Spring Boot 使用 AES 加密详解

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
 
@Component
public class AesUtil {
 
    @Value("${aes.key}")
    private String aesKey;
 
    public String encrypt(String data) throws Exception {
        Cipher cipher = Cipher.getInstance("AES");
        byte[] keyBytes = new byte[16];
        System.arraycopy(aesKey.getBytes(), 0, keyBytes, 0, Math.min(aesKey.getBytes().length, keyBytes.length));
        SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");
        cipher.init(Cipher.ENCRYPT_MODE, keySpec);
        byte[] encrypted = cipher.doFinal(data.getBytes());
        return Base64.getEncoder().encodeToString(encrypted);
    }
 
    public String decrypt(String encryptedData) throws Exception {
        Cipher cipher = Cipher.getInstance("AES");
        byte[] keyBytes = new byte[16];
        System.arraycopy(aesKey.getBytes(), 0, keyBytes, 0, Math.min(aesKey.getBytes().length, keyBytes.length));
        SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");
        cipher.init(Cipher.DECRYPT_MODE, keySpec);
        byte[] original = cipher.doFinal(Base64.getDecoder().decode(encryptedData));
        return new String(original);
    }
}

这段代码提供了一个简单的AES加密和解密工具类，使用方法也很简单，只需要在Spring Boot项目中注入这个类，然后调用其encrypt和decrypt方法即可。在实际使用中，需要注意的是，aes.key应该是一个安全的密钥，并且在配置文件中保护好，避免泄露。