不说别的，直接上代码：

　　import it.sauronsoftware.base64.Base64; import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import java.security.Security; import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec; import org.bouncycastle.jce.provider.BouncyCastleProvider; /** * java实现AES256加密解密 * 依赖说明： * bcprov-jdk15-133.jar：PKCS7Padding * javabase64-1.3.1.jar：base64 * local_policy.jar 和 US_export_policy.jar需添加到%JAVE_HOME%\jre\lib\security中（lib中版本适合jdk1.7） */ public class AES256 { public static byte[] encrypt(String content, String password) {try {//"AES"：请求的密钥算法的标准名称KeyGenerator kgen = KeyGenerator.getInstance("AES");//256：密钥生成参数；securerandom：密钥生成器的随机源SecureRandom securerandom = new SecureRandom(tohash256Deal(password));kgen.init(256, securerandom);//生成秘密（对称）密钥SecretKey secretKey = kgen.generateKey();//返回基本编码格式的密钥byte[] enCodeFormat = secretKey.getEncoded();//根据给定的字节数组构造一个密钥。enCodeFormat：密钥内容；"AES"：与给定的密钥内容相关联的密钥算法的名称SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");//将提供程序添加到下一个可用位置Security.addProvider(new BouncyCastleProvider());//创建一个实现指定转换的 Cipher对象，该转换由指定的提供程序提供。//"AES/ECB/PKCS7Padding"：转换的名称；"BC"：提供程序的名称Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC"); cipher.init(Cipher.ENCRYPT_MODE, key);byte[] byteContent = content.getBytes("utf-8");byte[] cryptograph = cipher.doFinal(byteContent);return Base64.encode(cryptograph);} catch (Exception e) {e.printStackTrace();}return null;} public static String decrypt(byte[] cryptograph, String password) {try {KeyGenerator kgen = KeyGenerator.getInstance("AES");SecureRandom securerandom = new SecureRandom(tohash256Deal(password));kgen.init(256, securerandom);SecretKey secretKey = kgen.generateKey();byte[] enCodeFormat = secretKey.getEncoded();SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");Security.addProvider(new BouncyCastleProvider());Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC"); cipher.init(Cipher.DECRYPT_MODE, key);byte[] content = cipher.doFinal(Base64.decode(cryptograph));return new String(content);} catch (Exception e) {e.printStackTrace();}return null;} private 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.app(hex.toUpperCase());}return sb.toString();} /*private 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;}*/private static byte[] tohash256Deal(String datastr) {try {MessageDigest digester=MessageDigest.getInstance("SHA-256");digester.update(datastr.getBytes());byte[] hex=digester.digest();return hex; } catch (NoSuchAlgorithmException e) {throw new RuntimeException(e.getMessage()); }}public static void main(String[] args) { String content = "0f607264fc6318a92b9e13c65db7cd3c";String password = "zsyy";System.out.println("明文：" + content);System.out.println("key：" + password);byte[] encryptResult = AES256.encrypt(content, password);System.out.println("密文：" + AES256.parseByte2HexStr(encryptResult));String decryptResult = AES256.decrypt(encryptResult, password);System.out.println("解密：" + decryptResult);}}

　　运行截图：