Android到Base64的转换不起作用

Question

我正在尝试上传一个文件PDF文件到服务器。为此，我需要将PDF文件转换为BASE64字符串。

转换正在进行，但当我尝试将Base64转换为PDF时，它并没有给出适当的值。我的错误就像下面的图片一样。

文件选择代码

@SuppressLint("NewApi")
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult( requestCode, resultCode, data );

    if (requestCode == PDF_REQ_CODE && resultCode == RESULT_OK && data != null && data.getData() != null) {
        uri = data.getData();
        //String path=data.getData().getPath();
        btnPdfFileChooser.setText( "PDF is Selected" );
        //Toast.makeText(FileUploadActivity.this, uri.toString(), Toast.LENGTH_SHORT).show();
        //InputStream inputStream = c.getContentResolver().openInputStream(path)
        PdfUploadFunction();
    }
}

上传功能(需要编写API调用来更新服务器中的详细信息。)。

private void PdfUploadFunction() {
    // Getting pdf name from EditText.
    PdfNameHolder = strPdfFileName.toString().trim();
    // Getting file path using Filepath class.
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        PdfPathHolder = FilePath.getPath( this, uri );
    }
    // If file path object is null then showing toast message to move file into internal storage.
    if (PdfPathHolder == null) {
        Toast.makeText( this, "Please move your PDF file to internal storage & try again.", Toast.LENGTH_LONG ).show();
    }
    // If file path is not null then PDF uploading file process will starts.
    else {
        String base64 = getBase64FromPath( PdfPathHolder );
        //String base64 = encodeFileToBase64Binary( PdfPathHolder );
        Toast.makeText( this, "base64-" + base64, Toast.LENGTH_LONG ).show();
        Log.e( "base64-", base64.toString() );
    }
}

BASE64转换代码.

 public static String getBase64FromPath(String path) {
      
        byte[] byteArray = null;
        try {
            File file = new File( path );
            InputStream inputStream = new FileInputStream(file);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            byte[] b = new byte[1024 * 11];
            int bytesRead = 0;

            while ((bytesRead = inputStream.read(b)) != -1) {
                bos.write(b, 0, bytesRead);
            }

            byteArray = bos.toByteArray();

            Log.e("Byte array", ">" + byteArray);

        } catch (IOException e) {
            e.printStackTrace();
        }
        return Base64.encodeToString(byteArray, Base64.NO_WRAP);
    }

我经常在谷歌上搜索。但我无法找到正确的解决办法。希望有人能帮忙。

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Answer 1

public static String getBase64Pdf(String pdfFilePath){
try{
    InputStream inputStream = new FileInputStream(pdfFilePath);
    byte[] byteArray = IOUtils.toByteArray(inputStream);
    String encodedPdfString = Base64.encodeToString(byteArray, Base64.DEFAULT);
    PrintLog.showTag(TAG,"pdf converted to string : " + encodedPdfString);
    return encodedPdfString;
}catch (IOException e){
}
return "";

不确定您的场景，但是在我的例子中，这是可行的，也许您的端

有一个路径问题。