android http通信(一) 天气预报webservice

举例：从网络上下载图片

String urlpath="http://i2.sinaimg.cn/dy/dsgb/20083.jpg";
    	try {
			URL url=new URL(urlpath);
			
			HttpURLConnection con = (HttpURLConnection) url.openConnection();
			
			con.setConnectTimeout(6000);
			con.setRequestMethod("GET");
			
			if(con.getResponseCode()==200){
				byte[] imagebytes = readStreamtoBytes(con.getInputStream());
				
				File file =new File("pic.jpg");
				
				FileOutputStream fos =new FileOutputStream(file);
				fos.write(imagebytes);
				fos.close();
			}

 

public static byte[] readStreamtoBytes(InputStream instream) throws IOException{
    	
    	ByteArrayOutputStream outstream =new ByteArrayOutputStream();
    	
    	int len=-1;
    	byte[] b = new byte[1024];
		while((len = instream.read(b)) != -1){
    		 
			outstream.write(b, 0, len);
    	}
		 outstream.flush();
		 outstream.close();
		 instream.close();
		 
		 return outstream.toByteArray();
    	
    }

 访问天气API

/*
	 * 通过传递城市名称获得天气信息
	 * http://webservice.webxml.com.cn/WebServices/WeatherWS.asmx/
	 * getWeather?theCityCode=55&theUserID=
	 */
	public static String getWeatherMsgByCity(String cityName) {
		String url = "http://webservice.webxml.com.cn/WebServices/WeatherWS.asmx/getWeather";
		HttpPost request = new HttpPost(url);
		List<NameValuePair> params = new ArrayList<NameValuePair>();
		params.add(new BasicNameValuePair("theCityCode", cityName));
		params.add(new BasicNameValuePair("theUserID", ""));
		String result = null;
		try {
			UrlEncodedFormEntity entity = new UrlEncodedFormEntity(params,
					HTTP.UTF_8);

			request.setEntity(entity);

			HttpResponse response = new DefaultHttpClient().execute(request);

			if (response.getStatusLine().getStatusCode() == 200) {
				result = EntityUtils.toString(response.getEntity());
				return parse2(result);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

/*
	 * 使用ksoap，获得城市列表
	 */
	public static List<String> getCityList() {
		// 命名空间
		String serviceNamespace = "http://WebXml.com.cn/";
		// 请求URL
		String serviceURL = "http://webservice.webxml.com.cn/WebServices/WeatherWS.asmx";
		// 调用的方法
		String methodName = "getRegionProvince";
		// 实例化SoapObject对象
		SoapObject request = new SoapObject(serviceNamespace, methodName);
		// 获得序列化的Envelope
		SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
				SoapEnvelope.VER11);
		envelope.bodyOut = request;
		//
		envelope.encodingStyle = "UTF-8";
		(new MarshalBase64()).register(envelope);

		// Android传输对象
		AndroidHttpTransport ht = new AndroidHttpTransport(serviceURL);
		ht.debug = true;

		try {
			// 调用
			ht.call("http://WebXml.com.cn/getRegionProvince", envelope);
			if (envelope.getResponse() != null) {
				return parse(envelope.bodyIn.toString());
			}
		} catch (IOException e) {
			e.printStackTrace();
		} catch (XmlPullParserException e) {
			e.printStackTrace();
		}

		return null;
	}