HTTP request以及response原理 request请求消息数据

package cn.itcast.web.request;

import jdk.nashorn.internal.objects.AccessorPropertyDescriptor;

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;

//1.获取请求方式：GET
// String getMethod()
// 2.()获取虚拟目录
// String getContextPath()
// 3. 获取Servlet路径：/demo1
// String getServletPath()
// 4.获取get方式请求参数：name=zhangsan&age=12 question?使用html提交标签可以将数据上传
// String getQueryString()
// 5.()获取请求的 uri：统一资源标识符 URL：统一资源定位符
// getRequestURI();
// String getRequestURL();
// 6.获取协议以及版本：HTTP/1.1
// String getProtocol()
// 7.获取客户端的ip地址
// String getRemoteAddr();
// */

@WebServlet("/requestdemo1")
public class requestdemo1 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

    //1获取请求方式:get
    String method = req.getMethod();
    System.out.println(method);
    //2获取虚拟目录
    String contextPath = req.getContextPath();
    System.out.println(contextPath);
    //3获取servlet路径
    String servletPath = req.getServletPath();
    System.out.println(servletPath);
    //4获取get方式请求参数
    String  queryString = req.getQueryString();
    System.out.println(queryString);
    //5获取uri，url
    String requestURI = req.getRequestURI();
    StringBuffer requestURL = req.getRequestURL();
    System.out.println(requestURI);
    System.out.println(requestURL);
    //6获取协议以及版本
    String protocol = req.getProtocol();
    System.out.println(protocol);
    //7获取客户机的ip地址
    String remoteAddr = req.getRemoteAddr();
    System.out.println(remoteAddr);
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

}

}