Java Utililty Methods Path File Read nio

List of utility methods to do Path File Read nio

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Description

The list of methods to do Path File Read nio are organized into topic(s).

Method

StringreadFileToSingleString(String path)
Get the content of a text file as a single string. 
List<String> lns = new ArrayList<>();
try {
    lns = Files.readAllLines(new File(path).toPath());
} catch (IOException e) {
    e.printStackTrace();
StringBuilder sb = new StringBuilder();
for (String x : lns)
...
StringreadFileToString(@Nonnull Path file)
read File To String 
StringBuilder sb = new StringBuilder();
try (FileReader fr = new FileReader(file.toFile())) {
    int chr;
    while ((chr = fr.read()) != -1) {
        sb.append((char) chr);
return sb.toString();
...
byte[]readFromFile(Path absolutePath)
read From File 
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[8192];
int i;
try (FileInputStream fis = new FileInputStream(absolutePath.toString())) {
    while ((i = fis.read(buffer)) != -1) {
        baos.write(buffer, 0, i);
return baos.toByteArray();
StringreadFromFile(String path)
read From File 
File file = new File(path);
if (!file.exists())
    return "";
if (file.isDirectory())
    throwRuntimeException("file expected, this is a directory: " + path);
try {
    FileInputStream fin = new FileInputStream(file);
    return readFromStream(fin);
...
StringreadFromFile(String path)
read From File 
Preconditions.checkArgument(Files.exists(Paths.get(path)), "File '" + path + "' does not exist");
StringBuilder sb = new StringBuilder("");
try (BufferedReader reader = new BufferedReader(new FileReader(path))) {
    String line = reader.readLine();
    while (line != null) {
        line = line.trim();
        if (!"".equals(line)) {
            sb.append(line).append("\n");
...
byte[]readFully(Path filePath)
read Fully 
return readFully(new FileInputStream(filePath.toFile()));
int[]readIntsFromFile(String filePath)
Reads a file which has one integer value on each line, and returns the values in an integer array. 
try {
    Path path = Paths.get(filePath);
    List<Integer> values = new ArrayList<Integer>();
    BufferedReader reader = Files.newBufferedReader(path, Charset.defaultCharset());
    String line = reader.readLine();
    while (line != null) {
        Integer value = Integer.valueOf(line);
        values.add(value);
...
TreadJson(Class dataClass, Path path)
Reads the data from a JSON file at the given path 
if (path == null) {
    return null;
ObjectMapper jsonMapper = new ObjectMapper();
return jsonMapper.readValue(path.toFile(), dataClass);
TreadJsonObject(Path path, TypeReference typeReference)
read Json Object 
ObjectMapper mapper = new ObjectMapper();
return mapper.readValue(path.toFile(), typeReference);
MapreadKeyFile(String path)
read Key File 
Map<String, Integer> result = new HashMap<String, Integer>();
List<String> lines = readLinesOfFile(path);
for (int i = 0; i < lines.size(); i++) {
    String line = lines.get(i);
    if (line.startsWith(A_KEY)) {
        result.put(A_KEY, Integer.valueOf(line.split("=")[1]));
    } else if (line.startsWith(K_KEY)) {
        result.put(K_KEY, Integer.valueOf(line.split("=")[1]));
...