Reading Binary file

[anish555]

How to read binary file in Spring batch.
Or how to convert binary file to text

[ebu]

hi,
you can extend Reader and do something like this:

final public class BinaryReader extends Reader {
	private static final Log				logger		= LogFactory.getLog(BinaryReader.class);
	
	private final InputStream	is;

	public BinaryReader(InputStream is) {
		this.is = is;
	}
	
	private int num;

	@Override
	public int read(char[] cbuf, int off, int len) throws IOException {

		byte [] bbuf = new  byte[cbuf.length]; //TODO
		int bytesRead = is.read(bbuf, off, len);
	
		if (logger.isDebugEnabled()) {
			logger.debug("cbuf.length="+cbuf.length+" off="+off+" len="+len+"  bytesRead="+bytesRead);
		}
		for (int i = 0; i < bytesRead; i++) {
			cbuf[off + i] = (char) (((char) bbuf[off+i])&0x00FF);

			if (logger.isDebugEnabled()) {
				logger.debug(num+++": "+getHexString(new byte[] {(byte) (((cbuf[off + i]&0xFF00)>>8)), (byte) (cbuf[off + i]&0x00FF)}));
			}
		}
		return bytesRead;
	}

	@Override
	public void close() throws IOException {
		is.close();
	}
	
	private String getHexString(byte[] b)  {
		  String result = "";
		  for (int i=0; i < b.length; i++) {
		    result +=
		          Integer.toString( ( b[i] & 0xff ) + 0x100, 16).substring( 1 );
		  }
		  return result;
	}

The resutling Reader returns chars with first dummy byte (and chars are thus dummy as well). After parsing just cast chars to bytes.

Best regards, Eugene.