关于jsp生成验证码图片的问题
我准备写个jsp生成验证码的例子,在网上找了个：
hehe.jsp
<%@ page contentType= "text/html;charset=GBK "
import= "java.awt.*,java.awt.image.*,java.util.*,javax.imageio.* "
pageEncoding= "GBK "%>
<html>
<body>
<%!Color getRandColor(int fc, int bc) {//给定范围获得随机颜色
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);
}%> <%
//设置页面不缓存
response.setHeader( "Pragma ", "No-cache ");
response.setHeader( "Cache-Control ", "no-cache ");
response.setDateHeader( "Expires ", 0);
// 在内存中创建图象
int width = 60, height = 20;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 获取图形上下文
Graphics g = image.getGraphics();
//生成随机类
Random random = new Random();
// 设定背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
//设定字体
g.setFont(new Font( "Times New Roman ", Font.PLAIN, 18));
//画边框
//g.setColor(new Color());
//g.drawRect(0,0,width-1,height-1);
// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
g.setColor(getRandColor(160, 200));
for (int i = 0; i < 100; 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);
}
// 取随机产生的认证码(4位数字)
String sRand = " ";
for (int i = 0; i < 4; i++) {
String rand = String.valueOf(random.nextInt(10));
sRand += rand;
// 将认证码显示到图象中
g.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));//调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
g.drawString(rand, 13 * i + 6, 16);
}
// 将认证码存入SESSION
session.setAttribute( "code ", sRand);
// 图象生效
g.dispose();
// 输出图象到页面
ImageIO.write(image, "JPEG ", response.getOutputStream());
%>
</body>
</html>
validatecode.jsp
<%@ page contentType= "text/html;charset=GBK "%>
<html>
<body>
<%@ include file= "hehe.jsp "%>
<br /> <br /> <br /> <br />
<center>
<form name= "f1 " action= "?type=validate " method= "post " >
<br />
请输入上面的验证码: <input type= "text " name= "t1 " value= " " /> <br />
<input type= "submit " value= "提交 " />
</form>
</center>
</body>
</html>
两个页面单独访问都是没有问题的，但是当validatecode.jsp包含hehe.jsp时，validatecode.jsp中表单里的text和submit都不显示了，谁能指点下
[解决办法]
你怎么用包含呀.直接用img src= "aa.jsp "就可以的.
例: <html:img src= "validateCode.jsp " width= "50 " height= "20 "/>
网上这方面很多的.
