Java Utililty Methods Text File Read by Charset

List of utility methods to do Text File Read by Charset

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Description

The list of methods to do Text File Read by Charset are organized into topic(s).

Method

StringreadFile(final InputStream is, final Charset encoding)
Reads a file. 
if (is == null) {
    throw new IllegalArgumentException("The InputStream is null");
if (encoding == null) {
    throw new IllegalArgumentException("The Charset is null");
final Reader reader = new BufferedReader(new InputStreamReader(is, encoding));
final StringBuilder builder = new StringBuilder();
...
StringreadFile(String path, Charset charset)
read File 
StringBuilder content = new StringBuilder();
List<String> allLines = Files.readAllLines(new File(path).toPath(), charset);
for (String someLine : allLines) {
    content.append(someLine);
    content.append(STR_NEWLINE);
return content.toString().replaceFirst(UTF8_BOM, STR_EMPTY);
StringreadFile(String path, Charset encoding)
Read a file from path and convert it into string. 
return new Scanner(new File(path), "UTF-8").useDelimiter("\\A").next();
StringreadFileAsString(String path, String charsetName)
This method reads the file as String and assumes that file contains information in specified encoding. 
ByteBuffer content = internalReadFileAsByteArray(path);
CharBuffer result = Charset.forName(charsetName).decode(content);
char[] charContent = null;
if (result.hasArray()) {
    charContent = result.array();
} else {
    charContent = new char[result.limit()];
    result.get(charContent);
...
StringreadFileContents(File file, Charset charset)
read File Contents 
BufferedReader br = null;
StringBuilder sb = null;
String line;
if (file != null && charset != null) {
    if (file.exists()) {
        try {
            sb = new StringBuilder();
            br = Files.newBufferedReader(Paths.get(file.getPath()), charset);
...
ListreadFileToLines(String inFile, String inCharset)
read File To Lines 
return inFile == null ? new ArrayList<>(0) : readFileToLines(new File(inFile), inCharset);
ListreadFileToList(String filePath, String charsetName)
read file to string list, a element of list is a line 
File file = new File(filePath);
List<String> fileContent = new ArrayList<String>();
if (file == null || !file.isFile()) {
    return null;
BufferedReader reader = null;
try {
    InputStreamReader is = new InputStreamReader(new FileInputStream(file), charsetName);
...
StringreadFileToString(String filename, Charset encoding)
read File To String 
return readStreamToString(new FileInputStream(filename), encoding);
StringreadFileToString(String path, Charset charset)
read File To String 
List<String> lines = Files.readAllLines(Paths.get(path), charset);
return join("", lines);
StringreadFromInputStream(InputStream stream, Charset charset)
read From Input Stream 
List<Byte> bytes = new LinkedList<>();
byte[] buffer = new byte[128];
int read;
while ((read = stream.read(buffer)) != -1) {
    for (int i = 0; i < read; i++) {
        bytes.add(buffer[i]);
int total = bytes.size();
buffer = new byte[total];
for (int i = 0; i < total; i++) {
    buffer[i] = bytes.remove(0);
if (charset == null) {
    return new String(buffer);
} else {
    return new String(buffer, charset);