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);  
    }  
}