JavaMD5加密工具类

缺乏、安全感 2021-10-29 10:26 306阅读 0赞

package com.iyuba.mytablayout.utils;
    
    import java.io.UnsupportedEncodingException;
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    /**
     * MD5校验
     *
     * @author 陈彤
     */
    public class MD5 {
        private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6',
                '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
    
        public static String getMD5ofStr(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"));
            } catch (UnsupportedEncodingException e) {
                throw new IllegalStateException(
                        "System doesn't support your  EncodingException.");
            }
    
            byte[] bytes = msgDigest.digest();
    
            String md5Str = new String(encodeHex(bytes));
    
            return md5Str;
        }
    
        public static String md5_16(String text) {
            return getMD5ofStr(text).substring(8, 24);
        }
    
        public static char[] encodeHex(byte[] data) {
            int l = data.length;
    
            char[] out = new char[l << 1];
    
            int i = 0;
            for (int j = 0; i < l; ++i) {
                out[(j++)] = DIGITS[((0xF0 & data[i]) >>> 4)];
                out[(j++)] = DIGITS[(0xF & data[i])];
            }
    
            return out;
        }
    }