Web应用系统开发技术 西南石油大学 实验3 作业答案 完整工程文件 (仅供学习)

package com.example.web.request; import javax.servlet.*; import javax.servlet.http.*; import javax.servlet.annotation.*; import java.io.IOException; import java.util.Map; /** * request 通用方式获取请求参数 */ @WebServlet("/req2") public class RequestDemo2 extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //GET请求逻辑 //System.out.println("get...."); //1. 获取所有参数的Map集合 Map<String, String[]> map = req.getParameterMap(); for (String key : map.keySet()) { // username:zhangsan lisi System.out.print(key+":"); //获取值 String[] values = map.get(key); for (String value : values) { System.out.print(value + " "); } System.out.println(); } System.out.println("------------"); //2. 根据key获取参数值，数组 String[] hobbies = req.getParameterValues("hobby"); for (String hobby : hobbies) { System.out.println(hobby); } //3. 根据key 获取单个参数值 String username = req.getParameter("username"); String password = req.getParameter("password"); System.out.println(username); System.out.println(password); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //POST请求逻辑 this.doGet(req,resp); /*System.out.println("post...."); //1. 获取所有参数的Map集合 Map<String, String[]> map = req.getParameterMap(); for (String key : map.keySet()) { // username:zhangsan lisi System.out.print(key+":"); //获取值 String[] values = map.get(key); for (String value : values) { System.out.print(value + " "); } System.out.println(); } System.out.println("------------"); //2. 根据key获取参数值，数组 String[] hobbies = req.getParameterValues("hobby"); for (String hobby : hobbies) { System.out.println(hobby); } //3. 根据key 获取单个参数值 String username = req.getParameter("username"); String password = req.getParameter("password"); System.out.println(username); System.out.println(password);*/ } }