(spring boot)虚拟目录配置、文件下载

January 29, 2019

虚拟目录配置

....
//配置文件用于读取相关配置
file:
  #文件静态资源访问目录
  static-access-path: /fileManager/uploads/**
  #文件静态资源存储测试目录
  save-path-unix: ~/Documents/upload/
  save-path-windows: d://linyiUpload/
... 

//虚拟目录配置  
@Configuration
public class MVCConfig implements WebMvcConfigurer {

    /**
     * 文件临时存储目录(unix)
     */
    @Value("${file.save-path-unix}")
    private String rootPathUnix;
    /**
     * 文件临时存储目录(windows)
     */
    @Value("${file.save-path-windows}")
    private String rootPathWindows;

    /**
     * 文件存储路径
     */
    @Value("${file.static-access-path}")
    private String fileAccessPath;

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        String os = System.getProperty("os.name").toLowerCase();
        String path = os.contains("windows") ? rootPathWindows : rootPathUnix;
        registry.addResourceHandler(fileAccessPath).addResourceLocations("file:" + path);
    }
}

文件下载

文件下载,访问虚拟目录是可以的。如果要实现浏览器强制下载(修改响应头),代码如下

@GetMapping("/forceDownload")
    public MVCResult forceDownload(@RequestParam(value = "fileName", defaultValue = "") String fileName,
                                   @RequestParam(value = "outPutName", required = false) String outPutName,
                                   HttpServletResponse response) throws UnsupportedEncodingException {
        if (StringUtils.isEmpty(fileName)) {
            return MVCResult.fail("forceDownload", "文件名缺失");
        }
        String sys = System.getProperty("os.name").toLowerCase();
        String path = sys.contains("windows") ? rootPathWindows : rootPathUnix;
        String filePath = path + fileName;

        File file = new File(filePath);
        if (!file.exists()) {
            return MVCResult.fail("forceDownload", "文件不存在");
        }
        String orgName = StringUtils.isEmpty(outPutName) ? fileName : outPutName;
        //String newfileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");
        String newFileName = new String(orgName.getBytes(),"ISO8859-1");;
        response.setHeader("Content-Disposition", "attachment;filename=" + newFileName);
        byte[] buff = new byte[1024];
        BufferedInputStream bis = null;
        OutputStream os = null;
        try {
            os = response.getOutputStream();
            bis = new BufferedInputStream(new FileInputStream(file));
            int i = bis.read(buff);
            while (i != -1) {
                os.write(buff, 0, buff.length);
                os.flush();
                i = bis.read(buff);
            }
            int m = i / 0;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bis != null) {
                try {
                    bis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return MVCResult.succ("forceDownload", fileName);
    }

String newFileName = new String(orgName.getBytes(),"ISO8859-1");使下载下来的文件名不是乱码。