Android(安卓)json通信（解析）方法

下面是在做天气预报程序时用到的Json通信，解析方法，备份一下，下次找就方便了；

1、链接服务器获取json字符串：

public static String getJsonContent(String city) {String urlString="";try {urlString = URL + "&location=" + URLEncoder.encode(city, "UTF-8")+ "&ak=" + APP_KEY;} catch (UnsupportedEncodingException e1) {e1.printStackTrace();}try {// 获取HttpURLConnection连接对象URL url = new URL(urlString);HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();// 设置连接属性httpConn.setConnectTimeout(8000);httpConn.setDoInput(true);httpConn.setRequestMethod("GET");// 获取相应码int respCode = httpConn.getResponseCode();if (respCode == 200) {return ConvertStream2Json(httpConn.getInputStream());}} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return "";}

private static String ConvertStream2Json(InputStream inputStream) {String jsonStr = "";// ByteArrayOutputStream相当于内存输出流ByteArrayOutputStream out = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;// 将输入流转移到内存输出流中try {while ((len = inputStream.read(buffer, 0, buffer.length)) != -1) {out.write(buffer, 0, len);}// 将内存流转换为字符串jsonStr = new String(out.toByteArray());} catch (IOException e) {e.printStackTrace();}return jsonStr;}

2、解析Json字符串：
Json的解析无外乎Jsonobject、JsonArray，针对服务器返回的具体字符串进行解析，下面只是给了一个例子，例子对应的Json字符串如下：

result:{"error":0,"status":"success","date":"2014-07-30","results":[{"currentCity":"北京","pm25":"209","index":[{"title":"穿衣","zs":"热","tipt":"穿衣指数","des":"天气热，建议着短裙、短裤、短薄外套、T恤等夏季服装。"},{"title":"洗车","zs":"不宜","tipt":"洗车指数","des":"不宜洗车，路面积水较多，不宜擦洗汽车。如果执意擦洗，要做好溅上泥水的心理准备。"},{"title":"感冒","zs":"较易发","tipt":"感冒指数","des":"相对今天出现了较大幅度降温，较易发生感冒，体质较弱的朋友请注意适当防护。"},{"title":"运动","zs":"较适宜","tipt":"运动指数","des":"阴天，较适宜进行各种户内外运动。"},{"title":"紫外线强度","zs":"弱","tipt":"紫外线强度指数","des":"紫外线强度较弱，建议出门前涂擦SPF在12-15之间、PA+的防晒护肤品。"}],"weather_data":[{"date":"周三 07月30日 (实时：23℃)","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多云","wind":"微风","temperature":"29 ~ 24℃"},{"date":"周四","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/qing.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/qing.png","weather":"晴","wind":"微风","temperature":"31 ~ 24℃"},{"date":"周五","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多云","wind":"微风","temperature":"34 ~ 25℃"},{"date":"周六","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/qing.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/qing.png","weather":"晴","wind":"微风","temperature":"34 ~ 24℃"}]}]}

public static int getJsonResult(String result) {int resultError = 0;Map<String, String> reslutMap = new HashMap<String, String>();try {JSONObject jObject = new JSONObject(result);//返回错误码,0为正常，其他请查询状态表;resultError = Integer.valueOf(jObject.get("error").toString());//网络时间NET_DATE = jObject.get("date").toString();JSONArray jArray = new JSONArray(jObject.get("results").toString());JSONObject jaObject = jArray.getJSONObject(0);//当前城市NET_CITY = jaObject.get("currentCity").toString();NET_PM25 = jaObject.get("pm25").toString();//指数indexList.clear();JSONArray indexArray = new JSONArray(jaObject.get("index").toString());for (int i = 0; i < indexArray.length(); i++) {JSONObject indexObject = indexArray.getJSONObject(i);IndexEntity index = new IndexEntity();index.setTitle(indexObject.get("title").toString());index.setZs(indexObject.get("zs").toString());index.setTipt(indexObject.get("tipt").toString());index.setDes(indexObject.get("des").toString());indexList.add(index);}//天气weatherList.clear();JSONArray weatherArray = new JSONArray(jaObject.get("weather_data").toString());for (int i = 0; i < weatherArray.length(); i++) {JSONObject weatherObject = weatherArray.getJSONObject(i);WeatherEntity weather = new WeatherEntity();weather.setDate(weatherObject.get("date").toString());weather.setDayPictureUrl(weatherObject.get("dayPictureUrl").toString());weather.setNightPictureUrl(weatherObject.get("nightPictureUrl").toString());weather.setWeather(weatherObject.get("weather").toString());weather.setWind(weatherObject.get("wind").toString());weather.setTemperature(weatherObject.get("temperature").toString());weatherList.add(weather);}} catch (JSONException e) {e.printStackTrace();}return resultError;}

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