package com.mstf.aes; import java.io.UnsupportedEncodingException;import java.security.InvalidKeyException;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; /** * AES加密解密 * @author ceet * */public class AESUntil {	/**	 * 加密	 * 	 *	 */	public static String Ecodes(String content, String key) {		if (content == null || content.length() < 1)			return null; 		try {			KeyGenerator kgen = KeyGenerator.getInstance("AES");			kgen.init(128, new SecureRandom(key.getBytes()));			SecretKey secretKey = kgen.generateKey();			byte[] enCodeFormat = secretKey.getEncoded();			SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");			Cipher cipher = Cipher.getInstance("AES");			byte[] byteContent = content.getBytes("utf-8");			cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);			byte[] byteRresult = cipher.doFinal(byteContent);			StringBuffer sb = new StringBuffer();			for (int i = 0; i < byteRresult.length; i++) {				String hex = Integer.toHexString(byteRresult[i] & 0xFF);				if (hex.length() == 1) {					hex = ‘0‘ + hex;				}				sb.append(hex.toUpperCase());			}			return sb.toString();		} catch (NoSuchAlgorithmException e) {			e.printStackTrace();		} catch (NoSuchPaddingException e) {			e.printStackTrace();		} catch (InvalidKeyException e) {			e.printStackTrace();		} catch (UnsupportedEncodingException e) {			e.printStackTrace();		} catch (IllegalBlockSizeException e) {			e.printStackTrace();		} catch (BadPaddingException e) {			e.printStackTrace();		}		return null;	} 	/**	 * 解密	 * 	 * 	 */	public static String Dcodes(String content, String key) {		if (content == null || content.length() < 1)			return null; 		if (content.trim().length() < 19)			return content; 		byte[] byteRresult = new byte[content.length() / 2];		for (int i = 0; i < content.length() / 2; i++) {			int high = Integer.parseInt(content.substring(i * 2, i * 2 + 1), 16);			int low = Integer.parseInt(content.substring(i * 2 + 1, i * 2 + 2), 16);			byteRresult[i] = (byte) (high * 16 + low);		}		try {			KeyGenerator kgen = KeyGenerator.getInstance("AES");			kgen.init(128, new SecureRandom(key.getBytes()));			SecretKey secretKey = kgen.generateKey();			byte[] enCodeFormat = secretKey.getEncoded();			SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");			Cipher cipher = Cipher.getInstance("AES");			cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);			byte[] result = cipher.doFinal(byteRresult);			return new String(result);		} 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;	} 	/**	 * 详细解释	 * 【ceet为加密的密匙】	 * 【admin为需要加密的字符串】	 * 【67BE5ED967DBA9B9810C295BE6DEF5D5为解密后的字符串】	 * 【如果更改ceet，那么67BE5ED967DBA9B9810C295BE6DEF5D5字符串会发生变化】	 * @param args	 */	// 调用测试	public static void main(String[] args) {		System.out.println("需要加密的内容："+Ecodes("admin", "ceet"));		System.out.println("经过解密的内容："+Dcodes("67BE5ED967DBA9B9810C295BE6DEF5D5", "ceet"));	}}