本文共 2876 字，大约阅读时间需要 9 分钟。

方法一

@RequestMapping("download")    public ResponseEntity
   
     download(String filePath, int id) throws IOException {
           client = dcf.createClient(WSDL_URL);        FileDecryptVo fileDecryptVo=null;        try {
               objects = client.invoke("getFileDecryptById", id);            String json = (String) objects[0];            fileDecryptVo = JSON.parseObject(json, FileDecryptVo.class);        } catch (Exception e) {
               e.printStackTrace();        }        assert fileDecryptVo != null;        String filepath =fileDecryptVo.getFilePath();        File file=new File(filepath);        String fileName=new String(filepath.split("\\\\")[2].getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1);        HttpHeaders headers = new HttpHeaders();        fileName=new String(fileName.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1);        headers.setContentDispositionFormData("attachment", fileName);        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);        return new ResponseEntity
    
     (FileUtils.readFileToByteArray(file),                headers, HttpStatus.CREATED);    }
    
   

方法二

@RequestMapping(value = "/download", method = RequestMethod.GET)    public void download(HttpServletResponse res, int id) {
           client = dcf.createClient(WSDL_URL);        FileDecryptVo fileDecryptVo = null;        try {
               objects = client.invoke("getFileDecryptById", id);            String json = (String) objects[0];            fileDecryptVo = JSON.parseObject(json, FileDecryptVo.class);        } catch (Exception e) {
               e.printStackTrace();        }        assert fileDecryptVo != null;        String filepath = fileDecryptVo.getFilePath();        res.setContentType(MediaType.TEXT_PLAIN_VALUE);        //UTF_8是项目编码，ISO_8859_1是浏览器默认编码。        String fileName = new String(filepath.split("\\\\")[2].getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1);        res.setHeader("Content-Disposition", "attachment;filename=" + fileName);        byte[] buff = new byte[2048];        BufferedInputStream bis = null;        BufferedOutputStream bos = null;        try {
               bis =new BufferedInputStream(new FileInputStream(new File(filepath))) ;            bos = new BufferedOutputStream(res.getOutputStream());            int readLength=0;            while ((readLength=bis.read(buff))!= -1) {
                   bos.write(buff, 0, readLength);                bos.flush();            }        } catch (IOException e) {
               e.printStackTrace();        } finally {
               try {
                   assert bis != null;                bis.close();                assert bos != null;                bos.close();            } catch (IOException e) {
                   e.printStackTrace();            }        }        System.out.println("success");    }

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