xml的序列化和反序列化

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xml的序列化

第一种方法 Stringbuffer

StringBuffer sb = new StringBuffer();

sb.append("<?xml version=\"1.0\"encoding=\"utf-8\"?>");

sb.append("<persons>");

for (int i = 0; i <persons.size(); i++) {

sb.append("<person>");

sb.append("<name>");

sb.append(persons.get(i).getName());

sb.append("</name>");

sb.append("<age>");

sb.append(persons.get(i).getAge());

sb.append("</age>");

sb.append("</person>");

}

sb.append("</persons>");

String xml =sb.toString();

try {

FileOutputStream fos = openFileOutput("person.xml",MODE_PRIVATE);

fos.write(xml.getBytes());

fos.close();

第二种方法:Xmlserlizer

public void create(View v){

try {

List<PersonInfo>infos = new ArrayList<PersonInfo>();

infos.add(newPersonInfo(1, "冠希哥", 32));

infos.add(newPersonInfo(2, "霆锋", 32));

//把对象集合变成xml

//xml序列化器

XmlSerializer serializer = Xml.newSerializer();//使用接口去接收一个真实的对象

FileOutputStream os = openFileOutput("persons.xml",Context.MODE_PRIVATE);

serializer.setOutput(os,"utf-8");//指定数据输出的路径

serializer.startDocument("utf-8",true);//文档的开始

serializer.startTag(null,"persons");//标签的开始

for(PersonInfo info:infos){

serializer.startTag(null,"person");

serializer.attribute(null,"id", info.id+"");//属性

//name

serializer.startTag(null,"name");

serializer.text(info.name);//文本节点

serializer.endTag(null,"name");

//age

serializer.startTag(null,"age");

serializer.text(info.age+"");

serializer.endTag(null,"age");

serializer.endTag(null,"person");

}

serializer.endTag(null, "persons");//标签的结束

serializer.endDocument();//文档的结束

os.close();//关流

} catch (Exception e) {

//TODO Auto-generated catch block

e.printStackTrace();

}

xml文件反序列化

publicvoid parse(View v){

List<PersonInfo> infos = null;

PersonInfo info = null;

try {

//获取解析器

XmlPullParser parser = Xml.newPullParser();

FileInputStreaminputStream = openFileInput("persons.xml");

parser.setInput(inputStream,"utf-8");//把流设置给解析器

inteventType = parser.getEventType();//获取事件类型

while(eventType!= XmlPullParser.END_DOCUMENT){//判断是否解析到了文档的结尾

switch (eventType) {

case XmlPullParser.START_TAG://标签的开始

if("persons".equals(parser.getName())){//获取当前标签的名称

infos = newArrayList<PersonInfo>();

}elseif("person".equals(parser.getName())){

info = new PersonInfo();

int id = Integer.parseInt(parser.getAttributeValue(0));//获取属性

info.id = id;

}elseif("name".equals(parser.getName())){

String name = parser.nextText();//获取下一个文本节点的值

info.name = name;

}elseif("age".equals(parser.getName())){

int age =Integer.parseInt(parser.nextText());

info.age = age;

}

break;

case XmlPullParser.END_TAG://标签的结束

if("person".equals(parser.getName())){

infos.add(info);

info = null;

}

break;

default:

break;

}

//继续往下解析

eventType = parser.next();

}

//打印日志

for(PersonInfopersonInfo:infos){

Log.i(TAG, personInfo.toString());

}

} catch (Exception e) {

//TODO Auto-generated catch block

e.printStackTrace();

}

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