HTTPServletRequest

HTTPServletRequest

  • 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；

获取参数，请求转发

  • 获取参数的两个常用方法

    img

  • 编写登陆的类

    @WebServlet("/login")
public class LoginServlet 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[] hobbies = req.getParameterValues("hobby");
        System.out.println("================================");
        System.out.println(username);
        System.out.println(password);
        System.out.println(Arrays.toString(hobbies));
        System.out.println("================================");
        resp.setCharacterEncoding("utf-8");
        req.getRequestDispatcher("success.jsp").forward(req,resp);
    }
}

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
<h2>Hello World!</h2>
<%--这里提交的路径，需要寻找到项目的路径--%>
<%--${pageContext.request.contextPath}代表当前的项目--%>
<form action="${pageContext.request.contextPath}/login" method="post">
    用户名：<input type="text" name="username"> <br>
    密码：<input type="password" name="password"> <br>
    爱好：
    <input type="checkbox" name="hobby" value="打球">打球
    <input type="checkbox" name="hobby" value="游泳">游泳
    <input type="checkbox" name="hobby" value="睡觉">睡觉
    <br>
    <input type="submit">
</form>
</body>
</html>

success.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>Success</h1>
</body>
</html>
posted @ 2021-05-25 13:53  saxon宋  阅读(141)  评论(0)    收藏  举报