ClassLoader 学习 - MyURLClassLoader

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用户可以通过 URLClassLoader 动态载入一个Class文件或者 jar 包

package com.humpic.framework.classloader;

import java.io.File;
import java.io.IOException;
import java.net.*;

/**
* 自定义 ClassLoader
*
* @since 2007-11-13
* @author Chen Guoqiang
*/
public class MyURLClassLoader extends URLClassLoader {

    public MyURLClassLoader() {
        super(new URL[0], ClassLoader.getSystemClassLoader());
    }

    public void addFiles(String[] files) {
        if (files == null || files.length <= 0) {
            return;
        }

        for (int i = 0; i < files.length; i++) {
            if (files[i] != null && files[i].length() > 0) {
                addFile(files[i]);
            }
        }
    }

    public void addFiles(File[] files) {
        if (files == null || files.length <= 0) {
            return;
        }

        for (int i = 0; i < files.length; i++) {
            addFile(files[i]);
        }
    }

    public void addURLs(URL[] urls) {
        if (urls == null || urls.length <= 0) {
            return;
        }

        for (int i = 0; i < urls.length; i++) {
            addURL(urls[i]);
        }
    }

    public void addFile(String file) {
        try {
            addFile(new File(file).getCanonicalFile());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public void addFile(File file) {
        try {
            addURL(file.toURL());
        } catch (MalformedURLException e) {
            throw new RuntimeException(e);
        }
    }

    public void addURL(URL url) {
        System.out.println(url);
        super.addURL(url);
    }
}