详解Springboot 注入装配到IOC容器方式
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1、通过bean注解装配到IOC容器
创建装配的类，如下
package com.sboot.pr.bean;
public class BeanPOJO {
private int id;
private String name;
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;
}
}通过bean注解装配BeanPOJO到IOC容器
package com.sboot.pr.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.sboot.pr.bean.BeanPOJO;
@Configuration
public class BeanConfig {
@Bean(name = "beanPOJO")
public BeanPOJO initBeanPOJO() {
BeanPOJO pojo = new BeanPOJO();
pojo.setId(1);
pojo.setName("BeanPOJO");
pojo.setAge(29);
return pojo;
}
}把装配的BeanPOJO 注入
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;
@RestController
public class TestController {
@Autowired
private BeanPOJO beanPoJO;
@GetMapping("/boot/getBeanPOJO")
public BeanPOJO getBeanPOJO() {
return beanPoJO;
}
}访问注入的BeanPOJO信息
http://localhost:1111/boot/getBeanPOJO
2、通过Component注解扫描装配bean到IOC容器
创建装配的类，如下
package com.sboot.pr.bean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Component;
@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;
}
}把装配的ComponentPOJO 注入
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;
@RestController
public class TestController {
@Autowired
private ComponentPOJO componentPOJO;
@GetMapping("/boot/getComponentPOJO")
public ComponentPOJO getComponentPOJO() {
return componentPOJO;
}
}访问注入的ComponentPOJO 信息
http://localhost:1111/boot/getComponentPOJO
3、通过ComponentScan注解扫描装配bean到IOC容器
创建装配的类，如下
package com.sboot.pr.bean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@ComponentScan
public 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;
}
}把装配的ComponentScanPOJO 注入
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;
@RestController
public class TestController {
@Autowired
private ComponentScanPOJO componentScanPOJO;
@GetMapping("/boot/getComponentScanPOJO")
public ComponentScanPOJO getComponentScanPOJO() {
return componentScanPOJO;
}
}访问注入的ComponentScanPOJO信息
http://localhost:1111/boot/getComponentScanPOJO
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