android中的http通讯----（5）客户端解析xml文件

xml文件也是客户端和服务器之间进行数据传输的重要格式，本案例演示如何在客户端解析服务端发来的xml文件

首先，我们现在服务器端放置xml文件

注意如果是用MyEclipse做服务器端，一定要把xml文件放在WebContent目录下面

girl.xml文件如下：






客户端程序代码：主要要在AndroidManifest.xml文件里面添加权限：

<uses-permission android:name="android.permission.INTERNET"/>

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />



MainActivity.java

package com.example.xmlpage;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.TextView;<strong>

</strong>public class MainActivity extends Activity {
private TextView textView;
private Handler handler = new Handler();
private String Url;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);
init();
new XmlThread(Url,handler,textView).start();
}
public void init(){
Url = "http://192.168.1.118:8080/MyWebProject/girl.xml";
textView = (TextView)findViewById(R.id.textView);
}
}<span style="color:#3366ff;font-weight: bold;">
</span>

XmlThread.java

package com.example.xmlpage;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

import android.os.Handler;
import android.widget.TextView;

public class XmlThread extends Thread {
private String url;
private Handler handler;			//往handler发送消息
private TextView textView;			//往textView设置文本信息

public XmlThread(String url,Handler handler,TextView textView){
this.url = url;
this.handler = handler;
this.textView = textView;
}
@Override
public void run(){
try {
//1.得到url
URL httpUrl = new URL(url);
//2.得到HttpURLConnection
HttpURLConnection conn = (HttpURLConnection)httpUrl.openConnection();
//3.设置请求方式
conn.setRequestMethod("GET");
//4.设置超时
conn.setReadTimeout(5000);
//5.获得输入流
InputStream in = conn.getInputStream();
//6.解析xml文件，用android原生的pull方法，用XmlPullParserFactory拿到工厂对象
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
//7.拿到PullParser
XmlPullParser parser = factory.newPullParser();
//8.拿到parser之后，就可以对服务器返回的xml文件进行解析
parser.setInput(in, "UTF-8");
//9.XML解析是基于事件驱动的，首先定义事件类型
int eventType = parser.getEventType();

final List<Girls>list = new ArrayList<Girls>();
Girls girl = null;
//10.根据事件类型进行处理
while( eventType != XmlPullParser.END_DOCUMENT){
//获得标签的名字
String data =parser.getName();
switch(eventType){
case XmlPullParser.START_TAG:
if("girl".equals(data)){
girl = new Girls();
}
if("name".equals(data)){
girl.setName(parser.nextText());
}
if("age".equals(data)){
girl.setAge(Integer.parseInt(parser.nextText()));
}
if("school".equals(data)){
girl.setSchool(parser.nextText());
}
break;
case XmlPullParser.END_TAG:
if("girl".equals(data) && girl!= null){
list.add(girl);
}
break;
default:
break;
}
//手动的调用一下事件处理方法，否则一条走完之后，默认不会动
eventType = parser.next();
}

handler.post(new Runnable(){
@Override
public void run(){
//打印出list
textView.setText(list.toString());
}
});
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
}

Girls.java

package com.example.xmlpage;

public class Girls {
private String name;
private int age;
private String school;

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 String getSchool() {
return school;
}
public void setSchool(String school) {
this.school = school;
}

@Override
public String toString(){
return "[name=" + name
+"age="  + age
+"school=" + school
+"]";
}
}

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>

效果图：



我们看到客户端已经解析并显示xml文件的信息！