Servlet中防止盗链的代码

package priv.lwx.javaex.servlet_demo.web.servlet.request;

/**
 * 获取referer，防止盗链
 *
 * @author liaowenxiong
 * @date 2021/12/29 11:21
 */


import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(value = "/request_demo04")
public class RequestDemo04 extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // 获取referer
    String referer = request.getHeader("referer");
    System.out.println(referer);
    // 防止盗链
    if (referer != null) {
      if (referer.contains("/web-demo-03")) {
        // 应用内正常访问
        System.out.println("播放电影");
      } else {
        // 应用外访问
        System.out.println("想看电影吗？来优酷吧！");
      }
    }

  }

  @Override
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  }
}