jdom解析xml

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;

}