一、repuset对象和response对象的原理

  1. request和response对象是有服务器创建的,我们可以使用

  2. request对象是来获取请求消息,response对象是来设置响应消息

二、request对象继承体系结构:

  ServletRequest -- 接口
            继承

  HttpServletRequest -- 接口
            实现
org.apache.catalina.connector.RequestFacade 类(tomcat)

三、request功能:

  1. 获取请求消息数据:

    1. 获取请求行数据

      1. 获取请求方法:String getMethod()

      2. 获取虚拟目录:String getContextPath()
      3. 获取Servlet路径:String getServletPath()
      4. 获取get方式请求参数:String getQueryString()
      5. 获取请求的URI: String getRequestURI()  StringBuffer getRequestURL():http://localhost/day14/demo1
      6. 获取协议及版本号:String getProtocol()
      7. 获取客户机的IP地址: String getRemoteAddr()

代码:

 1 package cn.aikang.Servlet;
 2
 3 import javax.servlet.ServletException;
 4 import javax.servlet.annotation.WebServlet;
 5 import javax.servlet.http.HttpServlet;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 import java.io.IOException;
 9
10 /**
11  * @Author: 艾康
12  * @Date: 2019/10/15 10:16
13  */
14 @WebServlet("/servlettest5")
15 public class ServletTest5 extends HttpServlet {
16     @Override
17     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
18     //获取请求行数据并输出
19         //获取请求方式
20         System.out.println(req.getMethod());
21         //获取虚拟目录
22         System.out.println(req.getContextPath());
23         //获取Servlet路径
24         System.out.println(req.getServletPath());
25         //获取get方式请求参数
26         System.out.println(req.getQueryString());
27         //获取请求的URL
28         System.out.println(req.getRequestURL());
29         //获取请求的URI
30         System.out.println(req.getRequestURI());
31         //获取协议版本号
32         System.out.println(req.getProtocol());
33         //获取客户机的IP
34         System.out.println(req.getRemoteAddr());
35     }
36
37     @Override
38     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
39         this.doGet(req,resp);
40     }
41 }
02-13 19:35