Retrofit 实现上传下载文件

张拭心 shixinzhang

发布于 2022-11-30 16:49:48

5080

发布于 2022-11-30 16:49:48

1.创建上传接口

1 2 3 4 5 6 7	public interface FileWebService { @ Multipart @ POST ( "/files" ) FileUploadedResponse upload ( @ Part ( "fileContent" ) TypedFile file ) ; }

2.调用上传

1 2 3 4 5 6	File file = // create your File object here RestAdapter restAdapter = // create your RestAdapter String mimeType = "image/jpg" ; TypedFile fileToSend = new TypedFile ( mimeType , file ) ; FileWebService fileWebService = restAdapter . create ( FileWebService . class ) ; fileWebService . upload ( fileToSend ) ;

3.创建下载接口

1 2 3 4 5 6	public interface FileWebService { @ GET ( "/files/{fileId}" ) @ Headers ( { "Content-Type: image/jpeg" } ) Response getFile ( @ Path ( "fileId" ) int fileId ) ; }

4.调用

1 2 3	int fileId = 123 ; Response response = fileWebService . getFile ( fileId ) ; byte [ ] bytes = FileHelper . getBytesFromStream ( response . getBody ( ) . in ( ) ) ;

FileHelper.getBytesFromStream 代码如下:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15	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);
f	ileOuputStream.write(bytes);
}catch(FileNotFoundExceptione){
	e.printStackTrace();
}catch(IOExceptione){
	e.printStackTrace();
}finally{
         fileOuputStream.close();
        }
}

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原始发表：2015-05-13，如有侵权请联系 cloudcommunity@tencent.com 删除

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