JarFile from inside a *.jar or inputstream to file?

Question

I have a jar or war.

I\'m programmaticaly reading this jar, and when I find jar inside this jar I\'d like to programmaticaly read it again.

But JarFile prov

Answer 1

Recursively use the JarFile again to read the new jar file. For ex.,

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;


public class JarReader {

public static void readJar(String jarName) throws IOException {
    String dir = new File(jarName).getParent();
    JarFile jf = new JarFile(jarName);
    Enumeration en = jf.entries();
    while(en.hasMoreElements()) { 
        ZipEntry ze = (ZipEntry)en.nextElement();
        if(ze.getName().endsWith(".jar")) { 
            readJar(dir + System.getProperty("file.separator") + ze.getName());
        } else {
            InputStream is = jf.getInputStream(ze);
            // ... read from input stream
            is.close();
            System.out.println("Processed class: " + ze.getName());
        }   
    }
}

public static void main(String[] args) throws IOException {
    readJar(args[0]);
}

}