jsp图片显示出错

Question

页面从数据库读取图片的地址,图片在存入数据前被进行过大小处理.结果不能显示.我把没处理过的图片放到相同路径,能够正常形式.图片处理代码:
public class convertImage {    
    private String fileInput ;
    private String fileOutput ;
    private int nw ;//转换后的图片宽
    private int nh ;//转换后的图片高
    public convertImage()
    {
        
    }
    public String getFileInput() {
        return fileInput;
    }
    public void setFileInput(String fileInput) {
        this.fileInput = fileInput;
    }
    public String getFileOutput() {
        return fileOutput;
    }
    public void setFileOutput(String fileOutput) {
        this.fileOutput = fileOutput;
    }
    public void setImage(int nw,int nh) {
        this.nw=nw;
        this.nh=nh;
    }
    public void convert()
    {
     //BufferedImage src = ImageIO.read(new File("c:\\test.png"));//or png.
        //BufferedImage dest = new BufferedImage(src.getWidth()/2, src.getHeight()/2, BufferedImage.TYPE_INT_RGB);
        //dest.getGraphics().drawImage(src,0,0,src.getWidth()/2, src.getHeight()/2,null);
        //ImageIO.write(dest, "jpeg", new File("C:\\small.jpg"));        try {
            File fi = new File(fileInput); //大图文件
            File fo = new File(fileOutput); //将要转换出的小图文件
            AffineTransform transform = new AffineTransform();
            BufferedImage bis = ImageIO.read(fi);
            int w = bis.getWidth();
            int h = bis.getHeight();
            if(w<=nw||h<=nh)
            {
             //AffineTransformOp ato = new AffineTransformOp(transform,null);
                BufferedImage bid = new BufferedImage(w,h,BufferedImage.TYPE_3BYTE_BGR);
                //ato.filter(bis,bid);
                bid.getGraphics().drawImage(bis,0,0,w,h,null);
                ImageIO.write(bid,"jpeg",fo);
                return;
            }
            double sx = (double)nw/w;
            double sy = (double)nh/h ;
            //判断是横向图形还是坚向图形
            if ( w > h ) //横向图形
            {
                if ( (int)(sx * h ) > nh  ) //比较高不符合高度要求,就按高度比例
                {
                    sx = sy ;
                    nw = (int)(w*sx) ;
                }
                else
                {
                    sy = sx ;
                    nh = (int)( h*sy) ;
                }
            }
            else
            {
                if ( (int)(sy * w ) > nw ) 
                {
                    sy = sx ;
                    nh = (int)(h * sy ) ;
                }
                else
                {
                    sx = sy ;
                    nw = (int)(w*sx) ;
                }
            }            transform.setToScale(sx,sy);
            //AffineTransformOp ato = new AffineTransformOp(transform,null);
            BufferedImage bid = new BufferedImage(nw,nh,BufferedImage.TYPE_3BYTE_BGR);
            //ato.filter(bis,bid);
            bid.getGraphics().drawImage(bis,0,0,nw,nh,null);
            ImageIO.write(bid,"jpeg",fo);
        } 
        catch(Exception e) 
        {
            e.printStackTrace();
        }
    }    
}