java ClassLoader的使用
public class Main {
public static void main(String[] args) {
URL[] urls = new URL[] {};
MyClassLoader classLoader = new MyClassLoader(urls, null);
String path = "E:/WorkSpace/MapSDKLibrary/libs/commons-codec-1.6.jar";
try {
classLoader.addJar(new File(path).toURI().toURL());
Class<?> clazz = classLoader.loadClass("org.apache.commons.codec.digest.DigestUtils");
Method md5Method = clazz.getDeclaredMethod("md5Hex",byte[].class);
Object returnValue = md5Method.invoke(null, "hello world".getBytes("utf-8"));
System.out.println("length="+returnValue.toString().length()+",result="+returnValue.toString());
classLoader.close();
/**
ClassLoader cl = new URLClassLoader(new URL[]{new File(path).toURI().toURL()});
Class<?> clazz2 = classLoader.loadClass("org.apache.commons.codec.digest.DigestUtils");
Method md5Method2 = clazz.getDeclaredMethod("md5Hex",byte[].class);
Object returnValue2 = md5Method.invoke(clazz2.newInstance(), "hello world".getBytes("utf-8"));
System.out.println("length="+returnValue2.toString().length()+",result="+returnValue2.toString());
**/
} catch (Exception e) {
e.printStackTrace();
}
}
static class MyClassLoader extends URLClassLoader {
public MyClassLoader(URL[] urls) {
super(urls);
}
public MyClassLoader(URL[] urls, ClassLoader parent) {
super(urls, parent);
}
public void addJar(URL url) {
this.addURL(url);
}
}
}
java 使用ClassLoader动态加载jar,zip文件
原文：http://my.oschina.net/ososchina/blog/352008