如何获取复杂数据类型的内容模型答案

【问题标题】：How to get content model for complex datatype如何获取复杂数据类型的内容模型
【发布时间】：2014-01-16 13:24:45
【问题描述】：

我需要在 xsd 中声明的复杂类型的 contentModel 我的 XSD 如下：

<element name="add">
<complexType>
 <sequence>
  <element name="no1" type="xsd:int" minOccurs="0"/>
  <element name="no2" type="xsd:int" minOccurs="1" maxOccurs="5"/>
 </sequence>
</complexType>

我为此使用以下代码：

//elem is ScheamType for the rootnode , in this case it is add
    if (elem != null) {

        System.out.println("\ncontent of "+elem +"   is    "+elem.getContentType());
         if(elem.getContentType()==3||elem.getContentType()==4)

        {   
             SchemaParticle particle=elem.getContentModel();

        for( SchemaParticle p:particle.getParticleChildren())

        {

             System.out.println("\nchild:"+p.getName()+"\ttype:"+p.getType().getName().getLocalPart());

        }

        }

但它为 getContentModel() 返回的 SchemaParticle 对象给出了 NullPointerException

代码适用于以下 xsd：

<complexType name="Employee"> <sequence> <element name="empid" type="xsd:int"/> <element name="empname" nillable="true" type="xsd:string"/> </sequence> </complexType>

【问题讨论】：

回答您的问题需要通读 100 行代码。通过仅发布相关位来减少您的代码示例。另外，为什么不提供导致 XSD 验证错误的 XML 输出？你不觉得这可能有帮助吗？
@hugh 现在你可以看看，我正在读取包含 XSD 的 wsdl 文件。

标签： xml xsd schema xmlbeans

【解决方案1】：

找到了解决办法：

//The elem is the SchemaType variable
SchemaParticle rootSchemaParticle = elem.getContentModel();
        SchemaLocalElement rootSchemaLocalElement = (SchemaLocalElement) rootSchemaParticle;
        //Get the SchemaType for the element.
        SchemaType rootSchemaType = rootSchemaLocalElement.getType();
        //Get the content Model of the root Element ie; the Children Structure for elem
        SchemaParticle childrenSchemaparticle = rootSchemaType.getContentModel();

        if (childrenSchemaparticle != null) {// Operation has non zero child element
            if (childrenSchemaparticle.countOfParticleChild() > 0) {// multiple child elements
                for (int i = 0; i < childrenSchemaparticle
                        .countOfParticleChild(); i++) {
                    paraName = childrenSchemaparticle.getParticleChild(i).getName().getLocalPart();
                    SchemaLocalElement childSchemaLocalElement = (SchemaLocalElement) childrenSchemaparticle.getParticleChild(i);
                    minOccur = childSchemaLocalElement.getMinOccurs().longValue();
                    maxOccur = childSchemaLocalElement.getMaxOccurs().longValue();
                    SchemaType childSchemaType = childSchemaLocalElement.getType();
                    dataType = childSchemaType.getName().getLocalPart();
                    System.out.println("parameter Name "+paraName + " Datatype "+dataType+" Minoccur "+minOccur+" MaxOccur "+maxOccur);                 
                }
            } else {// Single child                 
                paraName = childrenSchemaparticle.getName().getLocalPart();
                minOccur = childrenSchemaparticle.getMinOccurs().longValue();
                maxOccur = childrenSchemaparticle.getMaxOccurs().longValue();
                SchemaLocalElement childSchemaLocalElement = (SchemaLocalElement) childrenSchemaparticle;
                SchemaType childSchemaType = childSchemaLocalElement.getType();
                dataType = childSchemaType.getName().getLocalPart();
                System.out.println("parameter Name "+paraName + " Datatype "+dataType+" Minoccur "+minOccur+" MaxOccur "+maxOccur);
            }
        }

处理单子和多子的区别在于 Particle 的类型不同，单子是 ELEMENT，多子是 SEQUENCE。详情参考：http://xmlbeans.apache.org/docs/2.0.0/reference/org/apache/xmlbeans/SchemaParticle.html

【讨论】：