AES256TextEncryptor encryptor = new AES256TextEncryptor();
encryptor.setPassword("some_salt");
String plainText = encryptor.decrypt(myEncryptedText);
System.out.println("Decrypted: "+plainText);

wget https://www.apache.org/dist/maven/maven-3/3.6.3/binaries/apache-maven-3.6.3-bin.tar.gz -P /tmp
sudo tar xf /tmp/apache-maven-*.tar.gz -C /opt
sudo update-alternatives --install /usr/bin/mvn mvn /opt/apache-maven-3.6.3/bin/mvn 363
sudo update-alternatives --config mvn

    // 定义SmartValidator
    @Bean
    @Primary
    public Validator myValidator() {
      return new LocalValidatorFactoryBean();
    }

    // 使用的时候注入SmartValidator, validationHints可以指定group
    smartValidator.validate(target, errors, validationHints);

// 默认校验只能单层, 如果自定义对象成员变量时, 就需要给成员变量加@Valid, 才能校验自定义对象里的内容

// 1. 定义HttpSessionEventPublisher
@Bean
public HttpSessionEventPublisher httpSessionEventPublisher() {
    return new HttpSessionEventPublisher();
}
// 2. 设置maximumSessions
@Bean
public SecurityFilterChain filterChain(HttpSecurity http) {
    http
        .sessionManagement(session -> session
            .maximumSessions(1)
        );
    return http.build();
}