Java Utililty Methods FileInputStream Read

List of utility methods to do FileInputStream Read

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Description

The list of methods to do FileInputStream Read are organized into topic(s).

Method

byte[]readFile(File file)
Returns file's contents in a byte array.. 
byte[] cont = null;
FileInputStream fi = new FileInputStream(file);
try {
    long len = file.length();
    cont = new byte[(int) len];
    fi.read(cont);
} finally {
    fi.close();
...
byte[]readFile(File file)
read File 
if (!file.exists() || file.isDirectory())
    return null;
try {
    FileInputStream fileinputstream = new FileInputStream(file);
    byte abyte0[] = new byte[fileinputstream.available()];
    fileinputstream.read(abyte0);
    fileinputstream.close();
    return abyte0;
...
byte[]readFile(File file)
read File 
return readStream(new FileInputStream(file));
byte[]readFile(File file)
read File 
byte[] bytes = null;
InputStream inStream = null;
long length = file.length();
try {
    inStream = new FileInputStream(file);
    if (length > Integer.MAX_VALUE) {
        throw new IOException("File too long " + file.getName());
    bytes = new byte[(int) length];
    int offset = 0;
    int numRead = 0;
    while (offset < bytes.length && (numRead = inStream.read(bytes, offset, bytes.length - offset)) >= 0) {
        offset += numRead;
    if (offset < bytes.length) {
        throw new IOException("Could not completely read file " + file.getName());
} finally {
    if (inStream != null) {
        inStream.close();
return bytes;
byte[]readFile(File file)
read File 
FileInputStream fis = null;
try {
    fis = new FileInputStream(file);
    int length = (int) file.length();
    ByteArrayOutputStream baos = new ByteArrayOutputStream(length);
    byte[] buffer = new byte[4096];
    int i = 0;
    while (i < length) {
...
byte[]readFile(File file)
read File 
if (file.length() > 10000000) {
    throw new IOException("File too big: " + file.getAbsolutePath() + ", size: " + file.length());
byte[] data = new byte[(int) file.length()];
InputStream in = new FileInputStream(file);
try {
    in.read(data);
} finally {
...
byte[]readFile(File file)
read File 
FileInputStream fis = new FileInputStream(file);
byte[] buf = new byte[2048];
int read;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
while ((read = fis.read(buf)) != -1) {
    bos.write(buf, 0, read);
fis.close();
...
StringreadFile(File file)
read File 
try {
    FileInputStream fis = new FileInputStream(file);
    byte[] data = new byte[(int) file.length()];
    fis.read(data);
    fis.close();
    String str = new String(data, "UTF-8");
    return str;
} catch (IOException e) {
...
byte[]readFile(File file)
Reads a file, and returns all bytes from that file. 
BufferedInputStream in = null;
try {
    in = new BufferedInputStream(new FileInputStream(file));
    byte[] d = new byte[in.available()];
    in.read(d);
    return d;
} catch (Exception exception) {
    exception.printStackTrace();
...
byte[]readFile(File file)
Read the given file, returning a byte[] of its contents. 
if (file == null) {
    throw new NullPointerException("file == null");
long length = file.length();
int len = (int) length;
if (length != len) {
    throw new RuntimeException("File too long: " + file);
byte[] buf = new byte[len];
FileInputStream fis = new FileInputStream(file);
int at = 0;
while (at < len) {
    int amt = fis.read(buf, at, len - at);
    if (amt == -1) {
        throw new RuntimeException("Unexpected EOF at " + at + " in file: " + file);
    at += amt;
return buf;