如何调整目录中的图像大小? [英] How to resize images in a directory?

问题描述

此代码尝试在名为imgs"的目录中调整图像大小.不幸的是，由于某种原因，当我取消对 listFiles(..) 循环的注释时 ImageIO.read(sourceImageFile) 将返回 null.然而，在循环外直接处理相同的文件 (res("imgs/foto_3.jpg")) 有效.很明显，这个循环阻止了文件被读取.解决方案?

This code attempts to resize images in a directory called "imgs". Unfortunately for some reason when I uncomment the listFiles(..) loop ImageIO.read(sourceImageFile) will return null. Yet processing the same file straightaway outside the loop (res("imgs/foto_3.jpg")) works. So apparently, this loop is preventing the files from being read. Solutions?

import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
import static org.imgscalr.Scalr.*;

public class App {

    public static void main(String[] args) throws IOException {
//        for (File sourceImageFile : new File("imgs").listFiles()) {
//            res("imgs/"+sourceImageFile.getName());
//        }
        res("imgs/foto_3.jpg");

    }

    public static void res(String arg) throws IOException {

        File sourceImageFile = new File(arg);
        BufferedImage img = ImageIO.read(sourceImageFile);

        BufferedImage thumbnail = resize(img, 500);

        thumbnail.createGraphics().drawImage(thumbnail, 0, 0, null);
        ImageIO.write(thumbnail, "jpg", new File("resized/" + sourceImageFile.getName()));
    }
}

要重现该问题，您可以下载 Maven 项目.>

To reproduce the problem you can download the Maven project.

推荐答案

我改变了 res 方法:

I've changed res method:

public static void res(File arg) throws IOException {
        if (arg.contains(".DS_Store")) {
            return;
        }

一个 mac 问题(或者应该过滤非图像文件，如建议的那样)！

A mac-issue (or should filter non-image files, as was suggested)!

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