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> poiInfos;

private int totalHits;

public void setPoiInfos(List<PoiInfos> poiInfos) {
this.poiInfos = poiInfos;
}

public List<PoiInfos> 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<Location> pathPoints;

public double getPathLength(){

return pathLength;
}
public void setPathLength(){

this.pathLength=pathLength;

}

public List<Location> getPathPoints (){

return pathPoints;
}
public void setPathPoints (List<Location> 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<PoiInfos> locationList) {
Type type = new TypeToken<PoiGsonBean>() {
}.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<Location> LocationList) {

Type type = new TypeToken<PathInfos>() {
}.getType();
Gson gson = new Gson();
PathInfos pathInfos = gson.fromJson(strResult, type);
LocationList.addAll(pathInfos.getPathPoints());

}

}