【移動應用開發(fā)技術】Android中怎么利用DOM解析XML

【移動應用開發(fā)技術】Android中怎么利用DOM解析XML

一．DOM解析方法介紹二、DOM解析步驟DocumentBuilderFactory

factory

=

DocumentBuilderFactory.newInstance();DocumentBuilder

builder

=

factory.newDocumentBuilder();Document

dom

=

builder.parse(inputStream);

Element

root

=

dom.getDocumentElement();

NodeList

items

=

root.getElementsByTagName("person");

(

i

=

0;

i

<

items.getLength();

i++==

(

j

=

0;

j

<

childNodes.getLength();

j++=

(node.getNodeType()

===三、DOM解析XML代碼<?xml

version="1.0"

encoding="UTF-8"?><persons>

<person

id="23">

<name>liming</name>

<age>30</age>

</person>

<person

id="20">

<name>lixiangmei</name>

<age>25</age>

</person></persons>

<Button

android:id="@+id/dom_button"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:layout_marginTop="@dimen/fab_margin"

android:gravity="center_horizontal"

android:text="@string/DOM"

/><TextView

android:id="@+id/text"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Hello

World!"

/>package

com.zhangmiao.analyzexmldemo;import

org.w3c.dom.Document;import

org.w3c.dom.Element;import

org.w3c.dom.Node;import

org.w3c.dom.NodeList;import

java.io.InputStream;import

java.util.ArrayList;import

java.util.List;import

javax.xml.parsers.DocumentBuilder;import

javax.xml.parsers.DocumentBuilderFactory;/**

*

Created

by

zhangmiao

on

2016/12/14.

*/public

class

AnalyzeDOM

{

public

static

List<Person>

readXML(InputStream

inputStream)

{

List<Person>

persons

=

new

ArrayList<>();

DocumentBuilderFactory

factory

=

DocumentBuilderFactory.newInstance();

try

{

DocumentBuilder

builder

=

factory.newDocumentBuilder();

Document

dom

=

builder.parse(inputStream);

Element

root

=

dom.getDocumentElement();

NodeList

items

=

root.getElementsByTagName("person");

for

(int

i

=

0;

i

<

items.getLength();

i++)

{

Person

person

=

new

Person();

Element

personNode

=

(Element)

items.item(i);

person.setId(new

Integer(personNode.getAttribute("id")));

NodeList

childNodes

=

personNode.getChildNodes();

for

(int

j

=

0;

j

<

childNodes.getLength();

j++)

{

Node

node

=

childNodes.item(j);

if

(node.getNodeType()

==

Node.ELEMENT_NODE)

{

Element

childNode

=

(Element)

node;

if

("name".equals(childNode.getNodeName()))

{

person.setName(childNode.getFirstChild().getNodeValue());

}

else

if

("age".equals(childNode.getNodeName()))

{

person.setAge(new

Short(childNode.getFirstChild().getNodeValue()));

}

}

}

persons.add(person);

}

inputStream.close();

}

catch

(Exception

e)

{

e.printStackTrace();

}

return

persons;

}

}package

com.zhangmiao.analyzexmldemo;import

android.os.Bundle;import

android.support.design.widget.FloatingActionButton;import

android.support.design.widget.Snackbar;import

android.support.v7.app.AppCompatActivity;import

android.support.v7.widget.Toolbar;import

android.util.Log;import

android.view.View;import

android.view.Menu;import

android.view.MenuItem;import

android.widget.Button;import

android.widget.TextView;import

org.xml.sax.InputSource;import

java.io.BufferedWriter;import

java.io.File;import

java.io.FileOutputStream;import

java.io.InputStream;import

java.io.OutputStreamWriter;import

java.io.StringWriter;import

java.util.List;import

javax.xml.parsers.SAXParser;import

javax.xml.parsers.SAXParserFactory;public

class

MainActivity

extends

AppCompatActivity

implements

View.OnClickListener

{

private

static

final

String

TAG

=

"AnalyzeXMLDemo";

private

TextView

mTextView;

private

InputStream

inputStream;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

Log.v(TAG,

"onCreate");

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Toolbar

toolbar

=

(Toolbar)

findViewById(R.id.toolbar);

setSupportActionBar(toolbar);

FloatingActionButton

fab

=

(FloatingActionButton)

findViewById(R.id.fab);

fab.setOnClickListener(new

View.OnClickListener()

{

@Override

public

void

onClick(View

view)

{

Snackbar.make(view,

"Replace

with

your

own

action",

Snackbar.LENGTH_LONG)

.setAction("Action",

null).show();

}

});

Button

domButton

=

(Button)

findViewById(R.id.dom_button);

mTextView

=

(TextView)

findViewById(R.id.text);

domButton.setOnClickListener(this);

}

@Override

public

void

onClick(View

v)

{

String

result

=

"";

inputStream

=

getResources().openRawResource(R.raw.itcase);

switch

(v.getId())

{case

R.id.dom_button:

result

+=

"

DOM

"

+

"\n";

if

(inputStream

==

null)

{

result

=

"inputStream

is

null";

}

else

{

List<Person>

personList

=

AnalyzeDOM.readXML(inputStream);

if

(personList

!=

null)

{

for

(int

i

=

0;

i

<

personList.size();

i++)

{

String

message

=

"id

=

"

+

personList.get(i).getId()

+

"

,

name

=

"

+

personList.get(i).getName()

+

"

,

age

=

"

+

personList.get(i).getAge()

+

".\n";

result

+=

message;

}

}

}

mTextView.setText(result);

break;default:

break;

}

}

@Override

public

boolean

onCreateOptionsMenu(Menu

m