@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
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;
...
}
@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"})
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 {
@Bean
public Hello helloService() {
System.out.println("添加组件");
return new Hello();
}
}
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();
// }
@Autowired
private ApplicationContext ioc;
@Test
public void hello() {
ioc.getBean("helloService");
}
}
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
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 {
@Override
public 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 ignoreResourceNotFound
Throwable cause = e.getCause();
if (cause instanceof FileNotFoundException)
throw (FileNotFoundException) e.getCause();
throw e;
}
}
}
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;
}
@Override
public String toString() {
return "Cat{" +
"age=" + age +
", weight=" + weight +
", height=" + height +
'}';
}
}
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 {
@Autowired
private Cat cat;
@Test
public void hei() {
System.out.println(cat);
}
}
控制台输出
Cat{age=3, weight=5.0, height=20.0}
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