AES是开发中常用的加密算法之一。AES的算法总是相同的， 但经常遇到前端加密结果，后台无法解密，这是因为加密设置的参数不一致导致的。如果要保持一致，必须使下列参数一致密钥长度、加密模式、填充方式、初始向量。
一、引入Java类
import javax.crypto.*;//AES加密解密import sun.misc.*;//BASE64转码
二、加密
/*** 加密*/public static String encrypt(String content,String CRYPT_KEY,String IV_STRING) {byte[] encryptedBytes = new byte[0];try {byte[] byteContent = content.getBytes("UTF-8");//keybyte[] enCodeFormat = CRYPT_KEY.getBytes();SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");//偏移量byte[] initParam = IV_STRING.getBytes();IvParameterSpec ivParameterSpec = new IvParameterSpec(initParam);// 指定加密的算法、工作模式和填充方式Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);encryptedBytes = cipher.doFinal(byteContent);} catch (Exception e) {System.out.println("AES encrypt Exception,content = {"+content+"},Exception = {"+e.getStackTrace()+"}");}return new BASE64Encoder().encode(encryptedBytes);}
三、解密
/*** 解密*/public static String decrypt(String content,String CRYPT_KEY,String IV_STRING) {try {// base64 解码byte[] encryptedBytes = new BASE64Decoder().decodeBuffer(content);//keybyte[] enCodeFormat = CRYPT_KEY.getBytes();SecretKeySpec secretKey = new SecretKeySpec(enCodeFormat, "AES");//偏移量byte[] initParam = IV_STRING.getBytes();IvParameterSpec ivParameterSpec = new IvParameterSpec(initParam);// 指定加密的算法、工作模式和填充方式Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");cipher.init(Cipher.DECRYPT_MODE, secretKey, ivParameterSpec);byte[] result = cipher.doFinal(encryptedBytes);return new String(result, "UTF-8");} catch (Exception e) {System.out.println( "AES decrypt Exception,content = {"+content+"},Exception = {"+e.getStackTrace()+"}");}return null;}
四、测试
public static void main(String[] args) {String CRYPT_KEY = "0123456789abcdef";//keyString IV_STRING = "0123456789abcdef";//偏移量String content = "12345";//原文System.out.println("原文："+content);String contenCrypt = encrypt(content.toString().replaceAll("(\r\n|\r|\n|\n\r)",""),CRYPT_KEY,IV_STRING);System.out.println("加密："+contenCrypt);System.out.println("解密："+decrypt(contenCrypt,CRYPT_KEY,IV_STRING));System.out.println("JS加密密文解密："+decrypt("xWngUO1XD+BavHm1YkdTxA==",CRYPT_KEY,IV_STRING));}
五、输出结果
Java后台加密解密与上一篇文章《数据AES加密安全传输之前端JS加密解密》对应
参考：/coyote1994/article/details/52368921
