SpringBoot主程序运行及配置文件

主程序运行

@SpringBootApplication
public class SpringbootApplication {

    public static void main(String[] args) {

        SpringApplication.run(SpringbootApplication.class, args);
    }

}

• 推断应用的类型是普通项目还是web项目
• 找并加载所有可用初始化器，设置到initializers属性中
• 找出所有的应用的应用程序监听器，设置到listeners属性中
• 推断并设置main方法的定义类，找到运行的主类

配置文件

springBoot使用一个全局的配置文件，配置文件的名称是固定的

• application.propertoes

  语法结构：key=value

例如：server.port=8080

• application.yml

  语法结构：key:空格 value

 server:
port: 8080

配置文件的作用：修改SpringBoot自动装配的默认值，因为SpringBoot在底层都给我们配置好了

yml可以直接给实体类赋值,如下所示

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class Dog {

    private String name;
    private Integer age;

    public Dog() {
    }

    public Dog(String name, Integer age) {
        this.name = name;
        this.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;
    }

    @Override
    public String toString() {
        return "Dog{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

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 {
    private String name;
    private Integer age;
    private Boolean student;
    private Date birth;
    private Map<String,Object> maps;
    private List<String> list;
    private 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 getStudent() {
        return student;
    }

    public void setStudent(Boolean student) {
        this.student = student;
    }

    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<String> getList() {
        return list;
    }

    public void setList(List<String> list) {
        this.list = list;
    }

    public Dog getDog() {
        return dog;
    }

    public void setDog(Dog dog) {
        this.dog = dog;
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", student=" + student +
                ", bitch=" + birth +
                ", maps=" + maps +
                ", list=" + list +
                ", dog=" + dog +
                '}';
    }
}

application.yml中：

#对象
person:
  name: 李
  age: 20
  student: false
  birth: 1998/1/1
  maps: {k1: v1,k2: v2}
  list:
    - code
    - music
  dog:
    name: 汪汪汪
    age: 1

//程序的主入口
@SpringBootTest
class SpringbootApplicationTests {

    @Autowired
    private Person person;

    @Test
    void contextLoads() {
        System.out.println(person);
    }

}

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