Java Programming

Hi All
I have an application wherin i select multiple files and send them over to a webservice method.The files selected are zipped internally and sent across as a single entity.
I could pass the files and retrieve them using my test tool to check thir successful send and retrieval as long as the files were in "text" format.
But now i need to figure a way out to pass word docs or any other content types.I tried passing word docs in the mechanism that works fine for "text" files.But when i retrieve the files,and try to open the word documents the MS Word states that "the file is corrupt and cannot be opened". The following is the code.

public byte[] getContent(IDfSessionManager sessionManager,String repositoryName, String objectIdString) {

   ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
   StringBuffer sb = new StringBuffer("");
    try {
          System.out.println("Repository Name " + repositoryName);
           mySession = sessionManager.getSession(repositoryName);
           // Get the object ID based on the object ID string.
            DfId dfId = new DfId(objectIdString);
             if (dfId.isObjectId()) 
              {
	System.out.println("Successfully fetched id " + dfId);
	}

          IDfSysObject sysObj = (IDfSysObject) mySession.getObject(dfId);
          System.out.println("Content Type ++++++ " + sysObj.getContentType());
          ByteArrayInputStream buf = sysObj.getContent();
          int i = 0;
         InputStreamReader readInput = new InputStreamReader(buf, "UTF8");
         BufferedReader br = new BufferedReader(readInput);
         while (br.ready()) {
        sb.append(br.readLine());
         sb.append("\n");
                          }
          String captureText = sb.toString();
	try {
	is = new ByteArrayInputStream(captureText.getBytes("UTF-8"));
                	} catch (UnsupportedEncodingException e) {
                                e.printStackTrace();
			}

	final int BUF_SIZE = 1 << 8; // 1KiB buffer
	byte[] buffer = new byte[BUF_SIZE];
                int bytesRead = -1;
                 while ((bytesRead = is.read(buffer)) > -1) {
	outputStream.write(buffer, 0, bytesRead);
	}
	is.close();
	System.out.println("This is byte acquisition ###### >>>>>>>>>>>>>>>>>>>");
	binaryData = outputStream.toByteArray();
			
	File temp1 = File.createTempFile("Test",".docx");
	FileOutputStream fos = new FileOutputStream(temp1);
	fos.write(binaryData);
	fos.close();
	}
		// Handle any exceptions.
		catch (Exception ex) {
		ex.printStackTrace();

		}
		finally {
			sessionManager.release(mySession);
		}
		return binaryData;
	}

I assume that UTF8 must be applicatbe only to deal with .txt files.
I would really appreciate your guidance to obtain a way to acquire data from word documents so that i could open and read them without errors.

Thank You
Regards