Java获取字符串(16bit,32bit)和文件MD5工具

自己搜集整理的MD5的Java工具类，支持16位32位64位的字符串大小写MD5,使用Apache的库实现文件的MD5

还有很多整理的工具类，项目地址:https://github.com/KingBoyWorld/aurora.git，下载后切换到utils_feature分支，Common模块中有相应的工具包。

package com.kingboy.common.utils.md5;import org.apache.commons.codec.digest.DigestUtils;import org.apache.poi.util.IOUtils;import sun.misc.BASE64Encoder;import java.io.*;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;/** * MD5，String-File * @Author kingboy * @Date 2017/7/22 下午1:00 * @Description MD5Utils is used to */public class MD5Utils {    private static final String ALGORITHM_MD5 = "MD5";    private static final String UTF_8 = "UTF-8";    /**     * MD5 16bit 小写.     * @param readyEncryptStr ready encrypt string     * @return String encrypt result string     * @throws NoSuchAlgorithmException     * */    public static final String MD5_16bit_lower(String readyEncryptStr) throws NoSuchAlgorithmException {        if(readyEncryptStr != null){            return MD5Utils.MD5_32bit_lower(readyEncryptStr).substring(8, 24);        }else{            return null;        }    }    /**     * MD5 16bit 大写.     * @param readyEncryptStr ready encrypt string     * @return String encrypt result string     * @throws NoSuchAlgorithmException     * */    public static final String MD5_16bit_upper(String readyEncryptStr) throws NoSuchAlgorithmException {        return MD5_16bit_lower(readyEncryptStr).toUpperCase();    }    /**     * MD5 32bit 小写.     * @param readyEncryptStr ready encrypt string     * @return String encrypt result string     * @throws NoSuchAlgorithmException     * */    public static final String MD5_32bit_lower(String readyEncryptStr) throws NoSuchAlgorithmException{        if(readyEncryptStr != null){            //Get MD5 digest algorithm's MessageDigest's instance.            MessageDigest md = MessageDigest.getInstance(ALGORITHM_MD5);            //Use specified byte update digest.            md.update(readyEncryptStr.getBytes());            //Get cipher text            byte [] b = md.digest();            //The cipher text converted to hexadecimal string            StringBuilder su = new StringBuilder();            //byte array switch hexadecimal number.            for(int offset = 0,bLen = b.length; offset < bLen; offset++){                String haxHex = Integer.toHexString(b[offset] & 0xFF);                if(haxHex.length() < 2){                    su.append("0");                }                su.append(haxHex);            }            return su.toString();        }else{            return null;        }    }    /**     * MD5 32bit 大写.     * @param readyEncryptStr ready encrypt string     * @return String encrypt result string     * @throws NoSuchAlgorithmException     * */    public static final String MD5_32bit_upper(String readyEncryptStr) throws NoSuchAlgorithmException{        return MD5_32bit_lower(readyEncryptStr).toUpperCase();    }    /**     * MD5 64bit 大写.     * @param readyEncryptStr ready encrypt string     * @return String encrypt result string     * @throws NoSuchAlgorithmException     * @throws UnsupportedEncodingException     * */    public static final String MD5_64bit(String readyEncryptStr) throws NoSuchAlgorithmException, UnsupportedEncodingException {        MessageDigest md = MessageDigest.getInstance(ALGORITHM_MD5);        BASE64Encoder base64Encoder = new BASE64Encoder();        return base64Encoder.encode(md.digest(readyEncryptStr.getBytes(UTF_8)));    }    /**     * 获取文件MD5,使用apache的org.apache.commons.codec.digest.DigestUtils;     * @param filePath 文件路径     * @return String     */    public static String MD5_File(String filePath) throws Exception {        try (FileInputStream fis= new FileInputStream(filePath)) {            return DigestUtils.md5Hex(IOUtils.toByteArray(fis));        }    }    public static void main(String[] args) throws Exception {         System.out.println("16位小写:" + MD5Utils.MD5_16bit_lower("king"));         System.out.println("16位大写:" + MD5Utils.MD5_16bit_upper("king"));         System.out.println("32位小写:" + MD5Utils.MD5_32bit_lower("king"));         System.out.println("32位大写:" + MD5Utils.MD5_32bit_upper("king"));         System.out.println("64位大写:" + MD5Utils.MD5_64bit("king"));         System.out.println("FILEMD5:" + MD5Utils.MD5_File("/Users/kingboy/Desktop/1.txt"));    }}