java - JAVA中使用HttpServletRequest上传后文件被锁定

Question

这是一个场景，我尝试上传一个文件，上传后，我尝试从新目录(我刚刚写入的目录)访问该文件，但收到错误消息:

There was an error opening this document. The file is already open or in use by another application.

下面是我的编码。

try{
    conn = this.getConnection();
    String getIP = "SELECT IP FROM TABLE WHERE ID='3'";
    ps = conn.prepareStatement(getIP);
    rs = ps.executeQuery();

    Part file = request.getPart("upload");
    String fileName = extractFileName(request.getPart("upload"));
    String basePath = "//"+ipAdd+"/ns/"+fileName;
    File outputFilePath = new File(basePath + fileName);

    inputStream = file.getInputStream();
    outputStream = new FileOutputStream(outputFilePath);

    int read = 0;
    final byte[] bytes = new byte[1024];
    while ((read = inputStream.read(bytes)) != -1) {
        outputStream.write(bytes, 0, read);
    }
}catch(Exception ex){
    ex.printStackTrace(); 
    throw ex;
}finally{
    if(!conn.isClosed())conn.close();
    if(!ps.isClosed())ps.close();
    if(!rs.isClosed())rs.close();
    inputStream.close();
    outputStream.close();
}

是否是因为我启动上传功能后打开文件太快了？我确实意识到 1/2 分钟后，我就可以访问该文件了。有办法解决这个错误吗？

Answer 1

您没有关闭该文件。添加

outputStream.close();

循环之后。

编辑并在关闭其他任何内容之前先执行此操作。你真的应该在这里使用 try-with-resources 。如果您在关闭任何内容时遇到任何异常，则其他关闭将不会发生。