utilurl.java

采用tapestry的简单OA系统

package com.ejsun.entapps.util;

import java.io.File;
import java.net.URL;

/**
 * @author	Quake Wang (copy from ofbiz util lib)
 * @since	2004-4-6
 * @version $Revision: 1.1 $
 * 
 **/
public class UtilURL {

	public static URL fromClass(Class contextClass) {
		String resourceName = contextClass.getName();
		int dotIndex = resourceName.lastIndexOf('.');

		if (dotIndex != -1) resourceName = resourceName.substring(0, dotIndex);
		resourceName += ".properties";

		return fromResource(contextClass, resourceName);
	}

	public static URL fromResource(String resourceName) {
		return fromResource(resourceName, null);
	}

	public static URL fromResource(Class contextClass, String resourceName) {
		if (contextClass == null)
			return fromResource(resourceName, null);
		else
			return fromResource(resourceName, contextClass.getClassLoader());
	}

	public static URL fromResource(String resourceName, ClassLoader loader) {
		URL url = null;

		if (loader != null && url == null) url = loader.getResource(resourceName);
		if (loader != null && url == null) url = loader.getResource(resourceName + ".properties");

		if (loader == null && url == null) {
			try {
				loader = Thread.currentThread().getContextClassLoader();
			} catch (SecurityException e) {
				UtilURL utilURL = new UtilURL();

				loader = utilURL.getClass().getClassLoader();
			}
		}

		if (url == null) url = loader.getResource(resourceName);
		if (url == null) url = loader.getResource(resourceName + ".properties");

		if (url == null) url = ClassLoader.getSystemResource(resourceName);
		if (url == null) url = ClassLoader.getSystemResource(resourceName + ".properties");

		if (url == null) url = fromFilename(resourceName);

		return url;
	}

	public static URL fromFilename(String filename) {
		if (filename == null) return null;
		File file = new File(filename);
		URL url = null;

		try {
			if (file.exists()) url = file.toURL();
		} catch (java.net.MalformedURLException e) {
			e.printStackTrace();
			url = null;
		}
		return url;
	}
}