#inputstream Archives - Programmer Gate

July 29, 2018

Java – Convert File to byte[]

This tutorial shows several ways to convert a File object to a byte[] array in Java. 1- Traditional way The traditional conversion way is through using read() method of InputStream as the following:

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public static byte[] convertUsingTraditionalWay(File file)

{

byte[] fileBytes = new byte[(int) file.length()];

try(FileInputStream inputStream = new FileInputStream(file))

{

inputStream.read(fileBytes);

}

catch (Exception ex)

{

ex.printStackTrace();

}

return fileBytes;

}

2- Java NIO With Java 7, you can do the conversion using Files utility class of nio package:

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public static byte[] convertUsingJavaNIO(File file)

{

byte[] fileBytes = null;

try

{

fileBytes = Files.readAllBytes(file.toPath());

}

catch (Exception ex)

{

ex.printStackTrace();

}

return fileBytes;

}

3- Apache Commons IO Besides JDK, you can...

Java core

July 12, 2018

Java – Convert InputStream to String

This tutorial shows several ways to convert an InputStream to a String in Java. 1- BufferedReader The common way for generating a String out of an InputStream is through using BufferedReader as the following:

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public static String convertInputStreamToStringBufferredReader(InputStream is) throws IOException

{

StringBuilder output = new StringBuilder();

try(Reader reader = new BufferedReader(new InputStreamReader(is, Charset.forName(StandardCharsets.UTF_8.name()))))

{

int c = 0;

while((c = reader.read()) != -1){

output.append((char) c);

}

return output.toString();

}

2- Scanner Another common way is to use a Scanner object as the following:

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public static String convertInputStreamToStringScanner(InputStream is) throws IOException

{

String output = null;

try(Scanner scanner = new Scanner(is, StandardCharsets.UTF_8.name()).useDelimiter("\\A"))

{

output = scanner.hasNext() ? scanner.next() : "";

}

return output;

}

3- Java 8 With Java 8, you can generate a...

Java core

July 11, 2018

Java – Convert InputStream to File

This tutorial shows several ways to convert InputStream to File in Java. 1- Common way The common way for converting InputStream to File is through using OutputStream. You can’t directly create a File object from InputStream. However, you can read the InputStream and write it to a File using FileOutputStream as the following:

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public static void convertInputStreamToFileCommonWay(InputStream is) throws IOException

{

OutputStream outputStream = null;

try

{

File file = new File("C:\\Users\\user\\Desktop\\test\\output.txt");

outputStream = new FileOutputStream(file);

int read = 0;

byte[] bytes = new byte[1024];

while ((read = is.read(bytes)) != -1) {

outputStream.write(bytes, 0, read);

}

finally

{

if(outputStream != null)

{

outputStream.close();

}

2- java.nio (Java 8) Using nio...

Tagged: #inputstream

Java – Convert File to byte[]

Java – Convert InputStream to String

Java – Convert InputStream to File

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