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.Method;
import java.net.URL;
import java.net.URLClassLoader;

public class Main {
    /**/*from w  ww  .ja  v  a2s .  c o  m*/
     * Adds the jars in the given directory to classpath
     * 
     * @param directory
     * @throws IOException
     */
    public static void addDirToClasspath(File directory) throws IOException {

        // Iterate over files and add to classpath
        for (File file : directory.listFiles()) {
            addURL(file.toURI().toURL());
        }
    }

    /**
     * Add URL to CLASSPATH
     * 
     * @param URL
     * @throws IOException
     */
    public static void addURL(URL newURL) throws IOException {

        // Get system class loader
        URLClassLoader sysLoader = (URLClassLoader) ClassLoader.getSystemClassLoader();

        // Test the newURL is not alread loaded
        for (URL url : sysLoader.getURLs()) {

            // compare URL
            if (url.toString().equalsIgnoreCase(newURL.toString())) {

                // already loaded
                System.out.println("URL " + newURL + " is already in the CLASSPATH");
                return;
            }
        }

        // load newURL
        Class<URLClassLoader> sysclass = URLClassLoader.class;
        try {

            // In
            Method method = sysclass.getDeclaredMethod("addURL", new Class[] { URL.class });
            method.setAccessible(true);
            method.invoke(sysLoader, new Object[] { newURL });

        } catch (Throwable t) {
            t.printStackTrace();

            throw new IOException("Error, could not add URL to system classloader");
        }
    }
}

Related

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