JDK自带加密算法sha-1

转载自：http://blog.sina.com.cn/s/blog_667ac0360102ed0w.html

  APP端开发为了省空间，不打算导入apache-commons的jar包，可以使用JDK自带的加密算法；

package com.common.util;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

//import org.apache.commons.codec.digest.DigestUtils;

///

 // JDK自带加密算法

 // 

 // @author iPan

 // @version 2014-4-25

 //

public class MessageDigestUtils {

public static String sha1(String text) {

MessageDigest md = null;

String outStr = null;

try {

md = MessageDigest.getInstance("SHA-1");

byte[] digest = md.digest(text.getBytes());

outStr = byteToString(digest);

} catch (NoSuchAlgorithmException e) {

throw new RuntimeException(e);

}

return outStr;

}

private static String byteToString(byte[] digest) {

StringBuilder buf = new StringBuilder();

for (int i = 0; i < digest.length; i++) {

String tempStr = Integer.toHexString(digest[i] & 0xff);

if (tempStr.length() == 1) {

buf.append("0").append(tempStr);

} else {

buf.append(tempStr);

}

}

return buf.toString().toLowerCase();

}

public static void main(String[] args) {

// System.out.println(DigestUtils.sha1Hex("123456"));

System.out.println(MessageDigestUtils.sha1("123456"));

}

}