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爪哇中如何解析高级XML文件

collada xml java

1

Espen · 技术社区 · 14 年前

我见过很多关于如何在Java中读取XML文件的例子。但它们只显示简单的XML文件。例如,它们演示了如何从XML文件中提取名字和姓氏。但是,我需要从collada XML文件中提取数据。这样地:

<library_visual_scenes>
    <visual_scene id="ID1">
        <node name="SketchUp">
            <instance_geometry url="#ID2">
                <bind_material>
                    <technique_common>
                        <instance_material symbol="Material2" target="#ID3">
                            <bind_vertex_input semantic="UVSET0" input_semantic="TEXCOORD" input_set="0" />
                        </instance_material>
                    </technique_common>
                </bind_material>
            </instance_geometry>
        </node>
    </visual_scene>
</library_visual_scenes>

这只是collada文件的一小部分。这里我需要提取视觉场景的ID,然后提取实例几何的URL,最后提取实例材质的目标。当然,我需要提取更多,但我不知道如何真正地使用它,这是一个开始的地方。

到目前为止,我有以下代码:

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
try {
    builder = factory.newDocumentBuilder();
}
catch( ParserConfigurationException error ) {
    Log.e( "Collada", error.getMessage() ); return;
}
Document document = null;
try {
    document = builder.parse( string );
}
catch( IOException error ) {
    Log.e( "Collada", error.getMessage() ); return;
}
catch( SAXException error ) {
    Log.e( "Collada", error.getMessage() ); return;
}
NodeList library_visual_scenes = document.getElementsByTagName( "library_visual_scenes" );

网络上的大多数例子似乎与此类似: http://www.easywayserver.com/blog/java-how-to-read-xml-file/

当我想要提取更深层的标签或者找到一个关于读取/解析XML文件的好教程时,我需要帮助来弄清楚该怎么做。

4 回复 | 直到 10 年前

1

4

Cratylus 14 年前

document = builder.parse( string );//document is loaded in memory as tree

NodeList library_visual_scenes = document.getElementsByTagName( "library_visual_scenes" );

 for (int i = 0; i < library_visual_scenes.getLength(); i++) {
   Element element = (Element) nodes.item(i);
   Node visual_scene = element.getFirstChild();
   if(visual_scene.getNodeType() == Node.ELEMENT_NODE)
   {
      String id = ((Element)visual_scene).getAttribute(id);
      System.out.println("id="+id);
    }
 }

2

6

LarsH 14 年前

builder.parse(string)

Here

/*/visual_scene/@id
/*/visual_scene/node/instance_geometry/@url
/*/visual_scene/node[@name = 'Sketchup']/instance_geometry/@url
/*/visual_scene/node/instance_geometry/bind_material/technique_common/instance_material/@target

3

1

bdoughan 14 年前

EclipseLink JAXB (MOXy)

package blog.geocode;

import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

import org.eclipse.persistence.oxm.annotations.XmlPath;

@XmlRootElement(name="kml")
@XmlType(propOrder={"country", "state", "city", "street", "postalCode"})
public class Address {

    @XmlPath("Response/Placemark/ns:AddressDetails/ns:Country/ns:AdministrativeArea/ns:SubAdministrativeArea/ns:Locality/ns:Thoroughfare/ns:ThoroughfareName/text()")
    private String street;

    @XmlPath("Response/Placemark/ns:AddressDetails/ns:Country/ns:AdministrativeArea/ns:SubAdministrativeArea/ns:Locality/ns:LocalityName/text()")
    private String city;

    @XmlPath("Response/Placemark/ns:AddressDetails/ns:Country/ns:AdministrativeArea/ns:AdministrativeAreaName/text()")
    private String state;

    @XmlPath("Response/Placemark/ns:AddressDetails/ns:Country/ns:CountryNameCode/text()")
    private String country;

    @XmlPath("Response/Placemark/ns:AddressDetails/ns:Country/ns:AdministrativeArea/ns:SubAdministrativeArea/ns:Locality/ns:PostalCode/ns:PostalCodeNumber/text()")
    private String postalCode;

}

http://bdoughan.blogspot.com/2010/09/xpath-based-mapping-geocode-example.html

4

0

Pete 10 年前