java - 通过REST接口(interface)以可下载文件的形式返回进程的输出和错误流

Question

创建执行流程的REST端点并将其stdout + stderr输出作为可下载文件提供的便捷方法是什么？

Answer 1

这是我最终使用的内容：

public ResponseEntity<StreamingResponseBody> example() throws IOException {
    Process p = new ProcessBuilder(/*...*/).redirectErrorStream(true).start();

    //better to use a static executor, but here I'm creating a new one every time
    Executors.newSingleThreadScheduledExecutor().schedule(() -> {
        if (p != null && p.isAlive()) {
            p.destroyForcibly(); //Destroy the process after a timeout period if it's still running
        }
    }, 10, TimeUnit.SECONDS);

    //No need to read err stream separately, it's redirected to stdout due to "redirectErrorStream"
    InputStream inputStream = p.getInputStream(); 

    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
    response.setHeader("Content-Disposition", "attachment; filename=foo.gz");

    return new ResponseEntity<>(new StreamingResponseBody() {
        @Override
        public void writeTo(OutputStream outputStream) throws IOException {
            try (GZIPOutputStream gzOut = new GZIPOutputStream(outputStream)) {
                while (p.isAlive()) {
                    inputStream.transferTo(gzOut);
                    gzOut.flush();
                }
            }
        }
    }, headers, HttpStatus.OK);
}