1、通用方法

package com.qlkj.hzd.commom.utils;

import javax.crypto.*;
import java.io.UnsupportedEncodingException;
import java.security.*;

/**
 * RSA相關工具類
 *
 * @author vampire
 * @date 2018/10/12 下午5:33
 */
public class EncrypAES {

    //KeyGenerator                提供對稱密鑰生成器的功能，支持各種算法
    private static KeyGenerator keygen;
    
 
//SecretKey                負責保存對稱密鑰
    private static SecretKey deskey;
    //Cipher負責完成加密或解密工作
    private static Cipher c;
    //該字節數組負責保存加密的結果
    private static byte[] cipherByte;

    static {
        try {
            Security.addProvider(new com.sun.crypto.provider.SunJCE());
            //實例化支持DES算法的密鑰生成器(算法名稱命名需按規定，否則拋出異常)
 

            keygen = KeyGenerator.getInstance("AES");
            //生成密鑰
            deskey = keygen.generateKey();
            //生成Cipher對象,指定其支持的DES算法
            c = Cipher.getInstance("AES");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        }

    }

    
 
/**
     * 對字符串加密
     *
     * @param str
     * @return
     * @throws InvalidKeyException
     * @throws IllegalBlockSizeException
     * @throws BadPaddingException
     */
    public static String Encrytor(String str) throws InvalidKeyException,
            IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
        //                根據密鑰，對Cipher對象進行初始化，ENCRYPT_MODE表示加密模式
        c.init(Cipher.ENCRYPT_MODE, deskey);
        byte[] src = str.getBytes("utf-8");
        //                加密，結果保存進cipherByte
        cipherByte = c.doFinal(src);
        return parseByte2HexStr(cipherByte);
    }

    /**
     * 對字符串解密
     *
     * @param str
     * @return
     * @throws InvalidKeyException
     * @throws IllegalBlockSizeException
     * @throws BadPaddingException
     */
    public static String Decryptor(String str) throws InvalidKeyException,
            IllegalBlockSizeException, BadPaddingException {
        //                根據密鑰，對Cipher對象進行初始化，DECRYPT_MODE表示加密模式
        c.init(Cipher.DECRYPT_MODE, deskey);
        cipherByte = c.doFinal(parseHexStr2Byte(str));
        return new String(cipherByte);
    }

    /**
     * 將16進制轉換為二進制
     * *  @param  hexStr
     * *  @return
     */
    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1) {
            return null;
        }
        byte[] result = new byte[hexStr.length() / 2];
        for (int i = 0; i < hexStr.length() / 2; i++) {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }


    /**
     * 將二進制轉換成16進制
     *
     * @param buf
     * @return
     */
    public static String parseByte2HexStr(byte buf[]) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = ‘0‘ + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

}

2、添加密碼加解密

public static byte[] decrypt(byte[] content, String password) {
        try {
                 KeyGenerator kgen = KeyGenerator.getInstance("AES");
                 kgen.init(128, new SecureRandom(password.getBytes()));
                 SecretKey secretKey = kgen.generateKey();
                 byte[] enCodeFormat = secretKey.getEncoded();
                 SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");           
                 Cipher cipher = Cipher.getInstance("AES");// 創建密碼器
                cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
                byte[] result = cipher.doFinal(content);
                return result; // 加密
        } 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;
}

java AES 加密解密工具（Advanced Encryption Standard）