Mega Code Archive
Load a resource as a stream
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import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
//Revised from apache cxf
public class Main {
/**
* Load a given resource. <p/> 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 && resourceName.startsWith("/")) {
//certain classloaders need it without the leading /
url = Thread.currentThread().getContextClassLoader()
.getResource(resourceName.substring(1));
}
ClassLoader cluClassloader = Main.class.getClassLoader();
if (cluClassloader == null) {
cluClassloader = ClassLoader.getSystemClassLoader();
}
if (url == null) {
url = cluClassloader.getResource(resourceName);
}
if (url == null && resourceName.startsWith("/")) {
//certain classloaders need it without the leading /
url = cluClassloader.getResource(resourceName.substring(1));
}
if (url == null) {
ClassLoader cl = callingClass.getClassLoader();
if (cl != null) {
url = cl.getResource(resourceName);
}
}
if (url == null) {
url = callingClass.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. <p/> 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 given resources. <p/> This method will try to load the resources
* 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 List<URL> getResources(String resourceName, Class callingClass) {
List<URL> ret = new ArrayList<URL>();
Enumeration<URL> urls = new Enumeration<URL>() {
public boolean hasMoreElements() {
return false;
}
public URL nextElement() {
return null;
}
};
try {
urls = Thread.currentThread().getContextClassLoader()
.getResources(resourceName);
} catch (IOException e) {
//ignore
}
if (!urls.hasMoreElements() && resourceName.startsWith("/")) {
//certain classloaders need it without the leading /
try {
urls = Thread.currentThread().getContextClassLoader()
.getResources(resourceName.substring(1));
} catch (IOException e) {
// ignore
}
}
ClassLoader cluClassloader = Main.class.getClassLoader();
if (cluClassloader == null) {
cluClassloader = ClassLoader.getSystemClassLoader();
}
if (!urls.hasMoreElements()) {
try {
urls = cluClassloader.getResources(resourceName);
} catch (IOException e) {
// ignore
}
}
if (!urls.hasMoreElements() && resourceName.startsWith("/")) {
//certain classloaders need it without the leading /
try {
urls = cluClassloader.getResources(resourceName.substring(1));
} catch (IOException e) {
// ignore
}
}
if (!urls.hasMoreElements()) {
ClassLoader cl = callingClass.getClassLoader();
if (cl != null) {
try {
urls = cl.getResources(resourceName);
} catch (IOException e) {
// ignore
}
}
}
if (!urls.hasMoreElements()) {
URL url = callingClass.getResource(resourceName);
if (url != null) {
ret.add(url);
}
}
while (urls.hasMoreElements()) {
ret.add(urls.nextElement());
}
if (ret.isEmpty() && (resourceName != null) && (resourceName.charAt(0) != '/')) {
return getResources('/' + resourceName, callingClass);
}
return ret;
}
}
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