java MD5 32位加密

import java.security.MessageDigest;  
import java.security.NoSuchAlgorithmException;  
  
public class MD5 {  
  
    public static void main(String[] args) { 
        MD5 md5 = new MD5();
        String ss = md5.encryption("10012843443");  
        System.err.print(ss);
    }  
  
    public String encryption(String OrderNo) {
        String result = OrderNo+"354039456123789"+"andriod"; 
        String re_md5 = new String();
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(result.getBytes());
            byte b[] = md.digest();
 
            int i;
 
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
 
            re_md5 = buf.toString();
 
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return re_md5.toUpperCase();
    }
}

MD5加密后生成32位长度字符串并转换成大写