Java圖片處理---尺寸不變,大小壓縮
阿新 • • 發佈:2019-01-23
尺寸不變,大小壓縮
public static boolean compressPic(String srcFilePath, String descFilePath) throws IOException {
File file = null;
BufferedImage src = null;
FileOutputStream out = null;
ImageWriter imgWrier;
ImageWriteParam imgWriteParams;
// 指定寫圖片的方式為 jpg
imgWrier = ImageIO.getImageWritersByFormatName("jpg" ).next();
imgWriteParams = new javax.imageio.plugins.jpeg.JPEGImageWriteParam(
null);
// 要使用壓縮,必須指定壓縮方式為MODE_EXPLICIT
imgWriteParams.setCompressionMode(imgWriteParams.MODE_EXPLICIT);
// 這裡指定壓縮的程度,引數qality是取值0~1範圍內,
imgWriteParams.setCompressionQuality((float )1);
imgWriteParams.setProgressiveMode(imgWriteParams.MODE_DISABLED);
ColorModel colorModel = ImageIO.read(new File(srcFilePath)).getColorModel();// ColorModel.getRGBdefault();
// 指定壓縮時使用的色彩模式
// 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();
// 必須先指定 out值,才能呼叫write方法, ImageOutputStream可以通過任何
// OutputStream構造
imgWrier.setOutput(ImageIO.createImageOutputStream(out));
// 呼叫write方法,就可以向輸入流寫圖片
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;
}