利用Pull生成和解析xml文件

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解析xml的方式有很多，可以用dom,sax解析，但是在android平台上最常用是Pull解析，下面是简单的示例

<?xmlversion="1.0" encoding="UTF-8"?><persons>  <person id=“18">  <name>allen</name>  <age>36</age>  </person>  <person id=“28">  <name>james</name>  <age>25</age>  </person></persons>

javabean类

public class Person {private Integer id;private String name;private Short age;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Short getAge() {return age;}public void setAge(Short age) {this.age = age;}}

生成xml文件

public static String writeXML(List<Person> persons, Writer writer){    XmlSerializer serializer = Xml.newSerializer();    try {        serializer.setOutput(writer);        serializer.startDocument("UTF-8", true);        //第一个参数为命名空间,如果不使用命名空间,可以设置为null        serializer.startTag("", "persons");        for (Person person : persons){            serializer.startTag("", "person");            serializer.attribute("", "id", person.getId().toString());            serializer.startTag("", "name");            serializer.text(person.getName());            serializer.endTag("", "name");            serializer.startTag("", "age");            serializer.text(person.getAge().toString());            serializer.endTag("", "age");            serializer.endTag("", "person");        }        serializer.endTag("", "persons");        serializer.endDocument();        return writer.toString();    } catch (Exception e) {        e.printStackTrace();    }    return null;}

解析xml文件

public static List<Person> readXML(InputStream inStream) {XmlPullParser parser = Xml.newPullParser();try {parser.setInput(inStream, "UTF-8");int eventType = parser.getEventType();Person currentPerson = null;List<Person> persons = null;while (eventType != XmlPullParser.END_DOCUMENT) {switch (eventType) {case XmlPullParser.START_DOCUMENT://文档开始事件,可以进行数据初始化处理persons = new ArrayList<Person>();break;case XmlPullParser.START_TAG://开始元素事件String name = parser.getName();if (name.equalsIgnoreCase("person")) {currentPerson = new Person();currentPerson.setId(new Integer(parser.getAttributeValue(null, "id")));} else if (currentPerson != null) {if (name.equalsIgnoreCase("name")) {currentPerson.setName(parser.nextText());// 如果后面是Text节点,即返回它的值} else if (name.equalsIgnoreCase("age")) {currentPerson.setAge(new Short(parser.nextText()));}}break;case XmlPullParser.END_TAG://结束元素事件if (parser.getName().equalsIgnoreCase("person") && currentPerson != null) {persons.add(currentPerson);currentPerson = null;}break;}eventType = parser.next();}inStream.close();return persons;} catch (Exception e) {e.printStackTrace();}return null;}

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