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

ListreadFile(String filename)
read File 
List<Byte> result = new ArrayList<>();
try (FileInputStream file = new FileInputStream(filename)) {
    byte[] buffer = new byte[64 * 1024];
    int bytesRead = 0;
    while ((bytesRead = file.read(buffer)) > 0) {
        for (int i = 0; i < bytesRead; i++)
            result.add(buffer[i]);
} catch (IOException e) {
    throw new RuntimeException(e);
return result;
byte[]readFile(String fileName)
read File 
try {
    DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream(fileName)));
    int n = in.available();
    byte[] t = new byte[n];
    int i = 0;
    while (in.available() != 0) {
        t[i] = in.readByte();
        i++;
...
byte[]readFile(String filename)
read File 
File file = new File(filename);
long len = file.length();
byte data[] = new byte[(int) len];
FileInputStream fin = new FileInputStream(file);
int r = fin.read(data);
if (r != len) {
    throw new IOException("Only read " + r + " of " + len + " for " + file);
fin.close();
return data;
InputStreamreadFile(String fileName)
read File 
InputStream result = null;
try {
    result = new java.io.FileInputStream(fileName);
} catch (FileNotFoundException ex) {
    throw new IllegalArgumentException(ex);
if (result == null) {
    throw new IllegalArgumentException("Impossible to open the file.");
...
byte[]readFile(String fileName)
Reads a file and return its content as a byte array. 
return readFile(new File(fileName));
StringreadFile(String filename)
read File 
File d = new File(filename);
FileInputStream fin = new FileInputStream(d);
byte b[] = readStream(fin);
fin.close();
return new String(b);
byte[]readFile(String filename)
read File 
File file = new File(filename);
long len = file.length();
byte data[] = new byte[(int) len];
FileInputStream fin = new FileInputStream(file);
int r = fin.read(data);
if (r != len)
    throw new IOException("Only read " + r + " of " + len + " for " + file);
fin.close();
...
byte[]readFile(String fileName)
read File 
FileInputStream in = new FileInputStream(fileName);
byte[] bytes = new byte[in.available()];
in.read(bytes);
in.close();
return bytes;
byte[]readFile(String filename)
Read a file into a buffer sized the size of the file 
File file = new File(filename);
FileInputStream stream = new FileInputStream(file);
return readFromInputStream(stream);
Stringreadfile(String filename)
readfile 
String ret = "";
File file = new File(filename);
int ch;
StringBuffer strContent = new StringBuffer("");
FileInputStream fin = null;
try {
    fin = new FileInputStream(file);
    while ((ch = fin.read()) != -1)
...