Java Web学习Day03 HttpServletRequest

Java Web学习Day03 HttpServletRequest

Request

​ HttpServletRequest代表客户端的请求，用户通过Http协议访问服务器，HTTP请求中的所有信息会
被封装到HttpServletRequest,通过这个HttpServletRequest的方法, 获得客户端的所有信息

1、获取前端传递的参数

2、请求转发

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 {
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");

        String username = req.getParameter("username");
        String password = req.getParameter("password");
        String [] hobbys = req.getParameterValues("hobbys");
//      后台接收中文乱码问题
        System.out.println("=======================");
        System.out.println(username);
        System.out.println(password);
        System.out.println(Arrays.toString(hobbys));
        System.out.println("======================");
//        通过请求转发
        req.getRequestDispatcher("/success.jsp").forward(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
<%--这里提交的路径需要寻找到项目的路径--%>

<div style="text-align: center">
<%--${pageContext.request.contextPath} 代表当前项目--%>
    <%-- method="post" 以post方式提交表单，提交到我们的login请求--%>
<form action="${pageContext.request.contextPath}/login" method="post">
    用户名：<input type="text" name="username">
    密码：<input type="password" name="password">
    爱好:
    <input type="checkbox" name="hobbys" value="女孩">女孩
    <input type="checkbox" name="hobbys" value="代码">代码
    <input type="checkbox" name="hobbys" value="唱歌">唱歌
    <input type="checkbox" name="hobbys" value="电影">电影
    <br>

    <input type="submit">
</form>
</div>
</body>
</html>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>成功</h1>
</body>
</html>
posted @ 2021-07-18 16:08  爱学习的蓝天  阅读(49)  评论(0)    收藏  举报