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828天前public static boolean compressPic(String srcFilePath, String descFilePath) throws IOException { |
File file = null; |
BufferedImage src = null; |
FileOutputStream out = null; |
ImageWriter imgWrier; |
ImageWriteParam imgWriteParams; |
// 指定写图片的方式为 jpg |
imgWrier = ImageIO.getImageWritersByFormatName("jpg").next(); |
imgWriteParams = new javax.imageio.plugins.jpeg.JPEGImageWriteParam( |
null); |
// 要使用压缩，必须指定压缩方式为MODE_EXPLICIT |
imgWriteParams.setCompressionMode(imgWriteParams.MODE_EXPLICIT); |
// 这里指定压缩的程度，参数qality是取值0~1范围内， |
imgWriteParams.setCompressionQuality((float) 1); |
imgWriteParams.setProgressiveMode(imgWriteParams.MODE_DISABLED); |
ColorModel colorModel =ImageIO.read(new File(srcFilePath)).getColorModel();// ColorModel.getRGBdefault(); |
// 指定压缩时使用的色彩模式 |
// imgWriteParams.setDestinationType(new javax.imageio.ImageTypeSpecifier( |
// colorModel, colorModel.createCompatibleSampleModel(16, 16))); |
imgWriteParams.setDestinationType(new javax.imageio.ImageTypeSpecifier( |
colorModel, colorModel.createCompatibleSampleModel(16, 16))); |
try { |
if (isBlank(srcFilePath)) { |
return false; |
} else { |
file = new File(srcFilePath);System.out.println(file.length()); |
src = ImageIO.read(file); |
out = new FileOutputStream(descFilePath); |
imgWrier.reset(); |
// 必须先指定 out值，才能调用write方法, ImageOutputStream可以通过任何 |
// OutputStream构造 |
imgWrier.setOutput(ImageIO.createImageOutputStream(out)); |
// 调用write方法，就可以向输入流写图片 |
imgWrier.write(null, new IIOImage(src, null, null), |
imgWriteParams); |
out.flush(); |
out.close(); |
} |
} catch (Exception e) { |
e.printStackTrace(); |
return false; |
} |
return true; |
} |
public static boolean isBlank(String string) { |
if (string == null || string.length() == 0 || string.trim().equals("")) { |
return true; |
} |
return false; |
} |
