最近在做一個類似天氣預報的demo,資料是從http://wthrcdn.etouch.cn/weather_mini?city=獲取，但是解析出來的字串是亂碼，通常更換編碼型別就可以了，但是並不見效。所以最後才發現問題所在，這個介面的資料傳給客戶端的時候把資料壓縮了，所以當我們在客戶端獲取到資料後要給他解壓縮gzip即可，問題就解決了，現在把程式碼貼出來。

// 獲取天氣預報
	public void getWeatherByHttp(String city) {
		String url = Constants.GETWEATHER;
		ArrayList<NameValuePair> params = new ArrayList<NameValuePair>();
		params.add(new BasicNameValuePair("city", city));
		String param = URLEncodedUtils.format(params, "utf-8");
		HttpGet httpGet = new HttpGet(url + param);
		HttpClient httpClient = new DefaultHttpClient();
		try {
			HttpResponse httpResponse = httpClient.execute(httpGet);
			String result = getJsonStringFromGZIP(httpResponse);// 獲取到解壓縮之後的字串
			Log.i("result", result);

			JSONObject obj = new JSONObject(result);
			if (obj != null && obj.getString("desc").equals("OK")) {
				String str = obj.getString("data");
				WeatherModel model = new Gson().fromJson(str,
						WeatherModel.class);
				handler.sendMessage(handler
						.obtainMessage(GETWEATHERDATA, model));
			} else {
				handler.sendMessage(handler.obtainMessage(GETWEATHERDATA,
						obj.getString("desc")));
			}

		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	private String getJsonStringFromGZIP(HttpResponse response) {
		String jsonString = null;
		try {
			InputStream is = response.getEntity().getContent();
			BufferedInputStream bis = new BufferedInputStream(is);
			bis.mark(2);
			// 取前兩個位元組
			byte[] header = new byte[2];
			int result = bis.read(header);
			// reset輸入流到開始位置
			bis.reset();
			// 判斷是否是GZIP格式
			int headerData = getShort(header);
			if (result != -1 && headerData == 0x1f8b) {
				is = new GZIPInputStream(bis);
			} else {
				is = bis;
			}
			InputStreamReader reader = new InputStreamReader(is, "utf-8");
			char[] data = new char[100];
			int readSize;
			StringBuffer sb = new StringBuffer();
			while ((readSize = reader.read(data)) > 0) {
				sb.append(data, 0, readSize);
			}
			jsonString = sb.toString();
			bis.close();
			reader.close();
		} catch (Exception e) {
			Log.e("HttpTask", e.toString(), e);
		}
		return jsonString;
	}

	private int getShort(byte[] data) {
		return (int) ((data[0] << 8) | data[1] & 0xFF);
	}