Servlet中判断浏览器版本的代码

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

/**
 * 获取user-agent，判断浏览器版本
 *
 * @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;
import java.util.Enumeration;

@WebServlet(value = "/request_demo03")
public class RequestDemo03 extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // 获取user-agent
    String agent = request.getHeader("user-agent");
    // 判断浏览器的版本
    if (agent.contains("Chrome")) {
      // 谷歌
      System.out.println("谷歌浏览器");
    } else if (agent.contains("Firefox")) {
      // 火狐
      System.out.println("火狐浏览器");
    }
  }

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