Dom解析xml

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>