Springboot中通过yml为实体类注⼊属性Springboot中通过yml为实体类注⼊属性
延伸：以后除了可以为实体类注⼊属性，还可以为配置类注⼊相关的配置信息
1.编写实体类
@Component
@ConfigurationProperties(prefix ="person")
public class Person {
private String lastName;
private Integer age;
private Boolean boss;
private Date birth;
private Map<String,Object> maps;
private List<Object> lists;
private Dog dog;
@Override
public 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){springboot中文
this.dog = dog;
}
}
@Component 表⽰将当前类的创建⼯作交给Spring容器管理
@ConfigurationProperties(prefix = “person”) ⽤于表⽰该类需要读取的配置信息，prefix⽤于指⽰读取哪⼀个配置信息Person类依赖了⼀个Dog类，如下：
public class Dog {
private String name;
private Integer age;
@Override
public 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;
}
}
2.编写yml⽂件
@ConfigurationProperties(prefix = “person”)，Person类的这个注解就会去yml中对应的配置信息
person:
lastName: zhangsan
age:18
boss:false
birth: 2017/12/12
maps:{k1: v1,k2: v2}
lists:
- lisi
- zhaoliu
- wangwu
dog:
name:⼩狗
age:2
3.测试
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootQuickStartApplicationTests {
@Autowired
Person person;
@Test
public void demo1(){
System.out.println(person);
}
}
4.结果
注意：有可能中⽂在这个地⽅打印会出现乱码，原因是yml的编码和java⽂件的编码不⼀样导致，我们需要将其配成⼀致的编码，如都设置成utf-8。
5.可以不⽤@ConfigurationProperties(prefix = “person”)注解 的⽅式，使⽤@Value的⽅式注⼊属性值
@Value注解等价于：
以三个属性字段为例，我们既可以从配置⽂件取值，也可以通过字⾯量直接赋值，当属性值少的时候这种⽅式特别⽅便。
@Value("${person.lastName}")
private String lastName;
@Value("${person.age}")
private Integer age;
@Value("true")
private Boolean boss;
效果如下，由于只注⼊了三个属性，其余属性则为空
6.@ConfigurationProperties(prefix = “person”)默认是从主配置⽂件中读取相关信息，我们可以使⽤
@PropertySource(value = {“配置⽂件的路径”})来指定需要读取的配置⽂件
6.1写⼀个dog.properties配置Dog类的相关配置信息
dog.name=puppy
dog.age=24
6.2为Dog类注⼊属性
@PropertySource(value ={"classpath:dog.properties"}) @Component
@ConfigurationProperties(prefix ="dog")
public class Dog {
private String name;
private Integer age;
6.3效果

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