javaweb 6、HttpServletRequest

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

获取前端传递的参数，并请求转发#

创建model：request

更新index.jsp,创建跳转success.jsp

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录</title>
</head>
<body>

<h1>登录</h1>

<div>
    <!--这里表示的意思：以post方式提交表单，提交到到我们login请求-->
    <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="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>

success.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>

<h1>登录成功</h1>

</body>
</html>

创建LoginServlet.java

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");

        System.out.println("=============================");
        System.out.println("username");
        System.out.println("password");
        System.out.println(Arrays.toString(hobbys));
        System.out.println("=============================");

        System.out.println(req.getContextPath());
        req.getRequestDispatcher("/success.jsp").forward(req,resp);
    }

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

配置路由web.xml

<servlet>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>com.binzaza.servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/login</url-pattern>
</servlet-mapping>