Bootstrap

Spring-Boot框架的常用注解和属性绑定效果实现------Spring-Boot框架 

package com.example.boot3.Config;

import com.alibaba.druid.FastsqlException;
import com.example.boot3.bean.Pig;
import com.example.boot3.bean.Sheep;
import com.example.boot3.bean.User;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.Scope;

//主要用于导入第三方的需要组件化并配置属性的类
//因为默认SpringBoot只扫描自己bootApp所在的包及其子包,如果导入第三方包,即便标注了注解@Component@ConfigurationProperties等
//依旧无法导入组件并进行属性绑定
@EnableConfigurationProperties(Sheep.class)//开启后会自动把这个Sheep放到容器中,并开启sheep的属性绑定
@SpringBootConfiguration//这是一个SpringBoot配置类
//@Configuration//这是一个配置类
@ConditionalOnClass(name = "com.alibaba.druid.FastsqlException")//放在类级别就会使整个类具有条件注解的效果
//如果没有整个不生效
@Import(FastsqlException.class)//导入任意类作为组件,但是组件的名字默认是全类名!!!!!
public class AppConfig
{
//    组件默认是单实例的
    @Scope("prototype")
    @Bean//替代Bean标签
    public User user(){//默认的Bean名字就是方法名字
        var user = new User();
        user.setName("Jack");
        user.setId(1L);
        return user;
    }
    @Bean
    @ConfigurationProperties(prefix = "pig")//即能标注在类上也能标注在方法上
    public Pig pig(){
        return new Pig();
    }
//    导入第三方Bean
    @Bean
    public FastsqlException fastsqlException(){
        return new FastsqlException();
    }
}

package com.example.boot3.Config;

import com.alibaba.druid.FastsqlException;
import com.example.boot3.bean.Pig;
import com.example.boot3.bean.Sheep;
import com.example.boot3.bean.User;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.Scope;

//主要用于导入第三方的需要组件化并配置属性的类
//因为默认SpringBoot只扫描自己bootApp所在的包及其子包,如果导入第三方包,即便标注了注解@Component@ConfigurationProperties等
//依旧无法导入组件并进行属性绑定
@EnableConfigurationProperties(Sheep.class)//开启后会自动把这个Sheep放到容器中,并开启sheep的属性绑定
@SpringBootConfiguration//这是一个SpringBoot配置类
//@Configuration//这是一个配置类
@ConditionalOnClass(name = "com.alibaba.druid.FastsqlException")//放在类级别就会使整个类具有条件注解的效果
//如果没有整个不生效
@Import(FastsqlException.class)//导入任意类作为组件,但是组件的名字默认是全类名!!!!!
public class AppConfig
{
//    组件默认是单实例的
    @Scope("prototype")
    @Bean//替代Bean标签
    public User user(){//默认的Bean名字就是方法名字
        var user = new User();
        user.setName("Jack");
        user.setId(1L);
        return user;
    }
    @Bean
    @ConfigurationProperties(prefix = "pig")//即能标注在类上也能标注在方法上
    public Pig pig(){
        return new Pig();
    }
//    导入第三方Bean
    @Bean
    public FastsqlException fastsqlException(){
        return new FastsqlException();
    }
}

package com.example.boot3.bean;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

//@Component
//@ConfigurationProperties(prefix = "pig")//因为我们标注了这个注解
//因此会进行自动绑定
public class Pig
{
    private Long id;
    private String name;
    private Integer age;

    public Pig() {
    }

    @Override
    public String toString() {
        return "Pig{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Pig(Long id, String name, Integer age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
}

package com.example.boot3.bean;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

//@Component
//@ConfigurationProperties(prefix = "pig")//因为我们标注了这个注解
//因此会进行自动绑定
public class Pig
{
    private Long id;
    private String name;
    private Integer age;

    public Pig() {
    }

    @Override
    public String toString() {
        return "Pig{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Pig(Long id, String name, Integer age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
}

package com.example.boot3.bean;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@ConfigurationProperties(prefix = "sheep")
//@Component
public class Sheep {
    private Long id;
    private String name;
    private Integer age;

    public Sheep() {
    }

    public Sheep(Long id, String name, Integer age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    @Override
    public String toString() {
        return "Sheep{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

package com.example.boot3.bean;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@ConfigurationProperties(prefix = "sheep")
//@Component
public class Sheep {
    private Long id;
    private String name;
    private Integer age;

    public Sheep() {
    }

    public Sheep(Long id, String name, Integer age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    @Override
    public String toString() {
        return "Sheep{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

package com.example.boot3.Config;

import com.example.boot3.bean.Cat;
import com.example.boot3.bean.Dog;
import com.example.boot3.bean.User;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.context.annotation.Bean;

@SpringBootConfiguration
public class AppConfig2 {
    @Bean
    @ConditionalOnClass(name="com.alibaba.druid.FastsqlException")
    public Cat cat01(){
        return new Cat();
    }
    @Bean
    @ConditionalOnMissingClass(value="com.alibaba.druid.FastsqlException")
    public Dog dog01(){
        return new Dog();
    }
    @Bean
    @ConditionalOnBean(name = "dog01")
    public User zhangsan(){
        return new User();
    }
    @Bean
    @ConditionalOnMissingBean(name = "dog01")
    public User lisi(){
        return new User();
    }
}

package com.example.boot3.Config;

import com.example.boot3.bean.Cat;
import com.example.boot3.bean.Dog;
import com.example.boot3.bean.User;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.context.annotation.Bean;

@SpringBootConfiguration
public class AppConfig2 {
    @Bean
    @ConditionalOnClass(name="com.alibaba.druid.FastsqlException")
    public Cat cat01(){
        return new Cat();
    }
    @Bean
    @ConditionalOnMissingClass(value="com.alibaba.druid.FastsqlException")
    public Dog dog01(){
        return new Dog();
    }
    @Bean
    @ConditionalOnBean(name = "dog01")
    public User zhangsan(){
        return new User();
    }
    @Bean
    @ConditionalOnMissingBean(name = "dog01")
    public User lisi(){
        return new User();
    }
}

package com.example.boot3;

import com.example.boot3.bean.*;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@ComponentScan("com.example")//改变包扫描路径
@SpringBootApplication(scanBasePackages = "com.example.boot3")//手动指定扫描包位置
public class Boot3Application
{
    public static void main(String[] args) {
        var ioc = SpringApplication.run(Boot3Application.class, args);
//        for (String name : ioc.getBeanDefinitionNames()) {
//            System.out.println(name);
//        }
//        Object user = ioc.getBean("user");
//        Object user1 = ioc.getBean("user");
//        System.out.println(user == user1);
//        System.out.println(ioc.getBean("fastsqlException"));
        for (String s : ioc.getBeanNamesForType(Cat.class)) {
            System.out.println(s);
        }
        for (String s : ioc.getBeanNamesForType(Dog.class)) {
            System.out.println(s);
        }
        for (String s : ioc.getBeanNamesForType(User.class)) {
            System.out.println(s);
        }
        Object pig = ioc.getBean("pig");
        System.out.println(pig);
//        for (String s : ioc.getBeanNamesForType(Sheep.class)) {
//            System.out.println(s);
//        }
        Object sheep = ioc.getBean(Sheep.class);
        System.out.println(sheep);
    }
}

package com.example.boot3;

import com.example.boot3.bean.*;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@ComponentScan("com.example")//改变包扫描路径
@SpringBootApplication(scanBasePackages = "com.example.boot3")//手动指定扫描包位置
public class Boot3Application
{
    public static void main(String[] args) {
        var ioc = SpringApplication.run(Boot3Application.class, args);
//        for (String name : ioc.getBeanDefinitionNames()) {
//            System.out.println(name);
//        }
//        Object user = ioc.getBean("user");
//        Object user1 = ioc.getBean("user");
//        System.out.println(user == user1);
//        System.out.println(ioc.getBean("fastsqlException"));
        for (String s : ioc.getBeanNamesForType(Cat.class)) {
            System.out.println(s);
        }
        for (String s : ioc.getBeanNamesForType(Dog.class)) {
            System.out.println(s);
        }
        for (String s : ioc.getBeanNamesForType(User.class)) {
            System.out.println(s);
        }
        Object pig = ioc.getBean("pig");
        System.out.println(pig);
//        for (String s : ioc.getBeanNamesForType(Sheep.class)) {
//            System.out.println(s);
//        }
        Object sheep = ioc.getBean(Sheep.class);
        System.out.println(sheep);
    }
}

pig.id=1
pig.name=佩奇
pig.age=5
sheep.id=1
sheep.name=苏茜
sheep.age=5
dog.id=1
dog.name=丹妮
dog.age=5
horse.id=1
horse.name=佩德罗
horse.age=5
rabbit.id=1
rabbit.name=瑞贝卡
rabbit.age=5
pig.id=1
pig.name=佩奇
pig.age=5
sheep.id=1
sheep.name=苏茜
sheep.age=5
dog.id=1
dog.name=丹妮
dog.age=5
horse.id=1
horse.name=佩德罗
horse.age=5
rabbit.id=1
rabbit.name=瑞贝卡
rabbit.age=5

悦读

道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。

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