JAXB将XML编组到HashMap中

Question

I have a complex XML Structure as below which needs to be unmarshalled:

<abc>
      <pqr>
        <attribute>name</attribute>
        <entry>
          <priorityKey>
            <class>123</class>
            <reason>abc</reason>
          </prioritykey>
          <priority> 1 </priority>
        </entry>

        <entry>
          <prioritykey>
            <class>456</class>
            <reason>abc1</reason>
          </prioritykey>
          <priority>2</priority>
        </entry>
      </pqr>

      <pqr>
       '''
       '''
      </pqr>
    </abc>

abc is the root node. It can have multiple pqr elements. Each pqr element has one attribute node and multiple entry nodes. So I believe it will be of type HashMap(entry,attribute).

Each entry in turn has prioritykey and priority which I believe will be of type HashMap (prioritykey,priority).

Need to unmarshall this xml but not getting how to configure the XMLAdapter

Answer 1

Here, create the contract first. I created one as part of my learning process...

<xs:element name="abc" type="abcType" />

<xs:complexType name="abcType">
    <xs:sequence>
        <xs:element name="pqr" type="pqrType" minOccurs="1"
            maxOccurs="unbounded" />
    </xs:sequence>
</xs:complexType>
<xs:complexType name="pqrType">
    <xs:sequence>
        <xs:element name="attribute" type="xs:string" minOccurs="1"
            maxOccurs="1" />
        <xs:element name="entry" type="entryType" minOccurs="1"
            maxOccurs="unbounded" />
    </xs:sequence>
</xs:complexType>

<xs:complexType name="entryType" >
    <xs:sequence>
        <xs:element name="priorityKey" type="priorityKeyType"
            minOccurs="1" maxOccurs="1" />
        <xs:element name="priority" type="xs:int" minOccurs="1"
            maxOccurs="1" />
    </xs:sequence>
</xs:complexType>
<xs:complexType name="priorityKeyType">
    <xs:sequence>
        <xs:element name="class" type="xs:int" minOccurs="1"
            maxOccurs="1" />
        <xs:element name="reason" type="xs:string" minOccurs="1"
            maxOccurs="1" />
    </xs:sequence>
</xs:complexType>

Copy and save this in an fileName.xsd file. Now, generate JAXB classes or artifacts. If you are using an IDE, then this is simple. Click on the fileName.xsd file and you should get some option to generate JAXB artifacts. Otherwise, you can always use jaxb-xjc.jar present in the lib present in the JAXB download.

Command for the same - java -jar jaxb-xjc.jar fileName.xsd .

As the artifacts are in place, you can use them to unmarshall the xml content in question.