登录页面

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h3>登录页面</h3>
	
	<form action="/day3/login" method="POST">
		账号: <input type="text" name="username"/><br/>
		密码: <input type="text" name="password"/><br/>
		<input type="submit" value="朕要登录"/>
	</form>
</body>
</html>

解决了中文乱码问题

package per.mjn._06_encoding;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

// 接收和处理登陆的信息
@WebServlet("/login")
public class LoginServlet extends HttpServlet{

	private static final long serialVersionUID = 1L;

	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//		System.out.println("LoginServlet.service()");
		// 对于POST请求, 可以设置请求的编码
		req.setCharacterEncoding("UTF-8");
		String username = req.getParameter("username");
		
//		// 1. 按照ISO-8859-1把乱码恢复成二进制形式
//		byte[] data = username.getBytes("ISO-8859-1");
//		// 2. 再把二进制形式的数据使用UTF-8重新编码
//		username = new String(data, "UTF-8");
		
		String password = req.getParameter("password");
		System.out.println(username + ", " + password);
	}
}