Java String Decode by Charset decode(String s, Charset encoding)

Description

Decodes an octet according to RFC 2396.

License

Apache License

Parameter

Parameter	Description
s	the URI to decode
encoding	the encoding to decode into

Return

The decoded URI

Declaration

public static String decode(String s, Charset encoding) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.nio.charset.Charset;

public class Main {
    public static final Charset LATIN1 = Charset.forName("ISO-8859-1");

    /**/*  ww  w  .java 2s  .co  m*/
     * Decodes an octet according to RFC 2396. According to this spec,
     * any characters outside the range 0x20 - 0x7E must be escaped because
     * they are not printable characters, except for any characters in the
     * fragment identifier. This method will translate any escaped characters
     * back to the original.
     *
     * @param s      the URI to decode
     * @param encoding the encoding to decode into
     * @return The decoded URI
     */
    public static String decode(String s, Charset encoding) {
        if (s == null || s.isEmpty()) {
            return null;
        }
        StringBuilder sb = new StringBuilder();
        boolean fragment = false;
        for (int i = 0; i < s.length(); i++) {
            char ch = s.charAt(i);
            switch (ch) {
            case '+':
                sb.append(' ');
                break;
            case '#':
                sb.append(ch);
                fragment = true;
                break;
            case '%':
                if (!fragment) {
                    // fast hex decode
                    sb.append((char) ((Character.digit(s.charAt(++i), 16) << 4)
                            | Character.digit(s.charAt(++i), 16)));
                } else {
                    sb.append(ch);
                }
                break;
            default:
                sb.append(ch);
                break;
            }
        }
        return new String(sb.toString().getBytes(LATIN1), encoding);
    }
}

Related

1. decode(final String str, final Charset charset)
2. decode(String url, Charset charset)
3. decode(String value, Charset charset)
4. decode(String value, Charset charset)
5. decodeCharset(String value, String charset)