Develop Reference

Java: How to get path of a file when running JAR file

When I use relative path, I can run my Java program from Eclipse. But when I run it as a JAR file, the path doesn't work anymore. In my src/components/SettingsWindow.java I have:
ObjectInputStream ois = new ObjectInputStream(new FileInputStream("./src/files/profile.ser"));
I get a FileNotFoundException.
My file directory looks like this:
file directory
What I've tried:
String filePath = this.getClass().getResource("/files/profile.ser").toString();
String filePath = this.getClass().getResource("/files/profile.ser").getPath();
String filePath = this.getClass().getResource("/files/profile.ser").getFile().toString();
And I'd just put filePath in new FileInputStream(filePath) but none of these work and I still get a FileNotFoundException. When I System.out.println(filePath) it says: files/profile.ser
I'm trying to get the path of src/files/profile.ser while I'm in src/components/SettingsWindow.java

You can get the URL to the class:
String path =
String.join("/", getClass().getName().split(Pattern.quote(".")))
+ ".class";
URL url = getClass().getResource("/" + path);
which will either yield "file:/path/to/package/class.class" or "jar:/path/to/jar.jar!/package/class.class". You either can work with the URL or use
JarFile jar =
((JarURLConnection) url.openConnection()).getJarFile();
and use jar.getName() to get the path to parse to get your installation directory.

To get the current JAR file path I use:
public static String getJarFilePath() throws FileNotFoundException {
String path = getClass().getResource(getClass().getSimpleName() + ".class").getFile();
if(path.startsWith("/")) {
throw new FileNotFoundException("This is not a jar file: \n"+path);
}
if(path.lastIndexOf("!")!=-1) path = path.substring(path.lastIndexOf("!/")+2, path.length());
path = ClassLoader.getSystemClassLoader().getResource(path).getFile();
return path.substring(0, path.lastIndexOf('!')).replaceAll("%20", " ");
}

Needs to access csv files in src/test/resource folder

I have the requirement to read CSV file from src/test/resource folder.
I provided the file at the root level and it is working fine. But I want to put all these files in src/test/resource folder.
String fileName = "Phone_valid.csv";
File srcFile = new File(fileName);
String path = srcFile .getAbsolutePath();
// path = C:\D Drive\Orange Codebase\dabek-data-processing\Phone_valid.csv
String fileName = "\\src\\main\\resource\\Phone_invalid.csv";
File srcFile = new File(fileName);
String path = srcFile .getAbsolutePath();
// path= "C:\src\main\resource\Phone_invalid.csv"
I want that path should be
path = C:\D Drive\Orange Codebase\dabekdataprocessing\\src\main\resource\Phone_invalid.csv

Remove the first backslash. Does this work?
String fileName = "src\\main\\resource\\Phone_invalid.csv";

This should work.
File file= new File("src/test/resources/filename.txt");
Note Avoid Space in directory name like Orange Codebase

Try this code
import java.io.File;
public class MyClass {
public static void main(String[] args) {
String fileName = "src\\main\\resource\\Phone_invalid.csv";
File srcFile = new File(fileName);
String path = srcFile .getAbsolutePath();
System.out.println("Path: "+path);
}
}
Output of above code will be..
Path: E:\Orange Codebase\dabekdataprocessing\src\main\resource\Phone_invalid.csv

I achieved the same by using below code
String phonePath= "src/test/resources/Phone_valid.csv";
File srcFile = new FileSystemResource(phonePath).getFile();
String path = srcFile.getAbsolutePath();
// path = C:\D Drive\Orange Codebase\dabekdataprocessing\src\test\resources\Phone_valid.csv.
Now, I am able to access the file from src/test/resources folder.

File is not deleted when file path is generated dynamically

I am facing a problem but have not able to solve it yet. Let me share what I have done till now. I tried to delete a file using java.nio.file packages. And below is my code.
// directory will be dynamically generated.
String directory = fileDirectory+ "//" + fileName;
Path path = Paths.get(directory);
if (Files.exists(path)) {
Files.delete(path);
}
I generated the path correctly. But when Files.exists(path) calls it return false. That's why file is not deleted. But if I generated the directory string by hard-coded than it works perfectly.
// hard-coded directory works perfectly.
String directory = "C://opt//tomcat//webapps//resources//images//sprite.jpg";
I also tried the another method Files.deleteIfExists(path);. Which check the both the file existence and delete the file.
The other packages org.apache.commons.io.FileUtils and java.io.File have tried. But can't resolve the issue.
Note: My application is in spring-boot. And I read the directory from the application.properties file for both save images and delete images.
EDIT:
file uploading I mean save into the directory is perfectly worked. But file deletion does not work.
application.properties
image.root.dir=images
image.root.save.dir=C:/opt/tomcat/webapps/resources/
in implementation file
#Value("${image.root.dir}")
private String UPLOADED_FOLDER;
#Value("${image.root.save.dir}")
private String saveDir;
String directory = saveDir + UPLOADED_FOLDER + "/" + fileName;
save file into directory
String directory = saveDir + UPLOADED_FOLDER + "/";
try {
byte[] bytes = file.getBytes();
Path path = Paths.get(directory);
if (!Files.exists(path)) {
Files.createDirectories(path);
}
path = Paths.get(directory, file.getOriginalFilename());
Files.write(path, bytes);
} catch (IOException e) {
logger.error("save image into directory : " + e);
}

String directory = fileDirectory+ "//" + fileName;
This is not the correct separator used between a directory and a file name, though it seems to work as well.
This means the problem is not the separator, but a mismatch between the code that you use to generate the path and this code. You're generating the directory into somewhere else than where this is pointing.

getServletContext().getRealPath("/") omitting forward slash (/)

I'm trying to upload a file from an HTML file input.
I am using Apache Commons FileUpload and the file uploads successfully. However, when I try storing the file path in my MySQL, it is storing it without file path code:
String uploadFolder = getServletContext().getRealPath("/");
String fileName = new File(item.getName()).getName();
filePath = uploadFolder+"/"+fileName;
File uploadedFile = new File(filePath);
This is how I'm trying to store the file.
sample filepath stored
C:UsersLashDesktopworkspace3.metadata.pluginsorg.eclipse.wst.server.core mp0wtpwebappsJavaECom/download doget.txt

I have no idea what this question is about, but the correct way to do the operations your posted code is doing is as follows:
File uploadFolder = new File(getServletContext().getRealPath("/"));
String fileName = new File(item.getName()).getName(); // not sure what's going on here
File uploadedFile = new File(uploadFolder, fileName);

Get file size in Java from relative path to file

How can I get file size in Java if I have a relative path to a file such as:
String s = "/documents/19/21704/file2.pdf/0929c695-d023-49d7-a8ff-65ccea46bebc"
I tried with two diferent strings:
String[] separatedPath = s.split("/");
List<String> wordList = Arrays.asList(separatedPath);
String ret = "/" + wordList.get(1) + "/" + wordList.get(2) + "/" + wordList.get(3)+ "/" + wordList.get(4);
s = ret;
In this case s="/documents/19/21704/file2.pdf";
In second case s="/documents/19/21704/file2.pdf/0929c695-d023-49d7-a8ff-65ccea46bebc"
I tried with:
File file1 = new File(s);
long filesize = file1.length();
and with:
String filePath = new File(s).toURI().getPath();
File file2 = new File(filePath);
long filesize2 = file1.length();
and also with (if the problem is in not providing full path):
String absolutePath = FileUtil.getAbsolutePath(file1);
File file3 = new File(absolutePath);
long filesize3 = file3.length();
byte[] bytes1=FileUtil.getBytes(file1);
byte[] bytes2=FileUtil.getBytes(file2);
byte[] bytes3=FileUtil.getBytes(file3);
I am always getting in debug that filesizes in all cases are 0.
Maybe is worth noticing that the three attributes of file1 and file2 and file3 are always:
filePath: which is always null;
path: "/documents/19/21704/liferay-portlet-development.pdf"
prefixLength: 1
Since I am also using Liferay I also tried their utility.
long compId = article.getCompanyId();
long contentLength = DLStoreUtil.getFileSize(compId, CompanyConstants.SYSTEM, s);
I also should notice that in my .xhtml view I can access the file with:
<a target="_blank"
href="/documents/19/21704/file2.pdf/0929c695-d023-49d7-a8ff-65ccea46bebc">
file2.pdf
</a>
Pdf opens in a new window. So it is stored on my server.
What am I doing wrong here? That I cant get the file size from bean?
Any answer would be greatly appreciated.
What am I doing wrong here?

In Java, you can use the File.length() method to get the file size in bytes.
File file =new File("c:\\java_xml_logo.jpg");
if(file.exists()){
double bytes = file.length();
}
System.out.println("bytes : " + bytes);

The problem is that your "relative" path is expressed as an absolute path (begining with "/", which is read as FS root).
A relative file path should look like:
documents/19/21704/file2.pdf/0929c695-d023-49d7-a8ff-65ccea46bebc
./documents/19/21704/file2.pdf/0929c695-d023-49d7-a8ff-65ccea46bebc
Or, you could get your application root folder File and compose the absolute path:
File rootFolder =new File("path to your app root folder");
File myfile=new File(rootFolder, "/documents/19/21704/file2.pdf/0929c695-d023-49d7-a8ff-65ccea46bebc");