android retrofit2 如何多文件上传

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1、build.gradle中添加依赖

compile 'com.squareup.okhttp3:okhttp:3.4.1'
compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
compile 'com.google.code.gson:gson:2.5'
compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'

2、需实现的API接口类

public interface FileUpload {/*** 单文件上传* @param description* @param file @Part MultipartBody.Part file 使用MultipartBody.Part类发送文件file到服务器* @return 状态信息String*/@Multipart@POST("UploadServerAddr")Call<BaseResponse<String>> uploadFile(@Part("description") RequestBody description, @Part MultipartBody.Part file);/*** 多文件上传：通过 List<MultipartBody.Part> 传入多个part实现* @param parts 每一个part代表一个文件* @return 状态信息String*/@Multipart@POST("UploadServerAddr")Call<String>> uploadFilesMultipartBodyParts(@Part() List<MultipartBody.Part> parts);/*** 通过 MultipartBody和@body作为参数来实现多文件上传* @param multipartBody MultipartBody包含多个Part* @return 状态信息String*/@POST("UploadServerAddr")Call<String> uploadFilesMultipartBody(@Body MultipartBody multipartBody);
}

3、 创建OkHttpClient、Retrofit对象

public static final String BASE_URL = "http://×××/UploadFileServer/"; //Log应用拦截器                
HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);//创建OkHttpClient对象
OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor)  //okHttp的Log应用拦截器.retryOnConnectionFailure(true).connectTimeout(15, TimeUnit.SECONDS).build();//创建Retrofit               
Retrofit retrofit = new Retrofit.Builder() .client(client) //设置OKHttpClient   .baseUrl(BASE_URL)  //设置baseUrl, baseUrl必须后缀"/".addConverterFactory(GsonConverterFactory.create())  //添加Gson转换器.build();

4、获取、调用FileUpload的API函数实现单个文件或多文件上传

FileUpload fileUpload = retrofit.create(FileUpload.class); //获取FileUpload的API// 上传单一文件
String des = "a image";
RequestBody description = RequestBody.create( MediaType.parse("multipart/form-data"), des);RequestBody requestFile = RequestBody.create(MediaType.parse("text/plain"), new File("/sdcard/0/test.jpg"));
MultipartBody.Part body = MultipartBody.Part.createFormData("image", file.getName(), requestFile);Call<String> call = fileUpload.uploadFile(description, body);
call.enqueue(new Callback<String>() {@Overridepublic void onResponse(Call<String> call, Response<String> response) {}@Overridepublic void onFailure(Call<BaseResponse<String>> call, Throwable t) {}
});// 上传多文件，参数：List<MultipartBody.Part> parts对象
ArrayList<File> list = new ArrayList<File>();
list.add(new File("/sdcard/0/test0.jpg"));
list.add(new File("/sdcard/0/test1.jpg"));List<MultipartBody.Part> parts = new ArrayList<>(list.size());
for(File file : list) {RequestBody requestBody = RequestBody.create(MediaType.parse("image/png"), file);MultipartBody.Part part = MultipartBody.Part.createFormData("image", file.getName(), requestBody);parts.add(part);
}Call<String> call = fileUpload.uploadFilesMultipartBodyParts(parts);
call.enqueue(new Callback<String>() {@Overridepublic void onResponse(Call<String> call, Response<String> response) {}@Overridepublic void onFailure(Call<BaseResponse<String>> call, Throwable t) {}
});// 上传多文件，参数：MultipartBody对象
ArrayList<File> list = new ArrayList<File>();
list.add(new File("/sdcard/0/test0.jpg"));
list.add(new File("/sdcard/0/test1.jpg"));MultipartBody.Builder builder = new MultipartBody.Builder();
builder.setType(MultipartBody.FORM);
for(File file : list) {RequestBody requestBody = RequestBody.create(MediaType.parse("image/png"), file);builder.addFormDataPart("image", file.getName(), requestBody);
}
MultipartBody multipartBody = builder.build(); //List<MultipartBody.Part> parts = builder.build().parts();Call<String> call = fileUpload.uploadFilesMultipartBody(multipartBody);
call.enqueue(new Callback<String>() {@Overridepublic void onResponse(Call<String> call, Response<String> response) {}@Overridepublic void onFailure(Call<BaseResponse<String>> call, Throwable t) {}
});

 

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