为什么小弟我的登录界面不显示验证码
为什么我的登录界面不显示验证码,
我是基于Windows XP开发的,开发工具是MyEclipse7.0,发布用tomcat5.5。框架是
hibernate3.2+struts2.0+spring2.5,数据库用的SQL Server2000和SP4补丁包。
登录界面login.jsp部分源码:
tr
td align= right 校验码 /td
td INPUT maxLength=4 size=16 name= code1 tabindex= 3 img src=
showCheckCode.jsp /td
/tr
showCheckCode.jsp源码如下:
%@ page
import= java.awt.*,java.awt.image.*,java.util.*,javax.imageio.* %
%@ page import= java.io.OutputStream %
%@ page contentType= text/html;charset=gb2312 %
%!Color getRandColor(int fc, int bc) {
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);
}%
%
try {
response.setHeader( Pragma , No-cache );
response.setHeader( Cache-Control , no-cache );
response.setDateHeader( Expires , 0);
int width = 60, height = 20;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
OutputStream os = response.getOutputStream();
Graphics g = image.getGraphics();
Random random = new Random();
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
g.setFont(new Font( Times New Roman , Font.PLAIN, 18));
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);
}
String sRand = ;
for (int j = 0; j 4; j++) {
String rand = String.valueOf(random.nextInt(10));
sRand += rand;
g.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
g.drawString(rand, 13 * j + 6, 16);
}
session.setAttribute( rand , sRand);
g.dispose();
ImageIO.write(image, JPEG , os);
os.flush();
os.close();
os = null;
response.flushBuffer();
out.clear();
out = pageContext.pushBody();
} catch (IllegalStateException e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
%
两个jsp放在同一
下,我试过用绝对路径,也还是不显示。校验码的图片显示时红叉。我让别人登录我的界面试了,也显示红叉,不显示图片。
------最佳解决
--------------------------------------------------------
校验码的图片显示时红叉。说明你的图片没有生产。
改下这句ImageIO.write(image, JPEG , os);
下面是ImageIO的 API
public static boolean write(RenderedImage im,
String formatName,
File output)