Easiest way to unpack a jar in java

Question

Basically, I have a jar file that i want to unzip to a specific folder from a junit test.

What is the easiest way to do this? I am willing to use a free third party

Answer 1

ZipInputStream in = null;
OutputStream out = null;

try {
    // Open the jar file
    String inFilename = "infile.jar";
    in = new ZipInputStream(new FileInputStream(inFilename));

    // Get the first entry
    ZipEntry entry = in.getNextEntry();

    // Open the output file
    String outFilename = "o";
    out = new FileOutputStream(outFilename);

    // Transfer bytes from the ZIP file to the output file
    byte[] buf = new byte[1024];
    int len;
    while ((len = in.read(buf)) > 0) {
        out.write(buf, 0, len);
    }
} catch (IOException e) {
    // Manage exception
} finally {
    // Close the streams
    if (out != null) {
        out.close();
    }

    if (in != null) {
        in.close();
    }
}