java代码如何将png转换为jpeg图片呢?

png转jpeg

实现思路:
    1.将图片信息读入到BufferedImage对象中
	2.使用ImageIO.write将对象写入为一个新的后缀名文件即可

package com.java265;
 
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
 
public class ConvertImageFile {
 
   public static void main(String[] args) {
	BufferedImage bufferedImage;
		
	try {
	  //读取图片文件
	  bufferedImage = ImageIO.read(new File("D:\\test2.png"));
 
	  //创建一个空的RGB文件和原文件具有相同的尺寸(宽和高),白色背景
	  BufferedImage newBufferedImage = new BufferedImage(bufferedImage.getWidth(),
			bufferedImage.getHeight(), BufferedImage.TYPE_INT_RGB);
	  newBufferedImage.createGraphics().drawImage(bufferedImage, 0, 0, Color.WHITE, null);
 
	  // 写入为jpeg file
	  ImageIO.write(newBufferedImage, "jpg", new File("d:\\test3.jpg"));
	  System.out.println("转换完成");
	} catch (IOException e) { 
	  e.printStackTrace();
	}

   }
}