Java Spring boot uses spring reflection and bootspring
Spring reflection
1. You can instantiate this class by class name.
ApplicationContext. getBean (name)2. Get classes by type
applicationContext.getBeansOfType(clazz);
First, you must obtain the spring container. The Appli
-initialize a new project using Spring Initializr (start.spring.io) usage:spring init [options] [location] O Ption Description------------------A,--artifactid Project coordinates; Infer Archive name (for example ' test ')-B,--boot-version Spring boot version (for
exception information logging and query.Connection pooling monitoring: monitor the status of the current system database connection pool to analyze SQL to identify system performance bottlenecks.Source source technical support for complete projects 17917433806. Source code Structure7. Registration Center8. Some functionsYou are welcome to study the relevant technology to understand the framework of technology or source of friends directly to seekSour
); beanDefinition.setSynthetic(true); registry.registerBeanDefinition(BEAN_NAME, beanDefinition); } } }
B. Add @ Import to the configuration class to introduce the above class.
@Import(MyImportBeanDefinitionRegistrar.class) public class TestConfig{ }
C. After this operation, you can use spring to obtain the bean.
The above is a simple example of Spr
theme.Two create a application in your OpenShift DIY environmentrhc app create This command creates an applicationBootusingDIYcartridge and clones the repository toBootdirectory.And then, for example, the database. These operations, you can be in the Web console after the addition is very convenient, not necessarily you need to join in RHC immediately, if necessaryrhc cartridge add Now go to your applicati
specified by the Spring.profiles.active property is added after those configured files through the Springapplication API, so the priority is higher.
If you specify any files in the spring.config.location, the specific profile version of those files will not be considered. If you also want to use a specific profile attribute, use the table of contents in Spring.config.location. 24.5 placeholders in Properties
When the values in Application.properties are used, they are filtered through the exist
Use Spring Boot to configure dynamic data sources to access multiple databases.
I wrote a blog titled Spring + Mybatis + Mysql to build a distributed database access framework. It describes how to configure dynamic data sources through Spring + Mybatis to access multiple dat
configuration. about paging Plug-ins and general Mapper integration
The paging plugin as an example of Plug-ins is available in the above code.
The General mapper configuration is the actual configuration of the mapperscannerconfigurer when the use of Tk.mybatis.spring.mapper.MapperScannerConfigurer can be configured to use properties. the Spring boot integrated
following instruction to output the corresponding version to verify the installation success, the code is as follows:Successful output will appear in the console:Spring Boot CLI Hello World caseAfter installation, it is convenient to learn to use it under the Spring Boot CLI. For example, we learn how to write an
-annotations are grouped together so that we can simply write an annotation to represent two annotations.Example:(1) Example combination annotations Packagecom.ecworking.annotation;ImportOrg.springframework.context.annotation.ComponentScan;Importorg.springframework.context.annotation.Configuration;Importjava.lang.annotation.*; @Target (Elementtype.type) @Retention (retentionpolicy.runtime) @Documented @configuration//combining @configuration meta-anno
-annotation" > @RequestMapping ( "/") public String greeting () { return " Hello world! "; } public static void main (string[] args) {} /span> Run app: mvn spring-boot:run or run Main () method in the IDE, Access http://localhost:8080 in the browser, Hello world! appears on the page. With just more than 10 lines of Java code and a Hello World app running correctly, what exactly does this code do? We are from the entr
Baselineonmigrate totrueTo initialize the metadata table. At org.flywaydb.core.flyway$1.execute (flyway.java:1035) at org.flywaydb.core.flyway$1.execute (flyway.java:1006) at Org.flywaydb.core.Flyway.execute (Flyway.java:1418) at Org.flywaydb.core.Flyway.migrate (Flyway.java:1006) at Org.springframework.boot.autoconfigure.flyway.FlywayMigrationInitializer.afterPropertiesSet ( Flywaymigrationinitializer.java:66) at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invo
exception information logging and query.Connection pooling monitoring: monitor the status of the current system database connection pool to analyze SQL to identify system performance bottlenecks.Source source technical support for complete projects 17917433806. Source code Structure6. Registration CenterYou are welcome to study the relevant technology to understand the framework of technology or source of friends directly to seekSource source technic
Spring Boot application development started, springboot Application DevelopmentCreate a Spring Boot Application
Spring Boot supports multiple integration methods, such as CLI, Maven, and Gradle. Here, Mavan is used as an
Listservice= Context.getbean (Listservice.class); System.out.println (Context.getenvironment (). GetProperty ("Os.name") + "List command under System is:" +listservice.showlistcmd ()); }}Operation Result:Only the Windows and Linux instances in the book were used for the first run, and the results were run listservice listservice = Context.getbean (Listservice.class); The times is wrong because there are no eligible instances created because I used a Mac that used to think that Mac was a Linux s
What's hot swapping in spring boot?
Reloading the changes without restarting the server is called hot swapping, modern IDEs (Eclipse, Idea, etc.) Hot swapping of bytecode, so if you do a change that doesn ' t affect class or method signatures it should Reloa D cleanly with no side effects.Not affect class or method signatures, give me a concrete example.
and is also a configuration that is officially recommended by spring boot. In this new yml file, we add the following code
Spring:
DataSource:
url:jdbc:mysql://190.0.1.88:3306/hello_test?useunicode=true
username:root
Password:root
driver-class-name:com.mysql.jdbc.driver
mybatis:
mapper-locations:
-classpath: Com/
, throw MyException exception[Java] View plain copy@Controllerpublic class Hellocontroller {@RequestMapping("/json") public String json() throws MyException { throw new MyException("发生错误2"); } }Create a corresponding processing for a myexception exception[Java] View plain copy@ControllerAdvicepublic class Globalexceptionhandler {@ExceptionHandler(value = MyException.class) @ResponseBody public ErrorInfo}Launch app, Access: Http://localhost:8080/json, you can get the following return co
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