防止数据重复提交

2015-12-10

http://blog.icoolxue.com/submitted-by-spring-mvc-to-prevent-data-duplication/

我的代码示例：
@Retention(RetentionPolicy.RUNTIME)
public @interface Token {

boolean save() default false;
boolean remove() default false;<br />}<br />public class TokenInterceptor extends HandlerInterceptorAdapter {
private static Logger logger = LoggerFactory.getLogger(TokenInterceptor.class);
@Override<br />    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {<br />        if (handler instanceof HandlerMethod) {<br />            HandlerMethod handlerMethod = (HandlerMethod) handler;<br />            Method method = handlerMethod.getMethod();<br />            Token annotation = method.getAnnotation(Token.class);<br />            if (annotation != null) {<br />                boolean needSaveSession = annotation.save();<br />                if (needSaveSession) {<br />                    request.getSession(false).setAttribute("token", UUID.randomUUID().toString());<br />                }<br />                boolean needRemoveSession = annotation.remove();<br />                if (needRemoveSession) {<br />                    if (isRepeatSubmit(request)) {<br />                        logger.debug("拦截到重复提交");<br />                        return false;<br />                    }<br />                    request.getSession(false).removeAttribute("token");<br />                }<br />            }<br />            return true;<br />        } else {<br />            return super.preHandle(request, response, handler);<br />        }<br />    }
private boolean isRepeatSubmit(HttpServletRequest request) {<br />        String serverToken = (String) request.getSession(false).getAttribute("token");<br />        if (serverToken == null) {<br />            return true;<br />        }<br />        String clinetToken = request.getParameter("token");<br />        if (clinetToken == null) {<br />            return true;<br />        }<br />        if (!serverToken.equals(clinetToken)) {<br />            return true;<br />        }<br />        return false;<br />    }<br />}

@Token(save=true,remove = false) 跳转页面使用

@Token(save=false,remove = true) 提交按钮使用