Since you can mix constructor-based and setter-based DI, it is a good rule of thumb to use constructors for mandatory dependencies and setter methods or configuration methods for optional dependencies. 简单来说,就是 强制依赖就用构造器方式 可选、可变的依赖就用setter 注入 当然你可以在同一个类中...
Since you can mix constructor-based and setter-based DI, it is a good rule of thumb to use constructors for mandatory dependencies and setter methods or configuration methods for optional dependencies. 简单来说,就是 强制依赖就用构造器方式 可选、可变的依赖...
Spring 开发团队的建议 Since you can mix constructor-based and setter-based DI, it is a good rule of thumb to use constructors for mandatory dependencies and setter methods or configuration methods for optional dependencies. 简单来说,就是 强制依赖就用构造器方式 可选、可变的依赖就用setter 注入 当...
using an appropriate instantiation strategy: factory method, constructor autowiring, or simple instantiation.// 使用适当的实例化策略为指定的 bean 创建一个新实例:工厂方法、构造函数自动装配或简单实例化。protected
large numbers of constructor arguments can get unwieldy, especially when properties are optional. ...
The Spring team generally advocates setter injection, because large numbers of constructor arguments can get unwieldy, especially when properties are optional. Setter methods also make objects of that class amenable to reconfiguration or re-injection later. Management throughJMX MBeansis a compelling use...
The Spring team generally advocates setter injection, because large numbers of constructor arguments can get unwieldy, especially when properties are optional. Setter methods also make objects of that class amenable to reconfiguration or re-injection later. Management throughJMX MBeansis a compelling use...
构造器注入和Setter注入是依赖注入(Dependency Injection,DI)中两种常见的方式,用于向一个对象注入其所依赖的其他对象或数值。这两种注入方式有各自的特点和用途。 构造器注入(Constructor Injection): 在构造器注入中,依赖关系通过类的构造函数传递。这意味着在创建对象时,依赖的对象实例会作为构造函数的参数传递进来。
或者,您可以通过Java 8的java.util.Optional表达特定依赖项的非必需特性,如以下示例所示:public class SimpleMovieLister { @Autowired public void setMovieFinder(Optional<MovieFinder> movieFinder) { ... } }从Spring Framework 5.0开始,您还可以使用@Nullable 注解(任何包中的任何类型,例如,来自JSR-305的 ...
// 所需要的类型是Optional,包装成Optional对象,核心调用的也是doResolveDependency if (Optional.class == descriptor.getDependencyType()) { return createOptionalDependency(descriptor, requestingBeanName); } // 所需要的的类型是ObjectFactory,或ObjectProvider else if (ObjectFactory.class == descriptor.getDepende...