Android獲取網絡XML/JSON數據

Video.java

1. package cn.itcast.domain;
3. public class Video {
4. private Integer id;
5. private String title;
6. private Integer time;
8. public Video(){}
10. public Video(Integer id, String title, Integer time) {
11. this.id = id;
12. this.title = title;
13. this.time = time;
14. }
15. public Integer getId() {
16. return id;
17. }
18. public void setId(Integer id) {
19. this.id = id;
20. }
21. public String getTitle() {
22. return title;
23. }
24. public void setTitle(String title) {
25. this.title = title;
26. }
27. public Integer getTime() {
28. return time;
29. }
30. public void setTime(Integer time) {
31. this.time = time;
32. }
34. }

StreamTool.java

1. package cn.itcast.utils;
3. import java.io.ByteArrayOutputStream;
4. import java.io.InputStream;
6. public class StreamTool {
8. /**
9. * 從輸入流中獲取數據
10. * @param inStream 輸入流
11. * @return
12. * @throws Exception
13. */
14. public static byte[] readInputStream(InputStream inStream) throws Exception{
15. ByteArrayOutputStream outStream = new ByteArrayOutputStream();
16. byte[] buffer = new byte[1024];
17. int len = 0;
18. while( (len=inStream.read(buffer)) != -1 ){
19. outStream.write(buffer, 0, len);
20. }
21. inStream.close();
22. return outStream.toByteArray();
23. }
24. }

VideoService.java

1. package cn.itcast.service;
3. import java.io.InputStream;
4. import java.net.HttpURLConnection;
5. import java.net.URL;
6. import java.util.ArrayList;
7. import java.util.List;
9. import org.json.JSONArray;
10. import org.json.JSONObject;
11. import org.xmlpull.v1.XmlPullParser;
13. import Android.util.Xml;
15. import cn.itcast.domain.Video;
16. import cn.itcast.utils.StreamTool;
18. public class VideoService {
19. /**
20. * 獲取最新的視頻資訊
21. * @return
22. * @throws Exception
23. */
24. public static List<Video> getLastVideos() throws Exception{
25. String path = "http://192.168.1.100:8080/videoweb/video/list.do";
26. URL url = new URL(path);
27. HttpURLConnection conn = (HttpURLConnection)url.openConnection();
28. conn.setReadTimeout(5*1000);
29. conn.setRequestMethod("GET");
30. InputStream inStream = conn.getInputStream();
31. return parseXML(inStream);
32. }
34. public static List<Video> getJSONLastVideos() throws Exception{
35. List<Video> videos = new ArrayList<Video>();
36. String path = "http://192.168.1.100:8080/videoweb/video/list.do?format=json";
37. URL url = new URL(path);
38. HttpURLConnection conn = (HttpURLConnection)url.openConnection();
39. conn.setReadTimeout(5*1000);
40. conn.setRequestMethod("GET");
41. InputStream inStream = conn.getInputStream();
42. byte[] data = StreamTool.readInputStream(inStream);
43. String json = new String(data);
44. JSONArray array = new JSONArray(json);
45. for(int i=0 ; i < array.length() ; i++){
46. JSONObject item = array.getJSONObject(i);
47. int id = item.getInt("id");
48. String title = item.getString("title");
49. int timelength = item.getInt("timelength");
50. videos.add(new Video(id, title, timelength));
51. }
52. return videos;
53. }
54. /**
55. * 解析服務器返回的協議，得到視頻資訊
56. * @param inStream
57. * @return
58. * @throws Exception
59. */
60. private static List<Video> parseXML(InputStream inStream) throws Exception{
61. List<Video> videos = null;
62. Video video = null;
63. XmlPullParser parser = Xml.newPullParser();
64. parser.setInput(inStream, "UTF-8");
65. int eventType = parser.getEventType();//產生第一個事件
66. while(eventType!=XmlPullParser.END_DOCUMENT){//只要不是文檔結束事件
67. switch (eventType) {
68. case XmlPullParser.START_DOCUMENT:
69. videos = new ArrayList<Video>();
70. break;
72. case XmlPullParser.START_TAG:
73. String name = parser.getName();//獲取解析器當前指向的元素的名稱
74. if("video".equals(name)){
75. video = new Video();
76. video.setId(new Integer(parser.getAttributeValue(0)));
77. }
78. if(video!=null){
79. if("title".equals(name)){
80. video.setTitle(parser.nextText());//獲取解析器當前指向元素的下一個文本節點的值
81. }
82. if("timelength".equals(name)){
83. video.setTime(new Integer(parser.nextText()));
84. }
85. }
86. break;
88. case XmlPullParser.END_TAG:
89. if("video".equals(parser.getName())){
90. videos.add(video);
91. video = null;
92. }
93. break;
94. }
95. eventType = parser.next();
96. }
97. return videos;
98. }
99. }

MainActivity.java

1. package cn.itcast.videoclient;
3. import java.util.ArrayList;
4. import java.util.HashMap;
5. import java.util.List;
7. import cn.itcast.domain.Video;
8. import cn.itcast.service.VideoService;
9. import android.app.Activity;
10. import android.os.Bundle;
11. import android.util.Log;
12. import android.widget.ListView;
13. import android.widget.SimpleAdapter;
14. import android.widget.Toast;
16. public class MainActivity extends Activity {
17. private ListView listView;
18. @Override
19. public void onCreate(Bundle savedInstanceState) {
20. super.onCreate(savedInstanceState);
21. setContentView(R.layout.main);
23. listView = (ListView)this.findViewById(R.id.listView);
24. try {
25. List<Video> videos = VideoService.getJSONLastVideos();
26. List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();
27. for(Video video : videos){
28. HashMap<String, Object> item = new HashMap<String, Object>();
29. item.put("id", video.getId());
30. item.put("title", video.getTitle());
31. item.put("timelength", "時長:"+ video.getTime());
32. data.add(item);
33. }
34. SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item,
35. new String[]{"title", "timelength"}, new int[]{R.id.title, R.id.timelength});
36. listView.setAdapter(adapter);
37. } catch (Exception e) {
38. Toast.makeText(MainActivity.this, "獲取最新視頻資訊失敗", 1).show();
39. Log.e("MainActivity", e.toString());
40. }
41. }
42. }