![](/img/trans.png)
[英]Commons VFS and Java.net.URL - Adding support for “sftp://” protocol
[英]Commons VFS and Java.net.URL - Adding support for “ram://” protocol
我正在使用commons-vfs ,为了进行测试,我想使用ram文件系统。 当我尝试使用new URL("ram:///A/B/sample.jar")
,出现以下异常:
java.net.MalformedURLException: unknown protocol: ram
at java.net.URL.<init>(URL.java:592)
at java.net.URL.<init>(URL.java:482)
at java.net.URL.<init>(URL.java:431)
这是一些代码(当我使用文件协议时,一切正常
// URL is used to construct an object
obj.addArchive(new URL("ram:///A/B/sample.jar"))
...
// then VFS is used to scan the object urls
// for instance get the parent directory
FileSystemManager manager = VFS.getManager();
String directory = manager.resolveFile(obj.getPath()).getParent().getURL().toExternalForm();
我如何在java.net.URL
使用ram
协议?
我发现基于使用的定制解决方案URL
处理器所描述这里 。
向url-scheme-registry添加一个maven依赖项 :
<dependency>
<groupId>org.skife.url</groupId>
<artifactId>url-scheme-registry</artifactId>
<version>0.0.1</version>
</dependency>
为ram模式创建一个自定义URLStreamHandler
:
public class RamHandler extends URLStreamHandler {
@Override
protected URLConnection openConnection(final URL u) throws IOException {
//May instead use VFS DefaultURLConnection
return new URLConnection(u) {
@Override
public void connect() throws IOException {}
@Override
public InputStream getInputStream() throws IOException {
FileSystemManager fsManager = VFS.getManager();
FileObject entry = fsManager.resolveFile(u.toExternalForm());
FileContent content = entry.getContent();
return content.getInputStream();
}
};
}
}
这样就不会有格式错误的url异常:
UrlSchemeRegistry.register("ram", RamHandler.class);
URL url = new URL("ram:///A/B/sample.jar");
VFS支持创建一个流处理程序工厂,该工厂知道所有已注册的方案。
// you might want to configure a manager with less schemes
FileSystemManager fsm = VFS.getManager();
URLStreamHandlerFactory factory = fsm.getURLStreamHandlerFactory();
URL.setURLStreamHandlerFactory(factory); // VM global
URL url = new URL("ram://test.txt");
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.