readallbytes java example

Java 1.8 and below equivalent for InputStream.readAllBytes()

stackoverflow.com › questions › 59049358 › java-1-8-and-below-equivalent-for-inputstream-readallbytes

Here's one way to solve this without relying on third-party libraries:

inputStream.reset();
byte[] bytes = new byte[inputStream.available()];
DataInputStream dataInputStream = new DataInputStream(inputStream);
dataInputStream.readFully(bytes);

Or if you don't mind using thirdparties (Commons IO):


byte[] bytes = IOUtils.toByteArray(is);

Guava also helps:

byte[] bytes = ByteStreams.toByteArray(inputStream);

Answer from Mark Bramnik on Stack Overflow

Mkyong

mkyong.com › home › java › java files.readallbytes example

Java Files.readAllBytes example - Mkyong.com

April 8, 2019 - byte[] content = Files.readAllBytes(Paths.get("app.log")); System.out.println(new String(content)); A Java example to write and read a normal text file.

TutorialsPoint

tutorialspoint.com › article › when-to-use-the-readallbytes-method-of-inputstream-in-java-9

When to use the readAllBytes() method of InputStream in Java 9?

June 12, 2025 - We can use the readAllBytes() method from the InputStream class to read all bytes into a byte array. The Java InputStream class is the superclass of all classes representing an input stream of bytes.

Java Guides

javaguides.net › 2023 › 09 › java-files-readallbytes.html

Java Files readAllBytes()

September 27, 2023 - The Files.readAllBytes() method reads all the bytes from a file. The method ensures that the file is closed when all bytes have been read or an I/O error, or other runtime error, occurs.

Attacomsian

attacomsian.com › blog › java-files-readallbytes-example

How to read a file using Files.readAllBytes() in Java

December 11, 2019 - try { // read all bytes byte[] bytes = Files.readAllBytes(Paths.get("input.txt")); // convert bytes to string String content = new String(bytes); // print contents System.out.println(content); } catch (IOException ex) { ex.printStackTrace(); ...

Stack Overflow

stackoverflow.com › questions › 59049358 › java-1-8-and-below-equivalent-for-inputstream-readallbytes

Java 1.8 and below equivalent for InputStream.readAllBytes() - Stack Overflow

Top answer

1 of 2

Here's one way to solve this without relying on third-party libraries:

inputStream.reset();
byte[] bytes = new byte[inputStream.available()];
DataInputStream dataInputStream = new DataInputStream(inputStream);
dataInputStream.readFully(bytes);

Or if you don't mind using thirdparties (Commons IO):


byte[] bytes = IOUtils.toByteArray(is);

Guava also helps:

byte[] bytes = ByteStreams.toByteArray(inputStream);

2 of 2

You can use the good old read method like this:

   public static byte[] readAllBytes(InputStream inputStream) throws IOException {
    final int bufLen = 1024;
    byte[] buf = new byte[bufLen];
    int readLen;
    IOException exception = null;

    try {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        while ((readLen = inputStream.read(buf, 0, bufLen)) != -1)
            outputStream.write(buf, 0, readLen);

        return outputStream.toByteArray();
    } catch (IOException e) {
        exception = e;
        throw e;
    } finally {
        if (exception == null) inputStream.close();
        else try {
            inputStream.close();
        } catch (IOException e) {
            exception.addSuppressed(e);
        }
    }
}

Tabnine

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Code Library - Tabnine

July 25, 2024 - Get the answers and suggestions you need from our AI code assistant. Get started in minutes with a free 90 day trial of Tabnine Pro.

LogicBig

logicbig.com › how-to › code-snippets › jcode-java-io-files-readallbytes.html

Java IO & NIO - Files.readAllBytes() Examples

Java Tips

javatips.net › api › java.nio.file.files.readallbytes

Java Examples for java.nio.file.Files.readAllBytes - Javatips.net

public static void main(String[] args) throws Exception { // get reference of source/input file java.nio.file.Path path = java.nio.file.Paths.get("input.pdf"); // read all the contents from source file into ByteArray byte[] data = java.nio.file.Files.readAllBytes(path); // create an instance of Stream object from ByteArray contents InputStream is = new ByteArrayInputStream(data); // Instantiate Document object from stream instance Document pdfDocument = new Document(is); // setup new file to be added as attachment FileSpecification fileSpecification = new FileSpecification("test.txt", "Sample text file"); // Specify Encoding property setting it to FileEncoding.None fileSpecification.setEncoding(FileEncoding.None); // add attachment to document's attachment collection pdfDocument.getEmbeddedFiles().add(fileSpecification); // save new output pdfDocument.save("output.pdf"); }

OpenJDK

cr.openjdk.org › ~joehw › jdk11 › 8201276 › specdiff › java › nio › file › Files.html

method:readAllBytes(java.nio.file.Path) [CHANGED]

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Oracle

docs.oracle.com › javase › 9 › docs › api › java › io › InputStream.html

InputStream (Java SE 9 & JDK 9 )

public byte[] readAllBytes() throws IOException · Reads all remaining bytes from the input stream. This method blocks until all remaining bytes have been read and end of stream is detected, or an exception is thrown. This method does not close the input stream.

Microsoft Learn

learn.microsoft.com › en-us › dotnet › api › java.io.inputstream.readallbytes

InputStream.ReadAllBytes Method (Java.IO) | Microsoft Learn

Reads all remaining bytes from the input stream. [Android.Runtime.Register("readAllBytes", "()[B", "GetReadAllBytesHandler", ApiSince=33)] public virtual byte[]? ReadAllBytes(); [<Android.Runtime.Register("readAllBytes", "()[B", "GetReadAllBytesHandler", ApiSince=33)>] abstract member ReadAllBytes : unit -> byte[] override this.ReadAllBytes : unit -> byte[] Byte[] a byte array containing the bytes read from this input stream ...

How to do in Java

howtodoinjava.com › home › i/o › read file to byte[] in java

Read File to Byte[] in Java

December 14, 2022 - In Java, reading a file to byte array may be needed in various situations. For example, passing the information through the network and other APIs for further processing. Let’s learn about a few ways of reading data from files into a byte array in Java. The Files.readAllBytes() is the best method for using Java 7, 8 and above.

Microsoft Learn

learn.microsoft.com › en-us › dotnet › api › java.nio.filenio.files.readallbytes

Files.ReadAllBytes(IPath) Method (Java.Nio.FileNio) | Microsoft Learn

Microsoft makes no warranties, express or implied, with respect to the information provided here. Reads all the bytes from a file. [Android.Runtime.Register("readAllBytes", "(Ljava/nio/file/Path;)[B", "", ApiSince=26)] public static byte[]? ...

Stack Overflow

stackoverflow.com › questions › 858980 › file-to-byte-in-java

File to byte[] in Java - Stack Overflow

Top answer

1 of 16

1517

From JDK 7 you can use Files.readAllBytes(Path).

Example:

import java.io.File;
import java.nio.file.Files;

File file;
// ...(file is initialised)...
byte[] fileContent = Files.readAllBytes(file.toPath());

2 of 16

584

It depends on what best means for you. Productivity wise, don't reinvent the wheel and use Apache Commons. Which is here FileUtils.readFileToByteArray(File input).

DEV Community

dev.to › tomaszs2 › java-files-readallbytes-4m6i

Java: Files.readAllBytes() - DEV Community

January 24, 2021 - Files.readAllBytes() reads all the bytes from a file #java.

Linux Hint

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Oracle

docs.oracle.com › en › java › javase › 11 › docs › api › java.base › java › io › InputStream.html

InputStream (Java SE 11 & JDK 11 )

January 20, 2026 - While the stream is open, the available(), read(), read(byte[]), read(byte[], int, int), readAllBytes(), readNBytes(byte[], int, int), readNBytes(int), skip(long), and transferTo() methods all behave as if end of stream has been reached.

iO Flood

ioflood.com › blog › read-file-java

Read Files in Java: Guide to File and Reader Classes

February 20, 2024 - In this comprehensive guide, we’ve journeyed through the process of reading files in Java, starting from the basics and gradually moving towards more advanced techniques. We began with the basic use of readAllBytes() method, a simple yet powerful way to read small files.

Stack Overflow

stackoverflow.com › questions › 63855541 › having-trouble-getting-readallbytes-method-to-work

java - Having trouble getting readAllBytes() method to work - Stack Overflow

I am trying to use the readAllBytes() method for an assignment and I can't get it to work. My teacher there is another way he intended it to work using That method is not defined for DataInputStream. Take a look at the read(byte[]) method and the first integer in the datastream shows how large the byte Array is. Either way will work, I just am getting an error on line 39, and if I delete "import java.io.DataInputStream;" it fixes that error but I get an error on line 31 instead.

Mkyong

mkyong.com › home › java › java – how to convert file to byte[]

Java - How to convert File to byte[] - Mkyong.com

September 17, 2020 - private static void readFileTo...7</version> </dependency> The below example uses the NIO Files.readAllBytes to read an image file into a byte[], and Files.write to save the byte[] into a new image file....