Fileprocess - gsnaidujava/pp GitHub Wiki

private final static String NEWLINE = System.getProperty("line.separator");

public void removeDuplicateHeader(String inputFile, String outputPath)
		throws IOException {

Scanner scanner = new Scanner(new File(inputFile));
BufferedReader br = new BufferedReader(new FileReader(inputFile));
String header = scanner.nextLine();
String trailer = new String();
String trailerPart = new String();
String temp = null;
String tempHeaderPart = header.substring(0, 4);

// to find trailer
while ((temp = br.readLine()) != null) {
	trailer = temp;
}
// getting first 4 bytes of trailer
if (trailer.trim().length() > 0) {
	trailerPart = trailer.substring(0, 4);
}
// to buffer the PrintWriter's output to the file.
BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(
		outputPath + ".txt"));
// writing the header to the file.
bufferedWriter.write(header + NEWLINE);
StringBuilder strBuilder = new StringBuilder();
while (scanner.hasNextLine()) {

		String line = scanner.nextLine();
		String temp1 = line.substring(0, 4);
		try {
			if (tempHeaderPart.equals(temp1)) {
				scanner.nextLine();
			} else if (trailerPart.equals(temp1)) {
				scanner.nextLine();
			} else {
				strBuilder.append(line + NEWLINE);
			}
		} catch (Exception e) {
			break;
		}
	}
	bufferedWriter.write(strBuilder.toString());
	bufferedWriter.write(trailer);
	bufferedWriter.close();
}

public static void main(String ar[]) throws Exception {

FileProcess fileprocess = new FileProcess();

		fileprocess
				.removeDuplicateHeader(
						"C:\\Users\\F50RJZR\\Desktop\\temp\\GEN4_ICICI.GEN4_FILE.20140906_2.txt",
						"C:\\Users\\F50RJZR\\Desktop\\temp\\outputFile");
	}
}