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    3. web页面防盗链功能使用--request.getHeader("referer")

    web页面防盗链功能使用--request.getHeader("referer")

    xiaoxiao2021-12-14  22
    import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet implementation class RefererServlet */ @WebServlet("/RefererServlet") public class RefererServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public RefererServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub response.getWriter().append("Served at: ").append(request.getContextPath()); //referer为客户端带来的请求头 String referer = request.getHeader("referer"); System.out.println(referer); //如果链接出自地址栏的输入，则跳转至本站点RequestAndResponse应用的首页 if (referer==null) { System.out.println("由于您访问的内容版权所有，您是地址栏上输入的链接，即将跳转至本站首页..."); response.sendRedirect("/Servlet_test1/index.html"); return ; } //如果链接出自本站点的RequestAndResponse应用的页面，则正常显示，如果是出自其他站点或本站点的其他应用，则跳转至本站点RequestAndResponse应用的首页 if(!referer.startsWith("http://localhost:8080/Servlet_test1")){ System.out.println("由于您访问的内容版权所有，您是其他网站页面的链接，即将跳转至本站首页..."); response.sendRedirect("/Servlet_test1/index.html"); return ; }else { System.out.println("来自本站页面的链接,合法用户"); request.getRequestDispatcher("content.jsp").forward(request, response); } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
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