Delete Row according to text in a Java Txt

Question

Delete Row according to text in a Java Txt

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#1 by (4 votes)

2

Good I have a code like this:

String ruta = "archivo.txt";
File archivo = new File(ruta);
String texto;
String[] a;
String pre= "texto a encontrar";
  FileReader f = new FileReader(archivo);
  FileWriter f1 = new FileWriter(archivo);
  BufferedReader b = new BufferedReader(f);
  PrintWriter out = new PrintWriter(new BufferedWriter(f1));
 while((texto = b.readLine())!=null) {
 a = texto.split("==");
       String h = a[0];    



       if (h.equals(pre)){
          out.println("");

           f1.close();
       }

What I want to get to do is, according to a text, be able to eliminate that row without having to delete or overwrite the entire file just the row where that text appears. Thanks and best regards

java archivo text

asked by zekamodz 11.05.2018 в 13:28

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1 answer

Problem when casting variables in Java (Android): NumberFormatException: For input string: "" Compare different ArrayList's in Java

score 4 · Accepted Answer

An easy way to modify the entire file by removing all the rows that do not contain a certain string:

public void eliminarFilas(String rutaAlFichero, String cadena) throws IOException{
    Path path = Paths.get(rutaAlFichero);
    List<String> lineas = Files.readAllLines(path);
    lineas = lineas.stream()
                    .filter(linea->!linea.contains(cadena))
                    .collect(Collectors.toList());
    Files.write(path, lineas);
}