Interacting with Networks and Databases - Beginning Java 7 - page 834

Normalization
Normalization istheprocessofremovingunnecessary“.”and“..”pathsegmentsfroma
hierarchicalURI'spathcomponent.Each“.”segmentisremoved.A“..”segmentisre-
movedonlywhenit'sprecededbyanon-“..”segment.Normalizationhasnoeffectupon
opaque URIs.
URI declares a URI normalize() method for normalizing a URI. This method
returns a new URI object that contains the normalized equivalent of its caller's URI.
Listing 9-11 presents an application that lets you experiment with normalize() .

Listing 9-11. Normalizing URIs

import java.net.URI;
import java.net.URISyntaxException;

class Normalize
{

public static void main(String[] args) throws URISyn-
taxException
{

if (args.length != 1)
{

System.err.println("usage: java normalize uri");
return;

}
URI uri = new URI(args[0]);
System.out.println("normalized uri =

"+uri.normalize());
}

}

Compile Listing9-11 ( javac Normalize.java )andruntheapplicationasfol-
lows: java Normalize a/b/../c/./d .Youshouldobservethefollowingout-
put, which shows that b isn't part of a normalized URI:
Normalized URI = a/c/d