Android 学习心得(1)——pull解析器

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <students>
 3     <student id="1">
 4         <name>张MM</name>
 5         <gender>女</gender>
 6         <age>18</age>
 7     </student>
 8     <student id="2">
 9         <name>王GG</name>
10         <gender>男</gender>
11         <age>20</age>
12     </student>
13 </students>

 1 public class student {
 2     private Integer id;
 3     private String name;
 4     private String gender;
 5     private Integer age;
 6     public Integer getId() {
 7         return id;
 8     }
 9     public void setId(Integer id) {
10         this.id = id;
11     }
12     public String getName() {
13         return name;
14     }
15     public void setName(String name) {
16         this.name = name;
17     }
18     public String getGender() {
19         return gender;
20     }
21     public void setGender(String gender) {
22         this.gender = gender;
23     }
24     public Integer getAge() {
25         return age;
26     }
27     public void setAge(Integer age) {
28         this.age = age;
29     }
30     
31 }

 1 package com.bwl.service;
 2 
 3 import java.io.InputStream;
 4 import java.util.ArrayList;
 5 import java.util.List;
 6 
 7 import org.xmlpull.v1.XmlPullParser;
 8 import org.xmlpull.v1.XmlSerializer;
 9 
10 import com.bwl.pojo.student;
11 
12 import android.util.Xml;
13 
14 public class xmlService {
15 
16     public List<student> read(InputStream xml) throws Exception {
17         List<student> list = null;
18         student student = null;
19         XmlPullParser xmlPull = Xml.newPullParser();
20         xmlPull.setInput(xml, "UTF-8");// 设置解析值 （"路径","编码"）
21         int flag = xmlPull.getEventType();// 取得当前所指向的数据的事件类型
22         do {
23             switch (flag) {
24             case XmlPullParser.START_DOCUMENT:// xml文档开始节点 start document
25                 // 集合实例化
26                 list = new ArrayList<student>();
27                 break;
28             case XmlPullParser.START_TAG:// xml文档开始节点解析
29                 if ((xmlPull.getName()).equals("student")) {// 和节点内容进行比较
30                     int id = new Integer(xmlPull.getAttributeValue(0));// 获取节点的第一个属性值
31                     student = new student();
32                     student.setId(id);
33                 }
34                 if ((xmlPull.getName()).equals("name")) {
35                     String name=xmlPull.nextText();// 取得节点的下一个Text节点
36                     student.setName(name);
37                 }
38                 if ((xmlPull.getName()).equals("gender")) {
39                     String gender=xmlPull.nextText();
40                     student.setGender(gender);
41                 }
42                 if ((xmlPull.getName()).equals("age")) {
43                     int age=new Integer(xmlPull.nextText());
44                     student.setAge(age);
45                 }
46                 break;
47             case XmlPullParser.END_TAG:// xml结束节点 end document
48                 if (xmlPull.getName().equals("student")) {// 节点结束判断
49                     list.add(student);// student添加到list集合中
50                     student = null;// student置为空
51                 }
52                 break;
53             }
54             flag = xmlPull.next();// 指向下一个节点
55         } while (flag != XmlPullParser.END_DOCUMENT); // 执行到END DOCUMENT节点文档结束
56         xml.close();
57         return list;
58     }
59 
60     public void write(List<student> list) throws Exception {
61         XmlSerializer xmlSerializer = Xml.newSerializer();
62         if (list != null) {
63             xmlSerializer.startDocument("UTF-8", true);//添加statrt docunment事件
64             xmlSerializer.startTag("", "students");//添加节点，参数（命名空间，节点名称）不使用命名空间的话可以使用""代替
65             for (student student : list) {
66                 xmlSerializer.setProperty("", "student");
67                 xmlSerializer.attribute("", "id", student.getId().toString());//定义student节点胡属性参数：（命名空间，属性名，属性值）
68                 xmlSerializer.setProperty("", "name");
69                 xmlSerializer.text(student.getName());
70                 xmlSerializer.endTag("", "student");//节点结束标记
71                 xmlSerializer.setProperty("", "gender");
72                 xmlSerializer.text(student.getGender());
73                 xmlSerializer.endTag("", "gender");
74                 xmlSerializer.setProperty("", "age");
75                 xmlSerializer.text(student.getAge().toString());
76                 xmlSerializer.endTag("", "age");
77                 xmlSerializer.endTag("", "student");
78             }
79             xmlSerializer.endDocument();//添加END DOCUMENT事件
80 
81         }
82     }
83 
84 }