![]() If I was writing this code for my own project, I would use proper object-oriented principles like encapsulation, abstraction, polymorphism, etc. There is a difference between writing code for your personal or work project and writing code to explain and teach concepts. Download CodeĪll code files are available from Github. When encoding isn’t correct, you’ll see funny characters appear when reading files.Īll examples for reading text files use two encoding variations:ĭefault system encoding where no encoding is specified and explicitly setting the encoding to UTF-8. Usually, the assumption is correct but sometimes you want to be explicit when instructing your programs to read from files. EncodingĬharacter encoding is not explicitly saved with text files so Java makes assumptions about the encoding when reading files. File LocationĪll examples will read test files from C:\temp. All examples used in this article use the try-with-resources statement for importing, loading, parsing and closing files. You no longer need to write explicit code to close streams because the JVM will automatically close the stream for you, whether an exception occurred or not. JDK7 introduced the try-with-resources statement, which simplifies the process of closing streams. Prior to JDK7, when opening a file in Java, all file resources would need to be manually closed using a try-catch-finally block. .FileUtils.readLines() – Apache Commons.This article aims to be a comprehensive collection of all the different methods. There are multiple ways of reading from files in Java. The main incompatibility is the use of lambda expressions which was introduced in Java 8. Otherwise, the code works unaltered for different Java versions. When there is an incompatibility, it will be stated in that section. All code for this article has been tested on: Java code samples don’t live in isolation, especially when it comes to Java I/O, as the API keeps evolving. 1b) Files.readAllLines() – Explicit Encoding.1a) Files.readAllLines() – Default Encoding.1b) FileReader – Explicit Encoding (InputStreamReader).That way, you will have some hard data to know the performance metrics of each method. I also put each of these methods to a real performance test and document the results. ![]() I’m going to cover reading files in multiple ways with the core Java libraries as well as two third party libraries.īut that’s not all – what good is knowing how to do something in multiple ways if you don’t know which way is best for your situation? I’m actually going to cover 15 different ways to read a file in Java. Too often, you’ll read an article that tells you one way to read a file, only to discover later there are other ways to do that. I’m going to cover all the ways you can read files in Java. This article aims to be the definitive guide for reading files in Java 7, 8 and 9. Something that worked in an earlier Java version, might not be the preferred method anymore. Something that’s quick and dirty for a small example file might not be the best method to use when you need to read a very large file. There are multiple ways of accomplishing the same task and it’s often not clear which file reading method is best to use. ![]() F4, the copied path would be similar to: "C:\\example\\path with spaces\\file.Reading files in Java is the cause for a lot of confusion. After selecting this option and using e.g. If you have any trouble copying a file or folder path normally or need the path to be quoted, you should be able to use Shift Right-Click to display a Copy as path option in Windows. The direct hotkey method (above) creates strings without quotes e.g.: C:\\example\\path with spaces\\file.ext This may take a couple seconds, so extra quick fingers might cause minor issues when pasting. You should be able to simply "Copy" a file as normal and, with the AutoHotkey script above, get a string path to the file after pressing e.g. If you mean to install AutoHotkey or to create a more complex script, I understand. clipboard item path into double backslashes (\\)į4::StringReplace, clipboard, clipboard, \, \\, All In AutoHotkey, to do a simple replacement to "double" the number of \ characters in an item path string via hotkey is relatively easy: Turn all single backslashes (\) in the current I guess Autohotkey could work, but to be honest it's not really worth the effort. Disclaimer: Not a Netbeans solution (unfortunately).
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