案例：java代码判断浏览器类型

淩亂°似流年 2022-02-19 15:05 724阅读 0赞

**原理：得到user-agent请求头，判断它的值是否包含了指定的字符串，区分不同的浏览器**

java代码：

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.io.PrintWriter;
    
    /** 判断浏览器的类型 */
    @WebServlet(name = "Demo3BrowserServlet", urlPatterns = "/demo3")
    public class Demo3BrowserServlet extends HttpServlet { 
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            response.setContentType("text/html;charset=utf-8");
            PrintWriter out = response.getWriter();
            //原理：得到user-agent请求头，判断它的值是否包含了指定的字符串，区分不同的浏览器
            //得到user-agent请求头的值
            String agent = request.getHeader("user-agent");
            out.print("您的浏览器是：");
            //判断字符串，Edge、Chrome、Safari、Firefox、IE浏览器或其它
            if (agent.contains("Edge")) { 
                out.print("Edge");
            }
            else if (agent.contains("Chrome")) { 
                out.print("Chrome");
            }
            else if (agent.contains("Safari")) { 
                out.print("Safari");
            }
            else if (agent.contains("Firefox")) { 
                out.print("Firefox");
            }
            else { 
                out.print("IE浏览器或其它");
            }
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
            this.doPost(request, response);
        }
    }