Retrofit 实现上传下载文件

1.创建上传接口

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public interface FileWebService {

 

    @Multipart

    @POST("/files")

    FileUploadedResponse upload(@Part("fileContent") TypedFile file);

 

}

2.调用上传

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Filefile = // create your File object here

RestAdapterrestAdapter = // create your RestAdapter

StringmimeType = "image/jpg";

TypedFilefileToSend = new TypedFile(mimeType,file);

FileWebService fileWebService = restAdapter.create(FileWebService.class);

fileWebService.upload(fileToSend);

3.创建下载接口

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public interface FileWebService{

    @GET("/files/{fileId}")

    @Headers({"Content-Type: image/jpeg"})

    Response getFile(@Path("fileId") int fileId);

 

}

4.调用 

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int fileId = 123;

Response response = fileWebService.getFile(fileId);

byte[] bytes = FileHelper.getBytesFromStream(response.getBody().in());

 FileHelper.getBytesFromStream 代码如下:

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public static byte[] getBytesFromStream(InputStream is) throws IOException {

 

int len;

int size = 1024;

byte[] buf;

 

ByteArrayOutputStream bos = new ByteArrayOutputStream();

buf = new byte[size];

while((len = is.read(buf, 0, size)) != -1) {

bos.write(buf, 0, len);

}

buf = bos.toByteArray();

 

return buf;

}

 

保存到指定路径文件：

public static void saveBytesToFile(byte[] bytes,String path){try{FileOutputStreamfileOuputStream=newFileOutputStream(path);fileOuputStream.write(bytes);}catch(FileNotFoundExceptione){e.printStackTrace();}catch(IOExceptione){e.printStackTrace();}finally{         fileOuputStream.close();        }}

 

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