Java怎么转义Ӓ这种字符

import org.apache.commons.lang.StringEscapeUtils;  

public class EscapeHtml {  

    /**
     * @param args
     */
    public static void main(String[] args) {
        String aac = StringEscapeUtils.escapeHtml("我的天啊");
        System.out.println(aac);
        String aa = StringEscapeUtils.unescapeHtml(aac);
        System.out.println(aa);
    }
}