目錄

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理論

例子

解決properties文件編碼

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理論

@ConfigurationProperties注解是把Person加入到容器中，

<bean>標簽也是加入到容器中：

<bean class="Person"><property name="lastName" vale="字面量/${key}從環境變量、配置文件中獲取值/#{spEL}"></property> <bean/>

@Value和@ConfigurationProperties為屬性注入值對比

?	@ConfigurationProperties	@Value
功能	批量注入配置文件中的屬性	一一指定
松散綁定（松散語法）	支持	不支持
SpEL	不支持	支持
JSR303數據校驗	支持	不支持
復雜類型封裝	支持	不支持

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配置文件yml還是properties他們都能獲取得到值；

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@ConfigurationProperties

與@Bean結合為屬性的賦值

與@PropertySource(只能用于properties文件)結合讀取指定文件

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屬性名匹配規則（Relaxed binding)

標準寫法：person.firstName

大寫用-：person.first-name

大寫用_：person.first_name

推薦屬性：PERSON_FIRST_NAME

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例子

項目結構如下：

源碼如下：

Dog.java

package com.peoperties.peoperties.bean;public class Dog {private String name;private Integer age;@Overridepublic String toString() {return "Dog{" +"name='" + name + '\'' +", age=" + age +'}';}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;} }

Person.java?

package com.peoperties.peoperties.bean;import org.springframework.beans.factory.annotation.Value; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.stereotype.Component;import java.util.Date; import java.util.List; import java.util.Map;@Component @ConfigurationProperties(prefix = "person") public class Person {//@Value("${person.last-name}")private String lastName;//@Value("#{11*2}")private Integer age;//@Value("true")private Boolean boss;private Date birth;private Map<String, Object> maps;private List<Object> lists;private Dog dog;@Overridepublic String toString() {return "Person{" +"lastName='" + lastName + '\'' +", age=" + age +", boss=" + boss +", birth=" + birth +", maps=" + maps +", lists=" + lists +", dog=" + dog +'}';}public String getLastName() {return lastName;}public void setLastName(String lastName) {this.lastName = lastName;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public Boolean getBoss() {return boss;}public void setBoss(Boolean boss) {this.boss = boss;}public Date getBirth() {return birth;}public void setBirth(Date birth) {this.birth = birth;}public Map<String, Object> getMaps() {return maps;}public void setMaps(Map<String, Object> maps) {this.maps = maps;}public List<Object> getLists() {return lists;}public void setLists(List<Object> lists) {this.lists = lists;}public Dog getDog() {return dog;}public void setDog(Dog dog) {this.dog = dog;} }

PeopertiesApplication.java

package com.peoperties.peoperties;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication public class PeopertiesApplication {public static void main(String[] args) {SpringApplication.run(PeopertiesApplication.class, args);}}

application.properties

server.port=8081#配置person的值 person.last-name=李四 person.age=18 person.birth=2019/3/4 person.boss=false person.maps.k1=v1 person.maps.k2=19 person.lists=a,b,c,d,e,f,g,h person.dog.name=小白 person.dog.age=15

PeopertiesApplicationTests.java

package com.peoperties.peoperties;import com.peoperties.peoperties.bean.Person; 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 PeopertiesApplicationTests {@AutowiredPerson person;@Testpublic void contextLoads() {System.out.println(person);}}

運行截圖如下：

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解決properties文件編碼

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