Programmer Think

Chapter one: SpringBoot/Spring uses @ Value for attribute binding (podcast code for wisdom spreading)   The ConfigurationProperties annotation will read the properties from the global configuration file by default. When there are many properties, the main configuration file(application.yml, application.properties) will be bloated, so it is ne ...

Operation of Phoenix associated HBase (three cases) Situation 1: Hbase already has existing tables. You can create corresponding views in Phoenix. Views can only be queried, not added, deleted or modified Table has been created and data exists in hbase, table name: phoenix Create the corresponding view in phoenix create view "phoenix"( pk ...

1. The cause of circular dependency - injected through the constructor Let's define two interdependent bean s (injected through the constructor): @Component public class CircularDependencyA { private CircularDependencyB circB; @Autowired public CircularDependencyA(CircularDependencyB circ ...

SpringAop 2.x Introduction: The principle of namespace based configuration is to use post processor, which is simpler. Characteristic: Simplified configuration, There is no need to implement any interface when writing non intrusive notifications. Use the AspectJ expression to define the tangent point. B ...

1. Import Maven coordinates <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.0.2.RELEASE</version> </dependency> <de ...

1. What is FreeMarker FreeMarker is a template engine: a template based, used to generate output text (any text from HTML format is used to automatically generate the source Code). It is a development package or class library for Java programmers. FreeMarker's design is actually used to generate HTML ...

Article directory Environment creation and simple query, see the previous article 1Specifications dynamic query 1.1 query single object according to conditions 1.2 multi criteria query 1.3 fuzzy matching, sorting 1.4 paging query 2. Relationship between multiple tables and operation steps of multip ...

I wrote the IOC implementation of spring before, but now I write the implementation of DI dependency injection Paste class diagram Because junit package will be used when DI is implemented for testing, import dependency in pom.xml <!--SpringDI--> <dependency> &lt ...

Writing unit tests can help developers write high-quality code, improve code quality, reduce bugs, and facilitate refactoring.Spring Boot provides utilities and annotations to help us test applications. Opening unit tests in Spring Boot requires only the introduction of spring-boot-starter-test, which includes some of the mainstream test librar ...

Preface The problem encountered in the previous development process is that the time in the message body is 8 hours less than the current time when the rabbitmq template is used to send messages. This is the time zone problem. Let's talk about why it appears. The previous configuration is as follows: @Bean public RabbitTemplate rabbitTempl ...