ConfigUtil.java

package com.co.lane.util;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.dom4j.Document;
import org.dom4j.Element;

/**
 * 配置文件内部元素值获取
 */
public class ConfigUtil {

	/**
	 * private Document
	 */
	private Document doc = null;

	/**
	 * private constructor
	 */
	public ConfigUtil() {
	}

	/**
	 * 取得配置文件中的节点，如下文件跟节点root<br>
	 * <pre>
	 * <root>
	 *   <item>
	 *     <Id>H000001</Id>
	 *     <Title>node1</Title>
	 *     <Type>DB</Type>
	 *     <Field>DBVal</Field>
	 *     <Height>10</Height>
	 *   </item>
	 *   <item>
	 *     <Id>H000002</Id>
	 *     <Title>node2</Title>
	 *     <Type>DB</Type>
	 *     <Field>DBVal</Field>
	 *     <Height>100</Height>
	 *   </item>
	 * </root>
	 * if xpathExpression is [/call/item], return [{Id=H000001,Title=node1,...}, {Id=H000002,Title=node2,...}]
	 * </pre>
	 * 
	 * @param xpathExpression
	 * @return 
	 * <code>
	 * 	List<Map<String,String>> Object instance
	 * <code>
	 */
	@SuppressWarnings("unchecked")
	public List<Map<String,String>> getListByXPath(String xpathExpression) {
		List<Map<String,String>> list = new ArrayList<Map<String,String>>();
		List<?> listNodes = doc.selectNodes(xpathExpression);
		Iterator<?> iterator = listNodes.iterator();
		while(iterator.hasNext()){
			Element item = (Element)iterator.next();
			List<Element> listSubItem = item.elements();
			Map<String,String> map = new HashMap<String, String>();
			// 设置对象属性值
			for(Element e : listSubItem){
				map.put(e.getName(), e.getText());
			}
			list.add(map);
		}
		return list;
	}

	/**
	 * 取得配置文件中的节点，如下文件跟节点root<br>
	 * <pre>
	 * <root>
	 *   <item>
	 *     <Id>H000001</Id>
	 *     <Title>node1</Title>
	 *     <Type>DB</Type>
	 *     <Field>DBVal</Field>
	 *     <Height>10</Height>
	 *   </item>
	 *   <item>
	 *     <Id>H000002</Id>
	 *     <Title>node2</Title>
	 *     <Type>DB</Type>
	 *     <Field>DBVal</Field>
	 *     <Height>100</Height>
	 *   </item>
	 * </root>
	 * if xpathExpression is [/call/item], return [{Id=H000001,Title=node1,...}, {Id=H000002,Title=node2,...}]
	 * </pre>
	 * 
	 * @param clazzT 泛型对象
	 * @param xpathExpression
	 * @return 
	 * <code>
	 * 	List<T> Object instance
	 * <code>
	 */
	@SuppressWarnings("unchecked")
	public <T> List<T> getListByXPath(Class<T> clazzT, String xpathExpression) {
		// 反射对象
		List<T> list = new ArrayList<T>();
		ReflectUtil reflect = ReflectUtil.forClass(clazzT);
		
		// 节点处理
		List<?> listNodes = doc.selectNodes(xpathExpression);
		Iterator<?> iterator = listNodes.iterator();
		String text = "";
		while(iterator.hasNext()){
			Element item = (Element)iterator.next();
			List<Element> listSubItem = item.elements();
			try {
				// 实例化对象
				T instance = clazzT.newInstance();
				for(Element e : listSubItem){
					// 设置对象属性值
					text = StringUtil.escapeCharacter(e.getText());
					reflect.setSetMethodValue(instance, e.getName().toLowerCase(), text);
				}
				list.add(instance);
			} catch (Exception e) {
				e.printStackTrace();
				throw new RuntimeException(e.getMessage());
			}
		}
		return list;
	}
	// =========================SETTER GETTER==================================
	
	/**
	 * @return the doc
	 */
	public Document getDoc() {
		return doc;
	}

	/**
	 * @param doc
	 *            the doc to set
	 */
	public void setDoc(Document doc) {
		this.doc = doc;
	}

}