通过dom4j解析xml字符串

import java.util.Iterator; import java.util.List; import org.dom4j.Attribute; import org.dom4j.Document; import org.dom4j.DocumentHelper; import org.dom4j.Element; public class Test { @SuppressWarnings("unchecked") public static void main(String[] args) throws Exception { String xml = "<request> <param name='service'>single_trade_query </param><param name='_input_charset'>utf-8 </param><param name='partner'>2088001513232645 </param><param name='out_trade_no'>20090422577264 </param></request>"; Document document = DocumentHelper.parseText(xml); Element root = document.getRootElement(); List<Element> elements = root.elements(); for (Iterator<Element> it = elements.iterator(); it.hasNext();) { Element element = it.next(); List<Attribute> attributes = element.attributes(); for (int i = 0; i < attributes.size(); i++) { Attribute attribute = attributes.get(i); if ("service".equals(attribute.getText())) { System.out.println(element.getName() + " : " + element.getText()); } } } } }

或者：

import java.io.StringReader; import java.util.Iterator; import java.util.List; import org.dom4j.Document; import org.dom4j.Element; import org.dom4j.io.SAXReader; import org.xml.sax.InputSource; public class Test { @SuppressWarnings("unchecked") public static void main(String[] args) throws Exception { String xml = "<servlet><description></description><display-name>TestServlet</display-name><servlet-name>TestServlet</servlet-name><servlet-class>test.TestServlet</servlet-class></servlet>"; InputSource in = new InputSource(new StringReader(xml)); in.setEncoding("UTF-8"); SAXReader reader = new SAXReader(); Document document = reader.read(in); Element root = document.getRootElement(); List<Element> elements = root.elements(); for(Iterator<Element> it = elements.iterator();it.hasNext();){ Element element = it.next(); System.out.println(element.getName()+" : "+element.getTextTrim()); } } }

或者增加ID属性，直接通过ID获取某个属性值：

import java.io.StringReader; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.Element; import org.dom4j.io.SAXReader; import org.xml.sax.InputSource; public class Test { public static void main(String args[]) { String xml = "<request> <param name='service' ID='tt'>single_trade_query </param><param name='_input_charset'>utf-8 </param><param name='partner'>2088001513232645 </param><param name='out_trade_no'>20090422577264 </param></request>"; InputSource source = new InputSource(new StringReader(xml)); SAXReader reader = new SAXReader(); Document document = null; try { document = reader.read(source); } catch (DocumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } Element root = document.getRootElement(); System.out.println(document.elementByID("tt").getTextTrim()); System.out.println(root.elementByID("tt").getTextTrim()); } }

注意：通过ID获取，元素ID属性名必须为“大写ID”，小写的“id”会认为是普通属性！