使用pull解析器解析和生成xml文件

解析的xml文件如下 person.xml

<?xml version="1.0" encoding="utf-8"?>
<persons>
<person id="20">
<name>xiaoming</name>
<age>23</age>
</person>
<person  id="21">
<name>xiaoli</name>
<age>27</age>
</person>
</persons>

1.第一步 编写javaBean : Person.java

public class Person {
private String name;
private int age;
private int id;

public Person() {
}

public Person(String name, int age, int id) {
this.name = name;
this.age = age;
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

}

界面设计 直接展示布局：



读取XML和写入XML 功能实现

public class MainActivity extends AppCompatActivity {

Button bt_readxml,bt_writexml;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bt_readxml=(Button)findViewById(R.id.bt_readxml);
bt_writexml=(Button)findViewById(R.id.bt_writexml);
//读取XML
bt_readxml.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AssetManager assetManager= getRes
ae3b
ources().getAssets();
try {
InputStream xml=assetManager.open("person.xml");
List<Person> persons= PersonService.getPersons(xml);
for (Person person:persons){
Log.i("MainActivity","id:"+person.getId()+"   name:"+person.getName()+"   age:"+person.getAge());
}
}catch (Exception e){
e.printStackTrace();
}
}
});
//写入XML
bt_writexml.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
List<Person> persons=new ArrayList<Person>();
Person person1=new Person("lili",23,40);
Person person2=new Person("mimi",19,24);
persons.add(person1);
persons.add(person2);
File file=new File(getFilesDir(),"person.xml");
try {
FileOutputStream out = new FileOutputStream(file);
PersonService.savePersons(persons, out);
} catch (Exception e){
e.printStackTrace();
}
}
});
}
}

4.XML文件读取和写入的逻辑 PersonService.java如下：

public class PersonService {
/**
* 读取XML文件
* @param xml
* @return
* @throws Exception
*/
public static List<Person> getPersons(InputStream xml) throws Exception{
List<Person> persons=null;
XmlPullParser parser= Xml.newPullParser(); //得到PULL解析器
parser.setInput(xml,"UTF-8");//设置输入流的编码格式 UTF-8
Person person=null;
int event=parser.getEventType();
while (event!=XmlPullParser.END_DOCUMENT){
switch (event){
case XmlPullParser.START_DOCUMENT:
persons=new ArrayList<Person>();
break;
case XmlPullParser.START_TAG:
if("person".equals(parser.getName())){
int id =new Integer(parser.getAttributeValue(0));
person=new Person();
person.setId(id);
}
if("name".equals(parser.getName())){
String name=parser.nextText();
person.setName(name);
}
if("age".equals(parser.getName())){
int age=new Integer(parser.nextText());
person.setAge(age);
}
break;
case XmlPullParser.END_TAG:
if("person".equals(parser.getName())){
persons.add(person);
person=null;
}
break;
default:break;
}
event=parser.next();
}

return persons;
}

/**
* 写XML文件
* @param persons
* @param out
* @throws Exception
*/
public static void savePersons(List<Person> persons, OutputStream out) throws Exception{
XmlSerializer xml= Xml.newSerializer();
xml.setOutput(out,"UTF-8");
xml.startDocument("UTF-8",true);

xml.startTag(null,"Persons");
for(Person person:persons){
xml.startTag(null,"Person");
xml.attribute(null,"id",String.valueOf(person.getId()));

xml.startTag(null,"name");
xml.text(person.getName());
xml.endTag(null,"name");

xml.startTag(null,"age");
xml.text(Integer.toString(person.getAge()));
xml.endTag(null,"age");

xml.endTag(null,"Person");
}
xml.endTag(null,"Persons");
xml.endDocument();
out.flush();
out.close();
}
}