为什么小弟我的登录界面不显示验证码

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放在同一目录下，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)