readallbytes java example github

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

GitHub

github.com › AdoptOpenJDK › openjdk-jdk11 › blob › master › test › jdk › java › io › InputStream › ReadAllBytes.java

openjdk-jdk11/test/jdk/java/io/InputStream/ReadAllBytes.java at master · AdoptOpenJDK/openjdk-jdk11

import java.util.Random; import jdk.test.lib.RandomFactory; · /* * @test · * @bug 8080835 8193832 · * @library /test/lib · * @build jdk.test.lib.RandomFactory · * @run main ReadAllBytes · * @summary Basic test for InputStream.readAllBytes · * @key randomness ·

Author AdoptOpenJDK

Java Guides

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

Java Files readAllBytes()

September 27, 2023 - In this example, Files.readAllBytes() is used to read all the bytes from the file sample.txt. The bytes are then converted into a String for display. The method provides a quick way to read the entire content of a file without having to loop ...

Discussions

Support ByteStreams.toByteArray -> inputStream.readAllBytes()

Instead of Guava's ByteStreams#toByteArray(), InputStream.html#readAllBytes should be used. The latter is available since Java 9. More on github.com

github.com

January 12, 2024

There are so many Reader classes. Which one should I use to read from a file?

There are 2 axes to think about: What am I reading? Binary or text? If I'm reading binary, use an InputStream. If I'm reading text, use a Reader. A Reader basically wraps an InputStream and handles the conversion from whatever encoding was used to store the text (e.g., UTF-8, ISO-8859-1, etc.) What do I have? If you have a File, use a FileInputStream or FileReader. If you already have an InputStream, use an InputStreamReader. The other thing is that these things "stack". So if you have a File with some text, probably the best thing to do is to create a new BufferedReader(new FileReader(file)) BufferedReader is nice because you can read one line at a time using readLine(). BUT, there's a glitch here, which is that doing it that way doesn't set you specify how text in the file was actually encoded. So what you really need to do is: new BufferedReader(new InputStreamReader(new FileInputStream(file), "utf-8")) Hope that helps. More on reddit.com

r/java

September 2, 2012

Mkyong

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

Java Files.readAllBytes example - Mkyong.com

April 8, 2019 - In Java, we can use Files.readAllBytes to read a file.

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(); ...

Tabnine

tabnine.com › home › code library

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.

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);
        }
    }
}

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.

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 - Below is an example to read content from "Technology.txt" using the readAllBytes() method in Java:

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GitHub

github.com › openrewrite › rewrite-migrate-java › issues › 390

Support ByteStreams.toByteArray -> inputStream.readAllBytes() · Issue #390 · openrewrite/rewrite-migrate-java

January 12, 2024 - Instead of Guava's ByteStreams#toByteArray(), InputStream.html#readAllBytes should be used. The latter is available since Java 9. - String inputStr = new String(ByteStreams. toByteArray(inputStream), Charsets.UJTF_8); + String inputStr = new ...

Author openrewrite

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"); }

LogicBig

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

Java IO & NIO - Files.readAllBytes() Examples

GitHub

github.com › bbossola › vulnerability-java-samples › blob › master › exploit › Encoder.java

vulnerability-java-samples/exploit/Encoder.java at master · bbossola/vulnerability-java-samples

import java.util.Base64; · public class Encoder { · public static void main(String[] args) throws Exception { byte[] classBytes = Files.readAllBytes(new File("Exploit.class").toPath()); byte[] encodedBytes = Base64.getEncoder().encode(classBytes); System.out.println(new String(encodedBytes)); } }

Author bbossola

Medium

medium.com › @alxkm › how-to-read-a-file-into-a-string-in-java-multiple-approaches-6c781a1c3cbd

Java Interview: How to Read a File into a String in Java-Multiple Approaches | by Alex Klimenko | Medium

August 9, 2025 - For modern applications, prefer Files.readString() or Files.readAllBytes(); for external libraries, Apache Commons IO is a great fit. ... Exploring Java backend, algorithms, ML, and continuous learning through architecture best practices. https://github.com/alxkm

CalliCoder

callicoder.com › java-read-file

How to read a File in Java | CalliCoder

February 18, 2022 - import com.sun.org.apache.xpath.internal.operations.String; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; public class FilesReadAllBytesExample { public static void main(String[] args) { try { byte[] data = Files.readAllBytes(Paths.get("demo.txt")); // Use byte data } catch (IOException ex) { System.out.format("I/O error: %s%n", ex); } } } Facebook · Twitter · Linkedin · Reddit · Twitter · Github ·

How to do in Java

howtodoinjava.com › home › i/o › java read file to string (with examples)

Java Read File to String (with Examples)

October 22, 2023 - Path filePath = Path.of("c:/temp/demo.txt"); String fileContent = ""; try { byte[] bytes = Files.readAllBytes(Paths.get(filePath)); fileContent = new String (bytes); } catch (IOException e) { //handle exception } If you are still not using Java ...

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. Check out STJ: Java fantasy card game at... Tagged with java.

OpenJDK

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

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

Diff Report

Mkyong

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

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

September 17, 2020 - package com.mkyong.io.howto; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; public class FileToBytes { public static void main(String[] args) { try { String filePath = "/home/mkyong/test/phone.png"; // file to bytes[] byte[] bytes = Files.readAllBytes(Paths.get(filePath)); // bytes[] to file Path path = Paths.get("/home/mkyong/test/phone2.png"); Files.write(path, bytes); System.out.println("Done"); } catch (IOException e) { e.printStackTrace(); } } } $ git clone https://github.com/mkyong/core-java ·

iO Flood

ioflood.com › blog › read-file-java

Read Files in Java: Guide to File and Reader Classes

February 20, 2024 - Complexity: While BufferedReader is more efficient, it’s also more complex to set up and handle than readAllBytes(). Scanner is another class in Java used for parsing text for primitive types and strings using regular expressions. Here’s an example of how to use it:

Linux Hint

linuxhint.com › java-input-stream-read-all-bytes

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