Java Utililty Methods InputStreamReader Read

if (file == null) {
    return null;
StringBuilder sbData = new StringBuilder();
BufferedReader bufferedReader = null;
try {
    bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(file), "UTF-8"));
    String buffer;
...

StringBuffer contents = new StringBuffer();
try {
    FileInputStream fstream = new FileInputStream(file);
    DataInputStream in = new DataInputStream(fstream);
    BufferedReader br = new BufferedReader(new InputStreamReader(in));
    String line;
    while ((line = br.readLine()) != null) {
        contents.append(line);
...

BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
try {
    StringBuilder ret = new StringBuilder();
    String line;
    while ((line = reader.readLine()) != null) {
        ret.append(line);
        ret.append("\n");
    return ret.toString();
} finally {
    reader.close();

String fileStr = "";
String strLineCurrent = "";
try {
    FileInputStream fstream = new FileInputStream(file);
    DataInputStream in = new DataInputStream(fstream);
    BufferedReader br = new BufferedReader(new InputStreamReader(in));
    while ((strLineCurrent = br.readLine()) != null) {
        fileStr = fileStr + strLineCurrent + "\n";
...

final BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(file), "UTF-8"));
try {
    String tmp = in.readLine();
    final StringBuilder sb = new StringBuilder(tmp != null ? tmp : ""); 
    while ((tmp = in.readLine()) != null) {
        sb.append(System.getProperty("line.separator")); 
        sb.append(tmp);
    return sb.toString();
} finally {
    if (in != null) {
        in.close();

final char[] buffer = new char[BUFFER];
final StringBuilder out = new StringBuilder();
try (final Reader in = new InputStreamReader(new FileInputStream(file), "UTF-8")) {
    return readFromStream(buffer, out, in);

StringBuilder sb = new StringBuilder();
BufferedReader reader = null;
try {
    reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), ENCODING));
    String lineStr = null;
    while ((lineStr = reader.readLine()) != null) {
        sb.append(lineStr + "\n");
} finally {
    reader.close();
return sb.toString();

FileInputStream fileInputStream = new FileInputStream(file);
try {
    StringBuilder returnVal = new StringBuilder((int) file.length());
    BufferedInputStream in = new BufferedInputStream(fileInputStream);
    in.mark(3);
    Reader reader = new InputStreamReader(in, consumeBOM(in, default_encoding));
    char[] line = new char[2000];
    int count = 0;
...

long length = file.length();
if (length > Integer.MAX_VALUE) {
return readFile(new FileInputStream(file), file.getName(), encoding, length);

String fileContent = "";
try {
    if (file.isFile() && file.exists()) {
        InputStreamReader read = new InputStreamReader(new FileInputStream(file), encoding);
        BufferedReader reader = new BufferedReader(read);
        String line;
        while ((line = reader.readLine()) != null) {
            fileContent += line;
...