230115_50_SpringBoot入门
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如果类中属性比较多,通过@value赋值比较麻烦。可以通过yaml配置文件给实例赋值。
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新建Person类,通过@ConfigurationProperties注解可以实现配置文件注入,其中prefix可以指定注入哪个配置。
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@ConfigurationProperties作用: 将配置文件中配置的每一个属性的值,映射到这个组件中; 告诉SpringBoot将本类中的所有属性和配置文件中相关的配置进行绑定 参数 prefix = “person” : 将配置文件中的person下面的所有属性一一对应
package com.bill;
import com.bill.Dog;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.Date;
import java.util.List;
import java.util.Map;
/**
* @Auther: wangchunwen
* @Date: 2023/1/14 - 01 - 14 - 21:10
* @Description: com.bill.controller
* @version: 1.0
*/
@Component
@ConfigurationProperties(prefix = "person")
public class Person {
private String name;
private Integer age;
private Boolean happy;
private Date birth;
private Map<String,Object> maps;
private List<Object> lists;
private Dog dog;
public Person(){
}
public Person(String name, Integer age, Boolean happy, Date birth, Map<String, Object> maps, List<Object> lists, Dog dog) {
this.name = name;
this.age = age;
this.happy = happy;
this.birth = birth;
this.maps = maps;
this.lists = lists;
this.dog = dog;
}
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 Boolean getHappy() {
return happy;
}
public void setHappy(Boolean happy) {
this.happy = happy;
}
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;
}
@Override
public String toString() {
return "Person{" +
"name='" + name + '\'' +
", age=" + age +
", happy=" + happy +
", birth=" + birth +
", maps=" + maps +
", lists=" + lists +
", dog=" + dog +
'}';
}
}
- person实体类对应的配置类
person:
name: bill
age: 4
happy: true
birth: 2023/01/15
maps: {k1: v1,k2: v2}
lists:
- cat
- dog
- fish
dog:
name: jack
age: 2
- 测试类
package com.bill;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class SpringbootApplicationTests {
@Autowired
private Person person;
@Test
void contextLoads() {
System.out.println(person);
}
}
测试结果: