CODEWITHSUNDEEP
javaarraysbytetostring
Albert
Albert

Reputation: 21

How to convert byte array to string for all file types

Currently the I can get the data from the database which will be in BLOB datatype. So in code it will be stored in the byte []. For now I can convert the byte array to string by mentioning the character set (eg.UTF-8) as below:

public byte[] mtdFileEncryption(byte[] myData,String fileName) throws DNSException, Exception
{
    String strLocalFolder = SysProperties.getprocessFile_LOCAL_FOLDER();
    String strOnlineSSTPublicKey = SysProperties.getOnline_SST_ENCRYPTION_PUBLIC_KEY();
    String strFilename = fileName;
    PGPFileEncryptor fileEncryptor = new com.test.PGPFileEncryptor();

    File outputFile = null;
    FileOutputStream fos = null;
    OutputStreamWriter osw = null;
    BufferedWriter bufferOutput = null;

    File toFile = new File(strLocalFolder);
    if(!toFile.isDirectory())
    {
    //Create temp folder
    toFile.mkdir();
    }

    try
    {
        //generate file to local folder
        //outputFile = new File(strLocalFolder + strFilename + ".txt");

        outputFile = new File(strLocalFolder + strFilename);
        fos = new FileOutputStream(outputFile);
        osw = new OutputStreamWriter(fos);
        bufferOutput = new BufferedWriter(osw);
        //WORKING FOR TXT
        String str = new String(myData, "UTF-8");
        bufferOutput.write(str);

    }catch(Exception e)
    {
        e.printStackTrace();
        throw e;
    }finally
    {
        if(bufferOutput != null)
        {
            bufferOutput.close();
            bufferOutput = null;
        }

        if (osw != null)
        {
            osw.close();
            osw = null;
        }

        if (fos != null)
        {
            fos.close();
            fos = null;
        }
    }

Which means the following can be converted to string and I can view the content of the .txt stored file 

//WORKING FOR TXT
        String str = new String(myData, "UTF-8");
        bufferOutput.write(str);

But this does not happen for other file , .pdf or .xls I was not able to view the content. Can I know how to convert the byte array(myData) to string for all file types (.pdf,.xls,etc) without specifying the character set ?

The following are how the byte array[] passed into the method. The file_content is the BLOB Datatype from table.

    String contentString = rsStatementRequest.getValue("file_content");
                    BASE64Decoder en = new BASE64Decoder();
                    byte[] contentBytes = en.decodeBuffer(contentString);
contentBytes = mtdFileEncryption(contentBytes,fileName);

Upvotes: 0

Views: 1959

Answers (1)

Peter Lawrey
Peter Lawrey

Reputation: 533710

I suggest writing the byte[] BLOB in binary. Writing is as text is likely to corrupt it esp if it is encrypted.

public void mtdFileEncryption(byte[] myData,String fileName) throws IOException {
    String strLocalFolder = SysProperties.getprocessFile_LOCAL_FOLDER();
    new File(strLocalFolder).mkdir();

    try (FileOutputStream fos = new FileOutputStream(new File(strLocalFolder, fileName)) {
         fos.write(myData);
    }
}

Upvotes: 2

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