package com.image;

import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.FileImageOutputStream;
import javax.imageio.stream.ImageInputStream;

import org.junit.Test;

public class Main {
	@Test
	public void test() throws IOException {
		String srcPath = "c:/src.jpg";
		String dstPath = "c:/dst.jpg";
		Iterator readers = ImageIO.getImageReadersByFormatName("jpg");
		ImageReader reader = (ImageReader) readers.next();
		InputStream source = new FileInputStream(new File(srcPath));
		ImageInputStream input = ImageIO.createImageInputStream(source);
		reader.setInput(input, true);
		ImageReadParam param = reader.getDefaultReadParam();
		Rectangle rect = new Rectangle(60, 60, 100, 100);
		param.setSourceRegion(rect);
		BufferedImage bi = reader.read(0, param);
		ImageIO.write(bi, "jpg", new FileImageOutputStream(new File(dstPath)));

	}
}