读取xml

[code="java"]
public class TestXml {

public static void main(String[] args) throws Exception {

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

factory.setNamespaceAware(true); // never forget this!

DocumentBuilder builder = factory.newDocumentBuilder();

Document doc = builder.parse("d://dd.xml");

                XPathFactory pathFactory = XPathFactory.newInstance();   

                XPath xpath = pathFactory.newXPath();   

                XPathExpression pathExpression = xpath.compile("//Model/o:Column/a:Name/text()");    

                Object result = pathExpression.evaluate(doc, XPathConstants.NODESET);   

                NodeList nodes = (NodeList) result;   
                for (int i = 0; i < nodes.getLength(); i++) {   
                        System.out.println(nodes.item(i).getNodeValue());   
                }   
        }   
} 

[/code]
dd.xml
[code="java"]
<?xml version="1.0" encoding="GB2312"?>
<?PowerDesigner AppLocale="UTF16" ID="{64EF704A-101D-4EF0-B2F3-F2586373698A}" Label="" Name="rank" Objects="203" Symbols="12"ID="{64EF704A-101D-4EF0-B2F3-F2586373698A}" Label="" Name="rank" Objects="203" Symbols="12" Target="ORACLE Version 10g" Type="{CDE44E21-9669-11D1-9914-006097355D9B}" signature="PDM_DATA_MODEL_XML"version="12.0.0.1700"?>

627887B7-D8B5-4151-936A-15A527C092B1/a:ObjectID
排行控制表ID/a:Name
rank_control_id/a:Code
1269244973/a:CreationDate
Administrator/a:Creator
1269259813/a:ModificationDate
Administrator/a:Modifier
排行控制表主键/a:Comment
NUMBER(19)/a:DataType
19/a:Length
1/a:Mandatory
/o:Column

[/code]
这样为什么不能读取？
但是下面这个不要命名空间的可以读取
[code="java"]
<?xml version="1.0" encoding="GB2312"?>
<?PowerDesigner AppLocale="UTF16" ID="{64EF704A-101D-4EF0-B2F3-F2586373698A}" Label="" Name="rank" Objects="203" Symbols="12"ID="{64EF704A-101D-4EF0-B2F3-F2586373698A}" Label="" Name="rank" Objects="203" Symbols="12" Target="ORACLE Version 10g" Type="{CDE44E21-9669-11D1-9914-006097355D9B}" signature="PDM_DATA_MODEL_XML"version="12.0.0.1700"?>


627887B7-D8B5-4151-936A-15A527C092B1
排行控制表ID
rank_control_id
1269244973
Administrator
1269259813
Administrator
排行控制表主键
NUMBER(19)
19
1


[/code]

[quote]试试去解析一下pdm文件里面的表的字段的信息。我现在就在搞这个，很难解析啊 [/quote]

难怪 PowerDesigner 的 看你的XML 咋那么别扭了！ 好的我试试！

[code="java"]xmlns:a="attribute" xmlns:c="collection" xmlns:o="object"[/code]
可能是这个命名空间不规范 或者 错了吧!

XML 经常用！ 解析的也不少！ 没解析过加命名空间的！ 关，注下
能否补充下！ 有错误信息没？

public static void main(String[] args) {
File f = new File("WebRoot/swdqyxxadd.xml");
Document doc = null;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder db = dbf.newDocumentBuilder();
try {

            // doc = db.parse(f);//用文件形式来读取数据
            String str = "<?xml version='1.0' encoding='gb2312'?>   " +
                    "<CorpInfos>    " +
                    "<CorpInfo>     " +
                    "<GUID>0A23B90600000110BA538FC800000096</GUID><!-- 唯一标识，南大不需要关心 -->     " +
                    "<YYZZZCH>991991</YYZZZCH><!-- 营业执照注册号 -->        " +
                    "<ZZJGDM>123123</ZZJGDM><!-- 组织机构代码 --> " +
                    "</CorpInfo>" +
                    "</CorpInfos>";
            InputStream is = new ByteArrayInputStream(str.getBytes());//将字符串改成流的形式
            doc = db.parse(is);//以流的形式读取
        } catch (IOException e) {
            System.out.println("没找到此文件");
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    NodeList list = doc.getElementsByTagName("CorpInfo");
    System.out.println(doc.getElementsByTagName("GUID").item(0).getFirstChild().getNodeValue());

// Element element = null;
// System.out.println(list.getLength());
// for (int i = 0; i < list.getLength(); i++) {
// element = (Element) list.item(i);
// NodeList guid = element.getElementsByTagName("GUID");
// System.out.println(guid.item(0).getFirstChild().getNodeValue());
//// System.out.println(element.getElementsByTagName("YYZZZCH").item(i)
//// .getFirstChild().getNodeValue());
// }
}

用用我的方法 绝对管用