将ByteArrayInputStream转换为文件而不保存到磁盘

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class ByteArrayInputStreamToFile {
    public static void main(String[] args) {
        // 创建一个示例的ByteArrayInputStream对象
        byte[] bytes = "Hello, World!".getBytes();
        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);

        // 创建一个空的文件对象
        File file = new File("output.txt");

        // 将ByteArrayInputStream转换为文件
        try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
             FileOutputStream fileOutputStream = new FileOutputStream(file)) {

            byte[] buffer = new byte[1024];
            int length;
            while ((length = byteArrayInputStream.read(buffer)) != -1) {
                byteArrayOutputStream.write(buffer, 0, length);
            }

            byte[] fileBytes = byteArrayOutputStream.toByteArray();
            fileOutputStream.write(fileBytes);

            System.out.println("ByteArrayInputStream已成功转换为文件。");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}