<%! Color getRandColor(int fc,int bc){//random color Random random = new Random(); if(fc>255) fc=255; if(bc>255) bc=255; int r=fc+random.nextInt(bc-fc); int g=fc+random.nextInt(bc-fc); int b=fc+random.nextInt(bc-fc); return new Color(r,g,b); } %> <% //page no cache response.setHeader("Pragma","No-cache"); response.setHeader("Cache-Control","no-cache"); response.setDateHeader("Expires", 0);
// create image in memory int width=60, height=20; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// get GraphicContext Graphics g = image.getGraphics();
Random random = new Random();
// set background g.setColor(getRandColor(200,250)); g.fillRect(0, 0, width, height);
//set font g.setFont(new Font("Times New Roman",Font.PLAIN,18));
// generate confusing lines g.setColor(getRandColor(160,200)); for (int i=0;i<155;i++) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt(12); int yl = random.nextInt(12); g.drawLine(x,y,x+xl,y+yl); }
// 4 bit random number 随即写出4个数字 String sRand=""; for (int i=0;i<4;i++){ String rand=String.valueOf(random.nextInt(10)); sRand+=rand; // put validation code to image g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110))); g.drawString(rand,13*i+6,16); }
// save code to SESSION 传递图片中的数字 session.setAttribute("rand",sRand);
自己动手吧 有些东西不一定要等别人给你 自己可以查的到的
TKS 祝你成功.
<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%@ page contentType="image/jpeg" import="java.awt.*,
java.awt.image.*,javax.imageio.*,java.net.*" %>
<%!
Color getRandColor(int fc,int bc){//random color
Random random = new Random();
if(fc>255) fc=255;
if(bc>255) bc=255;
int r=fc+random.nextInt(bc-fc);
int g=fc+random.nextInt(bc-fc);
int b=fc+random.nextInt(bc-fc);
return new Color(r,g,b);
}
%>
<%
//page no cache
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
// create image in memory
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// get GraphicContext
Graphics g = image.getGraphics();
Random random = new Random();
// set background
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);
//set font
g.setFont(new Font("Times New Roman",Font.PLAIN,18));
//set border
//g.setColor(new Color());
//g.drawRect(0,0,width-1,height-1);
// generate confusing lines
g.setColor(getRandColor(160,200));
for (int i=0;i<155;i++)
{
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x,y,x+xl,y+yl);
}
// 4 bit random number 随即写出4个数字
String sRand="";
for (int i=0;i<4;i++){
String rand=String.valueOf(random.nextInt(10));
sRand+=rand;
// put validation code to image
g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
g.drawString(rand,13*i+6,16);
}
// save code to SESSION 传递图片中的数字
session.setAttribute("rand",sRand);
g.dispose();
// display image
ImageIO.write(image, "JPEG", response.getOutputStream());
out.clear();
out = pageContext.pushBody();
%>
Login.jsp<tr>
<td>
验证码:
</td>
<td>
<html:text property="image"></html:text>
</td>
<td>
<img width="60" height="20" src="<%=basePath%>/image.jsp">
</td>
</tr>
loginAction
String validatecode=(String)session.getAttribute("rand");
//获取image.jsp中传递的数字值
String inputcode=logonForm.getImage();
//从login.jsp中获取文本框输入的值
if(validatecode.equals(inputcode)){ //如果两个相等
登陆
}else
{
String error="验证码错误,请重新输入.....";
request.setAttribute("error", error);
return mapping.findForward("fail");
}
...要想要的话,加我的QQ我发给你啊..这里太长了..
..394777014