从服务器流式传输文件时，磁盘上的文件大小大于读取的总字节数，这是怎么回事？

Question

我正在从 artifactory 读取一个二进制文件。根据 artifactory 的文件大小为 34,952,058 字节，读取完成后记录的 totalBytes 计数器也是 34,952,058 字节。但是磁盘上的文件大小是 39,426,048 字节。这是怎么回事？？我试过 BufferedOutputStream、FileOutputStream 和 OutputStream。每次都是相同的结果。我错过了什么？
这是我最新的代码目前的样子：

try {
                URL url = new URL(fw.getArtifactoryUrl());
                URLConnection connection = url.openConnection();
                in = connection.getInputStream();
                File folder = utils.getFirmwareFolder(null, FirmwareUtils.FIRMWARE_LATEST, true);
                StringBuilder builder = new StringBuilder(folder.toString());
                builder.append("/").append(fw.getFileName());
                Path filePath = Paths.get(builder.toString());
                OutputStream out = Files.newOutputStream(filePath);

                int read = 0;
                int totalBytes = 0;

                while ((read = in.read(bytes)) > 0) {
                    totalBytes += read;
                    out.write(bytes);
                    out.flush();
                }
                logger.info("Total bytes read: " + totalBytes);
                in.close();
                out.close();

<<< more code >>>

Answer 1

您的代码读取正确，但写入错误

while ((read = in.read(bytes)) > 0) { // Read amount of bytes
    totalBytes += read;  // Add the correct amount of bytes read to total
    out.write(bytes);    // Write the whole array, no matter how much we read
    out.flush();         // Completely unnecessary, can harm performance
}

您需要out.write(bytes, 0, read)只写入您读取的字节而不是整个缓冲区。

从服务器流式传输文件时，磁盘上的文件大小大于读取的总字节数，这是怎么回事？

When streaming a file from a server, the file size on disk is bigger than the total bytes read, what's going on?

java

file-io

inputstream

outputstream

fileoutputstream