public class ASCIIUtil {

    public static void main(String[] args) {
        System.out.println(stringToAscii("hello嗨嘍"));
        System.out.println(asciiToString("104,101,108,108,111,21992,21949"));
    }

    public static String stringToAscii(String value) {
        StringBuffer stringBuffer = new
 
 StringBuffer();
        char[] chars = value.toCharArray();
        for (char c : chars) {
            stringBuffer.append((int) c).append(",");
        }
        return stringBuffer.toString().substring(0, stringBuffer.length() - 1);
    }

    public static String asciiToString(String value)  
    {  
        StringBuffer stringBuffer = new
 
 StringBuffer();  
        String[] chars = value.split(",");  
        for(String c : chars){
            stringBuffer.append((char) Integer.parseInt(c));  
        }
        return stringBuffer.toString();  
    }  

}