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get encoded url request value

1 decade ago Mar 15, 2012 1:28pm
Basil Bourque
1 decade ago Mar 23, 2012 7:37pm

(a) 'C4' is not the character you are looking for.

'C4' hex for decimal 196, which in Unicode is the character:
Looks like: Ä

Apparently you want C5 (197):
Looks like: Å

Tip: If you use Mac OS X, I highly recommend downloading the free app UnicodeChecker to see a complete database of Unicode characters.

(b) I am not having any problem retrieving URL parameters containing U+00C4 & U+00C5 Uniccode characters.

I am using plain Java 6 and the Vaadin 6 ParameterHandler class running in Eclipse Indigo using it's built-in web browser (WebKit based, as I understand it).

Here is a simple example app that dumps the URL parameter to the console. Simply copy-paste this code as a complete Vaadin 6.7.6 app.

This URL:
Outputs this to the console:
DEBUG - Dumping map of 3 URL paramaters to console. Fri Mar 23 12:21:33 PDT 2012
param1 yelds 1 values ---> [value1]
param2 yelds 1 values ---> [vÄlue2]
param3 yelds 1 values ---> [vÅlue3]

package com.example.examplevaadin;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;

import com.vaadin.Application;
import com.vaadin.data.util.ObjectProperty;
import com.vaadin.data.util.PropertyFormatter;
import com.vaadin.terminal.ParameterHandler;
import com.vaadin.ui.*;

 * This complete Vaadin 6.7.6 app demonstrates how to access any URL parameters.
 * Most Vaadin apps do not use any URL parameters. But you may want to for special cases.
 * See section 12.5.2 "Parameter Handlers" in the Book of Vaadin for more info.
 * https://vaadin.com/book/-/page/advanced.resources.html
 * © 2012 Basil Bourque. This source code may be used freely forever by anyone taking full responsibility for doing so.
 * @author Basil Bourque. 
public class ExamplevaadinApplication extends Application {

    @SuppressWarnings ( { "serial", "unchecked" })
    public void init() {
        Window window = new Window( "Examplevaadin Application" );
        Label label = new Label( "Look at console or logs to see list of parameters passed on URL." );
        window.addComponent( label );
        Label label2 = new Label( "Try a URL like: " + "http://localhost:8080/ExampleVaadin/?param1=value1&param2=value2&param3=value3" );
        window.addComponent( label2 );
        Label label3 = new Label( "Or try some Unicode in your URL: " + "http://localhost:8080/ExampleVaadin/?param1=value1&param2=v%C4lue2&param3=v%C5lue3" );
        window.addComponent( label3 );

        UrlParameterDumper dumper = new UrlParameterDumper();
        window.addParameterHandler( dumper );

        setMainWindow( window );


 * Demonstrates dumping URI parameters to the console.
 class UrlParameterDumper implements ParameterHandler {

     * Implement the method required by the ParameterHandler interface.
    public void handleParameters( Map< String, String[] > parameters ) {
        // Dump map of parameters to console.
        System.out.println( "DEBUG - Dumping map of " + parameters.size() + " URL paramaters to console. "
                + new java.util.Date() );
        Iterator< String > iterator = parameters.keySet().iterator();
        while ( iterator.hasNext() ) {
            String key = iterator.next().toString();
            String[] valuesArray = parameters.get( key );
            ArrayList< String > valuesList = new ArrayList< String >( Arrays.asList( valuesArray ) ); // For easy printing, convert array to a Collection.
            System.out.println( key + " yelds " + valuesList.size() + " values ---> " + valuesList );



Last updated on Mar, 23rd 2012