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1.login.jsp:µÇÂ¼Ò³Ãæ
2.code.jsp:Éú³ÉÑéÖ¤ÂëÍ¼Æ¬Ò³Ãæ
3.check.jsp:ÑéÖ¤½á¹û
code.jsp
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<%@ page contentType="image/jpeg" import="java.awt.*,
java.awt.image.*,java.util.*,javax.imageio.*" %>
<%
// ÔÚÄÚ´æÖд´½¨Í¼Ïó
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// »ñȡͼÐÎÉÏÏÂÎÄ
Graphics g = image.getGraphics();
// É趨±³¾°É«
g.setColor(new Color(0xDCDCDC));
g.fillRect(0, 0, width, height);
//»­±ß¿ò
g.setColor(Color.black);
g.drawRect(0,0,width-1,height-1);
// Ëæ»ú²úÉúµÄÈÏÖ¤Âë(4λÊý×Ö)
String rand =""+ (Math.random()*10000);
rand = rand.substring(0,rand.indexOf("."));
switch(rand.length())
{
case 1: rand = "000"+rand; break;
case 2: rand = "00"+rand; break;
case 3: rand = "0"+rand; break;
default: rand = rand.substring(0,4); break;
}
// ½«ÈÏÖ¤Âë´æÈëSESSION
session.setAttribute("rand",rand);
// ½«ÈÏÖ¤ÂëÏÔʾµ½Í¼ÏóÖÐ
g.setColor(Color.black);
Integer tempNumber = new Integer(rand);
String numberStr = tempNumber.toString();
g.setFont(new Font("Atlantic Inline",Font.PLAIN,18));
String Str = numberStr.substring(0,1);
g.drawString(Str,8,17);
Str = numberStr.substring(1,2);
g.drawString(Str,20,15);
Str = numberStr.substring(2,3);
g.drawString(Str,35,18);
Str = numberStr.substring(3,4);
g.drawString(Str,45,15);
// Ëæ»ú²úÉú88¸ö¸ÉÈŵ㣬ʹͼÏóÖеÄÈÏÖ¤Âë²»Ò×±»ÆäËü³ÌÐò̽²âµ½
Random random = new Random();
for (int i=0;i<20;i++)
{
int x = random.nextInt(width);
int y = random.nextInt(height);
g.drawOval(x,y,0,0);
}
// ͼÏóÉúЧ
g.dispose();
// Êä³öͼÏóµ½Ò³Ãæ
ImageIO.write(image, "JPEG", response.getOutputStream());
//ÔÚÒ³ÃæÉϵ÷Óà <img src="/yourPath/checkNum.jsp" />
%>
login.jsp
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