ここに来て、コードを提醒します。Javaは写真の圧縮方法を実現します。

昼はちょっと用事があります。食事はちょっと遅いです。暇なまま、コードの断片を収集し続けます。

        /**
	 *       
	 * 
	 * @param oldFile
	 *                   
	 * @param width
	 *                      
	 * @param height
	 *                      
	 * @param uqualityality
	 *                  <b>   1.0</b>
	 * @param smallIcon
	 *                 ,      
	 */
	public static void imageZip(File oldFile, File destFile, String format,
			int maxWidth, int maxHeight, float uqualityality)
			throws IOException {
		FileOutputStream out = null;
		try {
			//       
			if (!oldFile.exists())
				return;
			/**                */
			Image srcFile = ImageIO.read(oldFile);
			int new_w = 0, new_h = 0;
			//             
			int h = (int) srcFile.getHeight(null);
			//             
			int w = (int) srcFile.getWidth(null);
			//                  
			if ((((double) w) > (double) maxWidth)
					|| (((double) h) > (double) maxHeight)) {
				//                  
				double rateW = ((double) srcFile.getWidth(null))
						/ (double) maxWidth * uqualityality;
				double rateH = ((double) srcFile.getHeight(null))
						/ (double) maxHeight * uqualityality;
				//               
				double rate;
				char zipType;
				if (rateW > rateH) {
					rate = rateW;
					zipType = 'W';
				} else {
					rate = rateH;
					zipType = 'H';
				}
				new_w = (int) (((double) srcFile.getWidth(null)) / rate);
				new_h = (int) (((double) srcFile.getHeight(null)) / rate);

				double rate2 = 0;
				if (zipType == 'W' && new_h > maxHeight) {
					rate = (double) new_h / (double) maxHeight * uqualityality;
				} else if (zipType == 'H' && new_w > maxWidth) {
					rate = (double) new_w / (double) maxWidth * uqualityality;
				}
				if (rate2 != 0) {
					new_w = (int) (((double) new_w) / rate);
					new_h = (int) (((double) new_h) / rate);
					System.out.println("2     。");
				}
			} else {
				new_w = w;
				new_h = h;
			}
			if (new_w < 1)
				throw new IllegalArgumentException("image width " + new_w
						+ " is out of range");
			if (new_h < 1)
				throw new IllegalArgumentException("image height " + new_h
						+ " is out of range");

			/**  ,    */
			BufferedImage tag = new BufferedImage(new_w, new_h,
					BufferedImage.TYPE_INT_RGB);
			tag.getGraphics().drawImage(srcFile, 0, 0, new_w, new_h, null);

			out = new FileOutputStream(destFile);
			JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
			JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);
			/**      */
			jep.setQuality(uqualityality, true);
			encoder.encode(tag, jep);
			out.close();
			srcFile.flush();
		} finally {
			if (out != null)
				out.close();
		}
	}

ユニットテスト：

     public static void main(String[] args) {
		File oldFile = new File("F:\\temp\\020130726140555MBV2.jpg");
		File destFile = new File("F:\\temp\\zipimages\\020130726140555MBV2.jpg");
		String format = "jpg";//    
		int maxWidth = 286;//  
		int maxHeight = 400;//  
		float uqualityality = (float) 0.5;//   
		try {
			imageZip(oldFile, destFile, format, maxWidth, maxHeight,
					uqualityality);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

本を読む時になって恨むことが少ない。紙のノートがなくなりました。ここで記録できます。もっと採取してください。