AES加密，就是对称加密。分享牛系列，分享牛专栏，分享牛。客户端可以保存一个密钥，调用加密的值传入需要加密的值，然后程序根据密钥算出一个新的值，当然了解密也需要，对应的密钥才可以解密。

写一个程序如下：

/** * */ import org.apache.commons.codec.binary.Base64;import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec; import java.util.HashMap;import java.util.Map; /** * @author qq 1515308 */public class AESEncrypter {public static void main(String[] args) {String encryptAsString = new AESEncrypter().encrypt("qq:1515308");System.out.println(encryptAsString);String decryptAsString = new AESEncrypter().decryptAsString(encryptAsString);System.out.println(decryptAsString);}     private static String aesKeyStr = "NGQxNmUwMjM4M2Y0MTI2MTM3NDI0Y2MxMjA1N2IyNDM=";     private SecretKey aesKey;     private AESEncrypter() {        aesKey = loadAesKey();    }     private AESEncrypter(String aes) {        aesKey = loadAesKey(aes);    }     private static AESEncrypter INSTANCE;     private static Map
    
      INSTANCES = new HashMap<>();     public static AESEncrypter getInstance() {        if (INSTANCE == null) {            synchronized (aesKeyStr) {                if (INSTANCE == null) {                    INSTANCE = new AESEncrypter();                }            }        }        return INSTANCE;    }     public static AESEncrypter getInstance(String aes) {        if (INSTANCES.get(aes) == null) {            synchronized (aesKeyStr) {                if (INSTANCES.get(aes) == null) {                    INSTANCES.put(aes, new AESEncrypter(aes));                }            }        }        return INSTANCES.get(aes);    }     public String encrypt(String msg) {        try {            Cipher ecipher = Cipher.getInstance("AES");            ecipher.init(Cipher.ENCRYPT_MODE, aesKey);            return Encrypter.toHexString(ecipher.doFinal(msg.getBytes()));        } catch (Exception e) {            String errMsg = "decrypt error, data:" + msg;            throw new EncrypterException(errMsg, e);        }    }     public byte[] decrypt(String msg) {        try {            Cipher dcipher = Cipher.getInstance("AES");            dcipher.init(Cipher.DECRYPT_MODE, aesKey);            return dcipher.doFinal(Encrypter.toBytes(msg));        } catch (Exception e) {            String errMsg = "decrypt error, data:" + msg;            throw new EncrypterException(errMsg, e);        }    }     public String decryptAsString(String msg) {        return new String(this.decrypt(msg));    }     private static SecretKey loadAesKey() {        String buffer = new String(Base64.decodeBase64(aesKeyStr));        byte[] keyStr = Encrypter.toBytes(buffer);        SecretKeySpec aesKey = new SecretKeySpec(keyStr, "AES");        return aesKey;    }     private static SecretKey loadAesKey(String aesKeyStr) {        String buffer = new String(Base64.decodeBase64(aesKeyStr));        byte[] keyStr = Encrypter.toBytes(buffer);        SecretKeySpec aesKey = new SecretKeySpec(keyStr, "AES");        return aesKey;    }}
    

程序的输出如下：

ac8f63257d3d0e85844b4d74269bd153

qq:1515308

加密解密是OK的。

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