XML解析-DOM

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>