HMACSHA 1暗号化

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

public class HMACSHA1 {
	public static String getHMACSHA1(String base, String key) {
		String result = "";
		String type = "HmacSHA1";
		SecretKeySpec secret = new SecretKeySpec(key.getBytes(), type);
		try {
			Mac mac = Mac.getInstance(type);
			mac.init(secret);
			byte[] digest = mac.doFinal(base.getBytes());
			StringBuilder sb=new StringBuilder();  
			for(byte b:digest){  
				sb.append(byteToString(b));  
			}
			result = sb.toString();
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return result;
	}
	
	private static String byteToString(byte ib){  
		char[] Digit={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};  
		char[] ob=new char[2];  
		ob[0]=Digit[(ib>>>4)& 0X0f];  
		ob[1]=Digit[ib & 0X0F];  
		String s=new String(ob);  
		return s;           
	}  
	
}