Code d’exemple lecture et écriture – Informatique 1

Le code ci-dessous reprend de manière synthétique ce qui a été présenté dans les slides. Lisez bien les commentaires car ils contiennent plusieurs informations pratiques qui pourront vous servir, notamment pour le laboratoire.

Code pour l’écriture

public static void main(String[] args) {
	try {
		// The first argument is the path where the written file will be
		// This is a absolute path for Windows. In Linux, something
		// like "~/out.txt" would write the file directly in you home directory 
		FileOutputStream fs = new FileOutputStream("c://temp//out.txt", true);
		PrintWriter pw = new PrintWriter(fs);
		
		// This is the content which will be written INTO the file
		pw.print("This is the text which will be written");
		
		// We have to close the file when we are done working with it
		pw.close();
	} catch (Exception e) {
		System.out.println("File can't be written");
		e.printStackTrace();
	}
	System.out.println("Writing done");
}

Code pour la lecture

public static void main(String args[]) {
	try {
		// The first argument is the path where the file will be read.
		// This is a absolute path for Windows. In Linux, something
		// like "~/out.txt" would read the file directly in you home directory
		FileReader f = new FileReader("c://temp//stuff.txt");
		BufferedReader bf = new BufferedReader(f);

		String line = "";

		// Each readLine() call CONSUMES the complete line
		line = bf.readLine();
		System.out.println("The first line of file is :" + line);
		line = bf.readLine();
		System.out.println("The second line of file is :" + line);
		bf.close();

	} catch (Exception e) {
		e.printStackTrace();
	}
}