dependency-injection

问题 In Spring , if there are two bean ids which refer to the same class and we just want to inject values from only one bean, then we normally use the following annotations in conjunction : @Autowired @Qualifier("bean1") How to achieve the same thing using the xml specification ? What is the alternative of using qualifier annotation in xml ? 回答1: Not an exact alternative but you can use autowire-candidate="false" to all those beans which you want to exclude from being autowired apart from the one

问题 I've looked at Ninject, StructureMap and Other Dependency Injection and Service Locator frameworks, but this question is more about learning how it works and what can be better. More to the point, I’m not interesting in looking at a Framework’s source code for Dependency Injection, but understanding how it’s achieved from beginning to end in practice/code. The code below is for a small internal project, so with that in mind let me begin. Here is my interface for returning Domain Models to my

问题 I build a project based on the ReaderT design pattern. Instead of using a typeclass approach for dependency injection, I choose to use simple injection of handlers as function arguments. This part works fine as one is able to construct a dependency tree statically and define an environment dynamically. The environment may contain configuration as well as a logging effect :: String -> IO () , an effect of time :: IO UTCDate etc. Consider the following minified example import Control.Monad

问题 I build a project based on the ReaderT design pattern. Instead of using a typeclass approach for dependency injection, I choose to use simple injection of handlers as function arguments. This part works fine as one is able to construct a dependency tree statically and define an environment dynamically. The environment may contain configuration as well as a logging effect :: String -> IO () , an effect of time :: IO UTCDate etc. Consider the following minified example import Control.Monad

问题 I'm trying to use the Unity Registration by Convention feature. I can't figure out how to register from specific assembly/project files with the file ending "Repository". container.RegisterTypes( AllClasses.FromAssembliesInBasePath(), WithMappings.FromMatchingInterface, WithName.Default, WithLifetime.ContainerControlled); I've found only this example from a MSDN blog ( https://blogs.msdn.microsoft.com/agile/2013/03/12/unity-configuration-registration-by-convention/ ) post and as I understand

问题 I am playing around with Spring Boot and I am trying to construct an instance of ServiceImpl to be resolved when a Service is required. Currently I am annotating the implementation as @Component but this does not give me the chance to construct the instance as I want. The ServiceImpl should be constructed with a String containing a path to a file on disk. I would like to do this in the main method of the @SpringBootApplication class of the application. Maybe it's just me coming from a long

问题 I am playing around with Spring Boot and I am trying to construct an instance of ServiceImpl to be resolved when a Service is required. Currently I am annotating the implementation as @Component but this does not give me the chance to construct the instance as I want. The ServiceImpl should be constructed with a String containing a path to a file on disk. I would like to do this in the main method of the @SpringBootApplication class of the application. Maybe it's just me coming from a long

问题 I am playing around with Spring Boot and I am trying to construct an instance of ServiceImpl to be resolved when a Service is required. Currently I am annotating the implementation as @Component but this does not give me the chance to construct the instance as I want. The ServiceImpl should be constructed with a String containing a path to a file on disk. I would like to do this in the main method of the @SpringBootApplication class of the application. Maybe it's just me coming from a long

问题 I have a bean with injected field value. It works just fine. I use annotation to ask Spring to inject value from properties into the bean. public class MyBean { @Value("${app.settings.value}") private String value; } How can I do the same via XML? I've tried to inject using value="#{}" . <bean id="myBean" class="com.test.MyBean"> <property name="value" value="{app.settings.value}"/> </bean> But my approach does not work. 回答1: Try this: <bean id="myBean" class="com.test.MyBean"> <property name

问题 I have a bean with injected field value. It works just fine. I use annotation to ask Spring to inject value from properties into the bean. public class MyBean { @Value("${app.settings.value}") private String value; } How can I do the same via XML? I've tried to inject using value="#{}" . <bean id="myBean" class="com.test.MyBean"> <property name="value" value="{app.settings.value}"/> </bean> But my approach does not work. 回答1: Try this: <bean id="myBean" class="com.test.MyBean"> <property name