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How to write a byte array to a file in Java?
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In order to convert a byte array to a file, we will be using a method named the getBytes() method of String class. Implementation: Convert a String into a byte array and write it in a file.
Java ByteArrayOutputStream class is used to write common data into multiple files. In this stream, the data is written into a byte array which can be written to multiple streams later. The ByteArrayOutputStream holds a copy of data and forwards it to multiple streams.
byte Syntax in JAVA:byte Variable_Name = Value; For example: byte x = 10; Here x is variable name and 10 is a value assigned to a variable integer data type byte.
Use the default CommonsMultipartFile where you to use the FileDiskItem object to create it. Example: FileItem fileItem = new DiskFileItem("fileData", "application/pdf",true, outputFile. getName(), 100000000, new java.
As Sebastian Redl points out the most straight forward now java.nio.file.Files.write. Details for this can be found in the Reading, Writing, and Creating Files tutorial.
Old answer: FileOutputStream.write(byte[]) would be the most straight forward. What is the data you want to write?
The tutorials for Java IO system may be of some use to you.
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