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);

    }

}