java.io.File中的renameTo方法尽量少用，因为可能会出现文件系统不一致问题导致文件移动失败。具体可能出现的问题包括：1、NTFS、FAT32 分区格式问题。2、文件分隔符问题\\和/。3、rename的文件存在。

public boolean renameTo(File dest) {
        SecurityManager security = System.getSecurityManager();
        if (security != null) {
            security.checkWrite(path);
            security.checkWrite(dest.path);
        }
        if (dest == null) {
            throw new NullPointerException();
        }
        if (this.isInvalid() || dest.isInvalid()) {
            return false;
        }
        return fs.rename(this, dest);
    }

具体的实现在你当前对应的文件系统，最终调用了本地的rename0方法：

public boolean rename(File f1, File f2) {
        // Keep canonicalization caches in sync after file deletion
        // and renaming operations. Could be more clever than this
        // (i.e., only remove/update affected entries) but probably
        // not worth it since these entries expire after 30 seconds
        // anyway.
        cache.clear();
        javaHomePrefixCache.clear();
        return rename0(f1, f2);
    }
    private native boolean rename0(File f1, File f2);

推荐使用的方法：

if(!destFile.exists()){
      FileUtils.copyFile(file, destFile);
      file.delete();
}

参考：http://xiaoych.iteye.com/blog/149328