Question

如果列表中的某个子节点引用了此列表中位于下方的其他子节点，如何通过使用XStream从XML获取对象。尝试：

<projectEstimate id="586">
    <projectEstimateKosgus class="list">

      <projectEstimateKosgu>
        <amount>1.00</amount>
        <parent class="projectEstimateKosgu" reference="/projectEstimate/projectEstimateKosgus/projectEstimateKosgu[2]"/>
        <estimate class="projectEstimate" reference="/projectEstimate"/>
      </projectEstimateKosgu>

      <projectEstimateKosgu>
        <amount>2.00</amount>
        <estimate class="projectEstimate" reference="/projectEstimate"/>
      </projectEstimateKosgu>

    </projectEstimateKosgus>
</projectEstimate>

projectEstimate对象具有集合字段“projectEstimateKosgus”，此集合的子节点具有字段“parent”，该字段引用此集合中的“projectEstimateKosgu”对象。当我尝试在标记中设置父级时，它位于引用标记的上方，我得到：

com.thoughtworks.xstream.converters.ConversionException: Invalid reference

但是，如果改变“projectEstimateKosgu”标签的顺序，就像这样

<projectEstimate id="586">
    <projectEstimateKosgus class="list">

      <projectEstimateKosgu>
        <amount>2.00</amount>
        <estimate class="projectEstimate" reference="/projectEstimate"/>
      </projectEstimateKosgu>

      <projectEstimateKosgu>
        <amount>1.00</amount>
        <parent class="projectEstimateKosgu" reference="/projectEstimate/projectEstimateKosgus/projectEstimateKosgu"/>
        <estimate class="projectEstimate" reference="/projectEstimate"/>
      </projectEstimateKosgu>

    </projectEstimateKosgus>
</projectEstimate>

Answer 1

您可以将relative absolute mode用于XStream对象，方法是将其模式设置为：

  xstream.setMode(XStream.XPATH_ABSOLUTE_REFERENCES);

或者您可以将ID mode用于XStream对象，方法是将其模式设置为：

  xstream.setMode(XStream.ID_REFERENCES);

Reference

集合中的Xstream绝对引用

1 个答案: