将汉字转化成Unicode编码

public static String toUNICODE(String s)     {         StringBuilder sb=new StringBuilder();         for(int i=0;i<s.length();i++)         {             if(s.charAt(i)<=256)             {                 sb.append("\\u00");             }             else             {                 sb.append("\\u");             }             sb.append(Integer.toHexString(s.charAt(i)));         }         return sb.toString();     }