Android数据转化为Xml形式给客户端及客户端使用xml数据

（1）创建实体类News

public class News {
private Integer id;
private String title;
private Integer timelength;

public News(Integer id, String title, Integer timelength) {
this.id = id;
this.title = title;
this.timelength = timelength;
}
//get、set方法
}

（2）面向接口编程所创建的接口可接口的实现类：

public interface VideoNewsService {
/**
* 获取最新的视频资讯
* @return
*/
public List<News> getLastNews();

}

接口的实现类，用于加入一些假数据

public class VideoNewsServiceBean implements VideoNewsService {

public List<News> getLastNews(){
List<News> newes = new ArrayList<News>();
newes.add(new News(90, "喜羊羊与灰太狼全集", 78));
newes.add(new News(10, "实拍舰载直升东海救援演习", 28));
newes.add(new News(56, "喀麦隆VS荷兰", 70));
return newes;
}
}

（3）通过servlet返回数据大客户端

public class ListServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private VideoNewsService service = new VideoNewsServiceBean();

protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}

protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
List<News> videos = service.getLastNews();
request.setAttribute("videos", videos);
//重定向一个jsp界面，当客户端请求的时候返回的是该jsp页面数据
request.getRequestDispatcher("/WEB-INF/page/videonews.jsp").forward(request, response);
}
}

（4）生成xml文件的jsp页面（这里返回的为xml文件所以contentType=”text/xml”）

<%@ page language="java" contentType="text/xml; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<?xml version="1.0" encoding="UTF-8"?>
<videonews>
<c:forEach items="${videos}" var="video">
<news id="${video.id}">
<title>${video.title}</title>
<timelength>${video.timelength}</timelength>
</news>
</c:forEach>
</videonews>

（5）在客户端中使用xml文件

同样的客户端同样需要一个News实体类，这里省略

创建一个service类用于解析xml和返回xml文件数据

public class VideoNewsService {
/**
* 获取最新的视频资讯
*/
public static List<News> getLastNews() throws Exception{
String path = "请求servlet的url";
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
if(conn.getResponseCode() == 200){
InputStream inStream = conn.getInputStream();
return parseXML(inStream);
}
return null;
}
/**
* 解析服务器返回的xml数据
<?xml version="1.0" encoding="UTF-8" ?>
<videonews>
<news id="35">
<title>喜羊羊与灰太狼全集</title>
<timelength>90</timelength>
</news>
<news id="12">
<title>老张与灰太狼</title>
<timelength>20</timelength>
</news>
<news id="56">
<title>老方与LILI</title>
<timelength>30</timelength>
</news>
</videonews>
*/
private static List<News> parseXML(InputStream inStream) throws Exception {
List<News> newses = new ArrayList<News>();
News news = null;
XmlPullParser parser = Xml.newPullParser();
parser.setInput(inStream, "UTF-8");
int event = parser.getEventType();
//对xml解析器的事件进行判断
while( event != XmlPullParser.END_DOCUMENT){
switch (event) {
case XmlPullParser.START_TAG:
if("news".equals(parser.getName())){
int id = new Integer(parser.getAttributeValue(0));
news = new News();
news.setId(id);
}else if("title".equals(parser.getName())){
news.setTitle(parser.nextText());
}else if("timelength".equals(parser.getName())){
news.setTimelength(new Integer(parser.nextText()));
}
break;

case XmlPullParser.END_TAG:
if("news".equals(parser.getName())){
newses.add(news);
news = null;
}
break;
}
event = parser.next();
}
return newses;
}
}

（6）在Mainactivity.java文件中使用（这里是为一个listview设置值）

public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

ListView listView = (ListView) this.findViewById(R.id.listView);
try {
List<News> videos = VideoNewsService.getLastNews();//需修改成你本机的Http请求路径
List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();
for(News news : videos){
HashMap<String, Object> item = new HashMap<String, Object>();
item.put("id", news.getId());
item.put("title", news.getTitle());
item.put("timelength", getResources().getString(R.string.timelength)
+ news.getTimelength()+ getResources().getString(R.string.min));
data.add(item);
}
SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item,
new String[]{"title", "timelength"}, new int[]{R.id.title, R.id.timelength});
listView.setAdapter(adapter);
} catch (Exception e) {
e.printStackTrace();
}
}
}

到此完成操作