Request 根据用户输入的信息获取输入到控制台

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html代码

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>注册页面</title>

</head>

<body>

<form action="/register" method="post">

    <input type="text" placeholder="用户名" name="username">

    <input type="password" placeholder="密码" name="password">

    <input type="checkbox" name="hobby" value="lq">篮球

    <input type="checkbox" name="hobby" value="zq">足球

    <input type="checkbox" name="hobby" value="ppq">乒乓球

    <input type="checkbox" name="hobby" value="ymq">羽毛球

    <input type="submit" value="注册">

</form>

</body>

</html>

java代码

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;

import java.util.*;

/**

 * @author shkstart

 * @create 2021-01-12 22:19

 */

@WebServlet("/register")

public class RegisterServlet extends HttpServlet {

    @Override

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

        doGet(req, resp);

    }

    @Override

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {

        // 封装了对应的获取表单中的参数信息的api方法

        // 如果请求中携带的有中文信息 需要设置编码字符集

        // 从tomcat8开始优化编码字符集，针对get请求

        // 对于post请求需要手动指定

        req.setCharacterEncoding("UTF-8");

        // 获取用户名

        String username = req.getParameter("username");

        System.out.println(username);

        System.out.println("---------------------------------------------------");

        // 获取所有的值封装到map集合中

        Map<String, String[]> map = req.getParameterMap();

        Set<String> set = map.keySet();

        Iterator<String> iterator = set.iterator();

        // 遍历set集合

        while (iterator.hasNext()) {

            String name = iterator.next();

            String[] values = map.get(name);

            System.out.println(name + "------" + Arrays.toString(values));

        }

        System.out.println("---------------------------------------------------");

        // commons-beanUtils

        Enumeration<String> names = req.getParameterNames();

        while (names.hasMoreElements()) {

            String name = names.nextElement();

            String[] values = req.getParameterValues(name);

            System.out.println(name + "------" + Arrays.toString(values));

        }

        System.out.println("---------------------------------------------------");

        String[] hobbies = req.getParameterValues("hobby");

        System.out.println("hobby------" + Arrays.toString(hobbies));

    }

}