Java Jar File Load loadClassesFromJar(final String jarPath, final CharSequence matchingPath)

Description

load Classes From Jar

License

Open Source License

Declaration

static List<Class<?>> loadClassesFromJar(final String jarPath, final CharSequence matchingPath) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class Main {
    static final String CLASS_FILE_EXTENSION = ".class";

    static List<Class<?>> loadClassesFromJar(final String jarPath, final CharSequence matchingPath) {
        List<Class<?>> classes = new ArrayList<>();

        try {/*from   w w w  .  jav a2s  .  c  o m*/
            JarFile jarFile = new JarFile(jarPath);
            Enumeration<JarEntry> jarEntries = jarFile.entries();

            URLClassLoader cl = URLClassLoader.newInstance(new URL[] { new URL("jar:file:" + jarPath + "!/") });

            while (jarEntries.hasMoreElements()) {
                JarEntry jarEntry = jarEntries.nextElement();

                if (jarEntry.isDirectory() || !jarEntry.toString().contains(matchingPath)
                        || !jarEntry.getName().endsWith(CLASS_FILE_EXTENSION)) {
                    continue;
                }

                String className = jarEntry.getName().substring(0, jarEntry.getName().length() - 6).replace('/',
                        '.');
                classes.add(cl.loadClass(className));
            }
        } catch (Exception e) {
            return Collections.EMPTY_LIST;
        }

        return classes;
    }
}

Related

1. loadClassFromJar(String jarAbsolutePath, String className)
2. loadJar(File jar)
3. loadJar(String jarPath)
4. loadJar(String path)