Java ClassPath Add addDirToClasspath(File directory)

Description

Adds the jars in the given directory to classpath

License

Open Source License

Parameter

Parameter	Description
directory	a parameter

Exception

Parameter	Description
IOException	an exception

Declaration

public static void addDirToClasspath(File directory) throws IOException 

Method Source Code

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

import java.io.File;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;

public class Main {
    private static final Class[] parameters = new Class[] { URL.class };

    /**/*from  w ww  . j  ava 2 s . c om*/
     * Adds the jars in the given directory to classpath
     * @param directory
     * @throws IOException
     */
    public static void addDirToClasspath(File directory) throws IOException {
        if (directory.exists()) {
            File[] files = directory.listFiles();
            for (File file : files) {
                addURL(file.toURI().toURL());
            }
        }
    }

    /**
     * Add URL to CLASSPATH
     * @param u URL
     * @throws IOException IOException
     */
    public static void addURL(URL u) throws IOException {
        URLClassLoader sysLoader = (URLClassLoader) ClassLoader.getSystemClassLoader();
        URL urls[] = sysLoader.getURLs();

        for (URL url : urls) {
            if (url.toString().equalsIgnoreCase(u.toString())) {
                //URL is already in the CLASSPATH
                return;
            }
        }

        Class sysclass = URLClassLoader.class;

        try {
            Method method = sysclass.getDeclaredMethod("addURL", parameters);
            method.setAccessible(true);
            method.invoke(sysLoader, new Object[] { u });
        } catch (NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException
                | InvocationTargetException t) {
            System.out.println("URL error : " + t.getMessage());
            throw new IOException("Error, could not add URL to system classloader");
        }
    }
}

Related

1. addClasspath(String path)
2. addClassPath2ClassLoader(ClassLoader cl, String path)
3. addClasspathEntries(Collection cpEntries)
4. addClassPathItems(String[] cpItems)
5. addDirToClasspath(File directory)
6. addPathToClassPath(String s)
7. addToClasspath(File f)
8. addToClassPath(File file)
9. addToClasspath(File file)