Java 后端，选择

技术博文，及时送达

来源 | my.oschina.net/u/4 139 951/blog/3077236

作者 | 爱编程的浪子

一、工具类

1. md5加密工具类

2. base 64 加密工具类

3. Bcrypt工具类

二、加密测试

1. MD5加密测试

2. base 64 加密测试

3. SHA 加密测试

4. BCrypt加密测试

一、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 = ;   try{   resultString = new String(origin);   MessageDigest md = MessageDigest.getInstance("MD5");   if( == 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. base 64 加密工具类

 public class Base 64 Util {  
  //  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 ( == inputData) {   return ;   }   return new String(Base 64 .decodeBase 64 (inputData.getBytes(UTF_8)), UTF_8);   } catch (UnsupportedEncodingException e) {   }   return ;   }  
  /**   * 解密加密后的字符串   * @param inputData   * @return   */   public static String encodeData(String inputData) {   try {   if ( == inputData) {   return ;   }   return new String(Base 64 .encodeBase 64 (inputData.getBytes(UTF_8)), UTF_8);   } catch (UnsupportedEncodingException e) {   }   return ;   }  
  public static void main(String[] args) {   System.out.println(Base 64 Util.encodeData("我是中文"));   String enStr = Base 64 Util.encodeData("我是中文");   System.out.println(Base 64 Util.decodeData(enStr));   }  }  

3. Bcrypt工具类

 public class BcryptCipher {   // generate salt seed   private static final int SALT_SEED = 12;   // the head fo salt   private 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;   }  }  

二、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. base 64 加密测试

 /**   * base 64 加密   */  public class Bast 64 Tester {   public static void main(String[] args) {   String string = "我是一个字符串";   String encodeData = Base 64 Util.encodeData(string); //加密   String decodeData = Base 64 Util.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) {   String string = "我是一句话";   Map<String, String> bcrypt = BcryptCipher.Bcrypt(string);   System.out.println(bcrypt.keySet); //[cipher, salt]   System.out.println(bcrypt.get("cipher")); //$2a$12$ylb92Z84gqlrSfzIztlCV.dK0xNbw.pOv3U wX XA76llOsNRTJsE/.   System.out.println(bcrypt.get("salt")); //$2a$12$ylb92Z84gqlrSfzIztlCV.   Map<String, String> bcrypt2 = BcryptCipher.Bcrypt(bcrypt.get("salt"),string);   System.out.println(bcrypt2.get("SALT_KEY")); //   System.out.println(bcrypt2.get("CIPHER_KEY")); //   }  }  

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