?? classloaderutil.java
字號:
package com.opensymphony.module.sitemesh.util;import java.net.URL;import java.io.InputStream;import java.io.IOException;/** * This class is extremely useful for loading resources and classes in a fault tolerant manner * that works across different applications servers. * * It has come out of many months of frustrating use of multiple application servers at Atlassian, * please don't change things unless you're sure they're not going to break in one server or another! */public class ClassLoaderUtil { /** * Load a given resource. * * This method will try to load the resource using the following methods (in order): * <ul> * <li>From Thread.currentThread().getContextClassLoader() * <li>From ClassLoaderUtil.class.getClassLoader() * <li>callingClass.getClassLoader() * </ul> * * @param resourceName The name of the resource to load * @param callingClass The Class object of the calling object */ public static URL getResource(String resourceName, Class callingClass) { URL url = Thread.currentThread().getContextClassLoader().getResource(resourceName); if (url == null) { url = ClassLoaderUtil.class.getClassLoader().getResource(resourceName); } if (url == null) { ClassLoader cl = callingClass.getClassLoader(); if (cl != null) { url = cl.getResource(resourceName); } } if ((url == null) && (resourceName != null) && (resourceName.charAt(0) != '/')) { return getResource('/' + resourceName, callingClass); } return url; } /** * This is a convenience method to load a resource as a stream. * * The algorithm used to find the resource is given in getResource() * * @param resourceName The name of the resource to load * @param callingClass The Class object of the calling object */ public static InputStream getResourceAsStream(String resourceName, Class callingClass) { URL url = getResource(resourceName, callingClass); try { return (url != null) ? url.openStream() : null; } catch (IOException e) { return null; } } /** * Load a class with a given name. * * It will try to load the class in the following order: * <ul> * <li>From Thread.currentThread().getContextClassLoader() * <li>Using the basic Class.forName() * <li>From ClassLoaderUtil.class.getClassLoader() * <li>From the callingClass.getClassLoader() * </ul> * * @param className The name of the class to load * @param callingClass The Class object of the calling object * @throws ClassNotFoundException If the class cannot be found anywhere. */ public static Class loadClass(String className, Class callingClass) throws ClassNotFoundException { try { return Thread.currentThread().getContextClassLoader().loadClass(className); } catch (ClassNotFoundException e) { try { return Class.forName(className); } catch (ClassNotFoundException ex) { try { return ClassLoaderUtil.class.getClassLoader().loadClass(className); } catch (ClassNotFoundException exc) { return callingClass.getClassLoader().loadClass(className); } } } }}
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -