Ioutils tobytearray example Using Third-Party Libraries Utilizing Apache Commons IO Library Include the Apache Commons IO library in your project. Demonstrated by nio. See full list on baeldung. This class provides static utility methods for input/output operations. toByteArray Files. io. IOException Gets the contents of an InputStream as a byte[]. If you're on java 9 or later and you have an input stream to read you can use InputStream#readAllBytes (). Dec 2, 2015 · Your code crash exactly because of IOUtils. [Deprecated] closeQuietly - these methods close a stream ignoring nulls and exceptions toXxx/read - these methods read data from a stream write - these methods write data to a stream copy - these methods copy all the data from one stream to another contentEquals - these methods This java examples will help you to understand the usage of java. Learn how to efficiently convert an InputStream to a byte array in Java with step-by-step examples and best practices. ioutils #toByteArray () . getBytes() instead in a spring boot application or Apr 23, 2013 · Then call toByteArray () on your ByteArrayOutputStream. apache. Example 1 The following examples show how to use org. IOException For example, the creation of a ResettableInputStream would entail physically opening a file. For more informations, see this for example: Most Robust way of reading a file or stream using Java (To prevent DoS attacks) This code works fine on a 200 MB file, thanks to @SlipperySeal and this: Java: How to create SHA-1 for a file? Mar 31, 2010 · Spring Resource loader with getResource () example June 23, 2011 by mkyong Spring’s resource loader provides a very generic getResource () method to get the resources like (text file, media file, image file…) from file system , classpath or URL. MAX_VALUE to read the stream until EOF General IO stream manipulation utilities. Oct 28, 2013 · Example shows how to reads the contents of a file into a byte array. Jul 25, 2025 · When working with Java I/O operations, a common task involves reading data from an InputStream and converting it into a byte[] array. Feb 2, 2024 · Convert InputStream to Byte Array Using the toByteArray() Method in Java If you work the Apache library, you can use the toByteArray() method of IOUtils class to get all the data into the byte array. In this Java tutorial, we learn how to read the InputStream object as a byte array using IOUtils utility class of Apache Commons IO library. util. toByteArray method from Apache Commons IO has been deprecated, prompting developers to seek alternative methods for converting InputStreams into byte arrays. IOUtils class. addPicture(pictureData, PictureData. The IOUtils type has a static method to read an InputStream and return a byte[]. You can get the getResource () method from the application context. The following examples show how to use org. All members functions of this class deals with Input – Output streams Manipulations, and it really helps to write programs which deals with such matters. toByteArray public static byte [] toByteArray (java. Using Apache POI library it becomes easy to insert or add images into excel file. createSlide(); byte[] pictureData = IOUtils. IOUtils #toByteArray () . toByteArray (new FileInputStream (file)), SHA doesnt matter. utils, class: IOUtils Aug 16, 2010 · 0 Using Kotlin and org. I have problems to convert an InputStream into a byte array: private static final String LOREM_IPSUM = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. It contains three methods that allow us to easily convert from InputStream to ByteArray. The methods work with InputStream, OutputStream, Reader and Writer. 3. Dec 11, 2014 · In this example we are going to elaborate the use of the IOUtils class in the package: ‘org. Apache Commons IO. pdfbox. UTF_8). The supported picture types are PNG, JPG, and DIB. createPicture(pd); picture. toByteArray( inputStream ), see apache commons io. toByteArray () in a try-catch block to handle IOExceptions. The following java examples will help you to understand the usage of org. toByteArray(is); Here you can use Base64 to convert Byte Array to String. toByteArray () and FileUtils. Here we will be using an object of ByteArrayOutputStream class as a buffer. You could use Guava's ByteStreams. Oct 9, 2012 · Commons IO library provides utility classes for file and stream manipulation in Java. toByteArray(input); } I mean is it possible that letterContent in this method change incorrectly because of concurrency? The following examples show how to use org. Example 1 Source File: CalculateDigest. Example #1 Introduction In this page you can find the example usage for org. Jan 8, 2024 · Learn how to use Java Streaming IO functions and the built-in Base64 class to load binary data as an InputStream and then convert it to a String. You are encouraged to always specify an encoding because relying on the platform default can lead to unexpected results, for example when moving from development to production. What I need is a paragraph to show a The Apache Commons IO library contains utility classes, stream implementations, file filters, file comparators, endian transformation classes, and much more. In the Apache Commons IO library, there is a class called IOUtils. Nov 4, 2025 · User guide Commons-IO contains utility classes, endian classes, line iterator, file filters, file comparators and stream implementations. Example 1 Parameters: Throws: toByteArray public static byte[] toByteArray(java. toByteArray public static byte[] toByteArray(java. Introduction In this page you can find the example usage for org. toByteArray(InputStream input) Gets the contents of an InputStream as a byte []. toByteArray FileUtils. IOUtils v2 is simple like that: IOUtils. common. 0 6 votes @Test public void getInputStreamCache() throws IOException { requestEx. Using Guava Another good way to read data into a byte array is in Google Guava library. readAllBytes, Guava ByteStreams. google. toByteArray(inputStream1); byte [] inputImageBytes2 = IOUtils. poi. These source code samples are taken from different open source projects The following examples show how to use org. util IOUtils toByteArray. Dec 1, 2017 · In this tutorial, I will guide you to convert from InputStream to ByteArray using Apache Commons IO library. ByteArrayInputStream. Sample Code Jan 29, 2010 · 9 A simple way would be to use org. I've a code snippet like ths: Solution: Always specify the desired Charset, for example, str. commons. compress. In this post, we will see about the Apache Commons IO IOUtils class. This method also buffers the input internally, so there is no need to use a BufferedInputStream, but it’s not null-safe. 0 6 votes The following examples show how to use org. This can be necessary for various purposes, such as processing data in memory, sending data over a network, or storing it in a different format. We’re using PNG here: The following examples show how to use org. Example 1 The following code example shows how to examples for best-practice techniques when writing unit and integration tests using an AWS SDK. The methods of this class as other classes of Apache Commons are Introduction In this page you can find the example usage for org. It throws NullPointerException if the input is null. utils. declaration: package: org. Example 1 Learn how to fix OutOfMemoryError exceptions with IOUtils. toByteArray () can handle every kind of InputStream without exceptions. Files class to read the file content into a byte array. Mistake: Assuming that IOUtils. toByteArray and Apache IOUtils. toByteArray(new FileInputStream(file)); 4. The byte-to-char methods and char-to-byte methods involve a conversion step. toByteArray(is); Internally this creates a ByteArrayOutputStream and copies the bytes to the output, then calls toByteArray(). MAX_VALUE bytes will either crash with NegativeArraySizeException or maybe worse overflow in such a way that it returns fine (but only with partial data) The ByteArrayOutputStream will happily consume the full stream but "int count" will The following examples show how to use org. Reading the IO tutorial might also help. IOUtils; Solution 2 : write a toByteArray function The following examples show how to use org. toByteArray(new FileInputStream("logo-leaf. The method handles buffering internally, reducing the amount of boilerplate code. That is: Mar 3, 2023 · Using IOUtils. Example 1 Feb 6, 2021 · Can using IOUtils. Two methods are provided in each case, one that uses the platform default encoding and the other which allows you to specify an encoding. Example 1 We would like to show you a description here but the site won’t allow us. class) { { IOUtils. The following example uses the com. Apr 27, 2020 · The IOUtils. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. I'm testing the IOUtils. MAX_VALUE to read the stream until EOF The following examples show how to use org. java From testarea-pdfbox2 with Apache License 2. Example 1 In this Java tutorial, we learn how to get the content of an URL into a byte array using IOUtils utility class of Apache Commons IO library. The following examples show how to use com. Aug 12, 2014 · I need to mock toByteArray () of apache. Example 1 toByteArray public static byte[] toByteArray(java. InputStream stream, int length) throws java. The methods work on InputStream, OutputStream, Reader and Writer. Example 1. Jul 18, 2012 · to download the commons IO jar (see link) and set your classpath accordingly this import at the start of your class : import org. These source code samples are taken from different open source projects May 14, 2013 · Fryta's answer outline how to actually use IOUtils and snj's answer is good for files. io package provides a general file manipulation Jul 14, 2020 · The Apache Commons IO has utilities to help with various IO functionalities. getInputStream(); new Expectations(IOUtils. The IOUtils. For a more detailed descriptions, take a look at the Javadocs. PictureType. If the opened file is meant to be closed only (in a finally block) by the very same code block that created it, then it is necessary that the release method must not be called while the execution is made in other stack frames. com The following java examples will help you to understand the usage of org. This method buffers the input internally, so there is no need to use a BufferedInputStream. byte[] bytes = IOUtils. For example: IOUtils. This method returns a byte array that can be passed further into the String constructor to print the textual data. These source code samples are taken from different open source projects. Utility classes IOUtils IOUtils contains utility methods dealing with reading, writing and copying. In this Java tutorial, we learn how to get the content of an URI into a byte array using IOUtils utility class of Apache Commons IO library. Here are some recommended approaches. length - The maximum length to read, use Integer. io’, as the package name says it is a part of Apache Commons IO. readFileToByteArray InputStream is; byte[] bytes = IOUtils. toByteArray creates a ByteArrayOutputStream and efficiently copies the input stream’s content in blocks, managing memory effectively even for large files. We can use the ByteStreams utility class, as shown in the following example. Example of using Apache Commons IO to convert an InputStream to byte [] byte [] bytes = IOUtils . inputStream() I guess is the same way in Java too. toByteArray. setCacheRequest(true); ServletInputStream inputStream = request. In this Java tutorial, we learn how to get the content of an URL into a byte array using IOUtils utility class of Apache Commons IO library. toByteArray (InputStream input) invoked with a Stream which feeds more than Integer. Files. amazonaws. Let us learn the following methods: This method demonstrates how to read data from the InputStream and convert it into a byte array, then print the contents of the byte stream as a string using a BufferedInputStream. Dec 19, 2024 · The transferTo method introduced in Java 9 simplifies streaming from an InputStream to an OutputStream. toByteArray(InputStream input) method. toByteArray() method, which does all that for you, or you could read its source code to have a better idea of how it does it. Add Picture in the Workbook Now, we’ll use the byte array to add a picture to our workbook. Use the IOUtils. toByteArray(inputStream2); Copy 3. Example 1 Example #11 Source File: TestStandardHttpServletRequestEx. InputStream input) throws java. setAnchor(new Rectangle(320, 230, 100, 92)); And this works very much as expected. For this, we read each byte from a InputStream class and write it to a ByteArrayOutputStreamclass. IOException Reads up to length bytes from the input stream, and returns the bytes read. Solution: Wrap IOUtils. "; @Test p Oct 24, 2018 · I am working on a spring boot application and needed to use toByteArray method provided by IOUtils, but it is deprecated. Example 1 Dec 5, 2021 · Here, we’ll use IOUtils from apache-poi: byte [] inputImageBytes1 = IOUtils. Contribute to apache/commons-io development by creating an account on GitHub. PNG); XSLFPictureShape picture = slide. General IO stream manipulation utilities. Aug 12, 2009 · You can use Apache Commons IO to handle this and similar tasks. Example 1 Apr 10, 2024 · XMLSlideShow ppt = new XMLSlideShow(); ppt. Jul 23, 2025 · Example 2: Using ByteArrayOutputStream Class This is an indirect method of conversion of input stream data into a byte array. 2) Using Apache Commons FileUtils The FileUtils class from org. In this tutorial we will see an example on how to add images to excel file using Apache POI in Java programming language. You may check out the related API usage on the sidebar. toByteArray () in Java, including causes and code solutions. readFileToByteArray () methods Apache commons IO also provides utility methods to read file content into a byte array. IOUtils. toByteArray(inputStream); Learn how to efficiently convert an InputStream to a Base64 string in Java with step-by-step instructions and code snippets. closeQuietly - these methods close a stream ignoring nulls and exceptions toXxx/read - these methods read data from a stream write - these methods write data to a stream copy - these methods copy all the data from one stream to another contentEquals - these methods compare the The following examples show how to use org. Is it safe to use string. InputStream stream, int length, int maxLength) throws java. java From servicecomb-java-chassis with Apache License 2. toByteArray(is). Example 1 IOUtils class provide utility methods for reading, writing and copying files. closeQuietly - these methods close a stream ignoring nulls and exceptions toXxx/read - these methods read data from a stream write - these methods write data to a stream copy - these methods copy all the data from one stream to another contentEquals - these methods compare the Jul 25, 2025 · Internally, IOUtils. ToByteArray leads to concurrency problems? private byte[] saveLetterContent(InputStream input) { byte[] letterContent = IOUtils. To convert an input stream to byte array in Java is quite easy. toByteArray(inputStream); Code language: Java (java) InputStream to Byte Array Using Guava Library Similarly, the Guava Library also provides a simple and concise way. Jan 8, 2024 · The article shows the alternatives for returning image (or other media) with Spring MVC and discusses the pros and cons of each approach. Parameters: stream - The byte stream of data to read. As an example, consider the This java examples will help you to understand the usage of org. io IOUtils toByteArray. The toByteArray () method returns a byte [] containing all the bytes from the given InputStream. getBytes (StandardCharsets. Example 1 Dec 14, 2022 · A similar class is IOUtils which can be used in the same way. png")); XSLFPictureData pd = ppt. uchimnu vpqf fzzy qefa qjbd ezmrvt oonhd tsrbiwz bhgx enb kgpgxf khip mlfq zzlpxa qfhgvs