Spring MVC表单防重复提交
利用Spring MVC的过滤器及token传递验证来实现表单防重复提交。
创建注解
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@Target(ElementType.METHOD)
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@Retention(RetentionPolicy.RUNTIME)
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@Documented
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public @interface Token {
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boolean create() default false;
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boolean remove() default false;
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}
在跳转页面的方法上加上:@Token(create = true)\ 在提交的action方法上加上:@Token(remove = true)
创建过滤器
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public class TokenInterceptor extends HandlerInterceptorAdapter {
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private Logger logger = Logger.getLogger(TokenInterceptor.class);
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private static final String TOKEN = "token";
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@Override
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public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
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Object handler) throws Exception {
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if (handler instanceof HandlerMethod) {
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Method method = ((HandlerMethod) handler).getMethod();
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Token annotation = method.getAnnotation(Token.class);
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if (annotation != null) {
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HttpSession session = request.getSession();
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// 创建token
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boolean create = annotation.create();
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if (create) {
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session.setAttribute(TOKEN, UUID.randomUUID().toString());
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return true;
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}
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// 删除token
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boolean remove = annotation.remove();
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if (remove) {
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if (isRepeatSubmit(request)) {
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logger.warn("表单不能重复提交:" + request.getRequestURL());
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return false;
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}
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session.removeAttribute(TOKEN);
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}
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}
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} else {
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return super.preHandle(request, response, handler);
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}
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return true;
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}
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private boolean isRepeatSubmit(HttpServletRequest request) {
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String token = (String) request.getSession().getAttribute(TOKEN);
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if (token == null) {
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return true;
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}
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String reqToken = request.getParameter(TOKEN);
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if (reqToken == null) {
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return true;
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}
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if (!token.equals(reqToken)) {
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return true;
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}
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return false;
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}
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}
配置拦截器
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<!--配置拦截器 -->
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<mvc:interceptors>
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<mvc:interceptor>
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<mvc:mapping path="/**" />
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<bean class="com.example.web.interceptor.TokenInterceptor"/>
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</mvc:interceptor>
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</mvc:interceptors>
表单添加token
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<input type="hidden" id="token" name="token" value="$!{session.getAttribute('token')}"/>