Java Read Binary File3/17/2021
JavaScript is currently disabled.The legacy API (classes in the java.io.
IO operations such as reading and writing exactly one byte at a time, whereas the NIO API (classes in the java.nio. File IO API. 1. Understanding Byte Streams We use byte streams to read and write data in binary format, exactly 8-bit bytes. All byte stream classes are descended from the abstract classes InputStream and OutputStream. The following class diagram depicts the main classes in the legacy File IO API that are designed for working with binary files: You can notice that these classes implement the AutoCloseable interface, which means that we can use the try-with-resources structure to close these streams automatically. At the top of the hierarchy, the abstract class InputStream defines two primary methods for reading bytes from an input stream: read(): reads one byte of data, returns the byte as an integer value. This method returns -1 if theres no more data or the end of the file is reached. Similarly, the abstract class OutputStream defines two primary methods for writing bytes to an output stream: write(int): writes the specified byte to the output stream. Moving down, the implementation classes FileInputStream and FileOutputStream are for reading and writing streams of raw bytes, one or multiple bytes at a time. Whereas the BufferedInputStream and BufferedOutputStream are more efficient by buffering the input stream and output stream to reduce the number of calls to the native API. Now, lets see some code examples. Reading and Writing Binary Files Using FileInputStream and FileOutputStream The following examples use the FileInputStream and FileOutputStream classes to perform low level binary IO. The source file and destination file are provided from command lines arguments: import java.io. ![]() ![]() ![]() All the above examples can be re-written using buffered streams just by changing the instantiation of the streams. Heres an example: try (. Reading and Writing Binary Files Using New File IO API (NIO) The utility class Files in the java.nio.file package provides the following methods for reading and writing binary data: readAllBytes(Path path): reads all bytes from a file and returns an array of bytes. This method is intended for reading small files, not large ones. Note that both methods close the input and output file after done and throw IOException in case of error. The files copy program above can be re-written using NIO API like this: import java.io. API References: InputStream Javadoc OutputStream Javadoc FileInputStream Javadoc FileOutputStream Javadoc Files Javadoc Paths Javadoc Related File IO Tutorials: How to Read and Write Text File in Java How to read text file line by line in Java Java IO FileInputStream and FileOutputStream Examples Other Java File IO Tutorials: How to list files and directories in a directory in Java Java IO - Common File and Directory Operations Examples Java Serialization Basic Example Understanding Java Externalization with Examples How to execute Operating System Commands in Java 3 ways for reading users input from console in Java File change notification example with Watch Service API Java Scanner Tutorial and Code Examples About the Author: Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on Facebook and watch his Java videos you YouTube. Java Read Binary File Zip Java BinaryAttachments: JavaBinaryFileIOExamples.zip Java Binary File IO Examples 4 kB Add comment Notify me of follow-up comments Send Cancel Comments 2 Adrian Gibanel bTact 2019-10-08 04:34 The program: And the following program runs much faster by copying a chunk of bytes at a time (exactly 4096 bytes at a time): when inputed a 169KB size file it outputs a 172KB size file. It would very nice if you could take into account that not every file size is a 4096 multiple. Thank you. Quote 1 Vishnu Prathap 2018-11-25 22:27 Very helpfull and usefull Quote Refresh comments list See All Java Tutorials CodeJava.net shares Java tutorials, code examples and sample projects for programmers at all levels. CodeJava.net is created and managed by Nam Ha Minh - a passionate programmer. Home About Contact Terms of Use Privacy Policy F acebook T witter Y ouTube Copyright 2012 - 2020 CodeJava.net, all rights reserved.
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