How to Extract JAR File Contents into a Specified Directory?

Extracting JAR File Contents into a Specified Directory

Problem:

You have a JAR file and need to extract its contents into a specific directory. Running the "jar -xf filename.jar" command returns an error.

Solution:

Using an Existing Example:

• Refer to this guide on extracting Java resources from JAR and ZIP archives: https://examples.javacodegeeks.com/core-java/java-util-jar-extract-resources-from-jar-and-zip-archive-example/.

Custom Code:

Alternatively, use the following code:

<code class="java">// JAR file to extract
java.util.jar.JarFile jar = new java.util.jar.JarFile(jarFile);

// Extract all entries
java.util.Enumeration enumEntries = jar.entries();
while (enumEntries.hasMoreElements()) {
    // Get the entry
    java.util.jar.JarEntry file = (java.util.jar.JarEntry) enumEntries.nextElement();

    // Create a file object
    java.io.File f = new java.io.File(destDir + java.io.File.separator + file.getName());

    // If the entry is a directory, create it
    if (file.isDirectory()) {
        f.mkdir();
        continue;
    }

    // Otherwise, extract the file
    java.io.InputStream is = jar.getInputStream(file); // Input stream
    java.io.FileOutputStream fos = new java.io.FileOutputStream(f); // Output stream

    // Write the file contents
    while (is.available() > 0) {
        fos.write(is.read());
    }

    // Close streams
    fos.close();
    is.close();
}

// Close the JAR file
jar.close();</code>

Source: http://www.devx.com/tips/Tip/22124

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