Java String Encode encode(String s)

Description

Escapes non-ASCII characters in URL.

License

Open Source License

Declaration

public static String encode(String s) 

Method Source Code

//package com.java2s;
/*/*  w w  w  .  j  a v  a  2 s  .  co  m*/
 * The MIT License
 *
 * Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.io.*;

public class Main {
    /**
     * Escapes non-ASCII characters in URL.
     *
     * <p>
     * Note that this methods only escapes non-ASCII but leaves other URL-unsafe characters,
     * such as '#'.
     * {@link #rawEncode(String)} should generally be used instead, though be careful to pass only
     * a single path component to that method (it will encode /, but this method does not).
     */
    public static String encode(String s) {
        try {
            boolean escaped = false;

            StringBuilder out = new StringBuilder(s.length());

            ByteArrayOutputStream buf = new ByteArrayOutputStream();
            OutputStreamWriter w = new OutputStreamWriter(buf, "UTF-8");

            for (int i = 0; i < s.length(); i++) {
                int c = s.charAt(i);
                if (c < 128 && c != ' ') {
                    out.append((char) c);
                } else {
                    // 1 char -> UTF8
                    w.write(c);
                    w.flush();
                    for (byte b : buf.toByteArray()) {
                        out.append('%');
                        out.append(toDigit((b >> 4) & 0xF));
                        out.append(toDigit(b & 0xF));
                    }
                    buf.reset();
                    escaped = true;
                }
            }

            return escaped ? out.toString() : s;
        } catch (IOException e) {
            throw new Error(e); // impossible
        }
    }

    private static char toDigit(int n) {
        return (char) (n < 10 ? '0' + n : 'A' + n - 10);
    }
}

Related

1. encode(String encoding, String string)
2. encode(String encoding, String text)
3. encode(String name)
4. encode(String s)
5. encode(String s)
6. encode(String s, String enc)
7. encode(String s, String encoding)
8. encode(String source, String charsetFrom, String charsetTo)
9. encode(String src)