URI方案不是“文件” [英] URI scheme is not "file"

问题描述

我得到例外：URI方案不是文件

我正在做的是尝试获取一个文件的名称，然后保存该文件（从我有一个名为url的字符串，这里是我的代码：

  url = Streams.asString（stream）; //从网页上的表单获取URL 
 System.out.println（这是URL：+ url）; 
 URI fileUri = new URI（url）; 
 
文件fileFromUri = new File（fileUri）; 
 
 onlyFile = fileFromUri.getName（）; 
 URL fileUrl = new URL（url）; 
 InputStream imageStream = fileUrl.openStream（）; 
 String fileLoc2 = getServletContext（）。getRealPath（pics /+ onlyFile）; 
 
文件newFolder = new File（getServletContext（）。getRealPath（pics））; 
 if（！newFolder.exists（））{
 newFolder.mkdir（）; 
} 
 IOUtils.copy（imageStream，new FileOutputStream（pics /+ onlyFile））; 
} 
  

导致错误的行是这样一个：

 文件FileFromUri = new File（fileUri）; 
  

我已经添加了其余的代码，以便您可以看到我正在做的事情。 p>

解决方案

URIscheme是:)之前的东西，例如 http://stackoverflow.com 。

错误信息告诉你， new File（fileUri）只对file：URI有效（它指的是当前系统上的路径名），而不是像http这样的其他方案。

基本上，file：URI是另一种指定 File 类的路径名的方式。告诉文件以使用http从网络获取文件不是一种奇妙的方式。

I get the exception: "URI scheme is not file"

What I am doing is trying to get the name of a file and then save that file (from another server) onto my computer/server from within a servlet.

I have a String called "url", from thereon here is my code:

url = Streams.asString(stream); //gets the URL from a form on a webpage
System.out.println("This is the URL: "+url);
URI fileUri = new URI(url);

File fileFromUri = new File(fileUri);                   

onlyFile = fileFromUri.getName(); 
URL fileUrl = new URL(url);
InputStream imageStream = fileUrl.openStream();
String fileLoc2 = getServletContext().getRealPath("pics/"+onlyFile);

File newFolder = new File(getServletContext().getRealPath("pics"));
    if(!newFolder.exists()){
        newFolder.mkdir();
    }
    IOUtils.copy(imageStream, new FileOutputStream("pics/"+onlyFile));
} 

The line causing the error is this one:

File fileFromUri = new File(fileUri);                   

I have added the rest of the code so you can see what I am trying to do.

解决方案

The URI "scheme" is the thing that comes before the ":", for example "http" in "http://stackoverflow.com".

The error message is telling you that new File(fileUri) works only on "file:" URI's (ones referring to a pathname on the current system), not other schemes like "http".

Basically, the "file:" URI is another way of specifying a pathname to the File class. It is not a magic way of telling File to use http to fetch a file from the web.

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