。用JSP做验证码刷新时没刷新

。用JSP做验证码刷新时没刷新 åœ?çº?ç?‰é??手指ç‚?ã?‚ã?‚ã?‚ç??JSPå?šéªŒè??ç •åˆ?æ??æ??æ??åˆ?æ?? è??ä?ªæ??å›?片ç?Ÿæˆ?çš„jspï,š %@ page contentType= image/jpeg import= java.awt.*, java.awt.image.*,java.util.*,javax.imageio.* pageEncoding= GB2312 % % // åœ?内å??ä??创å?ºå›?è?? int width=60, height=20; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // è??å ?å›?å??ä?Šä?‹æ?‡ Graphics g = image.getGraphics(); // è??å?šèƒŒæ??è‰? g.setColor(new Color(0xDCDCDC)); g.fillRect(0, 0, width, height); //ç??è??æ?† g.setColor(Color.black); g.drawRect(0,0,width-1,height-1); // éš?机äº?ç?Ÿçš„è?,è??ç •(4ä??æ??å??) String rand = + (Math.random()*10000); rand = rand.substring(0,rand.indexOf( . )); System.out.println( rand: +rand); switch(rand.length()) { case 1: rand = rand+ 000 ; break; case 2: rand = rand+ 00 ; break; case 3: rand = rand+ 0 ; break; default: rand = rand.substring(0,4); break; } System.out.println( rand: +rand); // å?†è?,è?•ç •å??å…,SESSION session.setAttribute( rand ,rand); // å?†è?,è?•ç •æ??ç,ºåˆ?å›?è??ä?? g.setColor(Color.black); Integer tempNumber = new Integer(rand); String numberStr = tempNumber.toString(); g.setFont(new Font( Atlantic Inline ,Font.PLAIN,18)); String Str = numberStr.substring(0,1); g.drawString(Str,8,17); Str = numberStr.substring(1,2); g.drawString(Str,20,15); Str = numberStr.substring(2,3); g.drawString(Str,35,18); Str = numberStr.substring(3,4); g.drawString(Str,45,15); // éš?机äº?ç?Ÿ88ä?ªå??æ‰?ç‚?ï,Œä??å›?è??ä??çš„è?,è??ç •ä??æ??è??å…?å ?ƒç?‹åº?æ??测åˆ? Random random = new Random(); for (int i=0;i 20;i++) { int x = random.nextInt(width); int y = random.nextInt(height); g.drawOval(x,y,0,0); } // å›?è??ç?Ÿæ?ˆ g.dispose(); // è??出å›?è??åˆ?é?µé ? ImageIO.write(image, JPEG ,response.getOutputStream()); //åœ?é?µé??ä?Šè?ƒç?? img src= /yourPath/checkNum.jsp / out . clear(); out = pageContext.pushBody(); % å?šæµ‹è??çš„éƒ?分ä??ç •ï,š script type= text/javascript function refresh(){ document.myform.image.src = code.jsp ; } /script body img name= image src= code.jsp a href= javascript:refresh() 看ä??æ?…?æ??ä??å, /a /body ------è??å†?æ??æ?ˆ-------------------------------------------------------- ä??懂â?,â?,å??ä??了ä? ------è??å†?æ??æ?ˆ-------------------------------------------------------- ç??çš„æ??IEæµ?è?ˆå??å??ï,ŒIEæ??有ç,?å??çš„ï,Œç??ç‹?æµ?è?ˆå??å??æ??有è??ç? é??é?? å ?ä??åœ?URLé??æ?,å??é??åŠ ä?ªåŠ?æ??çš„å??é‡?ï,ŒéªŒè??ç •å??ä,šåˆ? æ??了