Java Unicode Unescape unescapeUnicode(String encoded)

Description

unescape Unicode

License

Apache License

Declaration

private static String unescapeUnicode(String encoded) 

Method Source Code

//package com.java2s;
/*/*from w ww  . j a va  2s .c  o m*/
 * #%L
 * File: StringUtils.java
 * Project: Base Client
 * %%
 * Copyright (C) 2013 - 2016 Cycorp, Inc.
 * %%
 * Licensed 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, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

public class Main {
    private static String unescapeUnicode(String encoded) {
        int length = encoded.length();
        final StringBuilder sb = new StringBuilder(length);
        for (int i = 0; i < length; i++) {
            final char currChar = encoded.charAt(i);
            if ('&' == currChar) {
                final StringBuilder codeBuilder = new StringBuilder(6);
                if ('u' != encoded.charAt(++i)) {
                    throw new IllegalArgumentException("& not followed by u at position " + i + " in " + encoded);
                }
                char nextChar = encoded.charAt(++i);
                while (!(';' == nextChar || i >= length)) {
                    codeBuilder.append(nextChar);
                    nextChar = encoded.charAt(++i);
                }
                sb.append(((char) Integer.parseInt(codeBuilder.toString(), 16)));
            } else {
                sb.append(currChar);
            }
        }
        return sb.toString();
    }
}

Related

1. unescapeHTMLUnicodeEntity(final String text)
2. unescapeUnicode(String s)
3. unescapeUnicode(String s)
4. unescapeUnicodeChars(String string)