工具类代码如下：

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();    }}