7.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HttpServletResquest，通过HttpServletResquest的方法可以获得客户端的所有信息
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>用户登录</title>
</head>
<body>
<h2>请登录</h2>
<div>
<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：<br>
<input type="checkbox" name="hobbys" value="唱">唱<br>
<input type="checkbox" name="hobbys" value="跳">跳<br>
<input type="checkbox" name="hobbys" value="rap">rap<br>
<input type="checkbox" name="hobbys" value="篮球">篮球<br>
<input type="submit">
</form>
</div>
</body>
</html>
public class RequestDemo 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("+++++++++++++++++++++++");
req.getRequestDispatcher("/success.jsp").forward(req,resp);
}
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h2><font color="green">登录成功</font></h2>
</body>
</html>
需注意转发只要写文件名即可