I need to know is it possible to get file via URL, convert it to lower size and save it in device's storage? I'm deploying this idea on Java Android Studio. I'll be happy for ideas and sources. Now, you need to think about how to get the data from the URL. There are many libraries that can help you with it but I would recommend RetroFit for that purpose. Finally, it depends on what type of data you are working with and what do you mean by reducing the size and then using the above-mentioned resources you can save the data.
Java HttpURLConnection to download file from an HTTP URL
Learn more. How to get file from URL and convert it and save it to the device storage? Asked 6 days ago. Active 6 days ago. Viewed 21 times. New contributor. Active Oldest Votes. UbadahJ UbadahJ 46 6 6 bronze badges.
The Overflow Blog. Podcast Programming tutorials can be a real drag. Featured on Meta. Community and Moderator guidelines for escalating issues via new response….
Worry not, in this article I'll explain the building blocks needed in order to automate downloading files for these kinds of tasks. Before you can create an application to download and create datasets for you, you'll need to know the basics required for automating file downloads via Java code.
Getting the basics right will help you use them to your own specific set of needs, whether it's for a backend server application or Android app. There are multiple ways to download a file using Java code. Here are just a few ways of how you can accomplish the task:. The most easily available and a basic package available for downloading a file from internet using Java code is the Java IO package.
Here we will be using the BufferedInputStream and the URL classes to open and read a file on a given address to a file on our local system. The reason we use the BufferedInputStream class instead of the InputStream is its buffering ability that gives our code a performance boost.
Before we dive deeper into the coding aspect let's take an overview of the classes and the individual functions we will be using in the process. The java. URL class in Java is a built-in library that offers multiple methods to access and manipulate data on the internet. In this case, we will be using the openStream function of the URL class.
The method signature for the openStream function is:. The openStream function works on an object of the URL class. The URL class opens up a connection to the given URL and the openStream method returns an input stream which is used to read data from the connection.
These classes are used for reading from a file and writing to it, respectively. The contents are read as bytes and copied to a file in the local directory using the FileOutputStream. To lower the number of lines of code we can use the Files class available from Java 7.
The Files class contains methods that read all the bytes at once and then copies it into another file. Here is how you can use it:. Java NIO is an alternative package to handle networking and input-output operations in Java. The main advantage that the Java NIO package offers is that it's non-blocking, and has channeling and buffering capabilities. When we use the Java IO library we work with streams that read data byte by byte. However, the Java NIO package uses channels and buffers. The buffering and channeling capabilities allow the system to copy contents from a URL directly into the intended file without needing to save the bytes in application memory, which would be an intermediary step.
The ability to work with channels boosts performance. The downloaded contents will be transferred to a file on the local system via the corresponding file channel. After defining the file channel we will use the transferFrom method to copy the contents read from the readChannel object to the file destination using the writeChannel object.
The transferFrom and transferTo methods are much more efficient than working with streams using a buffer. The transfer methods enable us to directly copy the contents of the file system cache to the file on the system.
Thus direct channeling restricts the number of context switches required and enhances the overall code performance.In this post, we will see how to download file from URL in java.
URL class in Java with Examples
It can be used when you want to automatically download any file from URL using java. When you run above programfile will be downloaded in above mentioned directory. You will get following output:. Save my name, email, and website in this browser for the next time I comment. Core java. BufferedInputStream. File. FileOutputStream. IOException. MalformedURLException. URL. Channels. ReadableByteChannel.
FileUtils. Downloading file from github using java file IO. Downloaded file from github using java file IO. Downloading file from github using apache common IO. Downloaded file from github using apache common IO. Downloading file from github using NIO. Downloaded file from github using NIO. Java read file line by line. Java FileWriter Example.
Java FileReader Example. Working with formulas in excel using Apache POI in java. How to set style in excel using Apache POI in java. How to read excel files in java using Apache POI. How to detect OS in java. How to get home directory in java. How to get current working directory in java. Related Posts. Add Comment Cancel reply Save my name, email, and website in this browser for the next time I comment.
BufferedInputStream ; import java.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I need to create a File object from URL object My requirement is I need to create a file object of a web image say googles logo. Something like this:. Learn more. Asked 8 years, 4 months ago. Active 2 months ago. Viewed k times. Could you elaborate?
What are you trying to achieve? Active Oldest Votes. Costi Ciudatu Costi Ciudatu A file by definition needs to be stored on some file system. You would need some in-memory file system in order to end up with a file that is not persisted. My feeling is that your requirement needs some second thought Namely, assuming you need to call a method like processImage File fthis should be changed to processImage BufferedImage img or processImage InputStream is.
Either of these changes would spare you of storing external images on the local FS. So from this point of view, the two answers are exactly the same. FileUtils FileUtils. Jan Nielsen 7, 8 8 gold badges 47 47 silver badges 90 90 bronze badges.
AdrienBe FileUtils gets an error in Eclipse, it doesn't show an import. And org. Note: add implementation 'commons-io:commons-io Asu Asu 1, 2 2 gold badges 13 13 silver badges 25 25 bronze badges. Liviu T. Arthur bauer Arthur bauer 4 4 silver badges 10 10 bronze badges. Usually moot since there is usually no query. However, to get just the file, one should use url.
Neither getFile or getPath does proper decoding, so the Paths. Oops sorry, I accidentally misread the code in your post and downvoted it because I thought it didn't match the java. URL docs. If you edit your post, I'll be able to remove my downvote. Let me know if you do this. Fixed, I was able to edit it myself and remove the downvote.Today we will learn how to download a file from URL in java.
We can use java. Here is the simple java download file from URL example program. It shows both ways to download file from URL in java. Then we are using a file output stream to read data from the input stream and write to the file. Then use the file output stream to write it to file. You can use any of these methods to download the file from URL in java program. If you are looking for performance, then do some analysis by using both methods and see what suits your need.
Hello sir, Actually I want to download. I went through this code with different URL but it throws the following exception could you please help me out with this problem. The server might be blocking it, can you try after setting the User-Agent header?
How To Read File From URL In Java?
That way, it will look like the request is coming from a browser. If I execute the same example I am getting below exception java. ConnectException: Connection timed out: connect at java. New HttpClient. Can you please tell me how to download file from dynamic URL www.
BufferedReader; import java. File; import java. FileOutputStream; import java. FileReader; import java. IOException; import java. InputStream; import java. URL; import java.
How to download file from URL in java
Your email address will not be published. I would love to connect with you personally. Pankaj I love Open Source technologies and writing about my experience about them is my passion. Follow Author. Comments mahesh says:.What is REST API? - Web Service
February 21, at pm.User interfaces and operating systems use system-dependent pathname strings to name files and directories. This class presents an abstract, system-independent view of hierarchical pathnames. The first name in an abstract pathname may be a directory name or, in the case of Microsoft Windows UNC pathnames, a hostname. Each subsequent name in an abstract pathname denotes a directory; the last name may denote either a directory or a file.
The empty abstract pathname has no prefix and an empty name sequence. The conversion of a pathname string to or from an abstract pathname is inherently system-dependent.
When an abstract pathname is converted into a pathname string, each name is separated from the next by a single copy of the default separator character. The default name-separator character is defined by the system property file. When a pathname string is converted into an abstract pathname, the names within it may be separated by the default name-separator character or by any other name-separator character that is supported by the underlying system.
A pathname, whether abstract or in string form, may be either absolute or relative. An absolute pathname is complete in that no other information is required in order to locate the file that it denotes. A relative pathname, in contrast, must be interpreted in terms of information taken from some other pathname.
By default the classes in the java. This directory is named by the system property user. The parent of an abstract pathname may be obtained by invoking the getParent method of this class and consists of the pathname's prefix and each name in the pathname's name sequence except for the last. Each directory's absolute pathname is an ancestor of any File object with an absolute abstract pathname which begins with the directory's absolute pathname.
Relative pathnames have no prefix. A relative pathname that does not specify a drive has no prefix. Instances of this class may or may not denote an actual file-system object such as a file or a directory.
If it does denote such an object then that object resides in a partition. A partition is an operating system-specific portion of storage for a file system. A single storage device e. The object, if any, will reside on the partition named by some ancestor of the absolute form of this pathname. A file system may implement restrictions to certain operations on the actual file-system object, such as reading, writing, and executing.
These restrictions are collectively known as access permissions. The file system may have multiple sets of access permissions on a single object.This tutorial will guide you to learn how to download a file from web in android java, we will first get a link to an image for downloading it, add required permissions and then pass the download link to the download manager for downloading, we will also set a path for saving the file to a location in the android device.
Just send me your project or that java file The Activity where you wish to add this code through email or google drive, i will fix your project or file and send it back to you. This site uses Akismet to reduce spam.
Learn how your comment data is processed. Skip to content. How to Download a File from URL Link in Android Java Tutorial This tutorial will guide you to learn how to download a file from web in android java, we will first get a link to an image for downloading it, add required permissions and then pass the download link to the download manager for downloading, we will also set a path for saving the file to a location in the android device.
Add these permissions in AndroidManifest. Request downloadUri ; request. Conclusion This code will not cause exceptions because exceptions are caught, so your app will not crash when executing this code If your android device runs on marshmallow, you will need request permission before executing this code. This code is just for test, you can assign this code to a button or to your desired activity. Like this: Like Loading Comments Cancel reply.