Dom4j递归删除

递归查找XML节点，如果节点属性符合要求，保留该节点以及所有父亲节点；如果节点以及子节点都不符合要求，全部删除。

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package test.mytest;import java.util.List;import org.apache.ibatis.io.Resources;import org.dom4j.Document;import org.dom4j.Element;import org.dom4j.Node;import org.dom4j.io.SAXReader;public class XMLHandle {private boolean walkChildElement = true;private boolean exclusiveElement = true;private boolean hasElement=true;public String  getXMLString(List<String> datalist) throws Exception {SAXReader saxReader = new SAXReader();Document document = saxReader.read(Resources.getResourceAsStream("list.xml"));Element tElement = (Element) document.selectSingleNode("/root");treeWalk(tElement, datalist);return tElement.asXML();}private void treeWalk(Element element, List<String> datalist) {for (int i = 0, size = element.nodeCount(); i < size; i++) {walkChildElement = true;exclusiveElement = true;Node node = element.node(i);if (node instanceof Element) {Element childelement = (Element) node;boolean hasContent = node.hasContent();System.out.println(childelement.attribute("i").getValue());for (String str : datalist) {if (childelement.attribute(0).getValue().equals(str)) {walkChildElement = false;exclusiveElement = false;}}if (walkChildElement && hasContent) {treeWalk((Element) node, datalist);}if (exclusiveElement && !hasContent) {System.out.println("!hasContent:  "+ childelement.attribute("i").getValue());element.remove(childelement);i--;}}}hasElement = element.hasContent();if (element.isTextOnly()) {hasElement = false;}if (!hasElement) {//System.out.println("content: " + element.attribute("i").getValue());if(!element.isRootElement()){element.getParent().remove(element);}}}}

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package test.mytest;import java.util.ArrayList;import java.util.List;public class Test {public static void main(String[] args) throws Exception {List<String> datalist = new ArrayList<String>();datalist.add("item1");datalist.add("item2");datalist.add("item3");datalist.add("item4");XMLHandle xmlHandle=new XMLHandle();String xmlString=xmlHandle.getXMLString(datalist);System.out.println(xmlString);}}

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<?xml version="1.0" encoding="UTF-8"?><root>    <n i="o1">        <n i="one1">            <n i="item1"></n>            <n i="item5"></n>            <n i="item6"></n>            <n i="item7"></n>        </n>    </n>    <n i="o2">        <n i="one2">            <n i="item8"></n>            <n i="item9"></n>            <n i="item10"></n>            <n i="item11"></n>        </n>    </n>    <n i="o3">        <n i="item3">            <n i="item8"></n>             <n i="item9"></n>            <n i="item10"></n>            <n i="item11"></n>        </n>    </n>     <n i="o4">        <n i="item">            <n i="item8"></n>            <n i="item4"></n>            <n i="item10"></n>            <n i="item11"></n>        </n>    </n></root>

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