apache-comnons系列之commons-imaging1.0 学习笔记

概述

• Imaging
  
  • The primary application programming interface (API) to the Imaging library.
• ImageInfo
  
  • ImageInfo represents a collection of basic properties of an image, such as width, height, format, bit depth, etc.
• ImageFormat
  
  • ImageFormats
  • BMP/GIF…
• ImageParser
  
  • Provides the abstract base class for all image reading and writing utilities. ImageParser implementations are expected to extend this
  • class providing logic for identifying and processing data in their own specific format.
• BmpImageParser

测试

• org.apache.commons.imaging.ImagingTest
  
  • guessFormat
    
    • Attempts to determine the image format of a file based on its “magic numbers,” the first bytes of the data.
    • compareBytePair
    • MAGIC_NUMBERS_GIF = { 0x47, 0x49, };
  • getImageInfo(委托给具体类型图片解析器)
    
    • imageParser = getImageParser(byteSource);
    • imageInfo = imageParser.getImageInfo(byteSource, params);
  • getBufferedImage
    
    • Reads the first image from a byte array.
    • imageParser = getImageParser(byteSource);
    • imageParser = getImageParser(byteSource);
  • writeImage
    
    • Writes the content of a BufferedImage to an OutputStream using the specified image format. Specifications for storing the file (such as data compression,
    • color models, metadata tags, etc.) may be specified using an optional parameters map.
    • imageParser2.canAcceptType(format)
    • imageParser.writeImage(src, os, params);
• org.apache.commons.imaging.examples.SampleUsage
  
  • 样例代码