How to inject Springboot into IOC Container

This article mainly introduces how to inject Springboot into the IOC container, which has a certain reference value, and interested friends can refer to it. I hope you can learn a lot after reading this article.

1. Assemble to the IOC container through bean annotations

Create the assembled class, as follows

Package com.sboot.pr.bean;/** * @ author ygb * @ Mailbox 941201063@qq.com * @ date October 28, 2021 * assembled to IOC container * / public class BeanPOJO {private int id; private String name; private int age; public int getId () {return id via bean annotations } public void setId (int id) {this.id = id;} public String getName () {return name;} public void setName (String name) {this.name = name;} public int getAge () {return age } public void setAge (int age) {this.age = age;}}

Assemble BeanPOJO to IOC container via bean annotations

Package com.sboot.pr.config; import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration; import com.sboot.pr.bean.BeanPOJO / * @ author ygb * @ Mailbox 941201063@qq.com * @ date October 28, 2021 * configuration class file * / @ Configurationpublic class BeanConfig {/ * assemble BeanPOJO to the IOC container * @ return * / @ Bean (name = "beanPOJO") public BeanPOJO initBeanPOJO () {BeanPOJO pojo = new BeanPOJO () via bean annotations Pojo.setId (1); pojo.setName ("BeanPOJO"); pojo.setAge (29); return pojo;}}

Inject assembled BeanPOJO into

Package com.sboot.pr.controller; import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController; import com.sboot.pr.bean.BeanPOJO;import com.sboot.pr.bean.ComponentPOJO;import com.sboot.pr.bean.ComponentScanPOJO / * @ author ygb * @ Mailbox 941201063@qq.com * @ date October 28, 2021 * / @ RestControllerpublic class TestController {@ Autowired private BeanPOJO beanPoJO / * get the objects assembled to the IOC container through Bean annotations * @ return * / @ GetMapping ("/ boot/getBeanPOJO") public BeanPOJO getBeanPOJO () {return beanPoJO;}}

Access injected BeanPOJO information

Http://localhost:1111/boot/getBeanPOJO

2. Scan the assembly bean to the IOC container through Component annotations

Create the assembled class, as follows

Package com.sboot.pr.bean; import org.springframework.beans.factory.annotation.Value;import org.springframework.context.annotation.ComponentScan;import org.springframework.stereotype.Component / * @ author ygb * @ Mailbox 941201063@qq.com * @ date October 28, 2021 * injecting bean into the IOC container through Component annotation scan * specify the bean name, with the default initials lowercase * / @ Component ("componentPOJO") public class ComponentPOJO {@ Value ("2") private int id; @ Value ("ComponentPOJO") private String name @ Value ("29") private int age; public int getId () {return id;} public void setId (int id) {this.id = id;} public String getName () {return name } public void setName (String name) {this.name = name;} public int getAge () {return age;} public void setAge (int age) {this.age = age;}}

Inject assembled ComponentPOJO into

Package com.sboot.pr.controller; import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController; import com.sboot.pr.bean.BeanPOJO;import com.sboot.pr.bean.ComponentPOJO;import com.sboot.pr.bean.ComponentScanPOJO / * @ author ygb * @ Mailbox 941201063@qq.com * @ date October 28, 2021 * / @ RestControllerpublic class TestController {@ Autowired private ComponentPOJO componentPOJO / * get the objects assembled to the IOC container through Component annotations * @ return * / @ GetMapping ("/ boot/getComponentPOJO") public ComponentPOJO getComponentPOJO () {return componentPOJO;}}

Access injected ComponentPOJO information

Http://localhost:1111/boot/getComponentPOJO

3. Scan the assembly bean to the IOC container through ComponentScan annotations

Create the assembled class, as follows

Package com.sboot.pr.bean; import org.springframework.beans.factory.annotation.Value;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration / * @ author ygb * @ Mailbox 941201063@qq.com * @ date October 28th, 2021 * injecting bean into the IOC container through ComponentScan annotation scanning * you can specify policy columns, such as which packets need to be scanned and which bean are excluded * / @ Configuration@ComponentScanpublic class ComponentScanPOJO {@ Value ("3") private int id; @ Value ("ComponentScanPOJO") private String name @ Value ("29") private int age; public int getId () {return id;} public void setId (int id) {this.id = id;} public String getName () {return name } public void setName (String name) {this.name = name;} public int getAge () {return age;} public void setAge (int age) {this.age = age;}}

Inject assembled ComponentScanPOJO into

Package com.sboot.pr.controller; import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController; import com.sboot.pr.bean.BeanPOJO;import com.sboot.pr.bean.ComponentPOJO;import com.sboot.pr.bean.ComponentScanPOJO / * @ author ygb * @ Mailbox 941201063@qq.com * @ date October 28, 2021 * / @ RestControllerpublic class TestController {@ Autowired private ComponentScanPOJO componentScanPOJO / * get the objects assembled to the IOC container through Component annotations * @ return * / @ GetMapping ("/ boot/getComponentScanPOJO") public ComponentScanPOJO getComponentScanPOJO () {return componentScanPOJO;}}

Access injected ComponentScanPOJO information

Http://localhost:1111/boot/getComponentScanPOJO

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