DOM解析XML示例-优快云博客

本文介绍了一种使用DOM方法解析特定RSS源文件的方法，并详细解释了如何通过Android应用程序获取和展示香港天气信息。

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关于XML解析以前有说过不过那是SAX方式的今天说一下DOM方法

[序言]

1. 今天解析的目标是：香港天气rss 地址为：

http://202.140.96.134:8080/FS-RSS/ftpfile/local_weather.xml

现在的目标就是：定制化该目标的解析办法我们还是查看一下该地址的源文件具体方法：

现在贴其源文件：//注：为了阅读方便我加了一些“回车换行”源文件是没有这些的

<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0">
   <channel><title>HK Weather Today</title>
              <description>HK Weather Today</description>
              <item><title>HK Weather Today</title>
                  <pubDate>Wed, 24 Mar 2010 07:00:00 GMT</pubDate>
                  <description><![CDATA[Current Temperature = 22<br>Humidity = 96<br>UV Index = null<br>UV Intensity = null<br>Icon = SI<br><img src="img/SI.png" border="0"/> <br>]]>                </description>
         </item>
    </channel></rss>

下面叙述具体怎么解析：

1. 定义界面内有若干TextView 供显示结果用

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
	android:id="@+id/city"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
	android:id="@+id/time"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
	android:id="@+id/temp"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
	android:id="@+id/humidity"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
	android:id="@+id/uvIndex"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
	android:id="@+id/uvIntensity"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<ImageView  
	android:id="@+id/image"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>

2. 得到各个View 的实例

public void initialView(){
    	city = (TextView)findViewById(R.id.city);
    	time = (TextView)findViewById(R.id.time);
    	temp = (TextView)findViewById(R.id.temp);
    	hunidity = (TextView)findViewById(R.id.humidity);
    	uvIndex = (TextView)findViewById(R.id.uvIndex);
    	uvIntensity = (TextView)findViewById(R.id.uvIntensity);
    	image = (ImageView)findViewById(R.id.image);
    }

3. 定义目标InputStream

URL url = new URL(s);

URLConnection connection = url.openConnection();
		    
HttpURLConnection httpConnection = (HttpURLConnection)connection;

InputStream in = httpConnection.getInputStream(); 
int responseCode = httpConnection.getResponseCode();

4. 定于DocumentBuilder实例并解析目标

DocumentBuilderFactory dbfactory = DocumentBuilderFactory.newInstance();

DocumentBuilder db = dbfactory.newDocumentBuilder();

//解析目标
Document dom = db.parse(in);

5. 得到DocumentBuilder的所有Element

Element docEle = dom.getDocumentElement();

6. 得到docEle 的"channel"分支

NodeList nl = docEle.getElementsByTagName("channel");

7. 解析并得到自己关系的列

if (nl != null && nl.getLength() > 0) {
			        for (int i = 0 ; i < nl.getLength(); i++) {
			        	
			        	//得到某行数据
			        	Element entry = (Element)nl.item(i);
			          
			        	Element info = (Element)entry.getElementsByTagName("item").item(0);
			        	
			        	//从该行中取出目标  方法：键值 Key-Value
			        	Element eTitle = (Element)info.getElementsByTagName("title").item(0);
			        	Element eDay = (Element)info.getElementsByTagName("pubDate").item(0);
			        	Element eDescription = (Element)info.getElementsByTagName("description").item(0);
			        	
			        	//取出其内容
			        	String scity = eTitle.getFirstChild().getNodeValue();
			        	String stime = eDay.getFirstChild().getNodeValue();
			        	String sdescription = eDescription.getFirstChild().getNodeValue();
			        	
			        	//遍历目标 以指定字符分割 然后按顺序放入String[]
			        	String[] string = sdescription.split("<br>");
			        	
			        	String temporary = string[0];
			        	String tenp = temporary.split("=")[1];
			        	
			        	String humidity = string[1];
			        	String hum = humidity.split("=")[1];
			        	
			        	String uIndex = string[2];
			        	String uv_Index = uIndex.split("=")[1];
			        	
			        	String uIntensity = string[3];
			        	String uv_Intensity = uIntensity.split("=")[1];
			        	
			        	
			        	//String uIntensity = string[3];
			        	String icoName = string[5];
			        	
			        	String address = icoName.split(" ")[1];
			        	
			        	String address1 = address.split("=")[1];
			        	
			        	//去除两边的"\""
			        	String address2 = address1.replaceAll("\"", "");
			        	
			        	
			        	city.setText("地区："+scity);
			        	time.setText("时间："+stime);
			        	temp.setText("温度："+tenp);
			        	hunidity.setText("湿度："+hum);
			        	uvIndex.setText("紫外线指数："+uv_Index);
			        	uvIntensity.setText("紫外线强度："+uv_Intensity);
			        	image.setImageBitmap(queryImageByURI(ico_preface+address2));
			        }
			      }

8. 实话说具体怎么一步步解析的很难说大家自己看代码应该能理解具体做法：类似于：剥花生即：一层层剥直至露出里面的东西

9. 对了还有即：根据图片名字下载之然后显示之

public final static String ico_preface = "http://202.140.96.134:8080/FS-RSS/";

public Bitmap queryImageByURI(String iu){
    	try{
    		
			URL imgURL = new URL(iu);
			URLConnection conn = imgURL.openConnection();
			
			conn.connect();
			InputStream is = conn.getInputStream();
			
			BufferedInputStream bis = new BufferedInputStream(is);
			
			Bitmap bm = BitmapFactory.decodeStream(bis);
			
			bis.close();
			is.close();
			return bm;
		}catch(Exception e){
          return null;
		} 
    }

10. emulator 运行截图哦对了别忘了打开网络权限即：

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

XML解析-DOM