来源：我的学习笔记
代码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
(相关资料图)
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>login</title>
</head>
<body>
<form action="user-login" method="post">
<!-- action的路径是LoginServlet中的urlpattern路径 -->
<filedset>
<legend>用户登录</legend>
<p>
<lable>
用户名:<input type="text" name="username"/>
<!-- 这里面的username/password要和LoginServlet中的getParameter("XXXX")保持一致 -->
</lable>
</p>
<lable>
密 码:<input type="text" name="password"/>
</lable>
</p>
<lable>
<input type="submit" value="登录"/>
<input type="reset" value="取消"/>
</lable>
</p>
</filedset>
</form>
</body>
</html>
代码：
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class LoginServlet
*/
@WebServlet(name = "LoginServlet", urlPatterns = { "/user-login" }) /* 要和JSP文件表单中的action路径保持一致 */
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public LoginServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String username = request.getParameter("username");/* 用来接受来自JSP文件中的表单数据 */
String password=request.getParameter("password");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out=response.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html><body>");
if ("123456".equals(username) && "123456".equals(password)) {/* 设置用户名，密码都为123456 */
out.println("登录成功！欢迎您,"+username);
}else {
out.println("对不起！您的用户名或者密码不对");
}
out.println("</body></html>");
}
}
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