1、yaml基本语法
2、支持的三种数据结构
3、springboot默认有两种配置springboot配置的方式,一种就application.properties,另一种就是application.yml
server:
port: 8080
person:
username: zhangsan
age: 18
email: zhangsan@qq.com
maps: {k1: v1,k2: 12}
lists:
- lis1
- lis2
- lis3
dog:
name: 小黄
age: 2
4、在application.properties同级目录下新建application.yml,在com.gong,springboot下新建bean包,在其下新建Person.java,Dog.java
Person.java
package com.gong.springboot.bean;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.List;
import java.util.Map;
//将配置文件中的属性映射到组件中
//prefix:表示配置文件中的哪个下面的属性进行一一映射
@Component
@ConfigurationProperties(prefix="person")
public class Person {
private String username;
private Integer age;
private String email;
private Map<String,Object> maps;
private List<Object> lists;
private Dog dog;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
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{" +
"username='" + username + '\'' +
", age=" + age +
", email='" + email + '\'' +
", maps=" + maps +
", lists=" + lists +
", dog=" + dog +
'}';
}
}
Dog.java
package com.gong.springboot.bean;
public class Dog {
private String name;
private Integer 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;
}
@Override
public String toString() {
return "Dog{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
}
注意:idea中自动提示getters和setters等方法使用快捷键alt+insert。
同时会看到:
需要将以下加入到pom.xml的dependencies中
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
5、进行测试
在test/java/com.gong,springboot/Myspringboot2ApplicationTests.java进行测试,这里需要注意,创建项目时自动生成的该文件好像不太对,太坑了,换成我们自己的:
package com.gong.springboot;
import com.gong.springboot.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 Myspringboot2ApplicationTests {
@Autowired
Person person;
@Test
public void contextLoads() {
System.out.println(person);
}
}
如果相关的报错,则alt+enter选择导入maven 依赖或者import 相关包即可。我们使用的是org.junit.Test,要在pom.xml中加入
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
最后我们运行该测试方法:在控制台可以看到输出
Person{username='zhangsan', age=18, email='zhangsan@qq.com', maps={k1=v1, k2=12}, lists=[lis1, lis2, lis3], dog=Dog{name='小黄', age=2}}