解决拦截器对ajax请求的的拦截

拦截器配置:

public boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object obj) throws Exception {
        
        //获取判定登陆的session是否存在
        String token = (String) request.getSession().getAttribute("token");
        String postId = (String) request.getSession().getAttribute("postId");
        if(token == null || token == ""){
            String XRequested =request.getHeader("X-Requested-With");
            if("XMLHttpRequest".equals(XRequested)){
                response.getWriter().write("IsAjax");
            }else{
                response.sendRedirect("/m-web/user/toLogin");
            }
            return false;
        }
        if(postId == null || postId == ""){
            String XRequested =request.getHeader("X-Requested-With");
            if("XMLHttpRequest".equals(XRequested)){
                response.getWriter().write("IsAjax");
            }else{
                response.sendRedirect("/m-web/user/toLogin");
            }
            return false;
        }
        return true;
    }

1、判断 String XRequested =request.getHeader("X-Requested-With") 的值,目的是判断是否是ajax请求。

2、response.getWriter().write("IsAjax");写出一个响应的数据给ajax,这样就可以在ajax里面做判断

  判断的方式存在两种方式:

  1)直接在ajax里面做判断(不建议)

success:function(data){
    if(data == "IsAjax"){
        window.location.href="m-web/user/toLogin"
        return;
    }
}

  2)改jQuery源码然后在做压缩,是针对全局的方式来修改的(建议)

      if ( isSuccess ) {// if no content
                if ( status === 204 || s.type === "HEAD" ) {
                    statusText = "nocontent";

                // if not modified
                } else if ( status === 304 ) {
                    statusText = "notmodified";

                // If we have data, let's convert it
                } else {
                    statusText = response.state;
                    success = response.data;
                    error = response.error;
                    isSuccess = !error;
                    //解决ajax拦截问题
                    var result = responses.text;
                    if(result.indexOf("IsAjax")>=0){
                        window.location.href="m-web/user/toLogin";
                        return;
                    }
                }
            }
posted @ 2016-12-20 17:14  小不点丶  阅读(16404)  评论(1编辑  收藏