java 在dom4j中，使用XPath处理XML（主要对命名空间的处理）

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.XPath;

import java.util.*;

/**
*  Java解析XML元素
*/
public class XML {

//要测试的xml对象,带有命名空间
static String str = "<rsiq to=\"378\" type=\"result\" from=\"12345678#hjh20120718150006@126.com/cti\">" +
"<query xmlns=\"http://te.com/resource/cti/getonlineseat\">" +
"<telephone>12345678</telephone>" +
"<session-id>20130328155409100477</session-id>" +
"<workgroup><groupname>66666</groupname><seats/></workgroup><workgroup><groupname>888</groupname><seats/></workgroup>" +
"<workgroup><groupname>test</groupname><seats>" +
"<seat><jid>378</jid><name>地方</name><seatnumber>378</seatnumber></seat>" +
"</seats></workgroup></query></rsiq>";
//要测试的xml对象,没有命名空间
static String str1 = "<rsiq to=\"378\" type=\"result\" from=\"12345678#hjh20120718150006@126.com/cti\">" +
"<query >" +
"<telephone>12345678</telephone>" +
"<session-id>20130328155409100477</session-id>" +
"<workgroup><groupname>66666</groupname><seats/></workgroup><workgroup><groupname>888</groupname><seats/></workgroup>" +
"<workgroup><groupname>test</groupname><seats>" +
"<seat><jid>378</jid><name>地方</name><seatnumber>378</seatnumber></seat>" +
"</seats></workgroup></query></rsiq>";

//传统方法一步一步解析带有命名空间的XML文件
@SuppressWarnings("unchecked")
private static void test() throws DocumentException {
List<Map<String, Object>> seatlist = new ArrayList<Map<String,Object>>();

Document document = DocumentHelper.parseText(str);
Element root = document.getRootElement();
Element query = root.element("query");
List<Element> workgroups = query.elements("workgroup");
for(Element workgroup : workgroups) {
Element seatsElement = workgroup.element("seats");
List<Element> seats = seatsElement.elements("seat");
for(Element seat : seats) {
Map<String, Object> seatmap = new HashMap<String, Object>();
String jid = seat.elementText("jid");
String seatname = seat.elementText("name");
String seatnumber = seat.elementText("seatnumber");
String sessioncount = seat.elementText("sessioncount");
seatmap.put("jid",jid);
seatmap.put("seatname",seatname);
seatmap.put("seatnumber",seatnumber);
seatmap.put("sessioncount",sessioncount);
seatlist.add(seatmap);
System.out.println(seatmap);
}
}
System.out.println(seatlist);
}

//Xpath方法解析没有命名空间的XML文件
@SuppressWarnings("unchecked")
private static void test1() throws DocumentException {
List<Map<String, Object>> seatlist = new ArrayList<Map<String,Object>>();

Document document = DocumentHelper.parseText(str1);
List seats = document.selectNodes("//seat");
for (int i = 0; i < seats.size(); i++) {
Map<String, Object> seatmap = new HashMap<String, Object>();
Element seat = (Element) seats.get(i);
String jid = seat.elementText("jid");
String seatname = seat.elementText("name");
String seatnumber = seat.elementText("seatnumber");
String sessioncount = seat.elementText("sessioncount");
seatmap.put("jid",jid);
seatmap.put("seatname",seatname);
seatmap.put("seatnumber",seatnumber);
seatmap.put("sessioncount",sessioncount);
seatlist.add(seatmap);
}
System.out.println(seatlist);
}

//带有命名空间的XML文件，Xpath的解析方法
@SuppressWarnings("unchecked")
private static void test2() throws DocumentException {
List<Map<String, Object>> seatlist = new ArrayList<Map<String,Object>>();

Map map = new HashMap();
map.put("getonlineseat","http://te.com/resource/cti/getonlineseat");
Document document = DocumentHelper.parseText(str);
XPath x = document.createXPath("//getonlineseat:seat");
x.setNamespaceURIs(map);
List nodelist = x.selectNodes(document);
for (int i = 0; i < nodelist.size(); i++) {
Map<String, Object> seatmap = new HashMap<String, Object>();
Element seat = (Element) nodelist.get(i);
String jid = seat.elementText("jid");
String seatname = seat.elementText("name");
String seatnumber = seat.elementText("seatnumber");
String sessioncount = seat.elementText("sessioncount");
seatmap.put("jid",jid);
seatmap.put("seatname",seatname);
seatmap.put("seatnumber",seatnumber);
seatmap.put("sessioncount",sessioncount);
seatlist.add(seatmap);
}
System.out.println(seatlist);
}

//主函数
public static void main(String args[]) throws DocumentException {
System.out.println("-----------test()方法------------");
test();
System.out.println("-----------test1()方法------------");
test1();
System.out.println("-----------test2()方法------------");
test2();
}
}