Java工具類之文件上傳

  這裏是一個文件上傳的工具類，通用性很強。廢話不多說，直奔主題。如有疑問或錯誤，歡迎指正交流。

 

public class FileUploadUtils {

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

	public static String getUploadPath(HttpServletRequest request){

		return getApplicationPath(request)+Constens.UPLOAD_FOLDER;//Contens.UPLOAD_FOLDER是一個常量upload

	}

	public static String getApplictionPath(HttpServletRequest request){

		return request.getSession().getServletContext().getRealPath("/");

	}

	//保存文件

	public static String saveUploadFileToDisk(MultipartFile multipartFile,HttpServletRequest request,String tempDir )throws Exception{

	InputStream is = null;

	OutputStream os = null;

	String filePath = null;

	String fileName = null;

	String suffix = null;

	String tempName = null;

	try{

		is = multipartFile.getInputStream();

		fileName = multipartFile.getOriginalFilename();

		suffix = fileName.substring(fileName.indexOf("."));

		tempName = IdUtils.uuid32()+suffix;//Idutils.uuid32()生成唯一Id的一種算法;

		filePath = createFile(request,tempName,tempDir);

		os = new FileOutputStream(filePath);

		byte[] b = new byte(1024);

		while(is.read(b,0,b.length)>-1){

			os.write(b);

			}

		}catch（IOException e）{

			e.printStackTrace();

		}finally{

			if(os != null){

			os.flush();

			os.close();

			}

			if(is != null){

			is.close();

			}

		}

		logger.info("文件上傳路徑"+filePath);

		//return  tempDir + File.separator + tempName;//相對路徑

		return filePath.replace(getFilePath(),"");

	}

	public static String createFile（HttpServletRequest request,String fileName,String tempDir)throws Exception{

	tempDir = StringUtils.isNotBlank(tempDir)?tempDir:UUID.randomUUID().toString();

	Date nowTime = new Date(System.currentTimeMillis());

	SimpleDateFormat sdFormatter = new SimpleDateFormat("yyyy-MM-dd");

	String retStrFormatNowDate = sdFormatter.format(nowTime);

	String[] timeTemp = retstrFormatNowDate.split("-");

	String path = "";

	path = getFilePath()+File.separator+timeTemp[0]+File.separator+timeTemp[1]+File.separator+timeTemp[2]+File.separator+tempDir;

	logger.info("臨時文件夾："+path);

	File fileTemp = new File(path);

	if(!tempFile.exists()){

		tempFile.mkdirs;

		}

	String diskFileStr = path + File.separator + fileName;

	logger.info("上傳文件路徑"+path);

	File diskFile = new File(diskFileStr);

	if(!diskFile.exists()){

	diskFile.createNewFile();

		}

	return diskFileStr;

	}

}