android 网络请求+json解析最优分析

最近在项目中使用到了网络请求，网页数据以 json的方式返回，所以也避免不了json解析。众所周知，android为防止UI 阻塞，所以耗时操作时候都需要用户异步的方式处理。虽然进行了异步处理，但是速度上还是应该尽可能快。最后分析得出–HttpURLConnection+GSON解析最优。

一：网络请求 httpClient or HttpURLConnection

在Android 2.3及以上版本，使用的是HttpURLConnection，而在Android2.2及以下版本，使用的是HttpClient。至于为什么新版本为什么不推荐使用，则是谷歌对其不怎么更新，支持不太高。
HttpURLConnection是一种多用途、轻量极的HTTP客户端，使用它来进行HTTP操作可以适用于大多数的应用程序。虽然HttpURLConnection的API提供的比较简单，但是同时这也使得我们可以更加容易地去使用和扩展它。
但是如果不是简单网页，比如需要登录后与服务器保持连接的话，还是推荐使用httpClient，通过set-cookies方式。

这些都是比较书面化的定义，在实际的项目中测试了一下速度。httpURLConnect会更快一些，毕竟是读取字节流的方式读取json信息。

    // httpClient Get    public static String connServerResult(String strUrl) {        // 请求服务器的URL地址        // 返回数据转换成String        HttpGet httpRequest = new HttpGet(strUrl);        String strResult = null;        try {            HttpClient httpClient = new DefaultHttpClient();            HttpResponse httpResponse = httpClient.execute(httpRequest);            int code = httpResponse.getStatusLine().getStatusCode();            if (code == HttpStatus.SC_OK) {                Log.v("lzw", "PoiSearch-connServerResult-1");                strResult = EntityUtils.toString(httpResponse.getEntity());            }        } catch (Exception e) {        }        return strResult;    }//httpURlConnect  采用回调方式处理异步事件public static void getHttpResponse(final String allConfigUrl) {        new Thread(new Runnable() {            public void run() {                BufferedReader in = null;                StringBuffer result = null;                HttpURLConnection connection = null;                try {                    URL url = new URL(allConfigUrl);                    connection = (HttpURLConnection) url.openConnection();                    connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");                    connection.setRequestProperty("Charset", "utf-8");                    if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {                        result = new StringBuffer();                        // 读取URL的响应                        in = new BufferedReader(new InputStreamReader(connection.getInputStream()));                        String line;                        while ((line = in.readLine()) != null) {                            result.append(line);                        }                        Message msg_navigation = mHandler.obtainMessage();                        msg_navigation.what = 0;                        msg_navigation.obj = result.toString();                        mHandler.sendMessage(msg_navigation);                    }                } catch (Exception e) {                    e.printStackTrace();                } finally {                    try {                        if (connection != null) {                            connection.disconnect();                            connection = null;                        }                        if (in != null) {                            in.close();                            in = null;                        }                    } catch (Exception e2) {                        e2.printStackTrace();                    }                }            }        }).start();    }    //执行回调函数，处理异步事件。    public static void doHttpUtilsCallBaockListener(final HttpUtilsCallbackListener listener) {        mHandler = new Handler() {            @Override            public void handleMessage(Message msg) {                super.handleMessage(msg);                switch (msg.what) {                case 0:                    String str = (String) msg.obj;                    listener.success(str);                    break;                default:                    break;                }            }        };    }    public interface HttpUtilsCallbackListener {        void success(String str);    }

 经过上面两种方式，对我请求的一个路径导航的网页，httpClient大概3385ms httpURLConncet 2025ms。同等情况下 httpURLConnect性能更优。

二. JSON解析。
测试一个北京到上海的路径导航API网页数据，大约json里面坐标数组几万个，此时良好的解析方式将会凸显出性能的优劣。
我在处理json解析的时候用到三种方式；

第一种传统android自带的解析方式，使用JSONObject 解析对象， JSONArray 解析数组。
第二种阿里巴巴开源提供的fastjson.
第三种谷歌提供的GSON。

实际在几万个数据的解析下谷歌GSON解析更胜一筹，领先fastjson 几秒，最慢也是自带的 JSONObject .
最后附上GSON解析相关类。fastjson 和传统JSONObject 将不再赘述。

//PoiGsonBean 类public class PoiGsonBean {    private List poiInfos;    private int totalHits;    public void setPoiInfos(List poiInfos) {        this.poiInfos = poiInfos;    }    public List getPoiInfos() {        return this.poiInfos;    }    public void setTotalHits(int totalHits) {        this.totalHits = totalHits;    }    public int getTotalHits() {        return this.totalHits;    }    public static class PoiInfos {        private String address;        private Location location;        private String name;        private int score;        private String telephone;        private String uid;        public void setAddress(String address) {            this.address = address;        }        public String getAddress() {            return this.address;        }        public void setLocation(Location location) {            this.location = location;        }        public Location getLocation() {            return this.location;        }        public void setName(String name) {            this.name = name;        }        public String getName() {            return this.name;        }        public void setScore(int score) {            this.score = score;        }        public int getScore() {            return this.score;        }        public void setTelephone(String telephone) {            this.telephone = telephone;        }        public String getTelephone() {            return this.telephone;        }        public void setUid(String uid) {            this.uid = uid;        }        public String getUid() {            return this.uid;        }    }    public class PathInfos {        public double pathLength;        public List pathPoints;        public double getPathLength(){            return pathLength;        }        public void setPathLength(){            this.pathLength=pathLength;        }        public List getPathPoints (){            return pathPoints;        }        public void setPathPoints (List pathPoints){            this.pathPoints=pathPoints;        }    }    public static class Location {        private double x;        private double y;        public void setX(double x) {            this.x = x;        }        public double getX() {            return this.x;        }        public void setY(double y) {            this.y = y;        }        public double getY() {            return this.y;        }    }    public static class Junction {        private double x;        private double y;        public void setX(double x) {            this.x = x;        }        public double getX() {            return this.x;        }        public void setY(double y) {            this.y = y;        }        public double getY() {            return this.y;        }    }}//json解析类public class JsonPara {    //解析POI     public void parsePOI(String strResult, ArrayList locationList) {        Type type = new TypeToken() {        }.getType();        Gson gson = new Gson();        PoiGsonBean poiGsonBean = gson.fromJson(strResult, type);        locationList.clear();        locationList.addAll(poiGsonBean.getPoiInfos());    }    //解析路径导航    public void parseNavigation(String strResult, ArrayList LocationList) {        Type type = new TypeToken() {        }.getType();        Gson gson = new Gson();        PathInfos pathInfos = gson.fromJson(strResult, type);        LocationList.addAll(pathInfos.getPathPoints());    }}

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