Detailed explanation of dom4j operation xml sample code with colon-javaTutorial-php.cn

这几天被同事问道是否可以用dom4j来操作代用命名空间的xml（类似：这种标签）

由于没有研究过，同事决定使用java自带的api来编写。

今天有时间变查了一下资料，后来发现dom4j完全可以胜任这项工作。网上有很多代码，看来看去云里雾里的。后来看到一个网友写到（直接用冒号后边的标签就能取到），试了一下，果真可以。

下面写了一个测试例子，有xml的读写操作。有兴趣的朋友可以参考，代码比较简单，就不过多的介绍。

import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.util.List; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.Namespace; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter; import org.junit.Test; public class TestOperXML { //@Test public void testOfReader(){ String fileName = "D:\\tb_user1.xml"; SAXReader reader = new SAXReader(); try { Document doc = reader.read(new File(fileName)); Element root = doc.getRootElement(); Element content = root.element("XMI.content"); println(content.getName()); Element catalog = content.element("Catalog"); println(catalog.getName()); Namespace np = catalog.getNamespace(); println(catalog.getNamespace().getPrefix()); println("xmi.id:"+catalog.attribute("xmi.id").getText()); println("name:"+catalog.attribute("name").getText()); println("visibility:" + catalog.attribute("visibility").getText()); } catch (DocumentException e) { e.printStackTrace(); } } //@Test public void testOfWriter(){ Document doc = DocumentHelper.createDocument(); Element root = doc.addElement("XMI"); root.addNamespace("CWM", "org.omg.CWM1.0").addNamespace("CWMRDB", "org.omg.CWM1.0/Relational") .addNamespace("CWMOLAP", "org.omg.CWM1.0/OLAP").addNamespace("CWMTFM", "org.omg.CWM1.0/Transformation") .addAttribute("xmi.version", "1.1").addAttribute("timestamp", "5月 23 2016 13:10:03"); Element xmlHeader = root.addElement("XMI.header"); Element documentation = xmlHeader.addElement("XMI.documentation"); documentation.addElement("XMI.exporter").setText("Meta Integration Model Bridge"); documentation.addElement("XMI.exporterVersion").setText("6.0.3 - Jan 28 2009 18:35:56"); xmlHeader.addElement("metamodel").addAttribute("xmi.name", "CWM").addAttribute("xmi.version", "1.0"); Element content = root.addElement("XMI.content"); Element catalog = content.addElement("CWMRDB:Catalog").addAttribute("xmi.id", "_4").addAttribute("name", "Model_1") .addAttribute("visibility", "public"); catalog.addNamespace("CWMRDB", "org.omg.CWM1.0/Relational"); Element schema = catalog.addElement("CWM:Namespace.ownedElement").addNamespace("CWM", "org.omg.CWM1.0").addElement("Schema"); schema.addNamespace("CWMRDB", "org.omg.CWM1.0/Relational"); schema.addElement("CWM:Namespace.ownedElement").addNamespace("CWM", "org.omg.CWM1.0"); try { XMLWriter writer = new XMLWriter(new FileWriter("out.xml")); writer.write(doc); writer.close(); } catch (IOException e) { e.printStackTrace(); } } @Test public void testOfXPath(){ String fileName = "D:\\tb_user1.xml"; SAXReader reader = new SAXReader(); try { Document doc = reader.read(new File(fileName)); List list = doc.selectNodes("//XMI/XMI.content/CWMRDB:Catalog"); for(Object o : list){ Element ele = (Element)o; println(ele.getName()); List list1 = ele.selectNodes("//CWMRDB:Catalog"); println(list1); } }catch(Exception e){ e.printStackTrace(); } } private void println(Object o){ if(o == null){ System.out.println(":>> null "); }else{ System.out.println(":>> "+o.toString()); } } }

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xml代码：

    Meta Integration Model Bridge 6.0.3 - Jan 28 2009 18:35:56

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