get_jars.java (dump classpath from manifest)

get_jars.java

package com.company;

import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;
import java.util.jar.Attributes;
import java.util.jar.Manifest;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class Main {

    public static void main(String[] args) throws IOException {
        Stream<Path> walk = Files.walk(Paths.get("/home/peterjson/Desktop/libs/"));

        List<String> result = walk.map(x -> x.toString()).filter(f -> f.endsWith(".jar")).collect(Collectors.toList());

        for (String path : result) {
            try{
                URL entryUrl = new URL("jar:file:" + path + "!/META-INF/MANIFEST.MF");
                InputStream is = entryUrl.openStream();
                Manifest manifest = new Manifest(is);
                Attributes mainAttributes = manifest.getMainAttributes();
                String classpath = mainAttributes.getValue("Class-Path");
                if(classpath != null) {
                    classpath = classpath.replace("../", "").replace("..\\", "").replace("./", "").replace(".\\", "");
                    if(classpath.contains(" ")){
                        String [] arr = classpath.split(" ");
                        for(String p: arr){
                            if(p.contains("/"))
                                System.out.println(p.substring(p.lastIndexOf("/")+1));
                            else if(p.contains("\\"))
                                System.out.println(p.substring(p.lastIndexOf("\\")+1));
                            else
                                System.out.println(p);
                        }
                    }
                    else{
                        if(classpath.contains("/"))
                            System.out.println(classpath.substring(classpath.lastIndexOf("/")+1));
                        else if(classpath.contains("/"))
                            System.out.println(classpath.substring(classpath.lastIndexOf("\\")+1));
                        else
                            System.out.println(classpath);
                    }
                }
            } catch (MalformedURLException ex) {
                ex.printStackTrace();
            } catch (FileNotFoundException ex) {
                continue;
            }

        }

    }
}