Java Utililty Methods File to String

try {
    File fileDir = new File(file);
    BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(fileDir), "UTF8"));
    String str, strOut = "";
    while ((str = in.readLine()) != null) {
        str = str.replace("\uFEFF", "");
        strOut += str + "\r\n";
    in.close();
    return strOut;
catch (Exception e) {
    return "";

String contents = "";
File f = null;
try {
    f = new File(file);
    if (f.exists()) {
        FileReader fr = null;
        try {
            fr = new FileReader(f);
...

FileInputStream fis = new FileInputStream(file);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[10240];
int len = fis.read(buffer, 0, buffer.length);
while (len > 0) {
    baos.write(buffer, 0, len);
    len = fis.read(buffer, 0, buffer.length);
fis.close();
return baos.toString(encoding);

FileInputStream fis = new FileInputStream(file_name);
return InputStreamToString(fis);

StringBuffer sb = new StringBuffer();
BufferedReader in = new BufferedReader(new FileReader(filename));
String str;
while ((str = in.readLine()) != null)
    sb.append(str);
in.close();
return sb.toString();

String result = null;
DataInputStream in = null;
try {
    byte[] buffer = new byte[(int) new File(filename).length()];
    in = new DataInputStream(new FileInputStream(filename));
    in.readFully(buffer);
    result = new String(buffer);
    in.close();
...

StringBuffer stringBuffer = new StringBuffer();
try {
    char[] buffer = new char[1024];
    FileReader reader = new FileReader(fileName);
    int flag = -1;
    while ((flag = reader.read(buffer, 0, buffer.length)) != -1) {
        stringBuffer.append(buffer, 0, flag);
} catch (FileNotFoundException e) {
    throw new IllegalArgumentException("[" + fileName + "] is not found.");
} catch (IOException e) {
    throw new RuntimeException("Unexpected exception! caused by: " + e.getMessage(), e);
return stringBuffer.toString();

System.gc();
File file = new File(fileName);
FileInputStream fis = new FileInputStream(file);
BufferedReader dis = new BufferedReader(new InputStreamReader(fis));
StringBuffer buff = new StringBuffer();
String line = null;
while ((line = dis.readLine()) != null) {
    buff.append(line);
...

String result = "";
try {
    FileInputStream file = new FileInputStream(fileName);
    byte[] b = new byte[file.available()];
    file.read(b);
    file.close();
    result = new String(b);
} catch (FileNotFoundException e) {
...

BufferedReader reader = new BufferedReader(new FileReader(filename));
String line = null;
StringBuilder stringBuilder = new StringBuilder();
String ls = System.getProperty("line.separator");
while ((line = reader.readLine()) != null) {
    stringBuilder.append(line);
    stringBuilder.append(ls);
return stringBuilder.toString();