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>
启动tomcat
访问http://localhost:8080/r/login
