XML工具代码:SAX从String字符串XML内获取指定节点或属性的值

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有如下的XML字符串：

<?xml version="1.0" encoding="UTF-8"?><?Label SINFON|RATE|328|SUCCESS ?><RateHeader xmlns="rate.fidelio.2.0" rateStatus="ACTIVE" yieldStatus="NONE">  <hotelCode>SINFON</hotelCode>  <chainCode>COL</chainCode>  <rateClass/>  <RateCategory>    <catDescription>Rack rates</catDescription>    <category>RAK</category>  </RateCategory>  <rateCode>WHL01</rateCode>  <startSell>2013-12-02</startSell>  <endSell>2015-01-22</endSell>  <advancedBookingDays>2</advancedBookingDays>  <displayText>Tour Series</displayText>  <folioText>Room Charge</folioText>  <shortInfo>tour series/min. 5 tours</shortInfo>  <minLos>3</minLos>  <maxLos>20</maxLos>  <rhythm>W</rhythm>  <packages>BRF</packages>  <packages>IBF</packages>  <marketCode>RAC</marketCode>  <sourceCode>COL</sourceCode>  <commission>0</commission>  <foreignCurrencyDepartmentCode/>  <departmentCode>100</departmentCode>  <weekendDepartmentCode>100</weekendDepartmentCode>  <rateBucket>LOW</rateBucket></RateHeader>

要求从中读取rateCode节点的值，实现方法如下：

 public static String getRateCodeFromXmlString(String xmlString) {   String rateCodeMessage="";        StringReader read = new StringReader(xmlString);          //创建新的输入源SAX 解析器将使用 InputSource 对象来确定如何读取 XML 输入          InputSource source = new InputSource(read);          //创建一个新的SAXBuilder          SAXBuilder saxbBuilder = new SAXBuilder();          try         {              //通过输入源构造一个Document              Document doc = saxbBuilder.build(source);                          //取的根元素              Element root = doc.getRootElement();                         List<?> node = root.getChildren();                     for (int i = 0; i < node.size();i++)             {                Element element=(Element)node.get(i);               if(element.getName().equals("rateCode")){                 rateCodeMessage=element.getText();               }                            }                         return rateCodeMessage;         }         catch         (JDOMException e) {              e.printStackTrace();             return "";        } catch (IOException e) {              e.printStackTrace();              return "";        }   }

有如下XML字符串：

<?xml version="1.0" encoding="UTF-8"?><?Label EXPSD|RTAV|10000281|SUCCESS?><RtavMessage xmlns="rtav.fidelio.1.0">  <HotelReference hotelCode="EXPSD"/>  <DailyInventories>    <DailyInventory datum="2014-08-10">      <RoomTypeInventories>        <RoomTypeInventory roomType="1KESS" generic="0" physicalRooms="22" roomTypeOverbook="0" outOfOrder="6">          <Tentative count="0" blockCount="0" resvCount="0"/>          <Definite count="6" blockCount="0" resvCount="6"/>        </RoomTypeInventory>        <RoomTypeInventory roomType="1KSTS" generic="0" physicalRooms="81" roomTypeOverbook="0" outOfOrder="16">          <Tentative count="0" blockCount="0" resvCount="0"/>          <Definite count="14" blockCount="0" resvCount="14"/>        </RoomTypeInventory>        <RoomTypeInventory roomType="2BSVS" generic="0" physicalRooms="34" roomTypeOverbook="0" outOfOrder="6">          <Tentative count="0" blockCount="0" resvCount="0"/>          <Definite count="12" blockCount="0" resvCount="12"/>        </RoomTypeInventory>      </RoomTypeInventories>    </DailyInventory>    <DailyInventory datum="2014-08-11">      <RoomTypeInventories>        <RoomTypeInventory roomType="1KSTS" generic="0" physicalRooms="81" roomTypeOverbook="0" outOfOrder="16">          <Tentative count="0" blockCount="0" resvCount="0"/>          <Definite count="14" blockCount="1" resvCount="13"/>        </RoomTypeInventory>      </RoomTypeInventories>    </DailyInventory>  </DailyInventories></RtavMessage>

要求获取roomType属性的值，如果有多个，则以空格间隔，不获取重复的值。实现代码如下：

 public static String getRoomTypeFromXmlString(String xmlString) {   String roomTypeMessage="";        StringReader read = new StringReader(xmlString);          //创建新的输入源SAX 解析器将使用 InputSource 对象来确定如何读取 XML 输入          InputSource source = new InputSource(read);          //创建一个新的SAXBuilder          SAXBuilder saxbBuilder = new SAXBuilder();          try         {              //通过输入源构造一个Document              Document doc = saxbBuilder.build(source);                          //取的根元素              Element root = doc.getRootElement();                         List<?> node = root.getChildren();                     for (int i = 0; i < node.size();i++)             {                            Element element=(Element)node.get(i);                               List<?> subNode = element.getChildren();                                  for(int j=0;j<subNode.size();j++)                {                    Element subElement=(Element)subNode.get(j);                    List<?> subNode2 = subElement.getChildren();                                       for(int k=0;k<subNode2.size();k++)                    {                    Element subElement2=(Element)subNode2.get(k);                    List<?> subNode3 = subElement2.getChildren();                                        for(int m=0;m<subNode3.size();m++)                    {                    Element subElement3=(Element)subNode3.get(m);                    String temp=subElement3.getAttributeValue("roomType");                      String temp2=roomTypeMessage.indexOf(temp)>=0?"":(temp+" ");                                  roomTypeMessage+=temp2;                    }                    }                        }                     }                  return roomTypeMessage;         }         catch         (JDOMException e) {              e.printStackTrace();             return "";        } catch (IOException e) {              e.printStackTrace();              return "";        }      }

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