Java Utililty Methods Text File Read All

try (InputStream in = new FileInputStream(file)) {
    byte[] bs = new byte[(int) file.length()];
    int p = 0, len;
    while ((len = in.read(bs, p, bs.length - p)) >= 0)
        p += len;
    if (p != bs.length)
        throw new RuntimeException();
    return new String(bs);
...

StringBuilder builder = new StringBuilder();
FileInputStream intput = new FileInputStream(file);
Scanner scanner = new Scanner(intput, "UTF-8");
while (scanner.hasNextLine()) {
    builder.append(scanner.nextLine());
    builder.append("\n");
scanner.close();
...

if (Strings.isNullOrEmpty(path)) {
    throw new IOException(new IllegalArgumentException("The reading file is not defined."));
return readRange(path, 0, new File(path).length());

try {
    FileInputStream i = new FileInputStream(file);
    byte[] r = new byte[(int) file.length()];
    i.read(r);
    return new String(r);
} catch (Exception e) {
    return null;

InputStream is = new FileInputStream(fileName);
try {
    int n = is.available();
    byte[] data = new byte[n];
    is.read(data);
    return data;
} finally {
    is.close();
...

FileInputStream fis = null;
try {
    File file = new File(filename.toString());
    fis = new FileInputStream(file);
    int size = fis.available();
    byte[] contents = new byte[size];
    fis.read(contents);
    return new String(contents);
...