入门servlet：request获取请求行数据

 /**
  * 演示Request对象获取请求行数据
  */
 @WebServlet("/test")
 public class RequestDemo1 extends HttpServlet {
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

     }

     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         //一、获取请求行
         //1.获取请求方式：GET
         String method = request.getMethod();
         System.out.println(method);
         //2.（*）获取虚拟目录：/request
         String contextPath = request.getContextPath();
         System.out.println(contextPath);
         //3.获取Servlet路径：/demo
         String servletPath = request.getServletPath();
         System.out.println(servletPath);
         //4.获取get方式请求参数：name=zhangshan
         String queryString = request.getQueryString();
         System.out.println(queryString);
         //5.（*）获取请求URI：/request/demo
             //* String getRequestURI（）： /request/demo
         String requestURI = request.getRequestURI();
         System.out.println(requestURI);
         //* StringBuffer getRequestURI（）：http：//localhost/request/demo
         StringBuffer requestURL = request.getRequestURL();
         System.out.println(requestURL);
         //6.获取协议及版本：HTTP/1.1
         String protocol = request.getProtocol();
         System.out.println(protocol);
         //7.获取客户机的IP地址：
             //*String getRemoteAddr（）
         String remoteUser = request.getRemoteUser();
         System.out.println(remoteUser);
     }
 }