Swagger配置以便可以成功下载Excel

原文（python）：https://segmentfault.com/q/1010000014980947

点击swagger的下载按钮打开的excel出错

设置swagger的请求头的accept为application/octet-stream即可

java里面设置swagger注解里面的produces为application/octet-stream

@ApiOperation(value="测试",produces="application/octet-stream")