DOM4J中通过XPath操作DOM节点

最新推荐文章于 2022-11-29 16:01:38 发布

IT农夫

最新推荐文章于 2022-11-29 16:01:38 发布

阅读量3.3k

点赞数

分类专栏： J2EE 文章标签： string namespaces null file action xml

本文链接：https://blog.youkuaiyun.com/kkdelta/article/details/5786224

版权

J2EE 专栏收录该内容

54 篇文章

订阅专栏

本文通过介绍如何从XML文件中读入,操作DOM和输出DOM到文件来说明如何在DOM4J中通过XPath操作DOM节点.

1,读入XML

        Document originalTemplate1 = TemplateUtil.getDocument("com/test/xml/dom4j/templateopr/template1.xml");
        Document originalTemplate2 = TemplateUtil.getDocument("com/test/xml/dom4j/templateopr/template2.xml");
        Document originalTemplate3 = TemplateUtil.getDocument("com/test/xml/dom4j/templateopr/template3.xml");
2,通过XPath操作节点:

        TemplateUtil.setNodeValue(originalTemplate2,"//m0:t2/m0:e2e/m0:E2EDATA","E2E VALUE");
        TemplateUtil.setNodeValue(originalTemplate2,"//m0:t2/m1:serviceState/m1:stateCode","CODE VALUE");

        TemplateUtil.setNodeValue(originalTemplate3,"//m2:t3/m2:serviceAddressing/m2:messageId","msg id");
        TemplateUtil.setNodeValue(originalTemplate3,"//m2:t3/m3:cloud/m3:mode","code");


        Element t2Place = (Element)originalTemplate1.selectSingleNode("//m2:t2place");
        Node t2Node = originalTemplate2.selectSingleNode("//m0:t2");

        //将一个节点加到另外一个节点中作为子节点
        t2Place.add((Node)t2Node.clone());

        Node t3Node = originalTemplate3.selectSingleNode("//m2:t3");
        Element t3Place = (Element)originalTemplate1.selectSingleNode("//m3:t3place");
        t3Place.add((Node)t3Node.clone());

3,将XML DOM输出:

TemplateUtil.createFile(originalTemplate1,"D:/temp/test1.xml");

附:用到的TemplateUtil类:

public class TemplateUtil {
    private static HashMap<String, Document> templateMap = new HashMap<String, Document>();

    private static Map<String, String> getNameSpace() {
        Map<String, String> ns = new HashMap<String, String>();

        ns.put("m0", "http://www.test.com/m0/");
        ns.put("m1", "http://www.test.com/m1/");
        ns.put("m2", "http://www.test.com/m2/");
        ns.put("m3", "http://www.test.com/m3/");

        return ns;
    }

    public static Document getDocument(String tempaltePath,Map<String, String> nameSpaces) throws DocumentException {
        Document document = null;
        if (templateMap.get(tempaltePath) != null) {
            document = (Document) templateMap.get(tempaltePath).clone();
        } else {
            synchronized (templateMap) {
                document = readRequestFileTemplete(tempaltePath, nameSpaces);
                templateMap.put(tempaltePath, document);
                document = (Document) document.clone();
            }
        }
        return document;
    }

    public static Document getDocument(String tempaltePath) throws DocumentException {
        Document document = null;
        if (templateMap.get(tempaltePath) != null) {
            document = (Document) templateMap.get(tempaltePath).clone();
        } else {
            synchronized (templateMap) {
                document = readRequestFileTemplete(tempaltePath, getNameSpace());
                templateMap.put(tempaltePath, document);
                document = (Document) document.clone();
            }
        }
        return document;
    }

    private static Document readRequestFileTemplete(String file, Map<String, String> namespaceURIs)
            throws DocumentException {
        DocumentFactory documentFactory = new DocumentFactory();
        documentFactory.setXPathNamespaceURIs(namespaceURIs);
        SAXReader reader = new SAXReader();
        reader.setDocumentFactory(documentFactory);

        InputStream isFile = Thread.currentThread().getContextClassLoader().getResourceAsStream(file);
        Document doc = reader.read(isFile);
        return doc;
    }

    public static void setNodeValue(Document node, String nodeXpath, String nodeValue) {
        Node e = node.selectSingleNode(nodeXpath);
        if (e != null) {
            e.setText(nodeValue == null ? "" : nodeValue);
        }
    }

    public static File createFile(Document sourceDoc, String sourceFileName) throws FileNotFoundException,
            UnsupportedEncodingException, IOException {

        File finalFile = new File(sourceFileName);
        FileOutputStream out = new FileOutputStream(finalFile);
        XMLWriter writer = new XMLWriter(out);
        writer.write(sourceDoc);
        return finalFile;
    }
}

XML

template1.xml

template2.xml

template3.xml

<template xmlns:m2="http://www.test.com/m2/"
xmlns:m3="http://www.test.com/m3/">
    <m2:t3>

        <m2:serviceAddressing>
            <m2:from>
                http://intra.test.com/
            </m2:from>
            <m2:to>
                <m2:address>
                    http://ccm.intra.test.com
                </m2:address>
            </m2:to>
            <m2:replyTo>
                <m2:address>
                    http://intra.test.com/
                </m2:address>
            </m2:replyTo>
            <m2:messageId>
                8000588300000
            </m2:messageId>
            <m2:action>
                http://ccm.intra.test.com
            </m2:action>
        </m2:serviceAddressing>

        <m3:cloud>
            <m3:mode>
                All_Or_Nothing
            </m3:mode>
        </m3:cloud>
    </m2:t3>
</template>