特别要检查Java文件操作相关方法的返回值

...
File tmpFile = new File(fileTmpPath);
File newFileTarget = new File(filePath);
tmpFile.renameTo(newFileTarget);
// 修改新文件的权限
FileManageHelper.chmod(newFileTarget);
....

/**
     * Renames the file denoted by this abstract pathname.
     *
     * <p> Many aspects of the behavior of this method are inherently
     * platform-dependent: The rename operation might not be able to move a
     * file from one filesystem to another, it might not be atomic, and it
     * might not succeed if a file with the destination abstract pathname
     * already exists.  The return value should always be checked to make sure
     * that the rename operation was successful.
     *
     * <p> Note that the {@link java.nio.file.Files} class defines the {@link
     * java.nio.file.Files#move move} method to move or rename a file in a
     * platform independent manner.
     *
     * @param  dest  The new abstract pathname for the named file
     *
     * @return  <code>true</code> if and only if the renaming succeeded;
     *          <code>false</code> otherwise
     *
     * @throws  SecurityException
     *          If a security manager exists and its <code>{@link
     *          java.lang.SecurityManager#checkWrite(java.lang.String)}</code>
     *          method denies write access to either the old or new pathnames
     *
     * @throws  NullPointerException
     *          If parameter <code>dest</code> is <code>null</code>
     */
The rename operation might not be able to move a file from one filesystem to another