> For the complete documentation index, see [llms.txt](https://yangsx95.gitbook.io/notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yangsx95.gitbook.io/notes/computer-science/ji-suan-ji-wang-luo/http/file-xie-yi.md).

# file协议

今天在写spring包扫描实现的时候，要扫描包下的所有class文件。然后我要根据classpath创建一个绝对路径的File对象，所以想到了File的`new File(new URI("file:///path"))`构造。中间遇到了一些坑，特意去了解了一下 `file:///`这个协议。

file协议中文名称为**本地文件协议，通常用于**访问计算机中的本地文件\*\*。我们可以通过向浏览器或者文件管理器输入协议，来查看磁盘中的文件：

![pasted-0](/files/HxMwSZ9XInpIY0UVk8CF)

因为file协议本身是一种协议，所以，它也遵循uri规则：

```
scheme:[//[user:password@]host[:port]][/]path[?query][#fragment]
```

因为host部分不存在，所以，file协议的uri可以写为：

```
file:/path  #准确，此标准称作CURIE， 如果‘/’去除，代表相对路径
或者 
file:///path
```


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