jsp参考大全及源代码（jsp的代码）

1、jsp技术的验证码源代码？
2、jsp登陆界面源代码
3、jsp 中网站的首页源代码

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();

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

td用户名:input type=”text” name=”userName” id=”userName”/td

/tr

td密码:input type=”password” name=”password” id=”password”/td

/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

form name=”loginForm” action=”login_check.jsp” method=”post”

table Border=”0″

td账号/td

tdinput type=”text” name=”username”/td

/tr

td密码/td

tdinput type=”password” name=”password”

/td

/tr

/table

input type=”submit” value=”登录” style=”color:#BC8F8F”

/form

/center

/body

/html

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

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 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

原创文章，作者：R7EL6，如若转载，请注明出处：https://www.506064.com/n/126767.html

jsp参考大全及源代码（jsp的代码）

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