Resource

1. Resource API

public interface InputStreamSource {  
    InputStream getInputStream() throws IOException;  
}

public interface Resource extends InputStreamSource {  
       boolean exists();  
       boolean isReadable();  
       boolean isOpen();  
       URL getURL() throws IOException;  
       URI getURI() throws IOException;  
       File getFile() throws IOException;  
       long contentLength() throws IOException;  
       long lastModified() throws IOException;  
       Resource createRelative(String relativePath) throws IOException;  
       String getFilename();  
       String getDescription();  
}

  • InputStreamSource:

  • getInputStream: Return new java.io.InputStream which needs close after used.

  • Resource extends InputStreamSource:

  • exists: Resource exists?

  • isReadable: Resource readable?

  • isOpen: Resource open?

  • getURL: java.util.URL.

  • getURI: java.util.URI.

URIs identify and URLs locate; however, locators are also identifiers, so every URL is also a URI, but there are URIs which are not URLs.

  • getFile: java.io.File.
  • contentLength: Resource length.
  • lastModified_: Modified date.
  • createRelateive: create file in Resource.
  • getFilename: ONLY return file path.
  • getDescription return full file path.