依赖

cn.hutool hutool-all 5.7.20

Controller

/**
     * TITLE 测试
     *
     * @author chunhelv
     * @date 2022/6/9 13:46
     * @version p1
     * @param vo Test
     * @description
     */
    @Operation(summary = "测试", method = "POST", description = "测试")
    @PostMapping(value = "/test")
    public void unpack(
            @Valid @RequestBody Vo vo,
            HttpServletRequest requests, HttpServletResponse response
    ) {
        log.info("xxx/test Vo ：{}" , vo.toString());
        testService.unpack(vo, response);
    }

service

public void unpack(Vo vo, HttpServletResponse response) {
	Test resVo = new Test();
    //生成文件名 eg:Local_V1.0.0_66666
    String name = "Local" + "_" + xxx.getVersion() + "_" + (int) ((Math.random() * 9 + 1) * 10000);
    //打包成.json文件
    try (OutputStream outputStream = response.getOutputStream()
    ) {
        JSONObject object = new JSONObject(resVo);
        String jsonStr = object.toString();
        byte[] bytes = jsonStr.getBytes(StandardCharsets.UTF_8);
        // 全文件类型（传什么文件返回什么文件流）
        response.setContentType("application/x-msdownload");
        response.setHeader("Content-Disposition", "attachment; filename=\"" + name + ".json" + "\"");
        response.setHeader("Accept-Ranges", "bytes");
        outputStream.write(bytes);
        // 将缓存区数据进行输出
        outputStream.flush();
    } catch (IOException e) {
        log.error("unpack error : ", e);
    }
}

运行

运行后进入swagger即可下载文件
http://localhost:8080/swagger-ui/index.html