上传
/**
* 文件上传
* @param file
* @param file
* @return
*/
@PostMapping("/upload")
@ApiOperation(value = "文件上传")
@ApiOperationSupport(order = 1)
@RequiresPermissions("baseinfo:basic-information:upload")
public RestApiResponse<FileBasicInformation> upload(MultipartFile file) {
ruleCheck(file);
String originalFilename = file.getOriginalFilename();
if (!originalFilename.contains(FILE_SPLIT)) {
throw new SysException("缺少后缀名");
}
String name = originalFilename.substring(0,originalFilename.indexOf(FILE_SPLIT));
String suffix = originalFilename.substring(originalFilename.lastIndexOf(FILE_SPLIT));
String timeStr = formatDate(new Date(), "yyyyMMdd HHmmss");
String folder = File.separator + BASIC_FILE_DIR + File.separator + timeStr.substring(0,8) + File.separator;
String path = folder + name + timeStr.substring(9) + suffix;
try {
FileUtils.saveFile(file, path);
} catch (IOException e) {
throw new SysException("文件保存错误");
}
FileBasicInformation fileBasicInformation = new FileBasicInformation();;
fileBasicInformation.setParent(fileConfig.getSaveDir());
fileBasicInformation.setName(originalFilename);
fileBasicInformation.setUrl(path);
fileBasicInformation.setSize(file.getSize());
fileBasicInformation.setType(file.getContentType());
Long id = fileBasicInformationService.insert(fileBasicInformation);
return RestApiResponse.success(fileBasicInformation);
}
public static void saveFile(MultipartFile file, String path) throws IOException {
Path filePath = Paths.get(fileConfig.getSaveDir(), path);
final Path dir = filePath.getParent();
if (!Files.exists(dir)) {
Files.createDirectories(dir);
}
// 存储方法
file.transferTo(filePath.toFile());
}
TransferTo 方法
在文件上传的时候,MultipartFile中的transferTo(dest)方法只能使用一次;
并且使用transferTo方法之后不可以在使用getInputStream()方法;
否则再使用getInputStream()方法会报异常java.lang.IllegalStateException: File has been moved - cannot be read again;
使用transferTo(dest)方法将上传文件写到服务器上指定的文件;
原因文件流只可以接收读取一次,传输完毕则关闭流;
下载
/**
* @description 文件下载-写汇流到前端
* @param fileName 文件名(带后缀)
* @param url 文件远程地址/文件存储地址完整路径
* @param response
*/
public static void download(String fileName, String url, HttpServletResponse response) throws UnsupportedEncodingException {
response.setContentType("application/force-download");
response.addHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(fileName, "UTF-8"));
InputStream ins = null;
OutputStream os = null;
File file = new File(url);
try {
// 本地文件
if (file.exists()) {
ins = new FileInputStream(file);
} else {
// 网络文件
URL urlFile = null;
urlFile = new URL(url);
// 输入流
ins = urlFile.openStream();
}
os = response.getOutputStream();
int len;
while ((len = ins.read()) != -1) {
os.write(len);
}
} catch (IOException ioe) {
ioe.printStackTrace();
}finally {
try {
os.flush();
ins.close();
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}