初试form表单提交信息

有四种提携带信息的方法：通过url中的token，通过form表单中的隐藏域（通过form表单），通过cookies，通过session。这四种方式可以用来保存一个会话状态。

<%--
  Created by IntelliJ IDEA.
  User: woshi
  Date: 2020/3/23
  Time: 11:19
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>login_index</title>
</head>
<body>
<table>
    <form action="/login" method="post">
        <input type="hidden" name="hidden" value="hidden_value">
        <input type="hidden" name="duplicate" value="1">
        <input type="hidden" name="duplicate" value="2">
        用户名:<input type="text" name="username"><br>
        密码:<input type="password" name="password"><br>

        选择一种蓝色:
        红色:<input id="radios1" name="color" type="radio" value="红色" checked><br>
        黄色:<input id="radios2" name="color" type="radio" value="黄色" checked><br>
        蓝色:<input id="radios3" name="color" type="radio" value="蓝色" checked><br>

        选择一些字母:
        A:<input name="A" type="checkbox" ><br>
        B:<input name="B" type="checkbox" ><br>
        C:<input name="C" type="checkbox" ><br>

        <input type="submit" value="登录"><br>
    </form>
</table>
</body>
</html>

package com.woshi.servlet;

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;

@WebServlet("/login")
public class LoginFormTest extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        String hidden = req.getParameter("hidden");
        System.out.println(username);
        System.out.println(password);
        System.out.println(hidden);


        String duplicate = req.getParameter("duplicate");
        String color = req.getParameter("color");
        String letterCheck = req.getParameter("C");
        System.out.println(duplicate);
        System.out.println(color);
        System.out.println(letterCheck);
    }
}

admin
123123
hidden_value
1
蓝色
on

初试form表单提交信息

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