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Android OKHTTP的单例和再封装的实例

2017-07-31 09:23 781 查看

Android OKHTTP的单例和再封装的实例

/**
* Created by zm on 16-2-1
* okhttp的再封装,对于2.x版本，3.x版本将原有对okhttpclient配置
* 改成了builder模式配
* 置,对于超时、代理、dns，okhttp已经做好了配置，
* 若不需要特殊配置，可以跳过
*/
public class OkHttpUtil
{
private static OkHttpClient singleton;
//非常有必要，要不此类还是可以被new，但是无法避免反射，好恶心
private OkHttpUtil(){
}
public static OkHttpClient getInstance() {
if (singleton == null)
{
synchronized (OkHttpUtil.class)
{
if (singleton == null)
{
singleton = new OkHttpClient();
}
}
}
return singleton;
}
}

之前在看okhttp源码的时候，发现square没有对okhttpclient进行单例，网上也没找到合适的解释，以下是自己的猜测

优点：使用单例模式，避免了多次创建所产生的垃圾

缺点：对于一些特殊需求的代码进行一些灵活的配置，单例模式难以实现

总结：做为优秀的开源框架，square出发点是让用户更好更灵活的使用和扩展，从用户角度来说，对于不需要多次配置的项目，可以手动写一个单例模式，便于内存的高效利用

/**
* okhttp再次封装
* Created by zm on 16-2-1
* update by zm on 16-3-19 增加Builder，方便以后内容或者字段的扩展
*
*/
public class HttpTools
{
private Context context;
private final RequestParams req;
private final Handler handler;
public HttpTools(Builder builder)
{
// TODO Auto-generated constructor stub
context = builder.context;
req = builder.req;
handler = builder.handler;
}
public static class Builder
{
private final RequestParams req;
private final Context context;
private final Handler handler;
public Builder(RequestParams req, Context mContext, Handler handler)
{
// TODO Auto-generated constructor stub
this.req = req;
this.context = mContext;
this.handler = handler;
}
public HttpTools build() {
return new HttpTools(this);
}
}
public void requestBuilder() {
// TODO Auto-generated method stub
if(req==null||context==null||handler==null){
throw new NullPointerException("NullPointerException");
}
requestGet(req, context, handler);
}
private static void parse(Call call, final Handler handler,
final RequestParams req) {
// 请求加入调度
call.enqueue(new Callback()
{
@Override
public void onResponse(Call call, Response response)
throws IOException {
// TODO Auto-generated method stub
String result = response.body().string();
if (result != null)
{
Message message = Message.obtain();
message.obj = result;
message.what = req.getSuccessMsgWhat();
handler.sendMessage(message);
}
}
@Override
public void onFailure(Call call, IOException e) {
// TODO Auto-generated method stub
handler.sendEmptyMessage(req.getFailMsgWhat());
}
});
}
/**
*
* @param req
* @param context
* @param handler
*
*      get请求
*/
public static void requestGet(final RequestParams req,
final Context context, final Handler handler) {
// 创建一个Request
final Request request = new Request.Builder().url(req.getRequestUrl()).build();
Call call = OkHttpUtil.getInstance().newCall(request);
parse(call, handler, req);
}
/**
* post请求
*/
public static void requestPost(final RequestParams req,
final Context context, final Handler handler) {
FormBody.Builder builder = new FormBody.Builder();
//此处是对RequestParams的遍历，RequestParams类省略
for (Map.Entry<String, Object> mEntry : req.getParamEntry())
{
String mEntryKey = mEntry.getKey();
Object mEntryValue = mEntry.getValue();
if (TextUtils.isEmpty(mEntryKey))
{
continue;
}
builder.add(mEntryKey, mEntryValue.toString());
}
RequestBody body = builder.build();
Request request = new Request.Builder().url(req.getUrl()).post(body).build();
Call call = OkHttpUtil.getInstance().newCall(request);
parse(call, handler, req);
}
/**
*      数据请求的集中管理，方便以后一键替换，从get到post
*/
public static void request(RequestParams req, Context mContext,
Handler handler) {
// TODO Auto-generated method stub
requestGet(req, mContext, handler);
}
}

最后再奉献上一个封装类

/**
*
* Created by zm on 16-2-1
* 基于Gson的json转model封装类
*
*/
public class JsonToModel
{
private static String info = "info";
public static String getInfo()
{
return info;
}
public static void setInfo(String info)
{
JsonToModel.info = info;
}
/**
*
* @param msg
* @param t
*      model类
* @param model
*      model对象
* @return
*/
public static <T> List<T> getJsonArrayToModel(Message msg, Class<T> t,
T model) {
// TODO Auto-generated method stub
List<T> list = new ArrayList<T>();
try {
JSONObject json = new JSONObject(msg.obj.toString());
for (int i = 0; i < json.getJSONArray(getInfo()).length(); i++) {
model = GsonHelper.toType(json.getJSONArray(getInfo()).get(i).toString(), t);
list.add(model);
}
return list;
} catch (Exception e) {
// TODO Auto-generated catch block
Log.e("getJsonArrayToModel", "error");
e.printStackTrace();
}
return null;
}
}

json转model的这个类中，当时没考虑到过多性能的问题，在此类中即使用了org.json.JSONObject也使用了gson，此处还可以做出相应的优化

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