md5工具使用方法（修改md5值的软件推荐）

0x01：工具类

• md5加密工具类
• base64加密工具类
• Bcrypt工具类

0x02：加密测试

• MD5加密测试
• base64加密测试
• SHA加密测试
• BCrypt加密测试

0x03、工具类

1. md5加密工具类

public class MD5Utils {private static final String hexDigIts[] = {\"0\",\"1\",\"2\",\"3\",\"4\",\"5\",\"6\",\"7\",\"8\",\"9\",\"a\",\"b\",\"c\",\"d\",\"e\",\"f\"};/** * MD5加密 * @param origin 字符 * @param charsetname 编码 * @return */public static String MD5Encode(String origin, String charsetname){ String resultString = null;try{ resultString = new String(origin); MessageDigest md = MessageDigest.getInstance(\"MD5\");if(null == charsetname || \"\".equals(charsetname)){ resultString = byteArrayToHexString(md.digest(resultString.getBytes())); }else{ resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname))); } }catch (Exception e){ }return resultString; }public static String byteArrayToHexString(byte b[]){ StringBuffer resultSb = new StringBuffer();for(int i = 0; i < b.length; i++){ resultSb.append(byteToHexString(b[i])); }return resultSb.toString(); }public static String byteToHexString(byte b){int n = b;if(n < 0){ n += 256; }int d1 = n / 16;int d2 = n % 16;return hexDigIts[d1] + hexDigIts[d2]; }}

2. base64加密工具类

public class Base64Util {// 字符串编码private static final String UTF_8 = \"UTF-8\";/** * 加密字符串 * @param inputData * @return */public static String decodeData(String inputData) {try {if (null == inputData) {return null; }return new String(Base64.decodeBase64(inputData.getBytes(UTF_8)), UTF_8); } catch (UnsupportedEncodingException e) { }return null; }/** * 解密加密后的字符串 * @param inputData * @return */public static String encodeData(String inputData) {try {if (null == inputData) {return null; }return new String(Base64.encodeBase64(inputData.getBytes(UTF_8)), UTF_8); } catch (UnsupportedEncodingException e) { }return null; }public static void main(String[] args) { System.out.println(Base64Util.encodeData(\"我是中文\"));String enStr = Base64Util.encodeData(\"我是中文\"); System.out.println(Base64Util.decodeData(enStr)); }}

3. Bcrypt工具类

public class BcryptCipher {// generate salt seedprivate static final int SALT_SEED = 12;// the head fo saltprivate static final String SALT_STARTSWITH = \"$2a$12\";public static final String SALT_KEY = \"salt\";public static final String CIPHER_KEY = \"cipher\";/** * Bcrypt encryption algorithm method * @param encryptSource * need to encrypt the string * @return Map , two values in Map , salt and cipher */public static Map<String, String> Bcrypt(final String encryptSource) {String salt = BCrypt.gensalt(SALT_SEED); Map<String, String> bcryptResult = Bcrypt(salt, encryptSource);return bcryptResult; }/** * * @param salt encrypt salt, Must conform to the rules * @param encryptSource * @return */public static Map<String, String> Bcrypt(final String salt, final String encryptSource) {if (StringUtils.isBlank(encryptSource)) {throw new RuntimeException(\"Bcrypt encrypt input params can not be empty\"); }if (StringUtils.isBlank(salt) || salt.length() != 29) {throw new RuntimeException(\"Salt can\'t be empty and length must be to 29\"); }if (!salt.startsWith(SALT_STARTSWITH)) {throw new RuntimeException(\"Invalid salt version, salt version is $2a$12\"); }String cipher = BCrypt.hashpw(encryptSource, salt); Map<String, String> bcryptResult = new HashMap<String, String>(); bcryptResult.put(SALT_KEY, salt); bcryptResult.put(CIPHER_KEY, cipher);return bcryptResult; }}

0x04：加密测试

1. MD5加密测试

/** * MD5加密 */public class MD5Test {public static void main(String[] args) { String string = \"我是一句话\"; String byteArrayToHexString = MD5Utils.byteArrayToHexString(string.getBytes()); System.out.println(byteArrayToHexString);//e68891e698afe4b880e58fa5e8af9d }}

2. base64加密测试

/** * base64加密 */public class Bast64Tester {public static void main(String[] args) { String string = \"我是一个字符串\"; String encodeData = Base64Util.encodeData(string); //加密 String decodeData = Base64Util.decodeData(encodeData); //解密 System.out.println(encodeData);//5oiR5piv5LiA5Liq5a2X56ym5Liy System.out.println(decodeData);//我是一个字符串  }}

3. SHA加密测试

/** * SHA加密 */public class ShaTest {public static void main(String[] args) { String string = \"我是一句话\"; String sha256Crypt = Sha2Crypt.sha256Crypt(string.getBytes()); System.out.println(sha256Crypt);//$5$AFoQTeyt$TiqmobvcQXjXaAQMYosAAO4KI8LfigZMGHzq.Dlp4NC }}

4. BCrypt加密测试

/** * BCrypt加密 */public class BCryptTest {public static void main(String[] args