Android okhttp实现请求步骤；

    private static String testOkhttp(String url, HashMap headers, HashMap params){

        OkHttpClient client = new OkHttpClient();

        OkHttpClient.Builder builder = client.newBuilder();
        builder.connectTimeout(10, TimeUnit.SECONDS);
        builder.readTimeout(30,TimeUnit.SECONDS);
        builder.writeTimeout(30,TimeUnit.SECONDS);
        builder.hostnameVerifier(new HostnameVerifier() {
            @Override
            public boolean verify(String hostname, SSLSession session) {
                return true;
            }
        });

        builder.build();

        Request.Builder requestBuilder = new Request.Builder();

        requestBuilder.addHeader("Content-Type", "application/json; charset=utf-8");

        if (headers!=null){
            for (String s : headers.keySet()) {
                requestBuilder.addHeader(s,headers.get(s));
            }
        }
        if (params!=null){
            FormBody.Builder forbody=new FormBody.Builder();
            for (String s : params.keySet()) {
                forbody.add(s,params.get(s));
            }
            requestBuilder.post(forbody.build());
        }
        requestBuilder.url(url);

        Request request = requestBuilder.build();

        try {
            Response response = client.newCall(request).execute();
            if (response != null && response.code() == 200) {
                return response.body().string();
            }

        } catch (IOException e) {
            e.printStackTrace();
        }

        return "";
    }