URI 方案不是“文件”。

发布于 2024-09-01 16:36:13 字数 880 浏览 4 评论 0原文

我得到例外:“URI 方案不是文件”

我正在做的是尝试获取文件的名称,然后从 servlet 内将该文件(从另一台服务器)保存到我的计算机/服务器上。

我有一个名为“url”的字符串,这里是我的代码:

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));
} 

导致错误的行是这一行:

File 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尝试执行的操作。

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.

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以歌曲疗慰 2024-09-08 16:36:13

URI“scheme”是“:”之前的内容,例如“http://stackoverflow.com”中的“http”。

错误消息告诉您 new File(fileUri) 仅适用于“file:”URI(引用当前系统上的路径名),而不适用于“http”等其他方案。

基本上,“file:”URI 是指定 File 类路径名的另一种方式。这并不是告诉 File 使用 http 从网络获取文件的神奇方法。

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.

2024-09-08 16:36:13

您从 URL 创建 File 的假设在这里是错误的。

您只是不需要从 Internet 上的文件的 URL 创建一个 File 来获取文件名。

您可以简单地通过解析 URL 来完成此操作,如下所示:

URL fileUri = new URL("http://local.wasp.uwa.edu.au/~pbourke/miscellaneous/domefisheye/ladybug/fish4.jpg");    
int startIndex = fileUri.toString().lastIndexOf('/');
String fileName = fileUri.toString().substring(startIndex + 1);
System.out.println(fileName);

Your assumption to create File from URL is wrong here.

You just don't need to create a File from URL to the file in the Internet, so that you get the file name.

You can simply do this with parsing the URL like that:

URL fileUri = new URL("http://local.wasp.uwa.edu.au/~pbourke/miscellaneous/domefisheye/ladybug/fish4.jpg");    
int startIndex = fileUri.toString().lastIndexOf('/');
String fileName = fileUri.toString().substring(startIndex + 1);
System.out.println(fileName);
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