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<%@ page contentType="image/jpeg"pageEncoding="gb2312"%>
<%@ page import="java.awt.*,java.awt.image.*"%>
<%@ page import="java.util.*,javax.imageio.*"%>

<%!
//產(chǎn)生隨機(jī)顏色函數(shù)getRandColor
Color getRandColor(int fc,int bc){
   Random r=new Random();
   if(fc>255) fc=255;
   if(bc>255) bc=255;
   int red=fc+r.nextInt(bc-fc); //red
   int green=fc+r.nextInt(bc-fc); //green
   int blue=fc+r.nextInt(bc-fc); //blue
   return new Color(red,green,blue);
}
%>
<%
//設(shè)置頁面不緩存
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires",0);

//創(chuàng)建隨機(jī)類
Random r=new Random();

//在內(nèi)存中創(chuàng)建圖像，寬度為width,高度為height
int width=60,height=20;
BufferedImage pic=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

//獲取圖形上下文環(huán)境
Graphics gc=pic.getGraphics();

//設(shè)定背景圖形上下文填充
gc.setColor(getRandColor(200,250));
gc.fillRect(0,0,width,height);

//設(shè)定圖形上下文環(huán)境字體
gc.setFont(new Font("Times New Roman",Font.PLAIN,18));

//隨機(jī)產(chǎn)生200條干擾直線，使圖像中的認(rèn)證碼不易被其他分析程序探測(cè)
gc.setColor(getRandColor(160,200));
for(int i=0;i<200;i++){
   int x1=r.nextInt(width);
   int y1=r.nextInt(height);
   int x2=r.nextInt(15);
   int y2=r.nextInt(15);
   gc.drawLine(x1,y1,x1+x2,y1+y2);
}

//隨機(jī)產(chǎn)生100個(gè)干擾點(diǎn)，使圖像中的驗(yàn)證碼不易被其他分析程序探測(cè)到
gc.setColor(getRandColor(120,240));
for(int i=0;i<100;i++)
{
   int x=r.nextInt(width);
   int y=r.nextInt(height);
   gc.drawOval(x,y,0,0);  
}
//隨機(jī)產(chǎn)生4位數(shù)字的驗(yàn)證碼
String RS="";
String rn="";
for(int i=0;i<4;i++){
   //產(chǎn)生10以內(nèi)的隨機(jī)數(shù)字rn
   rn=String.valueOf(r.nextInt(10));
   RS+=rn;
   //將認(rèn)證碼用drawString函數(shù)顯示到圖像里
   gc.setColor(new
    Color(20+r.nextInt(110),20+r.nextInt(110),20+r.nextInt(110)));
   gc.drawString(rn,13*i+6,16);
}

//釋放圖形上下文環(huán)境
gc.dispose();

//將認(rèn)證碼RS存入SESSION中共享
session.setAttribute("random",RS);

//輸出生成后的驗(yàn)證碼圖像到頁面
ImageIO.write(pic,"jpeg",response.getOutputStream());
%>

效果圖如下: