compress Picture - Java 2D Graphics

Java examples for 2D Graphics:Image Compress

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Description

compress Picture

Demo Code


//package com.java2s;
import javax.imageio.ImageIO;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;

import java.io.FileOutputStream;
import java.io.IOException;

public class Main {


    public static boolean compressPic(String inputFile, String outFile,
            int width, int height, boolean proportion) {
        try {//from w w  w.j av  a2  s.co  m
            // 
            File file = new File(inputFile);
            if (!file.exists()) {
                return false;
            }
            Image img = ImageIO.read(file);
            // ?
            if (img.getWidth(null) == -1) {
                return false;
            } else {
                int newWidth;
                int newHeight;
                // ?
                if (proportion == true) {
                    // ?
                    double rate1 = ((double) img.getWidth(null))
                            / (double) width + 0.1;
                    double rate2 = ((double) img.getHeight(null))
                            / (double) height + 0.1;
                    // 
                    double rate = rate1 > rate2 ? rate1 : rate2;
                    newWidth = (int) ((img.getWidth(null)) / rate);
                    newHeight = (int) ((img.getHeight(null)) / rate);
                } else {
                    newWidth = width; // ?
                    newHeight = height; // ?
                }

                // 
                /*
                 * if (img.getWidth(null) < width && img.getHeight(null) <
                 * height) { newWidth = img.getWidth(null); newHeight =
                 * img.getHeight(null); }
                 */
                BufferedImage tag = new BufferedImage(newWidth, newHeight,
                        BufferedImage.TYPE_INT_RGB);

                // Image.SCALE_SMOOTH ? ,?  
                tag.getGraphics().drawImage(
                        img.getScaledInstance(newWidth, newHeight,
                                Image.SCALE_SMOOTH), 0, 0, null);
                FileOutputStream out = new FileOutputStream(outFile);
                // JPEGImageEncoder?
                //JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); -yrh comment
                //encoder.encode(tag); -yrh comment
                out.close();
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        return true;
    }
}

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