对称加密算法AES 工具类，拿来可用

package com.xiaojukeji.visitor.common.util;

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;

/**
 * <p>Description: [AES对称加密和解密]</p>
 * Created on 2017年11月28日 下午4:14:38
 * @author <a href="mailto: 15175223269@163.com">全冉</a>
 * @version 1.0 Copyright (c) 2017 全冉公司
 */
public class AESUtils {
	
	/**
	 * <p>Discription:[加密]</p>
	 * Created on 2017年11月28日 下午4:16:30
	 * @param content 明文 用JSON.toJSONString(Map<String, String> map)转换的json字符串
	 * @param key 加解密规则 访客系统提供key
	 * @return String 密文
	 * @author:[全冉]
	 */
	public static String ecodes(String content, String key) {
		if (content == null || content.length() < 1) {
			return null;
		}
		try {
			KeyGenerator kgen = KeyGenerator.getInstance("AES");
			SecureRandom random=SecureRandom.getInstance("SHA1PRNG");
			random.setSeed(key.getBytes());
			kgen.init(128, random);
			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;
	}

	/**
	 * <p>Discription:[解密]</p>
	 * Created on 2017年11月28日 下午4:17:49
	 * @param content 密文
	 * @param key 加解密规则
	 * @return String 明文
	 * @author:[全冉]
	 */
	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");
			SecureRandom random=SecureRandom.getInstance("SHA1PRNG");
			random.setSeed(key.getBytes());
			kgen.init(128, random);
			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;
	}
	
	public static void main(String[] args) {
		try {
//			样例一
//			Map<String, String> map = new HashMap<String, String>();
//			map.put("name_name", "_@quanran");
//			map.put("age@()", "16");
//			String mapStr = JSON.toJSONString(map);
//			System.out.println(mapStr);
//			
//			String miwen = AESUtils.ecodes(mapStr, "quanran");
//			System.out.println(miwen);
//			
//			String mingwen = AESUtils.dcodes(miwen, "quanran");
//			System.out.println(mingwen);
//			
//			Map<String, String> map2 = (Map<String, String>) JSON.parse(mingwen);
//			for (String key : map2.keySet()) {
//				System.out.println("key= "+ key + " and value= " + map.get(key));
//			}
			
//			样例二
			String miwen = AESUtils.ecodes("{"id":1759,"reservationId":1511867174251,"visitingPurpose":1,"officeBuildingId":1,"officeBuildingName":"1","cityId":1,"cityName":"1","reservationStatus":1,"visitorName":"1 ","visitorAreaCode":"1","visitorPhone":"1","visitorEmail":null,"remark":null,"visitingTime":1,"visitorNum":1,"visitingUnit":null,"messageNum":null,"photoUrl":null,"receptionUserName":"1","receptionUserDomainAccount":"1","visitingInvitationCode":null,"createUser":"1","createTime":1,"createUserDomainAccount":null,"updateTime":null,"signTime":null,"alreadySignedInNum":null,"alreadySignedOutNum":null,"accompanyPersons":null,"visitingReason":null,"field1":null,"field2":null,"field3":null,"field4":null,"field5":null,"approveStatus":1,"levelOneName":null,"levelTwoName":null,"createPlatform":1}",
					"2b72cc3d1426554818da16e13f6a249c");
			System.out.println("miwen : " + miwen);
			
			String mingwen = AESUtils.dcodes(miwen, "2b72cc3d1426554818da16e13f6a249c");
			System.out.println("mingwen : " + mingwen);
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}