将图片转换大小

工具类：

package com.util;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;  

import javax.imageio.ImageIO;  

public class ImageResizer {  

    /***
     * 功能 :调整图片大小 开发：wuyechun 2011-7-22
     * @param srcImgPath 原图片路径
     * @param distImgPath  转换大小后图片路径
     * @param width   转换后图片宽度
     * @param height  转换后图片高度
     */
    public static void resizeImage(String srcImgPath, String distImgPath,
            int width, int height) throws IOException {  

        File srcFile = new File(srcImgPath);
        Image srcImg = ImageIO.read(srcFile);
        BufferedImage buffImg = null;
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        buffImg.getGraphics().drawImage(
                srcImg.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0,
                0, null);  

        ImageIO.write(buffImg, "JPEG", new File(distImgPath));  

    }  

}  

调用：

 try {
                ImageResizer.resizeImage("原路径","修改后路径",300,300);  //宽、高
            } catch (IOException e) {
                System.out.println("图片转换出现异常！");
            }  

原文地址：https://www.cnblogs.com/dztHome/p/8360577.html