加载并显示文件夹中的所有图像 [英] Load and display all the images from a folder

问题描述

我想使用Java读取文件夹中的所有图像。

I want to read all the images in a folder using Java.

何时：我按下Java应用程序中的按钮，

它应该：

When: I press a button in the Java application,
It should:

• 在弹出窗口中询问目录的路径，


• 然后加载此目录中的所有图片，


• 然后显示其名称，维度类型和/尺寸。

• ask for the directory's path in a popup,
• then load all the images from this directory,
• then display their names, dimension types and size.

如何继续？

我有代码阅读图像以及文件夹中的所有图像，但我上面讲的内容是如何完成的？

I have the code for read the image and also for all image in the folder but how the things i told above can be done?

欢迎任何建议或帮助！请提供参考链接！

Any suggestion or help is welcome! Please provide reference links!

推荐答案

未经测试，因为没有安装JDK的机器，所以忍受我，那是所有输入按原样，但应该让你开始（预计会有大量的downvotes ......）

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import javax.imageio.ImageIO;

public class Test {

    // File representing the folder that you select using a FileChooser
    static final File dir = new File("PATH_TO_YOUR_DIRECTORY");

    // array of supported extensions (use a List if you prefer)
    static final String[] EXTENSIONS = new String[]{
        "gif", "png", "bmp" // and other formats you need
    };
    // filter to identify images based on their extensions
    static final FilenameFilter IMAGE_FILTER = new FilenameFilter() {

        @Override
        public boolean accept(final File dir, final String name) {
            for (final String ext : EXTENSIONS) {
                if (name.endsWith("." + ext)) {
                    return (true);
                }
            }
            return (false);
        }
    };

    public static void main(String[] args) {

        if (dir.isDirectory()) { // make sure it's a directory
            for (final File f : dir.listFiles(IMAGE_FILTER)) {
                BufferedImage img = null;

                try {
                    img = ImageIO.read(f);

                    // you probably want something more involved here
                    // to display in your UI
                    System.out.println("image: " + f.getName());
                    System.out.println(" width : " + img.getWidth());
                    System.out.println(" height: " + img.getHeight());
                    System.out.println(" size  : " + f.length());
                } catch (final IOException e) {
                    // handle errors here
                }
            }
        }
    }
}

使用的API

这样做和使用相对简单只有标准的JDK打包类：

APIs Used

This is relatively simple to do and uses only standard JDK-packaged classes:

• 文件


• FilenameFilter


• BufferedImage


• ImageIO

• File
• FilenameFilter
• BufferedImage
• ImageIO

Java教程也可以为您提供帮助：

These sessions of the Java Tutorial might help you as well:

• 阅读/加载图片


• 如何使用图标


• 如何使用文件选择器

• Reading/Loading an Image
• How to Use Icons
• How to Use File Choosers

• 使用Apache Commons FilenameUtils 提取文件的扩展名


• 根据实际的mime类型或内容检测文件，而不是基于扩展名


• 我将UI代码留给您。由于我不知道这是否是家庭作业，我不想提供完整的解决方案。但要继续：
  
  
  
  • 查看 FileChooser 以选择文件夹。
  
  
  • 我假设您已经知道如何制作框架/窗口/对话框。
  
  
  • 阅读 Java教程 如何使用图标部分，教您如何显示和标记他们。
  
  
  • Use Apache Commons FilenameUtils to extract files' extensions
  • Detect files based on actual mime-types or content, not based on extensions
  • I leave UI code up to you. As I'm unaware if this is homework or not, I don't want to provide a full solution. But to continue:
    • Look at a FileChooser to select the folder.
    • I assume you already know how to make frames/windows/dialogs.
    • Read the Java Tutorial How to Use Icons sections, which teaches you how to display and label them.
    
    
    • 异常处理
    
    
    • 带有邪恶忍耐的文件夹（假设你有一个文件夹TryMeIAmEvil.png）
    
    

    综合以上所有内容，这很容易做到。

    By combining all of the above, it's pretty easy to do.

    这篇关于加载并显示文件夹中的所有图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！