1 import java.security.SecureRandom;  2   3 import javax.crypto.Cipher;  4 import javax.crypto.KeyGenerator;  5 import javax.crypto.SecretKey;  6 import javax.crypto.spec.SecretKeySpec;  7   8 /**  9  * AES加密 10  * 11  */ 12 public class AESUtils { 13  14   /** 15    * 解密 16    * 17    * @param content 待解密内容 18    * @param password 解密密钥 19    * @return 20    */ 21   public static byte[] decrypt(byte[] content, String password) { 22     try { 23       KeyGenerator kgen = KeyGenerator.getInstance("AES"); 24       kgen.init(128, new SecureRandom(password.getBytes())); 25       SecretKey secretKey = kgen.generateKey(); 26       byte[] enCodeFormat = secretKey.getEncoded(); 27       SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); 28       Cipher cipher = Cipher.getInstance("AES");// 创建密码器 29       cipher.init(Cipher.DECRYPT_MODE, key);// 初始化 30       byte[] result = cipher.doFinal(content); 31       return result; // 加密 32     } 33     catch (Exception e) { 34       e.printStackTrace(); 35     } 36     return null; 37   } 38  39   public static byte[] encrypt(String content, String password) { 40     try { 41       KeyGenerator kgen = KeyGenerator.getInstance("AES"); 42       kgen.init(128, new SecureRandom(password.getBytes())); 43       SecretKey secretKey = kgen.generateKey(); 44       byte[] enCodeFormat = secretKey.getEncoded(); 45       SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES"); 46       Cipher cipher = Cipher.getInstance("AES");// 创建密码器 47       byte[] byteContent = content.getBytes("utf-8"); 48       cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化 49       byte[] result = cipher.doFinal(byteContent); 50       return result; // 加密 51     } 52     catch (Exception e) { 53       e.printStackTrace(); 54     } 55     return null; 56   } 57  58   public static void main(String[] args) { 59     String content = "给我加密把"; 60     String password = "这是加密密钥"; 61     // 加密 62     System.out.println("加密前：" + content); 63     byte[] encryptResult = AESUtils.encrypt(content, password); 64     String encryptResultStr = AESUtils.parseByte2HexStr(encryptResult); 65     System.out.println("加密后：" + encryptResultStr); 66     // 解密 67     byte[] decryptFrom = AESUtils.parseHexStr2Byte(encryptResultStr); 68     byte[] decryptResult = AESUtils.decrypt(decryptFrom, password); 69     System.out.println("解密后：" + new String(decryptResult)); 70   } 71  72   /** 73    * 将二进制转换成16进制 74    * 75    * @param buf 76    * @return 77    */ 78   public static String parseByte2HexStr(byte buf[]) { 79     StringBuffer sb = new StringBuffer(); 80     for (int i = 0; i < buf.length; i++) { 81       String hex = Integer.toHexString(buf[i] & 0xFF); 82       if (hex.length() == 1) { 83         hex = '0' + hex; 84       } 85       sb.append(hex.toUpperCase()); 86     } 87     return sb.toString(); 88   } 89  90   /** 91    * 将16进制转换为二进制 92    * 93    * @param hexStr 94    * @return 95    */ 96   public static byte[] parseHexStr2Byte(String hexStr) { 97     if (hexStr.length() < 1) { 98       return null; 99     }100     byte[] result = new byte[hexStr.length() / 2];101     for (int i = 0; i < hexStr.length() / 2; i++) {102       int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);103       int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);104       result[i] = (byte) (high * 16 + low);105     }106     return result;107   }108 }

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