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Database operation pom.xml import module: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </de ...

To become a Spring bean, we usually add annotations @ Component, @ Controller, @ Service, @ Repository and other annotations on the class. And Spring from 4 Since the X version, Spring supports the Conditional annotation @ Conditional, and only the classes that meet the conditions can be registered as Spring beans. Therefore, before analyzing t ...

Spring supports injecting dependencies of single type and collection type. For a single type, if you inject by type, spring will throw a NoUniqueBeanDefinitionException when there are multiple beans of the same type in the container. In this case, we can choose to set a bean as primary. However, if there are multiple primary beans, spring will ...

In< What is the difference between @ Autowired and @ Resource in Spring? In this article, we mentioned that when Spring relies on injection, it first parses @Autowired annotations and @Resource annotated objects into dependency descriptor DependencyDescriptor, and then calls AutowireCapableBeanFactory#resolveDependency (DependencyDescriptor, ...

Spring MVC processes http requests through the handler mapping and handler adapter. When a request passes through the dispatcher servlet, the dispatcher servlet will select an appropriate handler mapping and handler adapter to process the request. By customizing the processor mapper and processor adapter, we can learn how spring MVC handles a ...

  spring cloud must be familiar to everyone. It provides developers with tools to quickly build some common patterns in distributed systems, such as configuration management, service discovery, circuit breaker and load balancing. As the saying goes, if you want to be good at something, you must first use your tools. Today, let's disassembl ...

1. Description I had a tentative interview with a company before. One of the questions was: have you ever written a SpringBoot custom starter Since I have read the source code of Spring before, is this still a problem? Although I haven't written it, I explained the principle again. Take the time to write a custom starter and an enhanced v ...

Undertake the above Practice of delay queue based on redis and redisson Today, we will introduce rabbitmq, a delay plug-in based on rabbitmq_delayed_message_exchange implements deferred tasks. 1, Usage scenarios for delayed tasks 1. The order was placed successfully and was not paid for 30 minutes. Payment timeout, automatic cancellation of ord ...

Spring MVC User Guide 1, How spring MVC works 1.1 principle and process of spring MVC Picture address: 22. Web MVC framework The user initiates a request and the request is intercepted into the dispatcher servlet (FrontController), which is the core of Spring,Handle the URL of the request with HandlerMapping and find the processor ...

Spring MVC User Guide 1, How spring MVC works 1.1 principle and process of spring MVC Picture address: 22. Web MVC framework The user initiates a request and the request is intercepted into the dispatcher servlet (FrontController), which is the core of Spring, Handle the URL of the request with HandlerMapping and find the processor Handler ...