本文实例讲述了Java SHA-256加密的两种实现方法。分享给大家供大家参考,具体如下:

参考文献 Java实现SHA256算法 - 自学java的小陈 - 博客园 (cnblogs.com)

1、利用Apache的工具类实现加密:

maven:

<dependency>
 <groupId>commons-codec</groupId>
 <artifactId>commons-codec</artifactId>
 <version>${common-codec.version}</version>
</dependency> 

实现代码:

* 利用Apache的工具类实现SHA-256加密 * @param str 加密后的报文 * @return public static String getSHA256Str(String str){ MessageDigest messageDigest; String encdeStr = ""; try { messageDigest = MessageDigest.getInstance("SHA-256"); byte[] hash = messageDigest.digest(str.getBytes("UTF-8")); encdeStr = Hex.encodeHexString(hash); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); return encdeStr;

2、利用Java自带的实现加密:

* 利用java原生的摘要实现SHA256加密 * @param str 加密后的报文 * @return
* import java.io.UnsupportedEncodingException;
* import java.security.MessageDigest;
* import java.security.NoSuchAlgorithmException;
messageDigest = MessageDigest.getInstance("SHA-256"); messageDigest.update(str.getBytes("UTF-8")); encodeStr = byte2Hex(messageDigest.digest()); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); return encodeStr; * 将byte转为16进制 * @param bytes * @return private static String byte2Hex(byte[] byteBuffer){ StringBuffer strHexString = new StringBuffer();

for (int i = 0; i < byteBuffer.length; i++) {
String hex = Integer.toHexString(0xff & byteBuffer[i]);
if (hex.length() == 1) {
strHexString.append('0');
}
strHexString.append(hex);
}

 return stringBuffer.toString();