如何调用并解析调用远程接口返回的xml数据

如何解析调用远程接口返回的xml数据 .
dom4j-1.6.1.jar
jaxen-1.1-beta-6.jar
jdom.jar
此三jar包用于解析调用远程接口返回的xml数据，
很方便，例如：

package com.my.test;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
/**
* 如何调用接口
* @author
*
*/

public class AnalysisXml {

public static void main(String args[]) throws DocumentException
{
String appserverIp = "10.137.121.51";
String appserverPort="8060";
String rqestXml ="

<message><head><guid>mobile</guid></head><body><params><pwd>ads324sdsa4sf3w</pwd><callbacku

/></params></body></message>";
//访问远程接口
String url = "http://" + appserverIp + ":" + appserverPort
   + "/eSpace/appserver/applogin.action";
String result = getHttp(rqestXml, url);
//返回xml数据并解析
Document doc = DocumentHelper.parseText(result);
String appid = doc.selectSingleNode("/message/body/params/appid").getText();
String tag = doc.selectSingleNode("/message/body/params/tag").getText();
String eid = doc.selectSingleNode("/message/body/params/eid").getText();

System.out.println(doc);
}
/**
     * 发送http请求并得到响应数据流
     * @param str
     * @param url
     * @return data String
     */

    public static String getHttp(String str, String url)
    {

try

        {

            URL server = new URL(url);
            HttpURLConnection httpConnection = (HttpURLConnection)server.openConnection();
            httpConnection.setRequestProperty("Content-Type", "text/xml; charset=UTF-8");
            httpConnection.setRequestProperty("Accept", "application/x-www-form-

urlencoded");
            httpConnection.setRequestProperty("version", "100");

            httpConnection.setConnectTimeout(120000);
            httpConnection.setReadTimeout(120000);
            httpConnection.setDoInput(true);
            httpConnection.setDoOutput(true);

            OutputStreamWriter out =
                new OutputStreamWriter(new BufferedOutputStream

(httpConnection.getOutputStream()), "UTF-8");
            out.write(str);
            out.flush();
            out.close();

            byte[] msgBody = null;
            DataInputStream dis = new DataInputStream(httpConnection.getInputStream());
            int length = httpConnection.getContentLength();
            //正常设置了Content-Length的值

            if (length >= 0)
            {
                msgBody = new byte[length];
                dis.readFully(msgBody);
}
            // 未设置值

            else
            {
                byte[] temp = new byte[1024];
                int n = 0;
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                while ((n = dis.read(temp)) != -1)
                {
                    bos.write(temp, 0, n);
                }
                msgBody = bos.toByteArray();
                bos.close();
            }
            dis.close();
            String data = new String(msgBody, "UTF-8").trim();

            httpConnection.disconnect();
            return data;
        }
        catch (MalformedURLException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        catch (UnsupportedEncodingException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
}
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return null;

    }
}