JAVA MD5加密工具类

落日映苍穹つ 2022-03-16 15:30 318阅读 0赞

import java.io.UnsupportedEncodingException;
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    
    
    /**
     * @Author: JCccc
     * @CreateTime: 2018-10-30
     * @Description:
     */
    public class Md5Encrypt {
    
        private static final char[] DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a',
                'b', 'c', 'd', 'e', 'f'};
    
        /**
         * 对字符串进行MD5加密
         *
         * @param text 明文
         * @return 密文
         */
        public static String md5(String text) {
            MessageDigest msgDigest = null;
    
            try {
                msgDigest = MessageDigest.getInstance("MD5");
            } catch (NoSuchAlgorithmException e) {
                throw new IllegalStateException("System doesn't support MD5 algorithm.");
            }
    
            try {
                msgDigest.update(text.getBytes("UTF-8")); // 注意该接口是按照指定编码形式签名
    
            } catch (UnsupportedEncodingException e) {
    
                throw new IllegalStateException("System doesn't support your  EncodingException.");
    
            }
    
            byte[] bytes = msgDigest.digest();
    
            String md5Str = new String(encodeHex(bytes));
    
            return md5Str;
        }
    
        private static char[] encodeHex(byte[] data) {
    
            int l = data.length;
    
            char[] out = new char[l << 1];
            // two characters form the hex value.
            for (int i = 0, j = 0; i < l; i++) {
                out[j++] = DIGITS[(0xF0 & data[i]) >>> 4];
                out[j++] = DIGITS[0x0F & data[i]];
            }
    
            return out;
        }
    }
       /* public static void main(String[] args) {
            System.out.println(Md5Encrypt.md5(Md5Encrypt.md5("123456" + "ffff")));
        }
    
    }
    */