pour modifier une ligne dans un fichier texte à l'aide de programme java

Venez de créer pour vous un exemple

public static void main(String args[]) {
try {
//Open the file that is the first
//command line parameter
FileInputStream fstream = new FileInputStream("d:/new6.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
String strLine;
StringBuilder fileContent = new StringBuilder();
//Read File Line By Line
while ((strLine = br.readLine()) != null) {
//Print the content on the console
System.out.println(strLine);
String tokens[] = strLine.split(" ");
if (tokens.length > 0) {
//Here tokens[0] will have value of ID
if (tokens[0].equals("2")) {
tokens[1] = "betty-updated";
tokens[2] = "499";
String newLine = tokens[0] + " " + tokens[1] + " " + tokens[2] + " " + tokens[3];
fileContent.append(newLine);
fileContent.append("\n");
} else {
//update content as it is
fileContent.append(strLine);
fileContent.append("\n");
}
}
}
//Now fileContent will have updated content , which you can override into file
FileWriter fstreamWrite = new FileWriter("d:/new6.txt");
BufferedWriter out = new BufferedWriter(fstreamWrite);
out.write(fileContent.toString());
out.close();
//Close the input stream
in.close();
} catch (Exception e) {//Catch exception if any
System.err.println("Error: " + e.getMessage());
}
}

OriginalL'auteur Rahul Agrawal