url进行utf-8编码

public static String utf8encode(String text) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < text.length(); i++) {
            char c = text.charAt(i);
            if(c >= 0 && c<= 255) {
                sb.append(c);
            } else {
                byte[] b = new byte[0];
                try {
                    b = Character.toString(c).getBytes("UTF-8");
                }catch (Exception e) {
                }
                for (int j = 0; j < b.length; j++) {
                    int k = b[j];
                    if(k <0 ) k += 256;
                    sb.append("%" + Integer.toHexString(k).toUpperCase());
                }
            }
        }
        return sb.toString();
    }