public class LoginServlet extends HttpServlet{
private final String SUCCESS_VIEW = "MyJsp.jsp";
private final String ERROR_VIEW = "index.jsp";
private UsersDao userDao = new UsersDao();
private BaseDao basedao = new BaseDao();
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
//1.防止乱码
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
//2.获取页面信息
String username = request.getParameter("username");
String password = request.getParameter("password");
//3.获取登录用户信息
request . getSession().setAttribute ( "UserName" , username ) ;
request.getSession().setAttribute("password", password);
Connection con=null;
//4.验证操作，将用户信息封装到currentUser
try {
Users user = new Users(username,password);
con = basedao.getConnection();
Users currentUser = userDao.login(con, user);
if (null == currentUser) {
//5.输入信息错误
request.setAttribute("error", "用户名或密码错误");
request.setAttribute("userName", username);
request.setAttribute("password", password);
RequestDispatcher dispatcher = request.getRequestDispatcher(ERROR_VIEW);
dispatcher.forward(request, response);
}else {
//6.输入正确的信息
HttpSession session = request.getSession();
session.setAttribute("currentUser",currentUser);
response.sendRedirect(SUCCESS_VIEW );
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
LoginServlet
<body>
<h1>登录</h1>
<form action="textServlet" method="post">
用户名：<input type="text" name="username" value="${username}" /><br/>
密 码：<input type="password" name="password" value=""/><br/>
<input type="submit" value="登录"/>
<a href="regist.jsp">注册</a>
</form>
<font color="red">${error}</font>
</body>
<%
String userName = ( String ) session. getAttribute ( "UserName" ) ;
%>
<div align = center>
欢迎登陆
用户：<%=userName%>