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Z11 Java Common
There is a newer version: 1.8
/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package z11;

import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.io.FileUtils;
import org.imgscalr.Scalr;
import org.imgscalr.Scalr.Mode;

/**
 *
 * @author vietduc
 */
public class I_mage {

    public static BufferedImage readImage(String filePath) throws IOException {
        return ImageIO.read(new File(filePath));
    }

    public static BufferedImage readImage(InputStream ins) throws IOException {
        return ImageIO.read(ins);
    }

    public static void writeImage(BufferedImage img, String filePath, String imageFormat) throws IOException {
        ImageIO.write(img, imageFormat, new File(filePath));
    }

    public static void writeImage(BufferedImage img, String filePath) throws IOException {
        ImageIO.write(img, "JPG", new File(filePath));
    }

    public static BufferedImage getScaledImage(BufferedImage image, int width, int height) throws IOException {
        return Scalr.resize(image, Mode.AUTOMATIC, width, height, Scalr.OP_ANTIALIAS);
    }

    public static BufferedImage getScaledSmallImage(BufferedImage image, int width, int height) throws IOException {
        if (image.getWidth() <= width && image.getHeight() <= height) {
            return image;
        }
        return getScaledImage(image, width, height);
    }
    
    public static BufferedImage cropImage(BufferedImage src, int width, int height) {
        BufferedImage dest = src.getSubimage(0, 0, width, height);
        return dest;
    }
    
    public static BufferedImage cropSquareType1(BufferedImage src) {
        try {
            int width = src.getWidth();
            int height = src.getHeight();
            if (width < height) {
                return src.getSubimage(0, (height - width) / 2, width, width);
            } else if (width > height) {
                return src.getSubimage((width - height) / 2, 0, height, height);
            } else {
                return src;
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    
    public static boolean base64ToImage(String base64, String filePath) {
        try {
            byte [] dearr = Base64.decodeBase64(base64);
            File file = new File(filePath);
            FileUtils.writeByteArrayToFile(file, dearr);
            return true;
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
    }
    
    
    public static BufferedImage base64ToImage(String base64) throws IOException {
        byte[] bytes = Base64.decodeBase64(base64);
        return bytesToImage(bytes);
    }
    
    
    public static BufferedImage bytesToImage(byte [] bytes) throws IOException {
        return ImageIO.read(new ByteArrayInputStream(bytes));
    }
    
    public static BufferedImage makeGrayScaleImage(BufferedImage colorImage) {
        BufferedImage image = new BufferedImage(colorImage.getWidth(), colorImage.getHeight(),
                BufferedImage.TYPE_BYTE_GRAY);
        Graphics g = image.getGraphics();
        g.drawImage(colorImage, 0, 0, null);
        g.dispose();
        return image;
    }
    
    public static void main(String[] args) throws IOException {
        /* test scale image
        BufferedImage img1 = ImageIO.read(new File("C:\\Users\\vietduc\\Desktop\\g1.jpg"));
        BufferedImage img2 = I_mage.getScaledImage(img1, 300, 200);
        File outputfile = new File("C:\\Users\\vietduc\\Desktop\\g2.jpg");
        ImageIO.write(img2, "JPG", outputfile);         
        */
        
        String image_path = "/Users/danny/Desktop/av_nam";
        String image_out = "/Users/danny/workspace/nb/http_service/toeic_campaign_api/img_avata_2";
        
        String[] files = F_ile.listFileInfolder(image_path);
        
        for (int i = 0; i < files.length; i++) {
            System.out.println("img: " + i + " - " + files[i]);
            BufferedImage img_in_i = ImageIO.read(new File(image_path + "/" + files[i])); 
            BufferedImage img_out_i = cropSquareType1(img_in_i);
            if (img_out_i != null) {
                ImageIO.write(img_out_i, "JPG", new File(image_out + "/avata_n_" + i + ".jpg"));
            }
        }
        
        
        
    }
    
    
}