萌新求教 Java 转码问题

现在有一个导出文本文件后，文本文件能用 GBK 编码打开的需求，但是原来的代码是这样的

InputStream inputStream = minioUtil.getObject(minioConfig.getBucketName(), fileVersion.getFsId()); 

然后设置响应体的文件类型和响应头

response.setContentType(contentType); response.setHeader("Content-Disposition", "attachment;filename=\"" + fileName + "\""); response.setHeader("Content-Length", "" + length); response.setHeader("fileName", "" + fileName); 

然后通过这个工具类去把 inputstream 流到 outputstream

IOUtils.copy(inputStream, outputStream); 

我的想法一开始是用

Reader r = new InputStreamReader(inputStream,"utf-8"); BufferedReader br = new BufferedReader(r); Writer w = new OutputStreamWriter(outputStream,"GBK"); BufferedWriter bw = new BufferedWriter(w); String s = null; while((s= br.readLine())!=null){ bw.write(s); } br.close(); bw.close(); 

发现导出不了，发送的请求是 pending ，然后过了两分钟响应 200 ，弹不出文件保存框。 然后尝试用这个

byte[] buffer = new byte[8192]; int n; byte[] dest = new byte[8192]; while(-1 != (n = inputStream.read(buffer))) { dest=new String(buffer,0,n,"UTF-8").getBytes("GBK"); outputStream.write(dest); } 

也失败，发送请求 pending ，响应是 504 Gateway Time-out nginx ，弹不出文件保存框。