jdom当然要引入jdom的jar包了。
没有多余的废话，直接看解析代码：
例子1：读取本地xml文件并修改后保存为另一个xml文件
import java.io.File;import java.io.FileOutputStream;import java.util.List;import org.jdom.Attribute;import org.jdom.Document;import org.jdom.Element;import org.jdom.input.SAXBuilder;import org.jdom.output.Format;import org.jdom.output.XMLOutputter;public class JDomTest2{ public static void main(String[] args) throws Exception { //JDOM从XML中解析 SAXBuilder builder = new SAXBuilder(); //获得XML文档对象 Document doc = builder.build(new File("jdom.xml")); //得到文档根元素 Element element = doc.getRootElement(); System.out.println(element.getName()); //得到根元素下的hello元素 Element hello = element.getChild("hello"); System.out.println(hello.getText()); //得到hello子元素下的属性 List list = hello.getAttributes(); //得到hello元素下属性的名字和值 for(int i = 0 ;i < list.size(); i++) { Attribute attr = (Attribute)list.get(i); String attrName = attr.getName(); String attrValue = attr.getValue(); System.out.println(attrName + "=" + attrValue); } //删除hello下的world子元素 hello.removeChild("world"); //将文档保存到另一个文件 XMLOutputter out = new XMLOutputter(Format.getPrettyFormat().setIndent(" ")); out.output(doc, new FileOutputStream("jdom2.xml")); }}
例子2：获取webservice的参数，并通过xpath准确定位数据,且xml中有namespace（项目中常用）
public Map<String, Object> getNJXml(String xmlStr) throws JDOMException, IOException { Map<String, Object> map = new HashMap<String, Object>(); //解析 StringReader xmlReader=new StringReader(xmlStr); SAXBuilder bulider = new SAXBuilder(); Document document = bulider.build(xmlReader); Element element = document.getRootElement(); Namespace ns=element.getNamespace(); Element order = element.getChild("inFulfillmentOf",ns).getChild("order",ns); XPath xpath = getXpath("ns:id[@root='1.2.156.112722.1.2.1.20']"); Element id = (Element) xpath.selectSingleNode(order); String flow = id.getAttributeValue("extension"); map.put("flow", flow); xpath=getXpath("ns:component[4]"); Element structuredBody = element.getChild("component",ns).getChild("structuredBody",ns); Element component =(Element) xpath.selectSingleNode(structuredBody); String checkCont = component.getChild("section",ns).getChildText("text",ns); map.put("checkCont", checkCont);
return map;}
private XPath getXpath(String expression) throws JDOMException{ XPath xpath=XPath.newInstance(expression); xpath.addNamespace("ns", "urn:hl7-org:v3"); return xpath; }