instance.java

ext2+spring+hibernate+dwr做的小系统

package com.newsoft.util;

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

/**
 * <p>Company: newsoft</p>
 * @author davi
 * @version 1.0
*/
public class Instance {

	//返回业务对象实例
	public static Object create(String className){
	    Class clazz = null;
		try {
			if(className.indexOf("ComboboxUtils") >= 0){
				clazz = Class.forName("com.newsoft.util." + className);
			}
			else{
				clazz = Class.forName(getClassPath(className));
			}
			//System.err.println("clazz:"+clazz);
			return clazz.newInstance();
		}
		catch (ClassNotFoundException e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		}
		catch (InstantiationException e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		}
		catch (IllegalAccessException e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		}		
		return null;
	}
	
	//从dwr配置文件中读取业务对象路径
	public static String getClassPath(String className){
		String configFileName = Path.getFullPathRelateClass("../../../..", Instance.class)+"/dwr.xml";
		Document doc = getXml(configFileName);
		String value = null;
		Element firstEl = (Element) doc.getElementsByTagName("allow").item(0);
		NodeList list = firstEl.getElementsByTagName("create");
		for(int i=0; i<list.getLength(); i++){
			Element el = (Element) list.item(i);
			String attribute = el.getAttribute("javascript");
			if(attribute.indexOf(className) == 0 && attribute.length() == className.length()){
				value = el.getAttribute("class");
				break;
			}
		}
		return value;
	}
		
	private static Document getXml(String configFileName){
		try{
			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
			DocumentBuilder builder = factory.newDocumentBuilder();
			Document doc = builder.parse(configFileName);
			doc.normalize();
			return doc;
		}
		catch(Exception e){
			System.err.println("读取配置文件错误:"+e.toString());
			System.err.println("文件路径:"+configFileName);
		}
		return null;
	}

	/**
	 * @param args
	 * @throws Exception 
	 */
	public static void main(String[] args) {

	}
}