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Android采用PULL解析XML文档 [复制链接]

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发表于 2011-04-08 13:34 |只看该作者 |倒序浏览

Android系统中采用PULL技术解析XML文档比用SAX技术性能要好得多。建议Android的开发者采用PULL技术解析XML文档。跟SAX类似，只不过PULL技术返回的事件类型是整型，所以我们只要对返回的事件进行处理就行了。1.package com.cn.service;

5.import java.io.IOException;
6.
7.import java.io.InputStream;
8.
9.import java.io.OutputStream;
10.
11.import java.util.ArrayList;
12.
13.import java.util.List;
14.
15.
16.
17.import org.xmlpull.v1.XmlPullParser;
18.
19.import org.xmlpull.v1.XmlSerializer;
20.
21.
22.
23.import android.util.Xml;
24.
25.
26.
27.import com.cn.domain.Persion;
28.
29./****
30.
31.* 采用Pull解析XML
32.
33.*
34.
35.* ****/
36.
37.public class PULLPersionService {
38.
39.
40.
41. public static List<Persion> getPersino(InputStream is)throws Exception{
42.
43. List<Persion> list = null;
44.
45. Persion persion = null;
46.
47. XmlPullParser parser = Xml.newPullParser();
48.
49. parser.setInput(is, "UTF-8");
50.
51. int event = parser.getEventType();
52.
53. while(event != XmlPullParser.END_DOCUMENT){
54.
55. switch (event){
56.
57. case XmlPullParser.START_DOCUMENT:
58.
59. list = new ArrayList<Persion>();
60.
61. break;
62.
63. case XmlPullParser.START_TAG:
64.
65. if("person".equals(parser.getName())){//得到指针所指向的节点名称
66.
67. int id = Integer.parseInt(parser.getAttributeValue(0));
68.
69. persion = new Persion();
70.
71. persion.setId(id);
72.
73. }
74.
75. if(persion != null){
76.
77. if("name".equals(parser.getName())){
78.
79. String name = parser.nextText();
80.
81. persion.setName(name);
82.
83. }else if("age".equals(parser.getName())){
84.
85. String age = parser.nextText();
86.
87. persion.setName(age);
88.
89. }
90.
91. }
92.
93. break;
94.
95. case XmlPullParser.END_TAG:
96.
97. if("person".equals(parser.getName())){
98.
99. list.add(persion);
100.
101. persion = null;
102.
103. }
104.
105. break;
106.
107. default:
108.
109. break;
110.
111. }
112.
113. }
114.
115. event = parser.next();
116.
117. return list;
118.
119. }
120.
121.
122.
123. public static void save(List<Persion> list,OutputStream os) throws IllegalArgumentException, IllegalStateException, IOException{
124.
125. XmlSerializer serializer = Xml.newSerializer();
126.
127. serializer.setOutput(os, "UTF-8");
128.
129. serializer.startDocument("UTF-8", true);
130.
131. serializer.startTag(null, "persons");
132.
133. for(Persion persion : list){
134.
135. serializer.startTag(null, "person");
136.
137. serializer.attribute(null, "id", String.valueOf(persion.getId()));
138.
139. serializer.startTag(null, "name");
140.
141. serializer.text(persion.getName());
142.
143. serializer.endTag(null, "name");
144.
145.
146.
147. serializer.startTag(null, "age");
148.
149. serializer.text(String.valueOf(persion.getAge()));
150.
151. serializer.endTag(null, "age");
152.
153. serializer.endTag(null, "person");
154.
155. }
156.
157. serializer.endTag(null, "persons");
158.
159. serializer.endDocument();
160.
161. os.flush();
162.
163. os.close();
164.
165. }
166.
167.}
168.复制打印
169.package com.cn.service;
170.
171.import java.io.IOException;
172.import java.io.InputStream;
173.import java.io.OutputStream;
174.import java.util.ArrayList;
175.import java.util.List;
176.
177.import org.xmlpull.v1.XmlPullParser;
178.import org.xmlpull.v1.XmlSerializer;
179.
180.import android.util.Xml;
181.
182.import com.cn.domain.Persion;
183./****
184.* 采用Pull解析XML
185.*
186.* ****/
187.public class PULLPersionService {
188.
189. public static List<Persion> getPersino(InputStream is)throws Exception{
190. List<Persion> list = null;
191. Persion persion = null;
192. XmlPullParser parser = Xml.newPullParser();
193. parser.setInput(is, "UTF-8");
194. int event = parser.getEventType();
195. while(event != XmlPullParser.END_DOCUMENT){
196. switch (event){
197. case XmlPullParser.START_DOCUMENT:
198. list = new ArrayList<Persion>();
199. break;
200. case XmlPullParser.START_TAG:
201. if("person".equals(parser.getName())){//得到指针所指向的节点名称
202. int id = Integer.parseInt(parser.getAttributeValue(0));
203. persion = new Persion();
204. persion.setId(id);
205. }
206. if(persion != null){
207. if("name".equals(parser.getName())){
208. String name = parser.nextText();
209. persion.setName(name);
210. }else if("age".equals(parser.getName())){
211. String age = parser.nextText();
212. persion.setName(age);
213. }
214. }
215. break;
216. case XmlPullParser.END_TAG:
217. if("person".equals(parser.getName())){
218. list.add(persion);
219. persion = null;
220. }
221. break;
222. default:
223. break;
224. }
225. }
226. event = parser.next();
227. return list;
228. }
229.
230. public static void save(List<Persion> list,OutputStream os) throws IllegalArgumentException, IllegalStateException, IOException{
231. XmlSerializer serializer = Xml.newSerializer();
232. serializer.setOutput(os, "UTF-8");
233. serializer.startDocument("UTF-8", true);
234. serializer.startTag(null, "persons");
235. for(Persion persion : list){
236. serializer.startTag(null, "person");
237. serializer.attribute(null, "id", String.valueOf(persion.getId()));
238. serializer.startTag(null, "name");
239. serializer.text(persion.getName());
240. serializer.endTag(null, "name");
241.
242. serializer.startTag(null, "age");
243. serializer.text(String.valueOf(persion.getAge()));
244. serializer.endTag(null, "age");
245. serializer.endTag(null, "person");
246. }
247. serializer.endTag(null, "persons");
248. serializer.endDocument();
249. os.flush();
250. os.close();
251. }
252.}

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