jdom 的xml / map 互轉

package com.mymhotel.opera;
import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.jdom.Attribute;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;


public class XmlUtil {
 /**
  * 取得xml文件的根節點名稱，即消息名稱。
  * 
  * @param xmlStr
  *            xml內容
  * @return String 返回名稱
  */
 public static String getRootName(String xmlStr) throws Exception {
  SAXBuilder builder = new SAXBuilder();
  Document doc = builder.build(new StringReader(xmlStr));
  Element root = doc.getRootElement();
  return root.getName();
 }

 /**
  * 把xml文件轉換爲map形式，其中key爲有值的節點名稱，並以其所有的祖先節點爲前綴，用
  * "."相連接。如：SubscribeServiceReq.Send_Address.Address_Info.DeviceType
  * 
  * @param xmlStr
  *            xml內容
  * @return Map 轉換爲map返回
  */
 public static Map<String, String> xml2Map(String xmlStr)
   throws JDOMException, IOException {
  Map<String, String> rtnMap = new HashMap<String, String>();
  SAXBuilder builder = new SAXBuilder();
  Document doc = builder.build(new StringReader(xmlStr));
  // 得到根節點
  Element root = doc.getRootElement();
  String rootName = root.getName();
  rtnMap.put("root.name", rootName);
  // 調用遞歸函數，得到所有最底層元素的名稱和值，加入map中
  convert(root, rtnMap, rootName);
  return rtnMap;
 }

 /**
  * 遞歸函數，找出最下層的節點並加入到map中，由xml2Map方法調用。
  * 
  * @param e
  *            xml節點，包括根節點
  * @param map
  *            目標map
  * @param lastname
  *            從根節點到上一級節點名稱連接的字串
  */
 public static void convert(Element e, Map<String, String> map,
   String lastname) {
  if (e.getAttributes().size() > 0) {
   Iterator it_attr = e.getAttributes().iterator();
   while (it_attr.hasNext()) {
    Attribute attribute = (Attribute) it_attr.next();
    String attrname = attribute.getName();
    String attrvalue = e.getAttributeValue(attrname);
    //map.put( attrname, attrvalue);
    map.put(lastname + "." + attrname, attrvalue); //key 根據根節點 進行生成
   }
  }
  List children = e.getChildren();
  Iterator it = children.iterator();
  while (it.hasNext()) {
   Element child = (Element) it.next();
   /*String name = lastname + "." + child.getName();*/
   String name = child.getName();
   // 如果有子節點，則遞歸調用
   if (child.getChildren().size() > 0) {
    convert(child, map,  lastname + "." + child.getName());
   } else {
    // 如果沒有子節點，則把值加入map
    map.put(name, child.getText());
    // 如果該節點有屬性，則把所有的屬性值也加入map
    if (child.getAttributes().size() > 0) {
     Iterator attr = child.getAttributes().iterator();
     while (attr.hasNext()) {
      Attribute attribute = (Attribute) attr.next();
      String attrname = attribute.getName();
      String attrvalue = child.getAttributeValue(attrname);
      map.put(lastname + "." + child.getName() + "." + attrname, attrvalue);
      //map.put( attrname, attrvalue);
     }
    }
   }
  }
 }

 /**
  * 把xml文件轉換爲list形式，其中每個元素是一個map，map中的key爲有值的節點名稱，並以其所有的祖先節點爲前綴，用
  * "."相連接。如：SubscribeServiceReq.Send_Address.Address_Info.DeviceType
  * 
  * @param xmlStr
  *            xml內容
  * @return Map 轉換爲map返回
  */
 public static List<Map<String, String>> xml2List(String xmlStr)
   throws JDOMException, IOException {
  List<Map<String, String>> rtnList = new ArrayList<Map<String, String>>();
  Map<String, String> rtnMap = new HashMap<String, String>();
  SAXBuilder builder = new SAXBuilder();
  Document doc = builder.build(new StringReader(xmlStr));
  // 得到根節點
  Element root = doc.getRootElement();
  String rootName = root.getName();
  rtnMap.put("root.name", rootName);
  // 調用遞歸函數，得到所有最底層元素的名稱和值，加入map中
  convert2List(root, rtnMap, rootName, rtnList);
  if (rtnList.size() == 0)
   rtnList.add(rtnMap);
  return rtnList;
 }

 /**
  * 遞歸函數，找出最下層的節點並加入到map中，如果有相同的節點，則加入list中， 由xml2List方法調用。
  * 
  * @param e
  *            xml節點，包括根節點
  * @param map
  *            目標map
  * @param lastname
  *            從根節點到上一級節點名稱連接的字串
  * @param list
  *            相同節點生成map放入list中
  */
 public static void convert2List(Element e, Map<String, String> map,
   String lastname, List<Map<String, String>> list) {
  if (e.getAttributes().size() > 0) {
   Iterator it_attr = e.getAttributes().iterator();
   while (it_attr.hasNext()) {
    Attribute attribute = (Attribute) it_attr.next();
    String attrname = attribute.getName();
    String attrvalue = e.getAttributeValue(attrname);
    map.put(attrname, attrvalue);
   }
  }
  List children = e.getChildren();
  Iterator it = children.iterator();
  while (it.hasNext()) {
   Element child = (Element) it.next();
   String name = lastname + "." + child.getName();
   // 如果有子節點，則遞歸調用
   if (child.getChildren().size() > 0) {
    convert(child, map, name);
   } else {
    // 如果沒有子節點，則把值加入map
    map.put(name, child.getText());
    // 如果該節點有屬性，則把所有的屬性值也加入map
    if (child.getAttributes().size() > 0) {
     Iterator attr = child.getAttributes().iterator();
     while (attr.hasNext()) {
      Attribute attribute = (Attribute) attr.next();
      String attrname = attribute.getName();
      String attrvalue = child.getAttributeValue(attrname);
      map.put(name + "." + attrname, attrvalue);
     }
    }
   }
   // 如果有相同節點，則加入list中，不考慮子節點中又有相同節點的情況
   if (e.getChildren(child.getName()).size() > 1) {
    Map<String, String> aMap = new HashMap<String, String>();
    aMap.putAll(map);
    list.add(aMap);
    map = new HashMap<String, String>();
    map.put("root.name", aMap.get("root.name"));
   }
  }
 }

 /**
  * 打印map 的所有key和value
  * 
  * @param map
  */
 public static void printMap(Map<String, String> map) {
  Iterator<String> keys = map.keySet().iterator();
  while (keys.hasNext()) {
   String key = keys.next();
   System.out.println(key + ":" + map.get(key));
  }
 }

 /**
  * 格式化xml
  * 
  * @param xmlStr
  * @param encode
  * @return String
  * @date Apr 30, 2008
  *//*
 @SuppressWarnings("deprecation")
 public static String formatXml(String xmlStr, String encode) {

  SAXBuilder sb = new SAXBuilder();
  Reader reader = new StringReader(xmlStr);

  Document doc = null;
  try {
   doc = sb.build(reader);
  } catch (Exception e) {
   // do nosth
  }

  XMLOutputter outputter = new XMLOutputter(Format.getPrettyFormat());
  outputter.setEncoding(encode);
  String result = "";
  if (null != doc) {
   result = outputter.outputString(doc);
  }

  return result;
 }*/
}