本文實例為大家分享了一個適用於JavaSE/JavaEE/Android的Java加密解密工具，供大家學習，具體內容如下
package longshu.utils.security; import java.lang.reflect.Method;import java.security.InvalidKeyException;import java.security.Key;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom; import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchPaddingException;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec; /** * Java加密解密工具. * JavaSE/JavaEE/Android都適用* * @author longshu 2016年4月13日*/public class EncryptDecrypt { // 無需創建對象private EncryptDecrypt() { } /** * SHA1加密Bit數據* @param source byte數組* @return 加密後的byte數組*/ public static byte[] SHA1Bit(byte[] source) { try { MessageDigest sha1Digest = MessageDigest.getInstance("SHA-1"); sha1Digest.update(source); byte targetDigest[] = sha1Digest.digest(); return targetDigest; } catch (NoSuchAlgorithmException e) { throw new RuntimeException(e); } } /** * SHA1加密字符串數據* @param source 要加密的字符串* @return 加密後的字符串*/ public static String SHA1(String source) { return byte2HexStr(SHA1Bit(source.getBytes())); } /** * MD5加密Bit數據* @param source byte數組* @return 加密後的byte數組*/ public static byte[] MD5Bit(byte[] source) { try { // 獲得MD5摘要算法的MessageDigest對象MessageDigest md5Digest = MessageDigest.getInstance("MD5"); // 使用指定的字節更新摘要md5Digest.update(source); // 獲得密文return md5Digest.digest(); } catch (NoSuchAlgorithmException e) { throw new RuntimeException(e); } } /** * MD5加密字符串,32位長* @param source 要加密的內容* @return 加密後的內容*/ public static String MD5(String source) { return byte2HexStr(MD5Bit(source.getBytes())); } /** * BASE64編碼* @param source 要編碼的字符串* @return 編碼過的字符串*/ public static String encodeBASE64(String source) { Class<?> clazz = null; Method encodeMethod = null; try {// 優先使用第三方庫clazz = Class.forName("org.apache.commons.codec.binary.Base64"); encodeMethod = clazz.getMethod("encodeBase64", byte[].class); System.out.println("encodeBASE64-->" + clazz); System.out.println("encodeMethod-->" + encodeMethod); // 反射方法靜態方法執行無需對象return new String((byte[]) encodeMethod.invoke(null, source.getBytes())); } catch (ClassNotFoundException e) { String vm = System.getProperty("java.vm.name"); System.out.println(vm); try { if ("Dalvik".equals(vm)) {// Android clazz = Class.forName("android.util.Base64"); // byte[] Base64.encode(byte[] input,int flags) encodeMethod = clazz.getMethod("encode", byte[].class, int.class); System.out.println("encodeBASE64-->" + clazz); System.out.println("encodeMethod-->" + encodeMethod); return new String((byte[]) encodeMethod.invoke(null, source.getBytes(), 0)); } else {// JavaSE/JavaEE clazz = Class.forName("sun.misc.BASE64Encoder"); encodeMethod = clazz.getMethod("encode", byte[].class); System.out.println("encodeBASE64-->" + clazz); System.out.println("encodeMethod-->" + encodeMethod); return (String) encodeMethod.invoke(clazz.newInstance(), source.getBytes()); } } catch (ClassNotFoundException e1) { return null; } catch (Exception e1) { return null; } } catch (Exception e) { return null; } /* * Android * android.util.Base64 */ // return Base64.encodeToString(source, Base64.DEFAULT); // return new String(Base64.encode(source.getBytes(), Base64.DEFAULT)); /* * JavaSE/JavaEE */ // sun.misc.BASE64Encoder // BASE64Encoder encoder = new BASE64Encoder(); // return encoder.encode(source.getBytes()); // org.apache.commons.codec.binary.Base64 // return new String(Base64.encodeBase64(source.getBytes())); } /** * BASE64解碼* @param encodeSource 編碼過的字符串* @return 編碼前的字符串*/ public static String decodeBASE64(String encodeSource) { Class<?> clazz = null; Method decodeMethod = null; try {// 優先使用第三方庫clazz = Class.forName("org.apache.commons.codec.binary.Base64"); decodeMethod = clazz.getMethod("decodeBase64", byte[].class); System.out.println("decodeBASE64-->" + clazz); System.out.println("decodeMethod-->" + decodeMethod); // 反射方法靜態方法執行無需對象return new String((byte[]) decodeMethod.invoke(null, encodeSource.getBytes())); } catch (ClassNotFoundException e) { String vm = System.getProperty("java.vm.name"); System.out.println(vm); try { if ("Dalvik".equals(vm)) {// Android clazz = Class.forName("android.util.Base64"); // byte[] Base64.decode(byte[] input, int flags) decodeMethod = clazz.getMethod("decode", byte[].class, int.class); System.out.println("decodeBASE64-->" + clazz); System.out.println("decodeMethod-->" + decodeMethod); return new String((byte[]) decodeMethod.invoke(null, encodeSource.getBytes(), 0)); } else { // JavaSE/JavaEE clazz = Class.forName("sun.misc.BASE64Decoder"); decodeMethod = clazz.getMethod("decodeBuffer", String.class); System.out.println("decodeBASE64-->" + clazz); System.out.println("decodeMethod-->" + decodeMethod); return new String((byte[]) decodeMethod.invoke(clazz.newInstance(), encodeSource)); } } catch (ClassNotFoundException e1) { return null; } catch (Exception e1) { return null; } } catch (Exception e) { return null; } /* * Android * android.util.Base64 */ // return new // String(Base64.decode(encodeSource.getBytes(),Base64.DEFAULT)); /* * JavaSE/JavaEE */ // sun.misc.BASE64Decoder // try { // BASE64Decoder decoder = new BASE64Decoder(); // return new String(decoder.decodeBuffer(encodeSource)); // } catch (IOException e) { // throw new RuntimeException(e); // } // org.apache.commons.codec.binary.Base64 // return new String(Base64.decodeBase64(encodeSource.getBytes())); } /** * AES加密* @param content 待加密的內容* @param password 加密密碼* @return */ public static byte[] encryptBitAES(byte[] content, String password) { try { Cipher encryptCipher = Cipher.getInstance("AES/ECB/PKCS5Padding");// 創建密碼器encryptCipher.init(Cipher.ENCRYPT_MODE, getKey(password));// 初始化byte[] result = encryptCipher.doFinal(content); return result; // 加密} catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } catch (InvalidKeyException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } return null; } /** * AES解密* @param content 待解密內容* @param password 解密密鑰* @return */ public static byte[] decryptBitAES(byte[] content, String password) { try { Cipher decryptCipher = Cipher.getInstance("AES/ECB/PKCS5Padding");// 創建密碼器decryptCipher.init(Cipher.DECRYPT_MODE, getKey(password));// 初始化byte[] result = decryptCipher.doFinal(content); return result; // 加密結果} catch (InvalidKeyException e) { e.printStackTrace(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } return null; } /** * AES字符串加密* @param content 待加密的內容* @param password 加密密碼* @return */ public static String encryptAES(String content, String password) { return byte2HexStr(encryptBitAES(content.getBytes(), password)); } /** * AES字符串解密* @param content 待解密內容* @param password 解密密鑰* @return */ public static String decryptAES(String content, String password) { return new String(decryptBitAES(hexStr2Bytes(content), password)); } /** * 從指定字符串生成密鑰* @param password 構成該秘鑰的字符串* @return 生成的密鑰* @throws NoSuchAlgorithmException */ private static Key getKey(String password) throws NoSuchAlgorithmException { SecureRandom secureRandom = new SecureRandom(password.getBytes()); // 生成KEY KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128, secureRandom); SecretKey secretKey = kgen.generateKey(); byte[] enCodeFormat = secretKey.getEncoded(); // 轉換KEY SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); return key; } /** * 將byte數組轉換為表示16進制值的字符串. * 如：byte[]{8,18}轉換為：0812 * 和byte[] hexStr2Bytes(String strIn) 互為可逆的轉換過程. * @param bytes 需要轉換的byte數組* @return 轉換後的字符串*/ public static String byte2HexStr(byte[] bytes) { int bytesLen = bytes.length; // 每個byte用兩個字符才能表示，所以字符串的長度是數組長度的兩倍StringBuffer hexString = new StringBuffer(bytesLen * 2); for (int i = 0; i < bytesLen; i++) { // 將每個字節與0xFF進行與運算，然後轉化為10進制，然後藉助於Integer再轉化為16進制String hex = Integer.toHexString(bytes[i] & 0xFF); if (hex.length() < 2) { hexString.append(0);// 如果為1位前面補個0 } hexString.append(hex); } return hexString.toString(); } /** * 將表示16進制值的字符串轉換為byte數組, * 和String byte2HexStr(byte[] bytes) 互為可逆的轉換過程. * @param bytes * @return 轉換後的byte數組*/ public static byte[] hexStr2Bytes(String strIn) { byte[] arrB = strIn.getBytes(); int iLen = arrB.length; // 兩個字符表示一個字節，所以字節數組長度是字符串長度除以2 byte[] arrOut = new byte[iLen / 2]; for (int i = 0; i < iLen; i = i + 2) { String strTmp = new String(arrB, i, 2); arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16); } return arrOut; } }以上就是本文的全部內容，希望對大家學習java程序設計有所幫助。