在java中进行加密的正确方法

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.Key;

public class EncryptionExample {
    public static void main(String[] args) throws Exception {
        String plaintext = "Hello, World!";
        
        // 生成AES密钥
        KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
        keyGenerator.init(128); // 指定密钥长度为128位
        SecretKey secretKey = keyGenerator.generateKey();
        
        // 获取密钥的字节数组
        byte[] keyBytes = secretKey.getEncoded();
        
        // 根据密钥字节数组生成AES密钥
        Key key = new SecretKeySpec(keyBytes, "AES");
        
        // 创建加密器
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        
        // 执行加密操作
        byte[] ciphertext = cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));
        
        System.out.println("加密结果：" + new String(ciphertext, StandardCharsets.UTF_8));
    }
}