史上最全面的Spring Boot配置文件深入讲解

name=zhangsan

name: "zhangsan \n lisi"

name: ‘zhangsan \n lisi'

Map<String,String> maps;

person.maps: {key1: value1,key2: value2}

person:
 maps:
 key: value

person.maps.key=value

person:
 list:
 - 1
 - 2
 - 3

person:
 list: [1,2,3]

person.list[0]=1
person.list[1]=2
person.list[2]=3

@Component // 或者@Configuration
@ConfigurationProperties(prefix = "person")
public class Person {
 private Map<String,String> maps;
 private List<String> list;
 private String name;

 public Map<String, String> getMaps() {
 return maps;
 }

 public void setMaps(Map<String, String> maps) {
 this.maps = maps;
 }

 public List<String> getList() {
 return list;
 }

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

 public void setName(String name) {
 this.name = name;
 }
}

<!--导入配置文件处理器，配置文件进行绑定就会有提示-->
<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-configuration-processor</artifactId>
 <optional>true</optional>
</dependency>

@Validated
@Configuration
@ConfigurationProperties(prefix = "person")
public class Person {
 @Email
 private String mail;

 public String getMail() {
 return mail;
 }

 public void setMail(String mail) {
 this.mail = mail;
 }
}

person.mail=yster@foxmail.com

@Configuration
@ConfigurationProperties(prefix = "person")
@PropertySource(value = "classpath:person.properties")
public class Person {
 private String mail;
 
 public String getMail() {
 return mail;
 }

 public void setMail(String mail) {
 this.mail = mail;
 }
}

${random.value}
${random.int}
${random.long}
${random.int(10)}
${random.int[1024,65536]}

person.last-name=张三${random.uuid}
person.age=${random.int}
person.birth=2017/12/15
person.boss=false
person.maps.k1=v1
person.maps.k2=14
person.lists=a,b,c
person.dog.name=${person.hello:hello}_dog
person.dog.age=15

server:
 port: 8081
spring:
 profiles:
 active: prod #指定使用哪个环境

---
server:
 port: 8083
spring:
 profiles: dev #指定属于哪个环境


---

server:
 port: 8084
spring:
 profiles: prod #指定属于哪个环境

java -jar spring-boot-02-config-0.0.1-SNAPSHOT.jar --spring.profiles.active=dev

-Dspring.profiles.active=dev

java -jar spring-boot-demo-0.0.1-SNAPSHOT.jar --spring.config.location=G:/application.properties

java -jar spring-boot-02-config-02-0.0.1-SNAPSHOT.jar --server.port=8087 --server.context-path=/abc

# Auto Configure
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\
......

@Configuration //表示这是一个配置类，以前编写的配置文件一样，也可以给容器中添加组件
@EnableConfigurationProperties(HttpEncodingProperties.class) //启动指定类的ConfigurationProperties功能；将配置文件中对应的值和HttpEncodingProperties绑定起来；并把HttpEncodingProperties加入到ioc容器中

@ConditionalOnWebApplication 
//Spring底层@Conditional注解（Spring注解版），根据不同的条件，如果满足指定的条件，整个配置类里面的配置就会生效；判断当前应用是否是web应用，如果是，当前配置类生效

@ConditionalOnClass(CharacterEncodingFilter.class) 
//判断当前项目有没有这个类CharacterEncodingFilter；SpringMVC中进行乱码解决的过滤器；

@ConditionalOnProperty(prefix = "spring.http.encoding", value = "enabled", matchIfMissing = true) 
//判断配置文件中是否存在某个配置 spring.http.encoding.enabled；如果不存在，判断也是成立的
//即使我们配置文件中不配置pring.http.encoding.enabled=true，也是默认生效的；
public class HttpEncodingAutoConfiguration {
 
 //他已经和SpringBoot的配置文件映射了
 private final HttpEncodingProperties properties;
 
 //只有一个有参构造器的情况下，参数的值就会从容器中拿
 public HttpEncodingAutoConfiguration(HttpEncodingProperties properties) {
 this.properties = properties;
 }
 
 @Bean //给容器中添加一个组件，这个组件的某些值需要从properties中获取
 @ConditionalOnMissingBean(CharacterEncodingFilter.class) //判断容器没有这个组件
 public CharacterEncodingFilter characterEncodingFilter() {
 CharacterEncodingFilter filter = new OrderedCharacterEncodingFilter();
 filter.setEncoding(this.properties.getCharset().name());
 filter.setForceRequestEncoding(this.properties.shouldForce(Type.REQUEST));
 filter.setForceResponseEncoding(this.properties.shouldForce(Type.RESPONSE));
 return filter;
 }

@ConfigurationProperties(prefix = "spring.http.encoding") //从配置文件中获取指定的值和bean的属性进行绑定
public class HttpEncodingProperties {

 public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

============================
CONDITIONS EVALUATION REPORT
============================


Positive matches:（自动配置类启用的）
-----------------

 CodecsAutoConfiguration matched:
 - @ConditionalOnClass found required class 'org.springframework.http.codec.CodecConfigurer'; @ConditionalOnMissingClass did not find unwanted class (OnClassCondition)

 CodecsAutoConfiguration.JacksonCodecConfiguration matched:
 - @ConditionalOnClass found required class 'com.fasterxml.jackson.databind.ObjectMapper'; @ConditionalOnMissingClass did not find unwanted class (OnClassCondition)
.......
Negative matches:（没有启动，没有匹配成功的自动配置类）
-----------------

 ActiveMQAutoConfiguration:
 Did not match:
  - @ConditionalOnClass did not find required classes 'javax.jms.ConnectionFactory', 'org.apache.activemq.ActiveMQConnectionFactory' (OnClassCondition)

 AopAutoConfiguration:
 Did not match:
  - @ConditionalOnClass did not find required classes 'org.aspectj.lang.annotation.Aspect', 'org.aspectj.lang.reflect.Advice', 'org.aspectj.weaver.AnnotatedElement' (OnClassCondition)