Java工具類之檔案上傳__Java

  這裡是一個檔案上傳的工具類，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("/");

}

//儲存檔案

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()產生唯一Id的一種演算法;

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("檔案上傳路徑"+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("臨時檔案夾："+path);

File fileTemp = new File(path);

if(!tempFile.exists()){

tempFile.mkdirs;

}

String diskFileStr = path + File.separator + fileName;

logger.info("上傳檔案路徑"+path);

File diskFile = new File(diskFileStr);

if(!diskFile.exists()){

diskFile.createNewFile();

}

return diskFileStr;

}

}