Using IOUtils.toByteArray () and FileUtils.readFileToByteArray () methods.
When we read a large number of bytes, the application performance will be poor, due to a large number of context switches involved.įor writing the bytes read from the URL to our local file, we'll use the write() method from the FileOutputStream class: try (BufferedInputStream in = new BufferedInputStream(new URL(FILE_URL). File to byte array conversion using Files.readAllBytes () Java 7 onward you can use static method readAllBytes (Path path) in the Files class for converting file to byte array. This context switch is expensive from a performance perspective. import java.io.File import java.io. Program 1: Convert a String into byte and write in a file. Now if you examine the file content as binary, you see the BOM at the beginning. To convert byte to file getBytes () method of String class is used, and simple write () method can be used to convert that byte into a file.
To create an UTF8 file with a BOM, open the Windows Notepad, create a simple text file and save it as utf8.txt with the encoding UTF-8. When the JVM invokes the read() system call, the program execution context switches from user mode to kernel mode and back. In fact, Java assumes the UTF8 dont have a BOM so if the BOM is present it wont be discarded and it will be seen as data. When reading one byte at a time using the read() method, each method call implies a system call to the underlying file system.
By calling touch filename, it is possible to choose from a zero-byte file name. The performance increase comes from buffering. Creating a zero-byte file can involve using a wide range of methods: selecting content in a text editor, requesting it using an operating system utility, or simply creating files using a program. When reading from an InputStream, it's recommended to wrap it in a BufferedInputStream to increase the performance. BufferedInputStream in = new BufferedInputStream(new URL(FILE_URL).openStream())