在java中对图像进行操作 格式转换 缩放

在一个3D Web项目使用了图片格式转换，缩放等。

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//defaultSuffix为jpg，不支持bmp
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public static final boolean resizeImage(String fileName, String suffix) throws Exception ...{
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boolean resized= false;
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BufferedImage input;
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if(suffix.equalsIgnoreCase("tif")||suffix.equalsIgnoreCase("tiff")||suffix.equalsIgnoreCase("png")) ...{//如果是tiff或者png
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RenderedImage image = JAI.create("fileload", TurbineServlet.getRealPath(imageRoot + fileName+"."+suffix));
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WritableRaster raster = image.copyData(null);
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BufferedImage bi = new BufferedImage( image.getColorModel(), raster, true, null);
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BufferedImage bi2 = new BufferedImage( maxResizeDimension, bi.getHeight()*maxResizeDimension/bi.getWidth(), BufferedImage.TYPE_INT_RGB);
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Graphics2D g2 = bi2.createGraphics();
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g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
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g2.setBackground(java.awt.Color.WHITE);//把tiff和png转换后的背景设置为白色
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g2.fillRect(0, 0, maxResizeDimension, bi.getHeight()*maxResizeDimension/bi.getWidth());
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g2.drawImage(bi, 0, 0, maxResizeDimension, bi.getHeight()*maxResizeDimension/bi.getWidth(), null);
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PlanarImage pi = PlanarImage.wrapRenderedImage(bi2);
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JAI.create("FileStore", pi, TurbineServlet.getRealPath(resizeRoot + fileName+"."+defaultSuffix).replaceAll("////","////////"), "JPEG", new JPEGEncodeParam());
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input = pi.getAsBufferedImage();
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int w = maxThumbDimension, h = maxThumbDimension;
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BufferedImage output = new BufferedImage(w, h, BufferedImage.TYPE_3BYTE_BGR);
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Graphics2D g = output.createGraphics();
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g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
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g.drawImage(input,0,0,w,h, null);
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ImageIO.write(output, defaultSuffix, new File(TurbineServlet.getRealPath(thumbRoot + fileName+"."+defaultSuffix)));
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}
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else ...{//如果是gif或者jpg
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input = ImageIO.read(new File(TurbineServlet.getRealPath(imageRoot + fileName+"."+suffix)));
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int w = maxThumbDimension, h = maxThumbDimension;
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BufferedImage output = new BufferedImage(w, h, BufferedImage.TYPE_3BYTE_BGR);
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Graphics2D g = output.createGraphics();
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g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
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g.drawImage(input,0,0,w,h, null);
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ImageIO.write(output, defaultSuffix, new File(TurbineServlet.getRealPath(thumbRoot + fileName+"."+defaultSuffix)));
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BufferedImage output2 = new BufferedImage(maxResizeDimension, input.getHeight()*maxResizeDimension/input.getWidth(), BufferedImage.TYPE_3BYTE_BGR);
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Graphics2D g2 = output2.createGraphics();
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g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
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g2.drawImage(input,0,0,maxResizeDimension, input.getHeight()*maxResizeDimension/input.getWidth(), null);
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ImageIO.write(output2, defaultSuffix, new File(TurbineServlet.getRealPath(resizeRoot + fileName+"."+defaultSuffix)));
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}
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resized = true;
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return resized;
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}
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