解決攔截器對ajax請求的攔截執行個體詳解_jquery

來源:互聯網
上載者:User

解決攔截器對ajax請求的的攔截

攔截器配置:

public boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object obj) throws Exception {        //擷取判定登陸的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、判斷 String XRequested =request.getHeader("X-Requested-With") 的值,目的是判斷是否是ajax請求。

2、response.getWriter().write("IsAjax");寫出一個響應的資料給ajax,這樣就可以在ajax裡面做判斷

  判斷的方式存在兩種方式:

  1)直接在ajax裡面做判斷(不建議)

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

  2)改ajax源碼然後在做壓縮,是針對全域的方式來修改的(建議)

 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;          //解決ajax攔截問題          var result = responses.text;          if(result.indexOf("IsAjax")>=0){            window.location.href="m-web/user/toLogin";            return;          }        }      }

 感謝閱讀,希望能協助到大家,謝謝大家對本站的支援!

相關文章

聯繫我們

該頁面正文內容均來源於網絡整理,並不代表阿里雲官方的觀點,該頁面所提到的產品和服務也與阿里云無關,如果該頁面內容對您造成了困擾,歡迎寫郵件給我們,收到郵件我們將在5個工作日內處理。

如果您發現本社區中有涉嫌抄襲的內容,歡迎發送郵件至: info-contact@alibabacloud.com 進行舉報並提供相關證據,工作人員會在 5 個工作天內聯絡您,一經查實,本站將立刻刪除涉嫌侵權內容。

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.