AES加密，解决了同步问题，和随机密钥和固定密钥，多端通信加密不一致解决办法

1、密钥随机生成。

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;

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.IvParameterSpec;

/**
* @ClassName: AESUtil
* @Description: 对cookie进行加密解密
* @author
* @date 2015-9-23 上午9:07:18
*
*/
public class AesUtils {

    public static final String logalrithm = "AES/CBC/PKCS5Padding";

    private static byte[] keyValue = new byte[] {
        22,25,-35,-45,25,98,-55,-45,10,20,-45,25,
        26,-95,25,-65,-11,-99,85,45,-62,10,-0,11,
        -35,48,-98,65,-32,14,-78,25,36,-56,-45,-45,
        12,15,-35,-75,15,-14,62,-25,33,-45,55,68,-88
    };
    private static byte[] iv = new byte[] {
        -12,35,-25,65,45,-87,95,-22,-15,45,55,-66,32,5-4,84,55
    };
    private static SecretKey key;
    private static AlgorithmParameterSpec paramSpec;                         

    static{
        KeyGenerator kgen;
        try {
            kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(keyValue));
            key = kgen.generateKey();
            paramSpec = new IvParameterSpec(iv);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }

    /**
    * @Title: encrypt
    * @Description: 加密，使用指定数据源生成密钥，使用用户数据作为算法参数进行AES加密
    * @return String    返回类型
    * @param msg 加密的数据
    * @return
    * @date 2015-9-23 上午9:09:20
    * @throws
    */
    public static String encrypt(String msg) {
        String str = "";
        try {
            Cipher ecipher = Cipher.getInstance(logalrithm);
            ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
            str = asHex(ecipher.doFinal(msg.getBytes()));
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        }
        return str;
    }

    /**
    * @Title: decrypt
    * @Description: 解密，对生成的16进制的字符串进行解密
    * @return String    返回类型
    * @author WUWeidong
    * @param value
    * @return
    * @date 2015-9-23 上午9:10:01
    * @throws
    */
    public static String decrypt(String value) {
        try {
            Cipher ecipher = Cipher.getInstance(logalrithm);
            ecipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
            return new String(ecipher.doFinal(asBin(value)));
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        }
        return "";
    }

    /**
    * @Title: asHex
    * @Description: 将字节数组转换成16进制字符串
    * @return String    返回类型
    * @param buf
    * @return
    * @date 2015-9-23 上午9:10:25
    * @throws
    */
    private static String asHex(byte[] buf) {
        StringBuffer strbuf = new StringBuffer(buf.length * 2);
        int i;
        for (i = 0; i < buf.length; i++) {
            if (((int) buf[i] & 0xff) < 0x10){
                strbuf.append("0");
            }
            strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
        }
        return strbuf.toString();
    }

    /**
    * @Title: asBin
    * @Description: 将16进制字符串转换成字节数组
    * @return byte[]    返回类型
    * @author WUWeidong
    * @param src
    * @return
    * @date 2015-9-23 上午9:10:52
    * @throws
    */
    private static byte[] asBin(String src) {
        if (src.length() < 1){
            return null;
        }
        byte[] encrypted = new byte[src.length() / 2];
        for (int i = 0; i < src.length() / 2; i++) {
            int high = Integer.parseInt(src.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(src.substring(i * 2 + 1, i * 2 + 2), 16);
            encrypted[i] = (byte) (high * 16 + low);
        }
        return encrypted;
    }

    public static void main(String[] args) {
        String msg="897807300";
        System.out.println(encrypt(msg));
        System.out.println(decrypt(encrypt(msg)));
    }
}

2、密钥固定，加密通信的时候可以使用

package com.cmcc.omp.securityplatform.base;
import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

/**
* @ClassName: AESUtil
* @Description: 对cookie进行加密解密
* @date 2015-9-23 上午9:07:18
*
*/
public class AesUtils {

    public static final String logalrithm = "AES/CBC/PKCS5Padding";
    public static final String bm = "utf-8";
    private static byte[] keyValue = new byte[] {
        22,-35,-45,25,98,-55,-45,10,35,-45,25,26,-95,25,-35,48
    };
    private static byte[] iv = new byte[] {
        -12,35,-25,65,45,-87,95,-22,-15,45,55,-66,32,5-4,84,55
    };

    private static Key keySpec;
    private static IvParameterSpec ivSpec;                     

    static{
        keySpec = new SecretKeySpec(keyValue, "AES");
        ivSpec = new IvParameterSpec(iv);
    }    

    /**
    * @Title: encrypt
    * @Description: 加密，使用指定数据源生成密钥，使用用户数据作为算法参数进行AES加密
    * @return String    返回类型
    * @param msg 加密的数据
    * @return
    * @date 2015-9-23 上午9:09:20
    * @throws
    */
    public static String encrypt(String msg) {
        byte[] encryptedData = null;
        try {
            Cipher ecipher = Cipher.getInstance(logalrithm);
            ecipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
            encryptedData = ecipher.doFinal(msg.getBytes(bm));
        } catch (IllegalBlockSizeException | BadPaddingException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return asHex(encryptedData);
    }

    /**
    * @Title: decrypt
    * @Description: 解密，对生成的16进制的字符串进行解密
    * @return String    返回类型
    * @param value
    * @return
    * @date 2015-9-23 上午9:10:01
    * @throws
    */
    public static String decrypt(String value) {
        try {
            Cipher ecipher = Cipher.getInstance(logalrithm);
            ecipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
            return new String(ecipher.doFinal(asBin(value)));
        } catch (BadPaddingException e) {
            System.out.println("解密错误："+value);
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            System.out.println("解密错误："+value);
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        }
        return "";
    }

    /**
    * @Title: asHex
    * @Description: 将字节数组转换成16进制字符串
    * @return String    返回类型
    * @param buf
    * @return
    * @date 2015-9-23 上午9:10:25
    * @throws
    */
    private static String asHex(byte[] buf) {
        StringBuffer strbuf = new StringBuffer(buf.length * 2);
        int i;
        for (i = 0; i < buf.length; i++) {
            if (((int) buf[i] & 0xff) < 0x10){
                strbuf.append("0");
            }
            strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
        }
        return strbuf.toString();
    }

    /**
    * @Title: asBin
    * @Description: 将16进制字符串转换成字节数组
    * @return byte[]    返回类型
    * @param src
    * @return
    * @date 2015-9-23 上午9:10:52
    * @throws
    */
    private static byte[] asBin(String src) {
        if (src.length() < 1){
            return null;
        }
        byte[] encrypted = new byte[src.length() / 2];
        for (int i = 0; i < src.length() / 2; i++) {
            int high = Integer.parseInt(src.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(src.substring(i * 2 + 1, i * 2 + 2), 16);
            encrypted[i] = (byte) (high * 16 + low);
        }
        return encrypted;
    }

    public static void main(String[] args) {
        String userid = "897807300@qq.com";
        String token = "8aa8690f65f080aee595d8781e7044a7eacda7a86520786db0838136554920b6";
        System.out.println(encrypt(userid));
        System.out.println(decrypt(encrypt(userid)));
    }

}