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
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Token {
boolean create() default false;
boolean remove() default false;
}
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
public class TokenInterceptor extends HandlerInterceptorAdapter {
private Logger logger = Logger.getLogger(TokenInterceptor.class);
private static final String TOKEN = "token";
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
Object handler) throws Exception {
if (handler instanceof HandlerMethod) {
Method method = ((HandlerMethod) handler).getMethod();
Token annotation = method.getAnnotation(Token.class);
if (annotation != null) {
HttpSession session = request.getSession();
// 创建token
boolean create = annotation.create();
if (create) {
session.setAttribute(TOKEN, UUID.randomUUID().toString());
return true;
}
// 删除token
boolean remove = annotation.remove();
if (remove) {
if (isRepeatSubmit(request)) {
logger.warn("表单不能重复提交:" + request.getRequestURL());
return false;
}
session.removeAttribute(TOKEN);
}
}
} else {
return super.preHandle(request, response, handler);
}
return true;
}
private boolean isRepeatSubmit(HttpServletRequest request) {
String token = (String) request.getSession().getAttribute(TOKEN);
if (token == null) {
return true;
}
String reqToken = request.getParameter(TOKEN);
if (reqToken == null) {
return true;
}
if (!token.equals(reqToken)) {
return true;
}
return false;
}
}
配置拦截器
<!--配置拦截器 -->
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**" />
<bean class="com.example.web.interceptor.TokenInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
表单添加token
<input type="hidden" id="token" name="token" value="$!{session.getAttribute('token')}"/>
在form表单里面添加token域，提交表单时需要传过去。
