Java String Decode decode(String s)

Description

Copied from URLDecoder.java

License

Open Source License

Declaration

public static String decode(String s) 

Method Source Code

//package com.java2s;
/*//from ww w .  j a v a 2  s.  c o m
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.io.UnsupportedEncodingException;

public class Main {
    /**
     * Copied from URLDecoder.java
     */
    public static String decode(String s) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            switch (c) {
            case '+':
                sb.append(' ');
                break;
            case '%':
                try {
                    sb.append((char) Integer.parseInt(s.substring(i + 1, i + 3), 16));
                } catch (NumberFormatException e) {
                    throw new IllegalArgumentException(s);
                }
                i += 2;
                break;
            default:
                sb.append(c);
                break;
            }
        }
        // Undo conversion to external encoding
        String result = sb.toString();
        try {
            byte[] inputBytes = result.getBytes("8859_1");
            result = new String(inputBytes);
        } catch (UnsupportedEncodingException e) {
            // The system should always have 8859_1
        }
        return result;
    }
}

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