竹里館→憶童年

最近在開發中遇到讀取XML文件出現的一些問題-JDOM技術讀取

XML代碼
 1<?xml version="1.0" encoding="gb2312"?>
 2<Result xmlns="http://www.fiorano.com/fesb/activity/DBQueryOnInput2/Out">
 3   <row resultcount="1">
 4      <users_id>1001     </users_id>
 5      <users_name>wangwei   </users_name>
 6      <users_group>80        </users_group>
 7      <users_address>1001號   </users_address>
 8   </row>
 9   <row resultcount="1">
10      <users_id>1002</users_id>
11      <users_name>wangwei   </users_name>
12      <users_group>80        </users_group>
13      <users_address>1002號   </users_address>
14   </row>
15   <row resultcount="1">
16      <users_id>1003</users_id>
17      <users_name>wangwei   </users_name>
18      <users_group>80        </users_group>
19      <users_address>1003號   </users_address>
20   </row>
21   <row resultcount="1">
22      <users_id>1004</users_id>
23      <users_name>wangwei   </users_name>
24      <users_group>80        </users_group>
25      <users_address>1004號   </users_address>
26   </row>
27</Result>

代碼當中 xmlns="http://www.fiorano.com/fesb/activity/DBQueryOnInput2/Out">
是這個XML文件的命名空間(Namespace)讀取該文檔的元素值時必須指定其命名空間不然會產生java.lang.NullPointerException 空指針異常
實際執行代碼

public class DuXMLTest2 {
    public void loadXMLdoc(){
        FileInputStream fi = null;
        try {
            fi = new FileInputStream("Test.xml");
            SAXBuilder sb = new SAXBuilder();
            try {
                Document doc = sb.build(fi);
                Element root = doc.getRootElement();
                Namespace ns = root.getNamespace();
                List jiedian = root.getChildren();
                Element et = null;
                for(int i=0;i<jiedian.size();i++){
                    et = (Element) jiedian.get(i);
                    System.out.println(et.getChild("users_id",ns).getText());
                }
            } catch (JDOMException e) {
                // TODO 自動生成 catch 塊
                e.printStackTrace();
            } catch (IOException e) {
                // TODO 自動生成 catch 塊
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            // TODO 自動生成 catch 塊
            e.printStackTrace();
        }
    }
    public static void main(String[] args){
        DuXMLTest2 dt = new DuXMLTest2();
        dt.loadXMLdoc();
    }
}