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Tag: file-io
Converting MultipartFile to java.io.File without copying to local machine
I have a Java Spring MVC web application. From client, through AngularJS, I am uploading a file and posting it to Controller as webservice. In my Controller, I am gettinfg it as MultipartFile and I can copy it to local machine. But I want to upload the file to Amazone S3 bucket. So I have to convert it to jav…
java.io.FileNotFoundException: the system cannot find the file specified
I have a file named “word.txt”. It is in the same directory as my java file. But when I try to access it in the following code this file not found error occurs: Here’s my code: Answer Put the word.txt directly as a child of the project root folder and a peer of src Disclaimer: I’d like…
Java read file and store text in an array
I know how to read a file with Java using Scanner and File IOException, but the only thing I don’t know is how to store the text in the files as an array. Here is a snippet of my code: Here is what my KeyWestTemp.txt file contains: Answer Stored as strings: For floats:
BufferInputStream vs ByteArrayInputStream
Here are three ways to read an entire file into memory before processing it: Approach A: Approach B: Approach C: Why would I prefer one approach over another? Are there any specific use-cases that call for one approach over another? Why not use a fixed-length byte[] instead? Answer Unless you need anything sp…
Changing the directory path’s forward slash to backslash
I’m using the JFile chooser, and trying to import a pdf file but; System.out.println(filelist); perfectly prints the desired outcome with forward slashes; C:/Users/raz/Documents/2pg.pdf but the doc gives an error with backslashes; java.io.FileNotFoundException: C:UsersrazDocuments2pg.pdf (The filename, …
Unwanted double quotes in generated CSV file
I have created a CSV file using the Java code below: I am getting the CSV file, but the content of the file has unwanted double quotes. Eg. “ABC”,”123″,”KDNJ” I don’t get from where these double quotes are added. Answer This worked for me See the CSVWriter javadoc
How to recursively scan directories in Android
How can I recursively scan directories in Android and display file name(s)? I’m trying to scan, but it’s slow (force close or wait). I’m using the FileWalker class given in a separate answer to this question. Answer You should almost always access the file system only from a non-UI thread. O…
How to write an S3 object to a file?
What’s the fastest way to write an S3 object (of which I have the key) to a file? I’m using Java. Answer While IOUtils.copy() and IOUtils.copyLarge() are great, I would prefer the old school way of looping through the inputstream until the inputstream returns -1. Why? I used IOUtils.copy() before …
Most efficient way to check if a file is empty in Java on Windows
I am trying to check if a log file is empty (meaning no errors) or not, in Java, on Windows. I have tried using 2 methods so far. Method 1 (Failure) Method 2 (Failure) Now both these methods fail at times when the log file is empty (has no content), yet the file size is not zero (2 bytes). What