Decoding and encoding URLs

    
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 * distributed with this work for additional information
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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
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 * KIND, either express or implied. See the License for the
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 */


import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.logging.Logger;


/**
 * Utility class for decoding and encoding URLs
 *
 */
public final class UrlUtils {
    

    private static final String[] RESERVED_CHARS = {"+"};
    private static final String[] ENCODED_CHARS = {"%2b"};
    
    private UrlUtils() {
        
    }

    /**
     * Decodes using URLDecoder - use when queries or form post values are decoded
     * @param value value to decode
     * @return
     */
    public static String urlDecode(String value) {
        try {
            value = URLDecoder.decode(value, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            System.out.println("UTF-8 encoding can not be used to decode " + value);          
        }
        return value;
    }
    
    /**
     * URL path segments may contain '+' symbols which should not be decoded into ' '
     * This method replaces '+' with %2B and delegates to URLDecoder
     * @param value value to decode
     * @return
     */
    public static String pathDecode(String value) {
        // TODO: we actually need to do a proper URI analysis here according to
        // http://tools.ietf.org/html/rfc3986
        for (int i = 0; i < RESERVED_CHARS.length; i++) {
            if (value.indexOf(RESERVED_CHARS[i]) != -1) {
                value = value.replace(RESERVED_CHARS[i], ENCODED_CHARS[i]);
            }
        }
        
        return urlDecode(value);
    }
    
}

Related examples in the same category

1.	URL Encoder: similar to the java.net.URLEncoder class
2.	Parse a x-www-form-urlencoded string
3.	URL Encoder: Encode a string according to RFC 1738.
4.	Encode a path as required by the URL specification
5.	Calls java.net.URLEncoder.encode(String, String) via reflection, if we are running on JRE 1.4 or later, otherwise reverts to the deprecated URLEncoder.encode(String)method.
6.	Implements the 'www-form-urlencoded' encoding scheme, also misleadingly known as URL encoding.
7.	Provides a method to encode any string into a URL-safe form
8.	Converts a String SJIS or JIS URL encoded hex encoding to a Unicode String
9.	Request parsing and encoding utility methods

Decoding and encoding URLs : URLEncoder « Network Protocol « Java

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