java读取资源文件。tomcat路径问题

hibernate代码copy过来
package cn.isvi.util;

import java.io.InputStream;



public class ResourceReader {

	public static InputStream getResourceAsStream(String resource) {
		String stripped = resource.startsWith("/") ?
				resource.substring(1) : resource;

		InputStream stream = null;
		ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
		if (classLoader!=null) {
			stream = classLoader.getResourceAsStream( stripped );
		}
		if ( stream == null ) {
			stream = ResourceReader.class.getResourceAsStream( resource );
		}
		if ( stream == null ) {
			stream = ResourceReader.class.getClassLoader().getResourceAsStream( stripped );
		}
		if ( stream == null ) {
			throw new RuntimeException( resource + " not found" );
		}
		return stream;
	}
}