图片压缩

古城微笑少年丶 2022-08-07 09:38 261阅读 0赞

\#废话不说直接上代码

import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.util.Iterator;
    
    import javax.imageio.IIOImage;
    import javax.imageio.ImageIO;
    import javax.imageio.ImageWriteParam;
    import javax.imageio.ImageWriter;
    import javax.imageio.metadata.IIOMetadata;
    import javax.imageio.stream.ImageOutputStream;
    
    import com.sun.image.codec.jpeg.JPEGCodec;
    import com.sun.image.codec.jpeg.JPEGEncodeParam;
    import com.sun.image.codec.jpeg.JPEGImageEncoder;
    
    /**
     * 图片压缩
     * 
     * @author KEVIN LUAN
     *
     */
    public class CompressImageUtils {
    
    	public static void main(String[] args) throws IOException {
    		String src = "/Users/kevin/Downloads/img_src.jpg";
    		scaleImage(src);
    		compress(src);
    
    	}
    
    	// # >0.75 high quality ,0.5 medium quality ,0.25 low quality
    	// QualityParam=0.95
    	private static float QUALITY = 0.9f;
    	/**
    	 * 在压缩后的图片名称价格质量标示
    	 */
    	private static String APPEND_QUALITY_NAME = "_9";
    
    	public static void compress(String src) throws IOException {
    		File outFile = new File(buildNewName(src));
    		BufferedImage bufferedImage = ImageIO.read(new File(src));
    		JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(bufferedImage);
    		jep.setQuality(QUALITY, false);
    		FileOutputStream out = new FileOutputStream(outFile); // 输出到文件流
    		JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out, jep);
    		encoder.encode(bufferedImage);
    		out.close();
    	}
    
    	public static void scaleImage(String srcFile) throws IOException {
    		File file = new File(srcFile);
    		BufferedImage src = ImageIO.read(file);
    		int width = src.getWidth();
    		int height = src.getHeight();
    		BufferedImage _image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    		_image.getGraphics().drawImage(src, 0, 0, width, height, null); // 绘制缩小后的图
    		Iterator<?> writers = ImageIO.getImageWritersBySuffix("jpg");
    		ImageWriter writer = (ImageWriter) writers.next();
    		ImageWriteParam param = writer.getDefaultWriteParam();
    		param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    		param.setCompressionQuality(QUALITY);
    		ImageOutputStream outStream = ImageIO.createImageOutputStream(new File(buildNewName(srcFile)));
    		writer.setOutput(outStream);
    		IIOImage iioImage = new IIOImage(src, null, (IIOMetadata) null);
    		writer.write((IIOMetadata) null, iioImage, param);
    		outStream.flush();
    		outStream.close();
    	}
    
    	private static String buildNewName(String src) {
    		if (src != null && src.indexOf(".") != -1) {
    			int index = src.lastIndexOf(".");
    			return src.substring(0, index) + APPEND_QUALITY_NAME + src.substring(index);
    		}
    		return src + APPEND_QUALITY_NAME;
    	}
    
    }