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通过Servlet实现用户登录

2015-09-30 14:27 204 查看

1.用户登录界面

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<h1> 使用Servlet实现用户登陆</h1>
<form action="servlet/doServlet" method="post" name="reguser">
<table>
<tr>
<td>用户名：</td>
<td><input type="text" name="username" /></td>
</tr>

<tr>
<td>密码：</td>
<td><input type="password" name="password"/></td>
</tr>

2.Servlet类代码

package servlet;

import java.io.IOException;
import javax.servlet.ServletConfig;
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 doServlet
*/
@WebServlet("/doServlet")
public class doServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public doServlet() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
// TODO Auto-generated method stub
}

/**
* @see Servlet#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String username = null;
String password="";
username=request.getParameter("username");
password=request.getParameter("password");
user  u= new user();

try{

u.setUsername(username);
u.setPassword(password);
//比较提交的用户信息是否合法
if("admin".equals(u.getUsername())&&"admin".equals(u.getPassword())){

request.getRequestDispatcher("/login-success.jsp").forward(request, response);
//将用户信息保存到session
request.getSession().setAttribute("reguser", u);
}else{

response.sendRedirect(request.getContextPath()+"/login-fail.jsp");

}

}catch(Exception e){

e.printStackTrace();

}

}

}

3.登陆成功界面代码

<%@ page language="java" contentType="text/html; charset=utf-8" import="servlet.user"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>

<h1>登陆成功</h1>
<%
user u=(user)request.getSession().getAttribute("reguser");

%>
用户名为：<%=u.getUsername() %>
<br>
密码为：<%=u.getPassword() %>
<br>

<jsp:useBean id="reguser" class="servlet.user" scope="session"></jsp:useBean>
用户名为：<%=reguser.getUsername() %>
<br>
密码为：<%=reguser.getPassword() %>
<br>

</body>
</html>

4.登录失败界面代码省略

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