package com.digitalcity.test;

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

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

public class ImgCutUtil {
	public void readUsingImageReader(String src, String dest)
			throws Exception {

		// 取得图片读入器
		Iterator readers = ImageIO.getImageReadersByFormatName("jpg");

		ImageReader reader = (ImageReader) readers.next();

		// 取得图片读入流
		InputStream source = new FileInputStream(src);

		ImageInputStream iis = ImageIO.createImageInputStream(source);

		reader.setInput(iis, true);

		// 图片参数
		ImageReadParam param = reader.getDefaultReadParam();
		InputStream inputStream = new FileInputStream(new File(src));  
		// 图片信息
		BufferedImage bufferedImage = ImageIO.read(inputStream); 
		// 100，200是左上起始位置，300就是取宽度为300的，就是从100开始取300宽，就是横向100~400，同理纵向200~350的区域就取高度150
//		 Rectangle rect = new Rectangle(100, 200, 300, 150);//
		Rectangle rect = new Rectangle(0, 100, bufferedImage.getWidth(), bufferedImage.getHeight()-200);
		param.setSourceRegion(rect);
		BufferedImage bi = reader.read(0, param);
		//write
		ImageIO.write(bi, "jpg", new File(dest));

	}

	public static void main(String[] args) throws Exception { // main方法测试用
		ImgCutUtil t = new ImgCutUtil();
		t.readUsingImageReader("D:\\22.jpg", "D:\\33.jpg");
	}
}