XML读写

//*从本地解析*/
private List<Person> parserXmlFromLocal() {
try {

File path = new File(Environment.getExternalStorageDirectory(), "persons.xml");
FileInputStream fis = new FileInputStream(path);

// 获得pull解析器对象
XmlPullParser parser = Xml.newPullParser();
// 指定解析的文件和编码格式
parser.setInput(fis, "utf-8");

int eventType = parser.getEventType();      // 获得事件类型

List<Person> personList = null;
Person person = null;
String id;
while(eventType != XmlPullParser.END_DOCUMENT) {

String tagName = parser.getName();  // 获得当前节点的名称

switch (eventType) {
case XmlPullParser.START_TAG:       // 当前等于开始节点  <person>
if("persons".equals(tagName)) { // <persons>
personList = new ArrayList<Person>();
} else if("person".equals(tagName)) { // <person id="1">
person = new Person();
id = parser.getAttributeValue(null, "id");
person.setId(Integer.valueOf(id));
} else if("name".equals(tagName)) { // <name>
person.setName(parser.nextText());
} else if("age".equals(tagName)) { // <age>
person.setAge(Integer.parseInt(parser.nextText()));
}
break;
case XmlPullParser.END_TAG:     // </persons>
if("person".equals(tagName)) {
// 需要把上面设置好值的person对象添加到集合中
personList.add(person);
}
break;
default:
break;
}

eventType = parser.next();      // 获得下一个事件类型
}
return personList;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

/**
* 写xml文件到本地
*/
private void writeXmlToLocal() {
List<Person> personList = getPersonList();

// 获得序列化对象
XmlSerializer serializer = Xml.newSerializer();

try {
File path = new File(Environment.getExternalStorageDirectory(), "persons.xml");
FileOutputStream fos = new FileOutputStream(path);
// 指定序列化对象输出的位置和编码
serializer.setOutput(fos, "utf-8");

serializer.startDocument("utf-8", true);    // 写开始 <?xml version='1.0' encoding='utf-8' standalone='yes' ?>

serializer.startTag(null, "persons");       // <persons>

for (Person person : personList) {
// 开始写人
//serializer.startTag(arg0, arg1)
serializer.startTag(null, "person");    // <person>
serializer.attribute(null, "id", String.valueOf(person.getId()));

// 写名字
serializer.startTag(null, "name");      // <name>
serializer.text(person.getName());
serializer.endTag(null, "name");        // </name>

// 写年龄
serializer.startTag(null, "age");       // <age>
serializer.text(String.valueOf(person.getAge()));
serializer.endTag(null, "age");     // </age>

serializer.endTag(null, "person");  // </person>
}

serializer.endTag(null, "persons");         // </persons>

serializer.endDocument();       // 结束
} catch (Exception e) {
e.printStackTrace();
}

}