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**HttpServletRequest的作用：**获取前端的参数和请求转发
public class LoginServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("进入了这个请求");
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("==============================");
req.getRequestDispatcher("/success.jsp").forward(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}
index.jsp文件
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录</title>
</head>
<body>
<div style="text-align: center">
<%-- ${pageContext.request.contextPath}代表当前web应用，前端使用post请求，点击submit按钮会跳转到login页面--%>
<form action="${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
<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>
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