Saving result in txt file

Question

Guys how would I save the output from the program to txt file ? in the example I call cmd and ask you to accomplish something, wanted to save the result in a text file.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class test {

public static void main(String[] args) throws IOException {



    String line;
    Process saida;

    //executa o processo e armazena a referência em 'Saida'

    saida = Runtime.getRuntime().exec("cmd /c ipconfig");



    //pega o retorno do processo

    BufferedReader stdInput = new BufferedReader(new 
            InputStreamReader(saida.getInputStream()));

    //printa o retorno
    while ((line = stdInput.readLine()) != null) {
        System.out.println(line);

    }
    stdInput.close();

}
}

Answer 1

Here’s a very simple way, based on Docs.

---

Include these Imports:

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;

Create this path:

Path path = Paths.get("/endereco/do/seu/arquivo.txt");

And change your own System.out.println(line); for:

Files.write(path, line.getBytes(), StandardOpenOption.APPEND);

To create a file, instead of using an existing one, add right after the creation of path:

try {
    Files.createFile(path);
} catch (Exception e) {
    System.err.println(e);
}

Answer 2

I won’t have time to edit the code but I’ll explain how it works and you can adapt to your need.

In this case I created functions that create the txt file (which in this case I call wallet), and also has a function that verifies the existence of the same what you should do is call the check function, and if it does not exist you call the function that will create a.

    public boolean verifCarteira(String carteira) {
        File file = new File(carteira);

        return file.exists();

    }

    public boolean criaCarteira(String Carteira) throws IOException {
        new File(Carteira).createNewFile();
        File file = new File(Carteira);
        return file.exists();
    }
    
    public boolean verifRegistro(String registro) {
        File file = new File(registro + "registro.txt");

        return file.exists();

    }

    public void criaRegistro(String registro) throws IOException {
        new File(registro + "registro.txt").createNewFile();
        File file = new File(registro + "registro.txt");
        if(file.exists()){
            System.err.println("Registro criado");
        }
    }