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java回登录界面代码 javagui登录界面( 二 )

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}
}
publicvoid close(ResultSet resultSet)
{
try{
if(resultSet!=null)
{
resultSet.close();
}
}catch(SQLException e)
{
e.printStackTrace();
}
}
}
2、login_check.jsp:文件
%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%
!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" ""
html
head
meta http-equiv="Content-Type" content="text/html; charset=utf-8"
title验证用户密码/title
/head
body
jsp:useBean id="util" class="util.Data_uil" scope="page" /
%
String username=(String)request.getParameter("username");
String password=(String)request.getParameter("password");
if(username==null||"".equals(username))
{
out.print("script language='javaScript' alert('用户名不能为空');/script");
response.setHeader("refresh", "0;url=user_login.jsp");
}
else
{
System.out.println("输入的用户名:"+username);
String passwordInDataBase=util.selectPassword(username);
System.out.println("密码："+passwordInDataBase);
if(passwordInDataBase==null||"".equals(passwordInDataBase))
{
out.print("script language='javaScript' alert('用户名不存在');/script");
response.setHeader("refresh", "0;url=user_login.jsp");
}
else if(passwordInDataBase.equals(password))
{
out.print("script language='javaScript' alert('登录成功');/script");
response.setHeader("refresh", "0;url=loginSucces.jsp");
}
else
{
out.print("script language='javaScript' alert('密码错误');/script");
response.setHeader("refresh", "0;url=user_login.jsp");
}
}
%
/body
/html
3、loginSucces.jsp文件
%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%
!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" ""
html
head
meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"
titleInsert title here/title
/head
body
hr size="10" width="26%" align="left" color="green"
font size="6" color="red" 登录成功 /font
hr size="10" width="26%" align="left" color="green"
/body
/html
4、user_login.jsp文件
%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%
!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" ""
html
head
meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"
title登录界面/title
/head
bodybackground="C:\Users\win8\workspace\Login\image\9dcbdc339e72a5663b5c289fb5573c13_10.jpg"
center
brbrbrbrbrbr
h1 style="color:yellow"Login/h1
br
form name="loginForm" action="login_check.jsp" method="post"
table Border="0"
tr
td账号/td
tdinput type="text" name="username"/td
/tr
tr
td密码/td
tdinput type="password" name="password"
/td
/tr
/table
br
input type="submit" value="https://www.04ip.com/post/登录" style="color:#BC8F8F"
/form
/center
/body
/html
实现界面登陆，退出功能的java代码怎么写？CS结构系统的退出如下：public void init() {\x0d\x0athis.setTitle("用户登录界面");\x0d\x0athis.add(createCenterPane());\x0d\x0athis.setDefaultCloseOperation(this.DO_NOTHING_ON_CLOSE);\x0d\x0athis.setSize(new Dimension(450, 335));\x0d\x0athis.setLocationRelativeTo(null);\x0d\x0a// this.setVisible(true);\x0d\x0athis.addWindowListener(new WindowAdapter() {\x0d\x0apublic void windowClosing(WindowEvent e) {\x0d\x0aint choose = JOptionPane.showConfirmDialog(null, "是否要退出登录界面？",\x0d\x0a"系统提示：", JOptionPane.YES_NO_OPTION);\x0d\x0aif (choose == JOptionPane.YES_OPTION) {\x0d\x0aSystem.exit(1);\x0d\x0a}\x0d\x0a}\x0d\x0a});\x0d\x0a }其中this为JFrame对象 。BS结构的退出直接用windows.close()方法就行了！

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