Java read file from absolute path

Get absolute file path example shows how to get the absolute path of file in Java. The example also shows the difference between path, absolute path, and canonical path.

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This method returns absolute path string of file. As you can see from the output, I created the file without specifying the complete path but I when printed the absolute path, it gave the complete path of the file in the file system. All three methods return String containing the path information of the file, but they differ with one another.

In short, it is the path using which the File object was first created. Current directory and. Parent directory to the actual directories. It also resolves any symbolic links before returning the canonical path. There can be only one canonical path but there could be many absolute paths for the same file. Sounds confusing? Above given all paths are absolute paths for the same file one.

Your output will be different according to your current working directory. My name is RahimV and I have over 16 years of experience in designing and developing Java applications.

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Over the years I have worked with many fortune companies as an eCommerce Architect. My goal is to provide high quality but simple to understand Java tutorials and examples for free. If you like my website, follow me on Facebook and Twitter. Your email address will not be published. Leave a reply. Notify me of follow-up comments by email.Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.

The Path class includes various methods that can be used to obtain information about the path, access elements of the path, convert the path to other forms, or extract portions of a path. There are also methods for matching the path string and methods for removing redundancies in a path. This lesson addresses these Path methods, sometimes called syntactic operations, because they operate on the path itself and don't access the file system.

A Path instance contains the information used to specify the location of a file or directory. At the time it is defined, a Path is provided with a series of one or more names. A root element or a file name might be included, but neither are required.

A Path might consist of just a single directory or file name. You can easily create a Path object by using one of the following get methods from the Paths note the plural helper class:. You can think of the Path as storing these name elements as a sequence.

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The highest element in the directory structure would be located at index 0. The lowest element in the directory structure would be located at index [n-1]where n is the number of name elements in the Path.

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Methods are available for retrieving individual elements or a subsequence of the Path using these indexes. The following code snippet defines a Path instance and then invokes several methods to obtain information about the path:. The previous example shows the output for an absolute path.

Get Absolute path of the file

In the following example, a relative path is specified:. Many file systems use ". You might have a situation where a Path contains redundant directory information. The normalize method removes any redundant elements, which includes any ". It is important to note that normalize doesn't check at the file system when it cleans up a path. It is a purely syntactic operation. To clean up a path while ensuring that the result locates the correct file, you can use the toRealPath method.

This method is described in the next section, Converting a Path. You can use three methods to convert the Path. If you need to convert the path to a string that can be opened from a browser, you can use toUri. For example:.

The toAbsolutePath method converts a path to an absolute path. If the passed-in path is already absolute, it returns the same Path object. The toAbsolutePath method can be very helpful when processing user-entered file names.

java read file from absolute path

The toAbsolutePath method converts the user input and returns a Path that returns useful values when queried. The file does not need to exist for this method to work. The toRealPath method returns the real path of an existing file.

This method performs several operations in one:. This method throws an exception if the file does not exist or cannot be accessed. You can catch the exception when you want to handle any of these cases. You can combine paths by using the resolve method. You pass in a partial pathwhich is a path that does not include a root element, and that partial path is appended to the original path. You can meet this using the relativize method.

This method constructs a path originating from the original path and ending at the location specified by the passed-in path.

The new path is relative to the original path.There are multiple ways of writing and reading a text file. There are several ways to read a plain text file in Java e. Every utility provides something special e. BufferedReader provides buffering of data for fast reading, and Scanner provides parsing ability. We can also use both BufferReader and Scanner to read a text file line by line in Java.

Then Java SE 8 introduces another Stream class java. Stream which provides a lazy and more efficient way to read a file. In general, each read request made of a Reader causes a corresponding read request to be made of the underlying character or byte stream.

For example. This article is contributed by Pankaj Kumar. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Writing code in comment? Please use ide. How to set Precision for Double values in Java? String st.

Java IO: difference between absolute,relative and canonical path

Load Comments. File; import java. FileNotFoundException; import java. File import java. StandardCharsets; import java.When you build a java project and pack it into a jar or a warthe files under the resources folder are included into the jar.

These files may include configuration files, scripts and other resources needed during run time.

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When the software is executed, it may need to load the contents of these files for some kind of processing — may be properties, sql statements, etc. In this article, we show you how to load these resources when the program is running. You can access these files and folders from your java code as shown below.

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Using the method Class. The method returns null if the resource cannot be found or loaded. To read binary resources, you can use directly use the InputStream instance.

For reading a text resource, you can convert it to a Reader instance, possibly specifying the character encoding:. In this article, we demonstrated how to use the Class. Your email address will not be published. Notify me of follow-up comments by email.

Notify me of new posts by email. Skip to content Contents 1. Introduction 2. Packaging Resources 3. Loading the Resources 4. Using Absolute Path of Resource 5.

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See Also. Leave a Reply Cancel reply Your email address will not be published.SCJP 1. Forum: Java in General. Reading files from a directory by giving relative paths. Hello friends, I want to read a file from a directory which is in parallel to the current directory. For example, consider the following directory structure: - Project src org omkar resources test. I am trying to access the file by giving the path argument to the File class as new File ".

I want to access the the test. How do i access the file relatively?

java read file from absolute path

Rob Spoor. I like The current folder which the. That said, try using resources instead of files. That way your code will work even when test. Check out java.

Class getResourceAsStream java. String and java. ClassLoader getResourceAsStream java. Thanks Rob! I had to specify the file as if it was only another java file with its package structure Thanks a lot!

Thanks and Regards Omkar Patkar. David Newton. Using relative paths works fine--as explained previously it's likely you're not starting the relative path from where you think you are. First, you drop a couch from the plane, THEN you surf it. Here, take this tiny ad with you:.

Boost this thread! Load Property file in servlet or jsp.The common way of accessing the file system in java is through the java. File API. In this tutorial, we explain how to use the File API to access a file using absolute and relative paths, we also describe the difference between getPathgetAbsolutePath and getCanonicalPath methods provided by the API.

In general, a path is a way to refer to a particular file or directory in a file system, there are 2 types of path: absolute and relative. One should understand the difference between these 2 types in order to successfully locate a file within a program.

Simply, a path is absolute if it starts with the root element of the file system. In windows, the root element is a drive e. An absolute path is complete in that no other information is required to locate the file, it usually holds the complete directory list starting from the root node of the file system till reaching the file or directory it denotes.

Since absolute path is static and platform dependent, it is a bad practice to locate a file using absolute path inside your program, since you will lose the ability to reuse your program on different machines and platforms.

It is simply the path needed in order to locate the file from within the current directory of your program. It is not complete and needs to be combined with the current directory path in order to reach the requested file. In order to construct a rigid and platform independent program, it is a common convention to use a relative path when locating a file inside your program. In order to access a file using File API, developers normally use the following constructor:. In order to get the path of an existing file object, File api provides 3 different methods:.

Path Operations

The absolute paths of pdf-sample. In the following example, we create a test class FilePathTest. Before discussing accessFileUsingRelativePath method, it is worth to mention that eclipse uses the root directory of the project when constructing a relative path at runtime e. So make sure to keep this in mind when using a relative path in your application. Tags: java java-io. Founder of programmergate. July 6, August 5, August 25, But if you do that on unix, well you are signing up for trouble.

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java read file from absolute path

Java — pass by reference or pass by value. Spring Boot. Deploy Spring Boot application on external Tomcat. Big Data.This tutorial will examine the differences between a file's path, absolute path, and canonical path. The FilePaths class will display data about several files and directories in the project.

In Java S Wa File object can represent a file or a directory. If a File object represents a directory, a call to its isDirectory method returns true. Our project consists of the FilePaths class plus several files and directories.

The FilePaths class is shown below. Looking at the output tells us about path, absolute file, absolute path, canonical file, and canonical path. First off, you probably noticed that getAbsoluteFile returns the same result as getAbsolutePathand getCanonicalFile returns the same result as getCanonicalPath.

Next, you should notice that getPath returns the file path that we used when we instantiated the File object with the String file path, but with the current system's path separation character.

Since I'm on Windows XP, this is a backslash. If this path is relative, getPath returns the relative path, whereas if we specified a full path when instantiating the File object, the full path is returned by getPath.

The getPath method also returns ". Next, notice that getAbsolutePath returns an absolute path, but that this path can contain things like ".

The getCanonicalPath method, on the other hand, returns an absolute path, but it removes unnecessary parts of the path, such as ". This is shown clearly in the file1. On Windows systems, the getCanonicalPath method will also uppercase the drive letter. As an example, if we passed the following file string with a lowercase drive letter to displayInfo. Notice that getPath and getAbsolutePath return the lowercase drive letter that we entered, but getCanonicalPath returns the uppercase drive letter.

Search Tutorials:. What's the difference between a file's path, absolute path, and canonical path? Description: This Java tutorial describes a file's path, absolute path, and canonical path. Author: Deron Eriksson Description: This Java tutorial describes a file's path, absolute path, and canonical path. File; import java.