How can I retrieve all files in a folder using Java?

To access all files in a folder, you can use the File class in Java. Here is a simple example code:

import java.io.File;

public class GetAllFilesInFolder {
    public static void main(String[] args) {
        // 指定要获取文件的文件夹路径
        String folderPath = "C:\\path\\to\\folder";

        // 创建一个File对象，表示文件夹
        File folder = new File(folderPath);

        // 获取文件夹下的所有文件
        File[] files = folder.listFiles();

        // 遍历文件数组，输出文件名
        if (files != null) {
            for (File file : files) {
                if (file.isFile()) {
                    System.out.println(file.getName());
                }
            }
        }
    }
}

In this example, we start by specifying a folder path and creating a File object to represent that folder. Then, we use the listFiles() method to retrieve all files in the folder, returning an array of files. Finally, we use a simple loop to iterate through the file array and check if each file is a file (not a folder), then output the file name.

Please note that the listFiles() method only returns the immediate files and folders in a directory, without recursively retrieving files from subfolders. If you need to recursively retrieve all files, you can use a recursive method or other library functions to achieve this.