二开接口后端实现类中加入附件上传

建议使用附件上传接口方法：

AttachmentServerManager manager = AttachmentManagerFactory.getServerManager(ctx)

manager.addNewAttachmentContainCtx()

demo:

File fin=new File("D:/test/testtt.pdf");
FileInputStream in=new FileInputStream(fin);
//得到输入流
//InputStream inputStream = conn.getInputStream();
AttachmentServerManager manager = AttachmentManagerFactory.getServerManager(ctx);
ByteArrayOutputStream baot = new ByteArrayOutputStream();
byte[] bytes = new byte[1024]; //定义一个数组 用来读取
while((in.read(bytes)) != -1){
baot.write(bytes);