Spring java config来调用具有私有构造函数的单例类的公共非静态方法。

@Configuration
public class AppConfig {
    
    @Bean
    public SingletonClass singletonClass() {
        return SingletonClass.getInstance();
    }
    
    // 其他配置和组件定义...
}

@Component
public class OtherComponent {
    
    @Autowired
    private SingletonClass singletonClass;
    
    public void doSomething() {
        singletonClass.publicMethod();
    }
}

public class SingletonClass {
    
    private static SingletonClass instance;
    
    private SingletonClass() {
        // 私有构造函数
    }
    
    public static SingletonClass getInstance() {
        if (instance == null) {
            instance = new SingletonClass();
        }
        return instance;
    }
    
    public void publicMethod() {
        // 公共非静态方法
    }
}