java批量压缩修改图片大小

1、不用任何jar包，直接上代码：

package com.mdr.shearImg;

import java.awt.Image;
import java.awt.image.*;
import java.io.*;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import javax.imageio.ImageIO;

import org.junit.jupiter.api.Test;

public class ShearImg {

	public static void main(String[] args) {
		//
		changeSize(60,60,"D:\\picc\\img");
	}

	/**
	 * 改变图片的尺寸
	 *
	 * @param newWidth,
	 *            newHeight, path
	 * @return boolean
	 */
	public static void changeSize(int newWidth, int newHeight, String path) {
		// 放一个目录过去，遍历里面的图片
		BufferedInputStream in = null;
		File[] files = new File(path).listFiles();
		for (int i = 0; i < files.length; i++) {
			if (files[i].getName().replaceAll("(.jpg|.png|.bmp|.gif)+", "").length() != files[i].getName().length()) {

				try {
					in = new BufferedInputStream(new FileInputStream(files[i]));

					// 字节流转图片对象
					Image bi = ImageIO.read(in);
					// 构建图片流
					BufferedImage tag = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB);
					// 绘制改变尺寸后的图
					tag.getGraphics().drawImage(bi, 0, 0, newWidth, newHeight, null);
					// 输出流
					BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(files[i]));
					ImageIO.write(tag, "PNG", out);
					in.close();
					out.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}

}

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