如何使用改造2一起发送文件和其他参数 [英] how to use retrofit 2 to send file and other params together
问题描述
我正在寻找一个示例,如何将文件和其他参数一起发送到服务器.
I am looking for an example how could I send file and other params together to server.
我必须发送服务器JSON
I have to send server JSON which
{
"title": "title",
"file": "uploaded file instance",
"location": {
"lat": 48.8583,
"lng": 2.29232,
"place": "Eiffel Tower"
}
}
我该如何创建Retrofit来处理这种情况?
How could I create Retrofit to handle this case?
如果file是一个字符串,我知道如何处理.如果file是File对象,我不知道该怎么做.
If file is a string I know how to handle this. If file is File object I have no idea how to do this.
推荐答案
使用 gson
并为该位置创建模型类.
Use gson
and create a model class for the location.
在您的 build.gradle
中添加以下依赖项.
Add the following dependencies to your build.gradle
.
compile 'com.squareup.retrofit2:converter-gson:2.0.0'
compile 'com.google.code.gson:gson:2.5'
创建一个表示位置的模型.
Create a model to represent the location.
public class Location {
double lat;
double lng;
String location;
public Location(double lat, double lon, String place) {
this.lat = lat;
this.lon = long;
this.place = place;
}
}
如果有效负载字段的变量名与端点的实际所需名称不匹配,则需要添加注释 @SerializedName([expected name])
If the variable names for the payload fields don't match the actual required name for the endpoint you will need to add the annotation @SerializedName([expected name])
例如:
import com.google.gson.annotations.SerializedName;
public class Location {
@SerializedName("lat")
double latitude;
@SerializedName("lng")
double longitude;
@SerializedName("place")
String location;
public Location(double lat, double lon, String place) {
latitude = lat;
longitude = long;
location = place;
}
}
定义api接口.
public interface Api {
@POST("upload/")
@Multipart
Call<ResponseBody> uploadFile(@Part("title") RequestBody title,
@Part MultipartBody.Part imageFile,
@Part("location") Location location
);
}
创建一个 Retrofit
实例并调用api.
Create a Retrofit
instance and call the api.
File file;
// create retrofit instance
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("https://baseurl.com/api/")
.addConverterFactory(GsonConverterFactory.create())
.build();
// create api instance
Api api = retrofit.create(Api.class);
// create call object
Call<ResponseBody> uploadFileCall = api.uploadFile(
RequestBody.create(MediaType.parse("text/plain"), "title"),
MultipartBody.Part.createFormData(
"file",
file.getName(),
RequestBody.create(MediaType.parse("image"), file)),
new Location(48.8583, 2.29232, "Eiffel Tower"));
// sync call
try {
ResponseBody responseBody = uploadFileCall.execute().body();
} catch (IOException e) {
e.printStackTrace();
}
// async call
uploadFileCall.enqueue(new Callback<ResponseBody>() {
@Override
public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
if (response.isSuccessful()) {
// TODO
}
}
@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
// TODO
}
});
如果不使用图像文件,则需要更改 MediaType.parse()
调用.
You will need to change the MediaType.parse()
call if you are not using an image file.
您可以类似地创建自定义响应类型对象,并用它替换 ResponseBody
以接收反序列化的结果对象.
You can similarly create a custom response type object and replace ResponseBody
with it to receive a deserialized result object.
让我知道这是否可行.我显然没有机会在您的实际情况下进行测试,但我相当有信心这应该可行.我不是100%感兴趣的唯一部分是 @Part("location")位置位置
是否应为 @Body("location")位置位置
Let me know if this works. I didn't have a chance to test in your exact scenario obviously but I'm fairly confident this should work. The only part I'm not 100% on is whether @Part("location") Location location
should be @Body("location") Location location
这篇关于如何使用改造2一起发送文件和其他参数的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!