springmvc实现文件下载

springmvc实现文件下载

使用springmvc实现文件下载有两种方式,都须要设置response的Content-Disposition为attachment;filename=test2.png前端

第一种能够直接向response的输出流中写入对应的文件流java

第二种可使用 ResponseEntity<byte[]>来向前端返回文件spring

1、使用response

@RestController
@RequestMapping("/download")
public class DownloadController {

    @RequestMapping("/d1")
    public ResultVo<String> downloadFile(HttpServletResponse response){

        String fileName="test.png";
        try {
            //获取页面输出流
            ServletOutputStream outputStream = response.getOutputStream();
            //读取文件
            byte[] bytes = FileUtils.readFileToByteArray(new File("D:\\my-study\\test2.png"));
            //向输出流写文件
            //写以前设置响应流以附件的形式打开返回值,这样能够保证前边打开文件出错时异常能够返回给前台
            response.setHeader("Content-Disposition","attachment;filename="+fileName);
            outputStream.write(bytes);
            outputStream.flush();
            outputStream.close();
            return ResultVoUtil.success("success");
        } catch (IOException e) {
            return ResultVoUtil.error(e);
        }

    }
}

推荐使用这种方式,这种方式能够以json形式给前台返回提示信息。json

2、使用ResponseEntity

@Controller
@RequestMapping("/download2")
public class DownloadController2 {

    private final static Logger logger= LoggerFactory.getLogger(CategoryDataController.class);


    @GetMapping("/d2")
    public ResponseEntity<byte[]> download2(){
        //获取文件对象
        try {
            byte[] bytes = FileUtils.readFileToByteArray(new File("D:\\my-study\\bill-admin\\test2.png"));
            HttpHeaders headers=new HttpHeaders();
            headers.set("Content-Disposition","attachment;filename=test2.png");
            ResponseEntity<byte[]> entity=new ResponseEntity<>(bytes,headers,HttpStatus.OK);
            return entity;
        } catch (IOException e) {
            logger.error("下载出错:",e);
            return null;
        }
    }
}
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