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 }