​
private JSONObject executeApi(JSONObject jsonObject, String method) throws Exception {
        OkHttpClient client = OkHttpClientUtil.getInstance();
        String auth = systemCode + "-" + username + ":" + password;
        String authorizationHeader = StringPool.BASIC + new String(Base64Utils.encode(auth.getBytes()), StandardCharsets.UTF_8);
        MediaType mediaType = MediaType.get("application/json; charset=utf-8");
        RequestBody body = RequestBody.create(jsonObject.toString(), mediaType);

        Request request = new Request.Builder()
                .url("http://" + host + path + "&method=" + method)
                .addHeader(StringPool.AUTHORIZATION, authorizationHeader)
                .addHeader("Content-Type", "application/json")
                .post(body)
                .build();
        Call call = client.newCall(request);
        Response response = call.execute();
        if (response.isSuccessful() && response.body() != null) {
            return JSONObject.parseObject(response.body().string());
        }
        return new JSONObject();
    }

​

之前一直使用restTemplate请求，想换okhttp3试试，但接口一直返回“请求类型必须为“application/json”错误信息。
我试试body里设置导致下面Header没生效，没想到还真是。

private JSONObject executeApi(JSONObject jsonObject, String method) throws Exception {
        OkHttpClient client = OkHttpClientUtil.getInstance();
        String auth = systemCode + "-" + username + ":" + password;
        String authorizationHeader = StringPool.BASIC + new String(Base64Utils.encode(auth.getBytes()), StandardCharsets.UTF_8);
//        MediaType mediaType = MediaType.get("application/json; charset=utf-8");
        RequestBody body = RequestBody.create(jsonObject.toString(), null);

        Request request = new Request.Builder()
                .url("http://" + host + path + "&method=" + method)
                .addHeader(StringPool.AUTHORIZATION, authorizationHeader)
                .addHeader("Content-Type", "application/json")
                .post(body)
                .build();
        Call call = client.newCall(request);
        Response response = call.execute();
        if (response.isSuccessful() && response.body() != null) {
            return JSONObject.parseObject(response.body().string());
        }
        return new JSONObject();
    }