好的，來點實際代碼，也許實際代碼才是最好的老師：
註解Token代碼：
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Token {
boolean save() default false;
boolean remove() default false;
}
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Token {
boolean save() default false;
boolean remove() default false;
}
攔截器TokenInterceptor代碼：
public class TokenInterceptor 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;
}
}
public class TokenInterceptor 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;
}
}
然後在Spring MVC的配置文件裏加入：
<!-- 攔截器配置 -->
<mvc:interceptors>
<!-- 配置Shiro攔截器，實現註冊用戶的註入 -->
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.storezhang.video.shiro.ShiroInterceptor"/>
</mvc:interceptor>
<!-- 配置Token攔截器，防止用戶重復提交數據 -->
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.storezhang.web.spring.TokenInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
<!-- 攔截器配置 -->
<mvc:interceptors>
<!-- 配置Shiro攔截器，實現註冊用戶的註入 -->
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.storezhang.video.shiro.ShiroInterceptor"/>
</mvc:interceptor>
<!-- 配置Token攔截器，防止用戶重復提交數據 -->
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.storezhang.web.spring.TokenInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
相關代碼已經註釋，相信妳能看懂。
關於這個方法的用法是：在需要生成token的controller上增加@Token(save=true)，而在需要檢查重復提交的controller上添加@Token(remove=true)就可以了。
另外，妳需要在view裏在form裏增加下面代碼：
<input type="hidden" name="token" value="${token}" />
<input type="hidden" name="token" value="${token}" />
已經完成了，去試試看妳的數據還能重復提交了吧。