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<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>imooc - Login 
dologin.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"    pageEncoding="utf-8"%><%    String path = request.getContextPath();    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";    String username = "";    String password = "";    request.setCharacterEncoding("utf-8");    username = request.getParameter("username");    password = request.getParameter("password");    if("admin".equals(username)&&"admin".equals(password)){        request.getRequestDispatcher("login_success.jsp").forward(request, response);        session.setAttribute("username", username);    } else {        response.sendRedirect("login_failure.jsp");    }%>   login_success.jsp
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>imooc - Login 
login_failure.jsp
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>imooc - Login 登录失败,请检查用户名密码; 返回登陆页面