google天气预报实现

public  void get(String city) {
  StringBuffer sb = new StringBuffer();
  try {
   URL url = new URL("http://www.google.com/ig/api?hl=zh_cn&weather="+city);

   String s = null;
   sb = new StringBuffer();
   BufferedReader in = new BufferedReader(new InputStreamReader(url
     .openStream(),"gb2312"));
   while ((s = in.readLine()) != null) {
    sb.append(s);
   }
   
  readXML(sb.toString());
  } catch (MalformedURLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
 
 /解析xml文件
 public static String readXML(String str){
  DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
   StringBuffer stringBuffer = new StringBuffer();
  try {
   DocumentBuilder builder = builderFactory.newDocumentBuilder();
      StringReader sr = new StringReader(str);
      InputSource is = new InputSource(sr);
      Document doc = builder.parse(is);
      NodeList node = doc.getElementsByTagName("forecast_conditions");
      System.out.println(node.getLength());
      for (int i = 0; i <node.getLength(); i++) {
    stringBuffer.append(doc.getElementsByTagName("day_of_week").item(i).getAttributes().item(0).getNodeValue());
    stringBuffer.append(doc.getElementsByTagName("low").item(i).getAttributes().item(0).getNodeValue());
    stringBuffer.append(doc.getElementsByTagName("high").item(i).getAttributes().item(0).getNodeValue());
    stringBuffer.append(doc.getElementsByTagName("condition").item(i).getAttributes().item(0).getNodeValue());
    stringBuffer.append("< img src='http://www.google.com"+doc.getElementsByTagName("icon").item(i).getAttributes().item(0).getNodeValue()+"' />");
   }
     
  } catch (ParserConfigurationException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (SAXException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  return stringBuffer.toString();
 }