getPath()与getAbsolutePath()的区别

public static void main(String[] args) {
        File file = new File("\\data\\draw_lottery\\test1.txt");
        //取得相对路径
        System.out.println("Path: " + file.getPath());
        //取得绝对路径 window对应盘符的根路径
        System.out.println("getAbsolutePath: " + file.getAbsolutePath());
}

结果：

Path: \data\draw_lottery\test1.txt
getAbsolutePath: D:\data\draw_lottery\test1.txt

图片上传到指定路径

String absPath = getAbsoluteFile(baseDir, fileName).getAbsolutePath();
file.transferTo(Paths.get(absPath));

public static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException
{
  File desc = new File(uploadDir + File.separator + fileName);
  if (!desc.exists()){
     if (!desc.getParentFile().exists()){
         desc.getParentFile().mkdirs();
      }
  }
  return desc;
}

关于transferTo，在本地没有指定盘符的情况下会报错

void transferTo(File dest) throws IOException, IllegalStateException;

default void transferTo(Path dest) throws IOException, IllegalStateException {
        FileCopyUtils.copy(this.getInputStream(), Files.newOutputStream(dest));
}