Java Utililty Methods Scanner Read

List of utility methods to do Scanner Read

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Description

The list of methods to do Scanner Read are organized into topic(s).

Method

StringreadFile(File file)
read File 
StringBuilder fileContents = new StringBuilder();
Scanner scanner;
try {
    scanner = new Scanner(file, "UTF-8");
} catch (FileNotFoundException e) {
    e.printStackTrace();
    return null;
String lineSeparator = System.getProperty("line.separator");
try {
    while (scanner.hasNextLine()) {
        fileContents.append(scanner.nextLine() + lineSeparator);
    return fileContents.toString();
} finally {
    scanner.close();
StringreadFile(File file)
read File 
Scanner scan;
try {
    scan = new Scanner(file);
} catch (FileNotFoundException e1) {
    e1.printStackTrace();
    return null;
String content = scan.useDelimiter("\\Z").next();
...
StringreadFile(File input)
Reads a file and outputs it as String 
StringBuilder fileBuffer = new StringBuilder((int) input.length());
Scanner scanner = new Scanner(input);
try {
    while (scanner.hasNextLine()) {
        fileBuffer.append(scanner.nextLine()).append('\n');
} finally {
    scanner.close();
...
StringreadFile(File path)
read File 
try {
    return new Scanner(path, "UTF-8").useDelimiter("\\A").next();
} catch (FileNotFoundException ex) {
    return null;
StringreadFile(final File f)
read File 
String s = null;
if (f.exists()) {
    s = new Scanner(f).useDelimiter("\\A").next();
return s;
ArrayListreadFile(String file_name)
read File 
ArrayList<String> list = null;
Scanner scanner;
try {
    list = new ArrayList<String>();
    scanner = new Scanner(new FileInputStream(file_name));
    while (scanner.hasNext()) {
        list.add(scanner.nextLine());
    scanner.close();
} catch (FileNotFoundException ex) {
    return null;
return list;
StringreadFile(String filename)
Reads a certain file of a path. 
StringBuilder content = new StringBuilder();
try {
    String NL = System.getProperty("line.separator");
    Scanner scanner = new Scanner(new FileInputStream(filename));
    try {
        while (scanner.hasNextLine()) {
            content.append(scanner.nextLine() + NL);
    } finally {
        scanner.close();
} catch (FileNotFoundException e) {
    e.printStackTrace();
return content.toString();
ListreadFile(String fileName)
read File 
Scanner s = new Scanner(new File(fileName));
List<String> list = new ArrayList<String>();
while (s.hasNext()) {
    list.add(s.next());
s.close();
return list;
StringreadFile(String fileName)
read File 
return new Scanner(new File(fileName)).useDelimiter("\\A").next();
StringreadFile(String fileName)
Reads a file relative to the CMPUT391 directory and returns a String. 
File inFile = new File("catalina/webapps/CMPUT391F/" + fileName);
String out = "";
Scanner scanner = new Scanner(new FileInputStream(inFile));
out = scanner.useDelimiter("\\Z").next();
return out;