package org.edujks.schoolapp.schoolbasedresearch.schoolsubject.action;

public class DecodeUtil {

    /**

     * @declare native与ascii码互转

     * @param args

     * @author Lilin

     */

    public static void main(String[] args) {

        // TODO Auto-generated method stub

        String a = chinaToUnicode("飞机f发多少adsfadsfadfad");

        System.out.println(a);

        System.out.println(decodeUnicode(a));

    }

    /**

     * 把中文转成Unicode码

     *

     * @param str

     * @return

     */

    public static String chinaToUnicode(String str) {

        String result = "";

        for (int i = 0; i < str.length(); i++) {

            int chr1 = (char) str.charAt(i);

            if (chr1 >= 19968 && chr1 <= 171941) {// 汉字范围 \u4e00-\u9fa5 (中文)

                result += "\\u" + Integer.toHexString(chr1);

            } else {

                result += str.charAt(i);

            }

        }

        return result;

    }

    /**

     * 判断是否为中文字符

     *

     * @param c

     * @return

     */

    public static boolean isChinese(char c) {

        Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);

        if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS

                || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS

                || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A

                || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION

                || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION

                || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {

            return true;

        }

        return false;

    }

    /***

     * 转码

     *

     * @param theString

     * @return

     *

     * @time 2012-6-13 下午5:54:34 TODO

     */

    public static String decodeUnicode(String theString) {

        char aChar;

        int len = theString.length();

        StringBuffer outBuffer = new StringBuffer(len);

        for (int x = 0; x < len;) {

            aChar = theString.charAt(x++);

            if (aChar == '\\') {

                aChar = theString.charAt(x++);

                if (aChar == 'u') {

                    int value = 0;

                    for (int i = 0; i < 4; i++) {

                        aChar = theString.charAt(x++);

                        switch (aChar) {

                        case '0':

                        case '1':

                        case '2':

                        case '3':

                        case '4':

                        case '5':

                        case '6':

                        case '7':

                        case '8':

                        case '9':

                            value = (value << 4) + aChar - '0';

                            break;

                        case 'a':

                        case 'b':

                        case 'c':

                        case 'd':

                        case 'e':

                        case 'f':

                            value = (value << 4) + 10 + aChar - 'a';

                            break;

                        case 'A':

                        case 'B':

                        case 'C':

                        case 'D':

                        case 'E':

                        case 'F':

                            value = (value << 4) + 10 + aChar - 'A';

                            break;

                        default:

                            throw new IllegalArgumentException(

                                    "Malformed   \\uxxxx   encoding.");

                        }

                    }

                    outBuffer.append((char) value);

                } else {

                    if (aChar == 't')

                        aChar = '\t';

                    else if (aChar == 'r')

                        aChar = '\r';

                    else if (aChar == 'n')

                        aChar = '\n';

                    else if (aChar == 'f')

                        aChar = '\f';

                    outBuffer.append(aChar);

                }

            } else

                outBuffer.append(aChar);

        }

        return outBuffer.toString();

    }

}