spring factory pattern injection

I. Spring Spring is a container that describes the dependency between classes through configuration files or annotations to automatically initialize classes and inject dependencies, it allows developers to quickly get out of the instantiation and dependency assembly of these underlying implementation classes and focus on more meaningful business logic development, at the same time,

The interview in these days, I feel that the whole grasp of spring is still very weak. So we need to continue to strengthen.Here to explain the spring of these several aspects of the test, but the actual feeling is still wrong, this problem I think the need to really read the spring source code to say something to make sense. This kind of interview asks the law,

thrown, indicating that multiple beans of the same type exist:Caused by: org. springframework. beans. factory. noUniqueBeanDefinitionException: No qualifying bean of type [com. webpolicique. spring. domain. car] is defined: expected single matching bean but found 2: Ferari, Mustang At org. springframework. beans. factory. support. DefaultListableBeanFactory. doR

Speaking of advanced {Tagshow (Event)} "> Language programming, we will think {Tagshow (Event)} "> Design Pattern. When it comes to design patterns, we will talk about how to solve coupling. And spring. one of the IOC containers of net is decoupling. Its most typical application is dependency injection (DI), which is one of the best decoupling methods. Next I wil

Design model as a pillow in the work of learning, but often in the use of the awkward situation, is not that we often forget, but have no memory. Today, crabs in the IT Learner's website on the intrinsic value of design patterns to do some discussion, and take spring as an example to explain, only to appreciate the idea of its design, can be applied to work in the "invisible." Spring as the industry's c

Spring instantiates Bean using the static factory Method Knowledge Point introduction:Static factory, as its name implies, is to call the static factory method to obtain the desired objects. To allow spring to manage all objects, we cannot directly use engineering. the stati

. If the dependencies are more complex, then the constructors for constructing the sub-injection pattern will be quite large, while the value injection pattern is more concise. If a third-party class library is used, our component may be required to provide a default constructor, and the construction sub-

Knowledge Point Introduction:Static factory as the name implies, is to call the static factory method to obtain their own objects, in order to let spring management of all objects, we can not directly through the "Engineering class. Static method ()" To obtain the object, but still through the form of spring

This article mainly includes Bean Factory knowledge in spring. It mainly includes the following topics: 1. Bean factory at the beginning of getstart 2. Bean basic definition 3. Create a bean using the constructor 4. Create a bean using the static factory Method 5. Create a bean using a non-static

Dependency Injection1. Attribute InjectionProperty injection requires that the bean provide a default constructor and provide a corresponding setter for the property that needs to be injectedMethod. Spring invokes the Bean's default constructor to instantiate the Bean object and then calls it through the red reflectionThe setter method injects the property value. The first two letters of the variable are al

understand how Userdaoimpl is implemented. When we need to switch to another Userdao implementation class, we just need to change the code on the first line under the test class, and there's no need to change the usermessage inside.Think again, the reader may say wrong ah, you say control inversion and dependency injection need to request resources to the container, this container does not come out on the above, we will explain how

Spring annotation injection: (context: component-scan) Spring versions 2.5 support annotation injection, which saves a lot of xml configuration work. Because annotations are written into java code, annotation injection will lose some flexibility. We need to choose whether to