HttpServletRequest
HttpServletRequest代表客户端的请求，用户通过Http协议访问客户端时，客户端中的所有信息会被封装保存在HttpServletRequest中，再通过HttpServletRequest中的方法，可以获得客户端的所有信息
编写代码
LoginServlet
package com.hao.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Arrays;
public class LoginServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setCharacterEncoding("utf-8");
req.setCharacterEncoding("utf-8");
String username = req.getParameter("username");
String password = req.getParameter("password");
String[] hobbies = req.getParameterValues("hobbies");
System.out.println(username);
System.out.println(password);
System.out.println(Arrays.toString(hobbies));
req.getRequestDispatcher("/success.jsp").forward(req,resp);
// resp.sendRedirect("/Request_war/success.jsp");
}
}
index.jsp
<%--
Created by IntelliJ IDEA.
User: 15983
Date: 2021/7/23
Time: 10:46
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录</title>
</head>
<h1>登录</h1>
<body>
<form action="${pageContext.request.contextPath}/login" method="post" style="text-align: center">
用户名称: <input type="username" name="username"> <br>
用户密码: <input type="password" name="password"> <br>
用户爱好: <input type="checkbox" name="hobbies" value="fit">健身
<input type="checkbox" name="hobbies" value="read">看书
<input type="checkbox" name="hobbies" value="game">游戏
<input type="checkbox" name="hobbies" value="eat">吃饭 <br>
<input type="submit" name="submit">
</form>
</body>
</html>
success.jsp
<%--
Created by IntelliJ IDEA.
User: 15983
Date: 2021/7/23
Time: 10:57
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>登陆成功</h1>
</body>
</html>
编写映射
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.hao.Servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
测试访问
