Android使用OkHttp post 键值对

以前用的是原生的httpClient，但是有很多问题，比如重连机制啊，超时处理，等等，都需要自己写，而自己写又写不那么完善。

square开源的OkHttp很多人都在用，我试了下确实很不错，以后就打算用这个。

官网：http://square.github.io/okhttp/

注意，需要它需要okio包支持：https://github.com/square/okio

官方帮助文档：https://github.com/square/okhttp/wiki/Recipes

这里就简单的记录下它的Post用法：

第一种是需要在线程里运行的：

    public String postKeyValue(String actionType, String jsonString, String url) throws HttpException, IOException {
        String result = null;
        FormEncodingBuilder formEncodingBuilder = new FormEncodingBuilder();
        addCommonData(formEncodingBuilder);
        formEncodingBuilder.add("actionType", actionType);
        formEncodingBuilder.add(Value.JSON_STR, jsonString);

        RequestBody formBody = formEncodingBuilder.build();
        Request request = new Request.Builder()
                .url(url)
                .post(formBody)
                .build();

        Response response = okHttpClient.newCall(request).execute();
        
        if (response.isSuccessful()){
            result = response.body().string();
        }else {
            throw new IOException("Unexpected code " + response); 
        }
        
        return result;
    }

第二种是直接请求成功后给回调的：

    public void postKeyValue(String actionType, String jsonString, String url) throws HttpException, IOException {
        FormEncodingBuilder formEncodingBuilder = new FormEncodingBuilder();
        addCommonData(formEncodingBuilder);
        formEncodingBuilder.add("actionType", actionType);
        formEncodingBuilder.add(Value.JSON_STR, jsonString);

        RequestBody formBody = formEncodingBuilder.build();
        Request request = new Request.Builder()
                .url(url)
                .post(formBody)
                .build();

        Call call = okHttpClient.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Request request, IOException e) {
            }

            @Override
            public void onResponse(final Response response) throws IOException {
                if (response.isSuccessful()) {
                    String result = response.body().string();
                } else {
                    throw new IOException("Unexpected code " + response);
                }
            }
        });
        
    }