如何使用JAVA删除XML中的节点

6 日，10 小时 Questions & Answers 18369

我使用的XML文件是这样的，请注意有4个'target'标记

<?xml version="1.0" encoding="UTF-8" standalone="no"?><project basedir="." default="end" name="precompile">
<property name="charset" value="utf-8"/>

<target name="start">
</target>

<target depends="precompile-templates1,precompile-templates2" name="end">
    <echo>finish generating precompiled templates</echo>
</target>



<target name="precompile-templates1">
      <property name="outputJS1" value="jsp/jsp_2/js/templates.js"/>
      <property name="templatesPath1" value="jsp/jsp_2/js/tmpl"/>

      <java dir="${basedir}" failonerror="true" fork="true" jar="lib/js.jar">
        <arg value="otherFiles/lib/rhino-handlebars-compiler.js"/>
        <arg value="--handlebars"/>
        <arg value="otherFiles/third-party/handlebars-v1.3.0.js"/>
        <arg value="--templates"/>
        <arg value="${templatesPath1}"/>
        <arg value="--output"/>
        <arg value="${outputJS1}"/>
      </java>
      <echo>Template Precompiled to web/js/compiled-templates.js</echo>
        <echo> is now ready to compress....</echo>
</target>

<target name="precompile-templates2">
        <property name="outputJS2" value="jsp/jsp_3/js/templates.js"/>
        <property name="templatesPath2" value="jsp/jsp_3/js/tmpl"/>

        <java dir="${basedir}" failonerror="true" fork="true" jar="lib/js.jar">
        <arg value="otherFiles/lib/rhino-handlebars-compiler.js"/>
        <arg value="--handlebars"/>
        <arg value="otherFiles/third-party/handlebars-v1.3.0.js"/>
        <arg value="--templates"/>
        <arg value="${templatesPath2}"/>
        <arg value="--output"/>
        <arg value="${outputJS2}"/>
      </java>
      <echo>Template Precompiled to web/js/compiled-templates.js</echo>
        <echo> is now ready to compress....</echo>
</target></project>

我想保留前两个'target'节点，但删除'target'的其余两个节点。我该怎么办？我试着这样做：

File fXmlFile = new File(subBuildFile);
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder  dBuilder = dbFactory.newDocumentBuilder();
Document  doc = dBuilder.parse(fXmlFile);

Node s = doc.getElementsByTagName("target").item(1);

for(int i =2; i<doc.getElementsByTagName("target").getLength();i++){
    doc.getElementsByTagName("target").item(i).removeChild(doc.getElementsByTagName("target").item(i));
}

但总有这样一个类似的错误：

Exception in thread "main" org.w3c.dom.DOMException: NOT_FOUND_ERR: An attempt is made to reference a node in a context where it does not exist.
at com.sun.org.apache.xerces.internal.dom.ParentNode.internalRemoveChild(Unknown Source)
at com.sun.org.apache.xerces.internal.dom.ParentNode.removeChild(Unknown Source)
at xmlReader.Test.resetXML(Test.java:52)
at xmlReader.Test.main(Test.java:39)

有什么建议吗

另外：当我使用以下代码时，有些奇怪：

System.out.println("the number of target tag is "+doc.getElementsByTagName("target").getLength());

    for(int i =2; i<targets.getLength();i++){
        root.removeChild(targets.item(2));
        System.out.println(i);


    }

    System.out.println(doc.getElementsByTagName("target").getLength());

我使用的XML如下所示：

 <target name="start">
 </target>

<target depends="precompile-templates1,precompile-templates2" name="end">
    <echo>finish generating precompiled templates</echo>
</target>










<target id="2">
</target>
<target id="3">
</target>
<target id="4">
</target>

<target id="5">
</target>
<target id="6">
</target>

<target id="7">
</target>
<target id="8">
</target>
<target id="9">
</target>
<target id="10">
</target>
<target id="11">
</target>
<target id="12">
</target>
<target id="13">
</target>


















</project>

输出如下：

the number of target tag is 8
2
3
4
5

最终输出的XML如下所示：

<target name="start">
</target>

<target depends="precompile-templates1,precompile-templates2" name="end">
    <echo>finish generating precompiled templates</echo>
</target>





















<target id="11">
</target>
<target id="12">
</target>
<target id="13">
</target>
</project>

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