1.MultipartFile, BufferedImage, File, Image, conversion
1)file --> MultipartFile
File file = new File("F:/test_used_url/ocr/originalPic/111.jpg");
FileInputStream in_file = new FileInputStream(file)
MultipartFile multi = new MockMultipartFile("1.jpg", in_file);
2)MultipartFile --> BufferedImage -->Image
InputStream in = picture.getInputStream();
BufferedImage bufferedImage = ImageIO.read(in);
Image image = bufferedImage.getScaledInstance(80, (int) (80 * ((float) (bufferedImage.getWidth() / bufferedImage.getHeight()))), Image.SCALE_SMOOTH);
3) Image --> BufferedImage
BufferedImage outputImage = new BufferedImage(80, (int) (80 * ((float) (bufferedImage.getWidth() / bufferedImage.getHeight()))), BufferedImage.TYPE_INT_RGB);
outputImage.getGraphics().drawImage(image, 0, 0, null);
2. Image Compression:
MultipartFile the BufferedImage output parameter type;
public static BufferedImage compressPic(MultipartFile picture) throws IOException {
InputStream in = picture.getInputStream();
BufferedImage bufferedImage = ImageIO.read(in);
Image image = bufferedImage.getScaledInstance(80, (int) (80 * ((float) (bufferedImage.getWidth() / bufferedImage.getHeight()))), Image.SCALE_SMOOTH);
BufferedImage outputImage = new BufferedImage(80, (int) (80 * ((float) (bufferedImage.getWidth() / bufferedImage.getHeight()))), BufferedImage.TYPE_INT_RGB);
outputImage.getGraphics().drawImage(image, 0, 0, null);
// ImageIO.write(outputImage, "jpg", new File("F:/test_used_url/ocr/originalPic/11111.jpg"));
return outputImage;
}
3.Base64 coding
public static String base64(MultipartFile pic_mpFile) throws IOException {
String baseStr = null;
InputStream in = pic_mpFile.getInputStream();// -->输入流
BufferedImage bi = ImageIO.read(in);// -->bufferedImage
ByteArrayOutputStream bo = new ByteArrayOutputStream();
ImageIO.write(bi, "jpg", bo);// 写入字节输出流
BASE64Encoder base64 = new BASE64Encoder();
baseStr = base64.encode(bo.toByteArray());// -->转base64编码
return baseStr;
}