@PropertySource

• 加载指定的配置文件
• 只能加载*.properties文件，不能加载yaml文件

新建一个user.properties

user.nickname=张三
user.age=19
user.sex=男
user.maps.weight=70
user.maps.height=170
user.address.addr=重庆市渝中区
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UserBean

@Component
@PropertySource(value = {"classpath:user.properties"})
@ConfigurationProperties(prefix = "user")
public class User {private String nickname;private Integer age;private char sex;private Map<String,Integer> maps;private Address address;...
}
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@ImportResource

• 导入Spring的配置文件，让配置文件里面的内容生效

SpringBoot中编写的Spring配置文件是不能自动识别的

在主配置类上加入@ImportResource

@ImportResource(locations = {"classpath:beans.xml"})
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SpringBoot给容器添加组件的方式

1、配置类 == Spring配置文件 通过@Configuration声明

2、使用@Bean给容器添加组件，组件id默认为方法名

例子

package com.atgenee.demo.service;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;@Configuration
public class Hello {@Beanpublic Hello helloService() {System.out.println("添加组件");return new Hello();}
}
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测试

package com.atgenee.demo;import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.ApplicationContext;
import org.springframework.test.context.junit4.SpringRunner;@RunWith(SpringRunner.class)
@SpringBootTest
public class HelloServiceApplicationTests {//   @Autowired
//  private Hello hello;
//
//  @Test
//  public void hello() {//      hello.helloService();
//  }@Autowiredprivate ApplicationContext ioc;@Testpublic void hello() {ioc.getBean("helloService");}
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请注意

若配置类已经加了@Bean注解，此时配置类中的方法名不能跟类名一样，也就是上面的Hello类中不能定义hello()的方法，否则报错

通过自定义工厂来实现自定义yaml文件加载

新建一个cat.yml文件

cat:
  age: 3
  height: 20
  weight: 5
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工厂类

package com.atgenee.demo.factory;import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;import org.springframework.beans.factory.config.YamlPropertiesFactoryBean;
import org.springframework.core.env.PropertiesPropertySource;
import org.springframework.core.env.PropertySource;
import org.springframework.core.io.support.EncodedResource;
import org.springframework.core.io.support.PropertySourceFactory;
import org.springframework.lang.Nullable;public class YamlPropertySourceFactory implements PropertySourceFactory {@Overridepublic PropertySource<?> createPropertySource(@Nullable String name, EncodedResource resource) throws IOException {Properties propertiesFromYaml = loadYamlIntoProperties(resource);String sourceName = name != null ? name : resource.getResource().getFilename();return new PropertiesPropertySource(sourceName, propertiesFromYaml);}private Properties loadYamlIntoProperties(EncodedResource resource) throws FileNotFoundException {try {YamlPropertiesFactoryBean factory = new YamlPropertiesFactoryBean();factory.setResources(resource.getResource());factory.afterPropertiesSet();return factory.getObject();} catch (IllegalStateException e) {// for ignoreResourceNotFoundThrowable cause = e.getCause();if (cause instanceof FileNotFoundException)throw (FileNotFoundException) e.getCause();throw e;}}
}
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新建配置类 Cat，配合@PropertySource 注解使用

package com.atgenee.demo.config;import com.atgenee.demo.factory.YamlPropertySourceFactory;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;@Component
@PropertySource(factory = YamlPropertySourceFactory.class, value = "classpath:cat.yml")
@ConfigurationProperties(prefix = "cat")
public class Cat {private int age;private Double weight;private Double height;public int getAge() {return age;}public void setAge(int age) {this.age = age;}public Double getWeight() {return weight;}public void setWeight(Double weight) {this.weight = weight;}public Double getHeight() {return height;}public void setHeight(Double height) {this.height = height;}@Overridepublic String toString() {return "Cat{" +"age=" + age +", weight=" + weight +", height=" + height +'}';}
}
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Cat测试类

package com.atgenee.demo;import com.atgenee.demo.config.Cat;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;@RunWith(SpringRunner.class)
@SpringBootTest
public class CatApplicationTests {@Autowiredprivate Cat cat;@Testpublic void hei() {System.out.println(cat);}}
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控制台输出

Cat{age=3, weight=5.0, height=20.0}
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