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();
    }