package aa.com;

import java.io.UnsupportedEncodingException;

public class UnicodeUtil {

    public static void main(String[] args) throws UnsupportedEncodingException {

        String s = "简介";

        System.err.println(s+" --的unicode编码是："+encoding(s));

        System.err.println(encoding(s) + " --转换成中文是："+decodeUnicode(encoding(s)));

        System.err.println("\\u9EC4%u5927" + " --转换成中文是："+decodeUnicode("\\u9EC4\\u5927"));

    }

    /*

     * 中文转unicode编码

     */

    public static String encoding(String gbString) {

        char[] utfBytes = gbString.toCharArray();

        String unicodeBytes = "";

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

            String hexB = Integer.toHexString(utfBytes[i]);

            if (hexB.length() <= 2) {

                hexB = "00" + hexB;

            }

            unicodeBytes = unicodeBytes + "\\u" + hexB;

        }

        return unicodeBytes;

    }

    /*

     * unicode编码转中文

     * 系统中接受中文参数变成百分号，如：“黄大”-->“%u9EC4%u5927”

     * 而实际上内容对应，应该是：“黄大”-->“\u9EC4\u5927”，中文变unicode

     */

    public static String decodeUnicode(String dataStr) {

        dataStr = dataStr.replace("%","\\");//这行酌情不要

        int start = 0;

        int end = 0;

        final StringBuffer buffer = new StringBuffer();

        while (start > -1) {

            end = dataStr.indexOf("\\u", start + 2);

            String charStr = "";

            if (end == -1) {

                charStr = dataStr.substring(start + 2, dataStr.length());

            } else {

                charStr = dataStr.substring(start + 2, end);

            }

            char letter = (char) Integer.parseInt(charStr, 16); // 16进制parse整形字符串。

            buffer.append(new Character(letter).toString());

            start = end;

        }

        return buffer.toString();

    }

}