防盜鏈

原理：判斷http消息頭中的referer是否爲空或者是否不爲localhost

 

代碼放在：jsp文件引入，由於全部數據都是以jsp頁面的形式展現出來的

<%@page import="com.qipai.referer_module.Request_referer" %> //引入包

<%

Request_referer Rr=new Request_referer();

Rr.Referer(request, response);

%>

 

 

代碼：

 //這個函數屬於Request_referer 類 

  public  void Referer(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{

                   //設置瀏覽器以什麼編碼打開

                   response.setCharacterEncoding("utf-8");

                   response.setContentType("text/html;utf-8");

                   PrintWriter out=response.getWriter();

                   //獲取請求頭

                   String referer=request.getHeader("Referer");

                   //判斷這個請求頭是否爲空，或者這個請求頭是否不爲localhost

                   if(referer == null || !referer.startsWith("http://localhost")){

                            out.println("請登陸");

                            response.sendRedirect("http://localhost:8080/QiPaiProject/Login.jsp");

 

}

         }