Question

我有一个Microsoft Word文件的压缩base64字符串。如何将这个压缩的base64字符串转换为java中的原始文件。

我已尝试过此代码，但无法成功。这是我正在尝试的代码

public static void main(String[] args) throws IOException, DataFormatException {

    File file = new File(outputFileName);

    byte[] zipData = Base64.decodeBase64(compressed_base64_string);
    GZIPInputStream zi = new GZIPInputStream(new ByteArrayInputStream(zipData));
    String result = IOUtils.toString(zi);
    zi.close();


    InputStream filedata = new ByteArrayInputStream(result.getBytes("UTF-8"));
    byte[] buff = new byte[1024];

    FileOutputStream fos = new FileOutputStream(file);
    while (filedata.read(buff) > 0) {
          fos.write(buff);
    }
    fos.close();
}

此代码生成一个zip文件，其中有一些xml文件。但 compressed_base64_string 是从Microsoft Word文档生成的。我无法从此代码中获取原始文档。请告诉我接下来要做什么才能获得原始文件

Answer 1

以下代码对我有用

public static void main(String[] args) throws IOException, DataFormatException {
    String outputFilePath = "document.docx";
    File file = new File(outputFilePath);
    FileOutputStream fos = new FileOutputStream(file);
    byte[] zipData = Base64.decodeBase64(compressed_base64_string);
    GZIPInputStream zi = new GZIPInputStream(new ByteArrayInputStream(zipData));
    IOUtils.copy(zi, fos);

    fos.close();
    zi.close();

}

Answer 2

public static boolean decode(String filename) {
    try {
        byte[] decodedBytes = Base64.decode(loadFileAsBytesArray(filename), Base64.DEFAULT);
        writeByteArraysToFile(filename, decodedBytes);
        return true;
    } catch (Exception ex) {
        return false;
    }
}

public static boolean encode(String filename) {
    try {
        byte[] encodedBytes = Base64.encode(loadFileAsBytesArray(filename), Base64.DEFAULT);
        writeByteArraysToFile(filename, encodedBytes);
        return true;
    } catch (Exception ex) {
        return false;
    }
}

public static void writeByteArraysToFile(String fileName, byte[] content) throws IOException {
    File file = new File(fileName);
    BufferedOutputStream writer = new BufferedOutputStream(new FileOutputStream(file));
    writer.write(content);
    writer.flush();
    writer.close();
}

public static byte[] loadFileAsBytesArray(String fileName) throws Exception {
    File file = new File(fileName);
    int length = (int) file.length();
    BufferedInputStream reader = new BufferedInputStream(new FileInputStream(file));
    byte[] bytes = new byte[length];
    reader.read(bytes, 0, length);
    reader.close();
    return bytes;
}

编码（ “路径/到/文件”）;
解码（ “路径/到/文件”）;

将压缩的Base64字符串转换为其原始文件

2 个答案: