本文目录一览：
jsp技术的验证码源代码？
实际当中很少用这种纯JSP的验证码技术，缺乏安全性，下面有一个这样的纯JSP的例，参考别人的，你可以看看。
纯数字验证码
在JSP页面body区域编写如下代码：
导入java.awt.*,java.awt.image.BufferedImage,javax.imageio.ImageIO包
%
//验证码边框的长高
int width = 60;
int height = 20;
//用RGB模式输出图像区域
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//定义画笔
Graphics graph = image.getGraphics();
//设置验证码框背景色0-255
graph.setColor(new Color(200, 200, 200));
//填充矩形
graph.fillRect(0, 0, width, height);
//产生1000-9999之间的随机数
Random rnd = new Random();
int rndNum = rnd.nextInt(8999) + 1000;
//此处为何转换为String型的用int型的效果一样？
String rndStr = String.valueOf(rndNum);
session.setAttribute("rndStr", rndNum);
//设置矩形区域中随机数及干扰点的颜色
graph.setColor(Color.RED);
//设置随机数的字体大小
graph.setFont(new Font("",Font.PLAIN,20));
//在已有的矩形区域中绘制随机数
graph.drawString(rndStr, 8, 17);
//随机产生100个干扰点
for (int i = 0; i 100; i++)
{
int x = rnd.nextInt(width);
int y = rnd.nextInt(height);
//设置干扰点的位置长宽
graph.drawOval(x, y, 1, 1);
}
//将图像输出到页面上
ImageIO.write(image, "JPEG", response.getOutputStream());
//清空缓冲区
out.clear();
out = pageContext.pushBody();
%
jsp登陆界面源代码
1、login.jsp文件
%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%
%@ page import="java.util.*" %
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
title登录页面/title
/head
body
form name="loginForm" method="post" action="judgeUser.jsp"
table
tr
td用户名:input type="text" name="userName" id="userName"/td
/tr
tr
td密码:input type="password" name="password" id="password"/td
/tr
tr
tdinput type="submit" value="登录" style="background-color:pink" input
type="reset" value="重置" style="background-color:red"/td
/tr
/table
/form
/body
/html
2、judge.jsp文件
%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%
%@ page import="java.util.*" %
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
title身份验证/title
/head
body
%
request.setCharacterEncoding("GB18030");
String name = request.getParameter("userName");
String password = request.getParameter("password");
if(name.equals("abc") password.equals("123")) {
3、afterLogin.jsp文件
%
jsp:forward page="afterLogin.jsp"
jsp:param name="userName" value="%=name%"/
/jsp:forward
%
}
else {
%
jsp:forward page="login.jsp"/
%
}
%
/body
/html
%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
title登录成功/title
/head
body
%
request.setCharacterEncoding("GB18030");
String name = request.getParameter("userName");
out.println("欢迎你:" + name);
%
/body
/html
扩展资料：
java web登录界面源代码：
1、Data_uil.java文件
import java.sql.*;
public class Data_uil
{
public Connection getConnection()
{
try{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
}catch(ClassNotFoundException e)
{
e.printStackTrace();
}
String user="***";
String password="***";
String url="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=***";
Connection con=null;
try{
con=DriverManager.getConnection(url,user,password);
}catch(SQLException e)
{
e.printStackTrace();
}
return con;
}
public String selectPassword(String username)
{
Connection connection=getConnection();
String sql="select *from login where username=?";
PreparedStatement preparedStatement=null;
ResultSet result=null;
String password=null;
try{
preparedStatement=connection.prepareStatement(sql);
preparedStatement.setString(1,username);
result=preparedStatement.executeQuery();//可执行的 查询
if(result.next())
password=result.getString("password");
}catch(SQLException e){
e.printStackTrace();
}finally
{
close(preparedStatement);
close(result);
close(connection);
}
System.out.println("找到的数据库密码为："+password);
return password;
}
public void close (Connection con)
{
try{
if(con!=null)
{
con.close();
}
}catch(SQLException e)
{
e.printStackTrace();
}
}
public void close (PreparedStatement preparedStatement)
{
try{
if(preparedStatement!=null)
{
preparedStatement.close();
}
}catch(SQLException e)
{
e.printStackTrace();
}
}
public void 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
body background="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="登录" style="color:#BC8F8F"
/form
/center
/body
/html
jsp 中网站的首页源代码
这是最简单的一个例子，数据库要你自己建，用的是ACCESS
%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %
html
head
meta http-equiv="Content-Type" content="text/html; charset=gb2312"
titleJSP连接Access数据库/title
style type="text/css"
!--
.style1 {
font-size: 20px;
font-weight: bold;
}
--
/style
/headbody
div align="center" class="style1"JSP连接Access数据库/div
br
hr
p%
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); //载入驱动程序类别
Connection con = DriverManager.getConnection("jdbc:odbc:jspdata"); //建立数据库链接,jspdata为ODBC数据源名称
//建立Statement对象
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
ResultSet rs = stmt.executeQuery("select * from lyb"); //建立ResultSet(结果集)对象，并执行SQL语句
%
/p
p align="center"NUMB1数据表中记录如下/p
table width="640" border="1" align="center" bordercolor="#7188e0"
tr bgcolor="d1d1ff"
th width="49"编号/th
th width="90"姓名/th
th width="126"E-mail/th
th width="221"网站/th
th width="80"QQ/th
/tr
%
while(rs.next())
{
%
tr bgcolor="#f8f8f8"
th%= rs.getString(1) %/th
th%= rs.getString(2) %/th
th%= rs.getString(3) %/th
th bgcolor="#f6f6f8"%= rs.getString(4) %/th
th%= rs.getString(5) %/th
/tr
%
}
rs.close();
stmt.close();
con.close();
%
/table
p align="center"br
如果您能看到表格中的数据，说明连接数据库成功！/p
/body
/html
