import javax.crypto.KeyGenerator; 
import javax.crypto.Mac; 
import javax.crypto.SecretKey; 
import javax.xml.bind.annotation.adapters.HexBinaryAdapter; 
 
public class Main { 
 
  static String src = "Hello,sahadev!"; 
 
  public static void main(String[] args) { 
    HmacMD5(); 
  } 
 
  public static void HmacMD5() { 
    try { 
      // 获取密钥生成器 
      KeyGenerator keyGenerator = KeyGenerator.getInstance("HmacMD5"); 
      // 生成密钥 
      SecretKey generateKey = keyGenerator.generateKey(); 
 
      // 获取"Message Authentication Code" (MAC) algorithm实例 
      Mac instance = Mac.getInstance(generateKey.getAlgorithm()); 
      // 根据生产的密钥初始化该实例 
      instance.init(generateKey); 
 
      // 加密消息 
      byte[] doFinal = instance.doFinal(src.getBytes()); 
      // 输出加密后的消息 
      System.out.println("HmacMD5 : " 
          + new HexBinaryAdapter().marshal(doFinal)); 
 
    } catch (Exception e) { 
      e.printStackTrace(); 
    } 
  } 
 
}