實驗步驟:
1、 配置J2EE開發環境,並部署web應用viderweb,啟動服務
2、 打開浏覽器訪問網址
http://localhost:8080/videoweb/video/list.do
演示xml數據
3、 創建Android客戶端工程,實現訪問上面的網址並且將取得的xml數據進行解析並顯示,如下圖:
Android客戶端代碼
程序流程
資源
- <resources>
- <string name="app_name">視頻資訊客戶端</string>
- <string name="error">網絡連接失敗</string>
- </resources>
布局
main.xml
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="vertical" >
-
- <ListView
- android:id="@+id/listView"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent" />
-
- </LinearLayout>
item.xml
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:orientation="horizontal" >
-
- <TextView
- android:id="@+id/title"
- android:layout_width="250dip"
- android:layout_height="wrap_content" />
-
- <TextView
- android:id="@+id/timelength"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content" />
-
- </LinearLayout>
添加業務bean類Video
- package cn.class3g.domain;
-
- public class Video {
- private Integer id;
- private String title;
- private Integer timelength;
-
- public Video(Integer id, String title, Integer timelength) {
- super();
- this.id = id;
- this.title = title;
- this.timelength = timelength;
- }
- public Video() { }
- public Integer getId() {
- return id;
- }
- public void setId(Integer id) {
- this.id = id;
- }
- public String getTitle() {
- return title;
- }
- public void setTitle(String title) {
- this.title = title;
- }
- public Integer getTimelength() {
- return timelength;
- }
- public void setTimelength(Integer timelength) {
- this.timelength = timelength;
- }
- public String toString() {
- return "Video [id=" + id + ", title=" + title + ", timelength="
- + timelength + "]";
- }
- }
添加業務類VideoService類
- package cn.class3g.service;
- ...
- public class VideoService {
-
- /**
- * 從服務器獲取最新的視頻資訊
- *
- * @return
- * @throws Throwable
- */
- public static List<Video> getLastVideos() throws Throwable {
- String path =
- "http://192.168.1.102:8080/videoweb/video/list.do";//
- 實驗環境中使用pc的ip,不能用localhost或127.0.0.1
- URL url = new URL(path);
- HttpURLConnection conn = (HttpURLConnection) url.openConnection();
- conn.setConnectTimeout(5 * 1000);
- conn.setRequestMethod("GET");
- InputStream inStream = conn.getInputStream();
- return parseXML(inStream);
- }
-
- private static List<Video> parseXML(InputStream inStream) throws Exception {
- Video video = null;
- List<Video> videos = null;
- XmlPullParser pullParser = Xml.newPullParser();
- pullParser.setInput(inStream, "UTF-8");
-
- int event = pullParser.getEventType();// 觸發第一個事件
-
- while (event != XmlPullParser.END_DOCUMENT) {
- switch (event) {
- case XmlPullParser.START_DOCUMENT:
- videos = new ArrayList<Video>();
- break;
- case XmlPullParser.START_TAG:
- if ("video".equals(pullParser.getName())) {
- int id = new Integer(pullParser.getAttributeValue(0));
- video = new Video();
- video.setId(id);
- }
- if (video != null) {
- if ("title".equals(pullParser.getName())) {
- video.setTitle(pullParser.nextText());
- }
- if ("timelength".equals(pullParser.getName())) {
- video.setTimelength(new Integer(pullParser.nextText()));
- }
- }
- break;
-
- case XmlPullParser.END_TAG:
- if ("video".equals(pullParser.getName())) {
- videos.add(video);
- video = null;
- }
- break;
- }
- event = pullParser.next();
- }
- return videos;
- }
- }
Activity類MyVideoNewsActivity
- public class MyVideoNewsActivity extends Activity {
-
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
-
- try {
- List<Video> videos = VideoService.getLastVideos();//獲取最新視頻資訊
- ListView listView = (ListView)this.findViewById(R.id.listView);
- List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();
- for(Video video : videos){
- HashMap<String, Object> item = new HashMap<String, Object>();
- item.put("title", video.getTitle());
- item.put("timelength", "時長:"+video.getTimelength());
- item.put("id", video.getId());
- 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 (Throwable e) {
- Log.e("TAG", e.toString());
- Toast.makeText(this, R.string.error, 1).show();
- }
- }
- }
Androd中獲取網頁代碼
布局
- <Button
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="@string/btn_text"
- android:id="@+id/showBtn"
- />
-
- <ImageView
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:id="@+id/imageView"
- />
代碼:在前面的ImageService.getImage()方法基礎上修改即可
HtmlService
- public class HtmlService {
- /**
- * 獲取給定路徑的html代碼
- * @param path 網頁路徑
- * @return
- * @throws Exception
- */
- public static String getHtml(String path) throws Exception{
- URL url = new URL(path);
- //get //post
- HttpURLConnection conn = (HttpURLConnection)url.openConnection();
- conn.setRequestMethod("GET");
- conn.setConnectTimeout(5*1000);
- InputStream inStream = conn.getInputStream();
-
- ByteArrayOutputStream outStream = new ByteArrayOutputStream();
- byte[] buffer = new byte[1024];
- int len = 0;
- while( (len = inStream.read(buffer)) !=-1 ){
- outStream.write(buffer, 0, len);
- }
- byte[] data = outStream.toByteArray();//網頁的二進制數據
- outStream.close();
- inStream.close();
- return new String(data, "gb2312");
- }
- }
ShowHtmlActivity
- public void onClick(View v) {
- String path = pathText.getText().toString();
- try {
- String htmlcode = HtmlService.getHtml(path);
- resultView.setText(htmlcode);
- } catch (Exception e) {
- Log.e(TAG, e.toString());
- Toast.makeText(ShowHtmlActivity.this, R.string.error, 1).show();
- }
- }