526互联

JavaWeb--Request通用方式请求参数

发布时间 2023-11-15 21:10:21作者: na2co3-
package com.avb.web;

import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Map;

@WebServlet("/req2")
public class Servletdemo01 extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        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()){
            System.out.print(key+":");

            //获取值
            String[] values = map.get(key);
            for (String value : values){
                System.out.println(value+" ");
            }
            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 {
        this.doGet(req, resp);
    }
}

req.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<form action="req2" method="post">
    <input type="text" name="username"><br>
    <input type="password" name = "password"><br>
    <input type="checkbox" name="hobby" value="1">游泳
    <input type="checkbox" name="hobby" value="2">爬山<br>
    <input type="submit">

</form>
</body>
</html>