FormBody?requestBody?=?new?FormBody.Builder()
????????.add("username",user.getUserName())
????????.add("password",user.getPassWord())
????????.build();
Request.Builder?builder?=?new?Request.Builder();
final?Request?request?=?builder
????????.url(BaseUrl?+?"login")
????????.post(requestBody)
????????.build();
Call?call?=?okHttpClient.newCall(request);
Response?response?=?call.execute();
response.body().contentType();
String?res?=?response.body().string();