Thread: Re: Reading a file line by line using the Scanner class

Hello,

I've tried so, but misses 1st line. The command "readNextLine" reads the next (the second) line. Can you confirm?

Greetings
JIB

Here is my code. Please have a look to the code-line after "//here is the problem ..."

	private Path filteredFile() {
		List<LEVImportFileDto> checkDtoList = new ArrayList<LEVImportFileDto>();
		LEVImportFileDto insFileDto = new LEVImportFileDto();
		String filtFile = importPath + "\\Documents\\LEV\\toImport.txt";
		filtFile = filtFile.replaceAll("\\\\", "/");
		Path inPath;
		Path outPath;
		inPath = Paths.get(URI.create("file:/" + filetoload));
		outPath = Paths.get(URI.create("file:/" + filtFile));
 
		InputStream inStream = null;
		Scanner scIn = null;
		BufferedWriter writer = null;
 
		try {
			inStream = Files.newInputStream(inPath, READ);
			scIn = new Scanner(inStream, iso.name());
			writer = Files.newBufferedWriter(outPath, utf8, WRITE, CREATE);
 
			while (scIn.hasNextLine()) {
				String[] line;
				String header;
				header = scIn.nextLine();
				line = header.split("#");
 
				// Überschrift fliegt raus
				// Ausschlusskriterien prüfen, ggf. springen
				if (line[12].matches("[0][123]") == false) {
					continue;
				}
				if (line[5].equals("000000000")){
					continue;
				}
 
				// dto füllen
				insFileDto = fillFileDto(line, false);
 
				// ... prüfen
				int y = 0;
				for (LEVImportFileDto xDto : checkDtoList) {
					if (xDto.equals(insFileDto)) {
						y += 1;
						break;
					}
				}
				// ... ggf. ausschließen
				if (y > 0) {
					continue;
				} else {
					// Dto der Liste hinzufügen
					checkDtoList.add(insFileDto);
 
//here is the problem: the first line to be written is the second line of the file
					// und Zeile schreiben
					writer.write(header);
//
					writer.newLine();
				}
			}
 
			writer.close();
 
			// spezielle Exception des Scanners prüfen
			if (scIn.ioException() != null) {
				scIn.ioException().printStackTrace();
			}
		} catch (Exception e) {
			String datumzeit = DatumUtil.formatiereDateTime(new Date());
			content = Arrays.asList(datumzeit + " - ERROR: " + e.getMessage()
					+ ", Typ " + e.getClass().getTypeName());
			try {
				writeProtocol(content, false);
			} catch (IOException e1) {
			}
 
			e.printStackTrace();
 
		} finally {
			scIn.close();
		}
 
		return outPath;
	}

The first line of the input-file would not be written in the output-file. Why can I get the 1st line from file?

Thanks.
JIB

___
My English is like me - very bavarian

This code reads the file line by line.
public static void readFileByLine(String fileName) {
try {
File file = new File(fileName);
Scanner scanner = new Scanner(file);
while (scanner.hasNext()) {
System.out.println(scanner.next());
}
scanner.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}

You can also set a delimiter as a line separator and then perform the same.
scanner.useDelimiter(System.getProperty("line.sepa rator"));

You have to check whether there is a next token available and then read the next token. You will also need to doublecheck the input given to the Scanner. i.e. dico.txt. By default, Scanner breaks its input based on whitespace. Please ensure that the input has the delimiters in right place