType.METHOD)
@Retention
(RetentionPolicy.RUNTIME)
public
@interface
AvoidDuplicateSubmission {
boolean
needSaveToken()
default
false
;
boolean
needRemoveToken()
default
false
;
}
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2. 新建拦截器
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/**
* <p>
* 防止重复提交过滤器
* </p>
*
* @author: chuanli
* @date: 2013-6-27上午11:19:05
*/
public
class
AvoidDuplicateSubmissionInterceptor
extends
HandlerInterceptorAdapter {
private
static
final
Logger LOG = Logger.getLogger(AvoidDuplicateSubmissionInterceptor.
class
);
@Override
public
boolean
preHandle(HttpServletRequest request,
HttpServletResponse response, Object handler)
throws
Exception {
User user = UserUtil.getUser();
if
(user !=
null
) {
HandlerMethod handlerMethod = (HandlerMethod) handler;
Method method = handlerMethod.getMethod();
AvoidDuplicateSubmission annotation = method.getAnnotation(AvoidDuplicateSubmission.
class
);
if
(annotation !=
null
) {
boolean
needSaveSession = annotation.needSaveToken();
if
(needSaveSession) {
request.getSession(
false
).setAttribute(
"token"
, TokenProcessor.getInstance().generateToken());
}
boolean
needRemoveSession = annotation.needRemoveToken();
if
(needRemoveSession) {
if
(isRepeatSubmit(request)) {
LOG.warn(
"please don't repeat submit,[user:"
+ user.getUsername() +
",url:"
+ request.getServletPath() +
"]"
);
return
false
;
}
request.getSession(
false
).removeAttribute(
"token"
);
}
}
}
return
true
;
}
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
;
}
}
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3. 在Spring中配置
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<
bean
class
=
"org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"
>
<
property
name
=
"interceptors"
>
<
list
>
<
bean
class
=
"com.sohu.tv.crm.aop.UserLogInterceptor"
/>
<
bean
class
=
"com.sohu.tv.crm.aop.AvoidDuplicateSubmissionInterceptor"
/>
</
list
>
</
property
>
</
bean
>
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4. 在相关方法中加入注解：
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@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 {
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5.在新建页面中加入
<input type="hidden" name="token" value="${token}">