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

问题描述

这段代码试图在名为imgs的目录中调整图像大小。不幸的是，当我取消注释listFiles（..）循环 ImageIO.read（sourceImageFile）将返回null。然而，在循环之外直接处理相同的文件（ res（imgs / foto_3.jpg））的作品。显然，这个循环阻止了文件的读取。解决方案？

  import java.awt.image。*; 
 import java.io. *; 
 import javax.imageio。*; 
 import static org.imgscalr.Scalr。*; 
 
 public class App {
 
 public static void main（String [] args）抛出IOException {
 // for（File sourceImageFile：new File（imgs ）.listFiles（））{
 // res（imgs /+ sourceImageFile.getName（））; 
 //} 
 res（imgs / foto_3.jpg）; 
 
 
 $ b public static void res（String arg）throws IOException {
 
文件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（）））; 
 
 
 
 
 
  
 
 
要重现这个问题，您可以下载Maven项目。 
 
解决方案
我已经改变了res方法：
 
 pre preublic static void void（File arg）throws IOException {
 if（arg.contains（。DS_Store））{
 return; 
 
 
 
 $ b一个mac问题（或者应该按照建议过滤非图像文件）！ 
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()));
    }
}


To reproduce the problem you can download the Maven project.
解决方案
I've changed res method:
public static void res(File arg) throws IOException {
        if (arg.contains(".DS_Store")) {
            return;
        }
A mac-issue (or should filter non-image files, as was suggested)!

                        
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