package com.totzcc;

import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.io.File;
import java.io.FileOutputStream;

import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.plugins.jpeg.JPEGImageWriteParam;

public class Img {
    public static void main(String[] args) {
        if (compressPic("D:/1.jpg", "D:/2.jpg")) {
            System.out.println("压缩成功！");
        } else {
            System.out.println("压缩失败！");
        }
    }

    public static boolean compressPic(String srcFilePath, String descFilePath) {
        File file = null;
        BufferedImage src = null;
        FileOutputStream out = null;
        ImageWriter imgWrier;
        ImageWriteParam imgWriteParams;

        // 指定写图片的方式为 jpg
        imgWrier = ImageIO.getImageWritersByFormatName("jpg").next();
        imgWriteParams = new JPEGImageWriteParam(null);
        // 要使用压缩，必须指定压缩方式为MODE_EXPLICIT
        imgWriteParams.setCompressionMode(imgWriteParams.MODE_EXPLICIT);
        // 这里指定压缩的程度，参数qality是取值0~1范围内，
        imgWriteParams.setCompressionQuality((float) 0.8);
        imgWriteParams.setProgressiveMode(imgWriteParams.MODE_DISABLED);
        ColorModel colorModel = ColorModel.getRGBdefault();
        // 指定压缩时使用的色彩模式
        imgWriteParams.setDestinationType(
                new javax.imageio.ImageTypeSpecifier(colorModel, colorModel.createCompatibleSampleModel(16, 16)));

        try {
            if (srcFilePath == null || srcFilePath.trim().length() == 0) {
                return false;
            } else {
                file = new File(srcFilePath);
                src = ImageIO.read(file);
                out = new FileOutputStream(descFilePath);

                imgWrier.reset();
                // 必须先指定 out值，才能调用write方法, ImageOutputStream可以通过任何
                // OutputStream构造
                imgWrier.setOutput(ImageIO.createImageOutputStream(out));
                // 调用write方法，就可以向输入流写图片
                imgWrier.write(null, new IIOImage(src, null, null), imgWriteParams);
                out.flush();
                out.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }
}