File outFile = new File("路径");
File file = FileUtil.writeFromStream(inputStream, outFile);
inputStream = new FileInputStream(file);
FileUtil.del(file);
outFile = new File("新路径");
FileUtil.writeFromStream(inputStream, outFile);
第一次写入文件还是正常的,删了重写之后,文件长度就变成了0;
工具室hutool加的工具类