如何在Android中将文件转换为base64（如.pdf，.text）？

Question

如何将SD卡文件（.pdf，.text）转换为基本64字符串和字符串发送到服务器

Answer 1

您所要做的就是将文件读取为字节数组，然后使用Base64.encodeToString(byte[], int)将其转换为Base64字符串。

Answer 2

这种方法对我有用

String encodeFileToBase64Binary = encodeFileToBase64Binary(yourFile);    

private String encodeFileToBase64Binary(File yourFile) {
    int size = (int) yourFile.length();
    byte[] bytes = new byte[size];
    try {
        BufferedInputStream buf = new BufferedInputStream(new FileInputStream(yourFile));
        buf.read(bytes, 0, bytes.length);
        buf.close();
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    String encoded = Base64.encodeToString(bytes,Base64.NO_WRAP);
    return encoded;
}

Answer 3

试试这些代码

        File dir = Environment.getExternalStorageDirectory();
        File yourFile = new File(dir, "path/to/the/file/inside/the/sdcard.ext");
        String encodeFileToBase64Binary = encodeFileToBase64Binary(yourFile);

        private static String encodeFileToBase64Binary(File fileName) throws IOException {
              byte[] bytes = loadFile(fileName);
              byte[] encoded = Base64.encodeBase64(bytes);
              String encodedString = new String(encoded);
              return encodedString;
         }