SpringBoot配置

获取数据

application.yml

server:
  port: 8083

name: abc
#对象 参数引用
person:
  name: ${name} #引用上面的name值 #tiandao
  age: 20
  address:
    - shenzhen
    - hangzhou

#对象行内写法
person2: {name: tiandao,age: 20}

#数组
address:
  - shenzhen
  - hangzhou

#数组行内写法
address2: [shenzhen,hangzhou]

#纯量
msg1: 'hello \n world'  # 单引忽略转义字符(不会识别转义字符，回原样输出)
msg2: "hello \n world"  # 双引识别转义字符(会识别转义字符)

SpringbootInitApplication.class

package com.itheima.springbootinit;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringbootInitApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootInitApplication.class, args);
    }

}

@Value、@Autowired、@ConfigurationProperties属性注入方式

HelloController.class

package com.itheima.springbootinit;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.env.Environment;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    /**
     * value的属性注入方式
     * @Value
     */

    //    对象的属性注入
    @Value("${name}")
    private String name;

    @Value("${person.name}")
    private String name2;

    @Value("${person.age}")
    private int age;

    //    数组的属性注入
    @Value("${address[0]}")
    private String address1;

    //    纯量
    @Value("${msg1}")
    private String msg1;
    @Value("${msg2}")
    private String msg2;

    /**
     *对象的属性注入方式
     * 相较于@Value只需要一个对象，注入属性值便可
     * @Autowired
     */

    @Autowired
    private Environment env;

    /**
     *配置属性
     * @ConfigurationProperties
    */

    @Autowired
    private Person person;

    @RequestMapping("/hello2")
    public String hello2() {
        System.out.println(name);
        System.out.println(name2);
        System.out.println(age);
        System.out.println(address1);
        System.out.println(msg1);
        System.out.println(msg2);
        System.out.println("---------------------------");
        System.out.println(env.getProperty("person.name"));
        System.out.println(env.getProperty("address[0]"));
        return "Hello Spring Boot !";
        System.out.println("---------------------------");
        System.out.println(person);
        String[] address = person.getAddress();
        for (String s : address) {
            System.out.println(s);
        }
    }

    @RequestMapping("/hello")
    public String hello() {
        return "Hello Spring Boot !";
    }
}

person.java

package com.itheima.springbootinit;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
@Component //表示Person被ToString识别
@ConfigurationProperties(prefix = "person")
public class Person {

    private String name;
    private Integer age;
    private String[] address;
}

springboot-init pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.itheima</groupId>
    <artifactId>springboot-init</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-init</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.22</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

网址：http://localhost:8083/hello2

banner.txt:https://www.bootschool.net/ascii

profile

作用：进行动态配置切换
profile配置方式
application-dev.properties/yml 开发环境
application-test.properties/yml 测试环境
application-pro.properties/yml 生产环境

• 多profile文件方式

application-dev.properties/yml 开发环境

application.properties(激活)

spring.profiles.active=dev 

• yml多文档方式

在yml中使用 --- 分隔不同配置

application.yml

---

server:
  port: 8081

spring:
  config:
    activate:
      on-profile: dev

---

server:
  port: 8082

spring:
  config:
    activate:
      on-profile: test

---

server:
  port: 8083

spring:
  config:
    activate:
      on-profile: pro

---

spring:
  profiles:
    active: pro

profile激活方式

• 配置文件

spring:
  profiles:
    active: pro

• 虚拟机参数

VM options:

• 命令行参数

Program arguments:

项目内部配置加载顺序

SpringBoot程序启动时，会从以下位置加载配置文件：
1.file:./config/ :当前项目下的/config目录下
2.file:./ :当前项目的根目录
3.classpath:/config/:classpath的/config目录
4.classpath:/ :classpath的根目录
加载顺序为1234，高优先级配置的属性会生效（配置一次读取，相同配置使用最高优先级，其余忽略）

外部配置加载顺序

官网查看：http://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html
Externalized Configuration