androidretrofit2 文件上传(一)

android retrofit2 文件上传

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>() { @Override public void onResponse(Call<String> call, Response<String> response) { } @Override public 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>() { @Override public void onResponse(Call<String> call, Response<String> response) { } @Override public 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>() { @Override public void onResponse(Call<String> call, Response<String> response) { } @Override public void onFailure(Call<BaseResponse<String>> call, Throwable t) { } });