How to get a path to a resource in a Java JAR file

How to get a path to a resource in a Java JAR file

To get the path to a resource within a Java JAR (Java Archive) file, you can use the ClassLoader or Class methods provided by Java. Here's how you can do it:

Suppose you have a JAR file named myjar.jar, and you want to retrieve the path to a resource named myresource.txt within the JAR.

Option 1: Using ClassLoader

ClassLoader classLoader = getClass().getClassLoader();
URL resourceUrl = classLoader.getResource("myresource.txt");

if (resourceUrl != null) {
    String resourcePath = resourceUrl.getPath();
    System.out.println("Resource path: " + resourcePath);
} else {
    System.out.println("Resource not found.");
}

In this code:

  • getClass().getClassLoader() gets the ClassLoader associated with the current class.
  • classLoader.getResource("myresource.txt") retrieves the URL of the resource named myresource.txt within the classpath, which includes resources within JAR files.

Option 2: Using Class

URL resourceUrl = getClass().getResource("/myresource.txt");

if (resourceUrl != null) {
    String resourcePath = resourceUrl.getPath();
    System.out.println("Resource path: " + resourcePath);
} else {
    System.out.println("Resource not found.");
}

In this code:

  • getClass().getResource("/myresource.txt") retrieves the URL of the resource named myresource.txt using the class's location in the classpath.

Note:

  • Use a leading / when specifying the resource path to indicate that you're looking for an absolute path within the JAR file.
  • The getResource methods return null if the specified resource is not found.

After retrieving the URL of the resource, you can use the getPath() method to obtain its path as a string. This path will include the path within the JAR file.

Keep in mind that the path retrieved using these methods will be in a URL format, which may use forward slashes (/) as the path separator, even on Windows. You may need to convert it to the appropriate format if you plan to use it as a file path in your code.

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