java解析xml 工具类

解析xml 工具 做个笔记

import java.io.FileInputStream;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;
import org.jdom.Attribute;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;

public class XmlUtil {
	private static Logger log = Logger.getLogger(XmlUtil.class);
	
	public final static String DEFAULT_ID_KEY = "defalut";
	
	public final static String ID = "id";
	
	/**
	 * 初始化 filePath 指定的 XML 文件
	 * 
	 * @param filePath
	 * @return
	 * @throws Exception
	 */
	public static Map<String,Map<String,String>> loadXml(String filePath) throws Exception {
		return loadXml(new FileInputStream(filePath));
	}
	
	/**
	 * 初始化 InputStream 指定的 XML 输入流
	 * 
	 * @param in
	 * @return
	 * @throws Exception
	 */
	public static Map<String,Map<String,String>> loadXml(InputStream in) throws Exception {
		Map<String,Map<String,String>> configMap = new HashMap<String,Map<String,String>>();
		try {
			SAXBuilder sb = new SAXBuilder();
			Document doc = sb.build(in);
			Element root = doc.getRootElement();
			List rootList = root.getChildren();
			for (int i = 0; i < rootList.size(); i++) {
				Element rootEle = (Element) rootList.get(i);
				List childList = rootEle.getChildren();
				if (childList != null && childList.size() > 0) {
					Attribute attribute = rootEle.getAttribute(ID);
					String idValue = null;
					if (attribute == null) {
						idValue = DEFAULT_ID_KEY;
					} else {
						idValue = attribute.getValue();
					}
					if (idValue == null || "".equals(idValue)) {
						idValue = DEFAULT_ID_KEY;
					}
					Map<String,String> itemMap = null;
					if (configMap.containsKey(idValue)) { // 如果已经存在 Map
						itemMap = configMap.get(idValue);
					} else { // 如果不存在就新建
						itemMap = new HashMap<String,String>();
						configMap.put(idValue, itemMap);
					}
					for (int j = 0; j < childList.size(); j++) {
						Element childEle = (Element) childList.get(j);
						Attribute childAttribute = childEle.getAttribute(ID);						
						String idKey = null;
						if (childAttribute == null) {
							idKey = DEFAULT_ID_KEY;
						} else {
							idKey = childAttribute.getValue();
						}
						itemMap.put(idKey, childEle.getText());
					}
					
					
				}
			}
			log.info("初始化 XML 配置文件成功");
		} catch (Exception ex) {
			log.error("初始化 XML 配置文件失败，原因：" + ex);
			throw ex;
		}
		return configMap;
	}
}