java 读取 XML 的一个问题。。。。。弄了三天都没有弄出来，求大师帮助

Question

以下是一个XML文件：
<?xml version="1.0" encoding="gb2312"?>
<ROOT ver="1.0" type="schinese">
  <RELEASETIME date="2008-05-28 20:00:00" />
  <STATION ID="54511" NAME="北京" PROVINCE="北京" DISTRICT="北京" TELCODE="010" POSTCODE="100081" LONGITUDE="116.28" LATITUDE="39.48" ALTITUDE="32">
    <FORECASTINFO>
      <FORECASTDATA DATE="2008-05-29" BWEA="浮尘" EWEA="晴" BWD="北风" EWD="北风" BWS="4-5级" EWS="4-5级" TMAX="24" TMIN="16" />
      <FORECASTDATA DATE="2008-05-30" BWEA="晴" EWEA="晴" BWD="北风" EWD="北风" BWS="4-5级" EWS="3-4级" TMAX="31" TMIN="14" />
      <FORECASTDATA DATE="2008-05-31" BWEA="多云" EWEA="阴" BWD="无风向" EWD="无风向" BWS="微风" EWS="微风" TMAX="27" TMIN="18" />
    </FORECASTINFO>
    <INDEXINFO>
      <INDEXDATA DATE="2008-05-29" CT_N="温凉"/>
    </INDEXINFO>
  </STATION>
</ROOT>现在想用DOM解析，将里面的DATE 和 CT_N属性值提出（打印出来）。本人弄了三天都没有弄出来。求大师帮助。在此万分感激。

Answer 1

public static void getDate(Document doc){
Element root = doc.getDocumentElement();
NodeList stations = root.getElementsByTagName("STATION");
Element beijing = null;
for(int i = 0 ; i< stations.getLength();i++){
beijing = (Element)stations.item(i);
if("54511".equals(beijing.getAttribute("ID"))){
NodeList indexInfos = beijing.getElementsByTagName("INDEXINFO");
Element indexInfo = (Element)indexInfos.item(0);
System.out.println(indexInfo.getAttribute("DATE"));
System.out.println(indexInfo.getAttribute("CT_N"));
return;
}
}
}

Answer 2

import java.io.File;import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;import org.w3c.dom.Document;
import org.w3c.dom.NodeList;public class t {
public static void main(String[] args) {
try {
DocumentBuilderFactory fac = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = fac.newDocumentBuilder();
Document doc = builder.parse(new File("d:/aa.xml"));
XPathFactory pathFactory = XPathFactory.newInstance();
XPath path = pathFactory.newXPath();
NodeList list = (NodeList) path.evaluate("//@DATE|//@CT_N", doc,
XPathConstants.NODESET); for (int i = 0; i < list.getLength(); i++) {
System.out.println(list.item(i).getNodeValue());
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
} }}2008-05-29
2008-05-30
2008-05-31
温凉
2008-05-29

Answer 3

import java.io.File;import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;import org.w3c.dom.Document;
import org.w3c.dom.NodeList;public class t {
    public static void main(String[] args) {
        try {
            DocumentBuilderFactory fac = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = fac.newDocumentBuilder();
            Document doc = builder.parse(new File("d:/aa.xml"));
            XPathFactory pathFactory = XPathFactory.newInstance();
            XPath path = pathFactory.newXPath();
            NodeList list = (NodeList) path.evaluate("//@DATE|//@CT_N", doc,
                    XPathConstants.NODESET);            for (int i = 0; i < list.getLength(); i++) {
                System.out.println(list.item(i).getNodeValue());
            }
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }    }}

Answer 4

上个礼拜看了个对XML删除数据的方法,有点问题 删除不了.
写的方法如下:  打印出来nnm.getLength()这个一直是0.看了一下方法也不知道什么原因
  public static void delElement(Document dc, String idValue) {
 NodeList nl=dc.getElementsByTagName("student");
    Element e;
    NamedNodeMap nnm;//属性集合
    Attr att;
    for(int i=0;i<nl.getLength();i++){
      e=(Element)nl.item(i);
      nnm=e.getAttributes();
      if(nnm!=null){
      for(int j=0;j<nnm.getLength();j++){
      att=(Attr)nnm.item(j);
      if((att.getName().equals("id"))&&(att.getValue().equals(idValue))){
        (e.getParentNode()).removeChild(e); 
        }
       }
      }
    }
    }

Answer 5

<?xml version="1.0" encoding="utf-8"?>
<studentInfo>
 
    <student>
    <name id="101">bb</name>
    <age>20</age>
    <sex>nan</sex>
    <score>79</score>
    </student>
    <student>
    <name id="102">cc</name>
    <age>20</age>
    <sex>nv</sex>
    <score>68</score>
    </student></studentInfo>

Answer 6

http://topic.csdn.net/u/20080616/18/2e0e0ba4-53cb-4384-824a-6917d6882feb.html
看这个的回复，我已经弄好了，记得结贴