高分悬赏了，Java语言怎么将图片的分辨率提高一些，怎么把小图片还原成大图片，大图片找不到了

高分悬赏了，Java语言怎么将图片的分辨率提高一些，怎么把小图片还原成大图片，大图片找不到了

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import javax.imageio.ImageIO;

public class Temp01{

private Temp01(){

}

private void imageOp(InputStream inFile, String outFilePath, int width, int height){
    Image image = null;
    try {
        image = ImageIO.read(inFile);
    } catch (IOException e) {
        System.out.println("file path error...");
    }

    int originalImageWidth = image.getWidth(null);
    int originalImageHeight = image.getHeight(null);

    BufferedImage originalImage = new BufferedImage(
            originalImageWidth,
            originalImageHeight,
            BufferedImage.TYPE_3BYTE_BGR);
    Graphics2D g2d = originalImage.createGraphics();
    g2d.drawImage(image, 0, 0, null);

    BufferedImage changedImage =
        new BufferedImage(
                width,
                height,
                BufferedImage.TYPE_3BYTE_BGR);

    double widthBo = (double)width/originalImageWidth;
    double heightBo = (double)width/originalImageHeight;

    AffineTransform transform = new AffineTransform();
    transform.setToScale(widthBo, heightBo);

    AffineTransformOp ato = new AffineTransformOp(transform, null);
    ato.filter(originalImage, changedImage);

    File fo = new File(outFilePath); //将要转换出的小图文件 

    try {
        ImageIO.write(changedImage, "jpeg", fo);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

private void imageOp(String inFilePath, String outFilePath, int width, int height){
    File tempFile = new File(inFilePath);
    Image image = null;
    try {
        image = ImageIO.read(tempFile);
    } catch (IOException e) {
        System.out.println("file path error...");
    }

    int originalImageWidth = image.getWidth(null);
    int originalImageHeight = image.getHeight(null);

    BufferedImage originalImage = new BufferedImage(
            originalImageWidth,
            originalImageHeight,
            BufferedImage.TYPE_3BYTE_BGR);
    Graphics2D g2d = originalImage.createGraphics();
    g2d.drawImage(image, 0, 0, null);

    BufferedImage changedImage =
        new BufferedImage(
                width,
                height,
                BufferedImage.TYPE_3BYTE_BGR);

    double widthBo = (double)width/originalImageWidth;
    double heightBo = (double)width/originalImageHeight;

    AffineTransform transform = new AffineTransform();
    transform.setToScale(widthBo, heightBo);

    AffineTransformOp ato = new AffineTransformOp(transform, null);
    ato.filter(originalImage, changedImage);

    File fo = new File(outFilePath); //将要转换出的小图文件 

    try {
        ImageIO.write(changedImage, "jpeg", fo);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static void main(String[] args) throws FileNotFoundException {
    Temp01 t1 = new Temp01();
    t1.imageOp("C:/p02.jpg", "C:/p03.jpg", 400, 300);

    InputStream in = new FileInputStream(new File("C:/p02.jpg"));
    t1.imageOp(in, "C:/p04.jpg", 400, 300);

}

}

https://blog.csdn.net/chenweionline/article/details/2026855
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