First, the configuration file

SpringBoot use a global configuration file, the configuration file name is fixed;

• application.properties
• application.yml

Role configuration file: Modify the default value SpringBoot auto-configuration; (because he gave us in the bottom of the default SpringBoot automatically configured;)

YAML (YAML Is not Markup Language) YAML A Markup Language: is a markup language

YAML is not Markup Language: is not a markup language; markup languages:

Previous profile; mostly used xxxx.xml file;

YAML: data-centric than JSON, XML and other more suitable profile;

YAML: Configuration example

server:
    port: 8081

XML: Configuration example

<server>
    <port>8081</port>
</server>

Two, YAML syntax

2.1 , basic grammar

k :( space) v: designates a pair of key-value pairs (there must be a space);

If you need a space indentation hierarchy to control the hierarchy; as long as one is left-aligned data, are the same level

server:
    port: 8081
    path: /hello

And attribute values are case sensitive;

2.2 , the value of writing

Literal: Common values (numbers, strings, Boolean, date)

k: v: literally write directly;

No default string in single or double quotes;

Double quotes ; there will not escape the string of special characters; special characters as themselves wish of intention

name: "zhangsan \ n lisi": Output; zhangsan newline lisi ''

Single quotes ; will escape special characters, special characters finally just an ordinary string data

name: 'zhangsan \ n lisi': output; zhangsan \ n lisi

Object, Map (attributes and values) (key-value pairs):

k: v: the next line to write the relationship between attributes and values of an object; note indentation object or k: v way

friends:
    lastName:  zhangsan
    age: 20

Inline wording:

friends:  {lastName:  zhangsan,age:  18}

Array (List, Set):

Represents an element in the array values - with

pets:
    ‐ cat
    ‐ dog
    ‐ pig

Inline wording

pets: [cat,dog,pig]

Third, the value of the injected profile

Profile yml

person:
    lastName:  hello
    age: 18
    boss: false
    birth: 2017/12/12
    maps:  {k1:  v1,k2:  12}
    lists:
      - lysis
      - zhaoliu
    dog:
      name: Puppies
      age: 12

javaBean：

/**

* The value of the attribute of each configuration file is mapped to the component

* @ ConfigurationProperties: Tell SpringBoot all the attributes and configuration files in this class for the corresponding configuration bind

* Prefix = "person": profile in which all of the following attributes one mapping

* This component is only a container of components, @ConfigurationProperties to function provided by the container;

*

*/ @Component

@ConfigurationProperties(prefix  =  "person") 

public class Person {

 

　　private  String  lastName; 

　　private Integer age; 

　　private Boolean boss; 

　　private Date birth;

 

　　private  Map<String,Object>  maps; 

　　private  List<Object>  lists; 

　　private Dog dog;

We can import the configuration file processor, after writing configuration have prompted the

    <! - introducing profile processor, binding profile will be prompted - > < dependency > < the groupId > org.springframework.boot </ the groupId > < the artifactId > Spring-Configuration-Processor Boot- </ the artifactId > < optional > to true </ optional > </ dependency >

3.1, properties utf-8 default configuration file may be garbled in the idea of

Adjustment

3.2, @ Value acquisition value and acquisition value comparison @Con fi gurationProperties

	@ConﬁgurationProperties	@Value
Features	Batch injection configuration file attributes	A designated
Loosely bound (loose syntax)	stand by	not support
Game(#{})	not support	stand by
JSR303 data check	stand by	not support
Complex type package (such as Map)	stand by	not support

Profile yml or properties they can get to value;

If you say that we just need to get some business logic at a particular value in the configuration file, use @Value;

If we say that we wrote a javaBean dedicated to mapping and configuration files, we just use fi gurationProperties @Con; √

Injection profile data check value ( JSR303 Data Check )

@Component

@ConfigurationProperties(prefix  =  "person") @Validated

public class Person {



// lastName must be a mailbox format

@Email

//@Value("${person.last‐name}") private  String  lastName;

//@Value("#{11*2}") private Integer age;

//@Value("true") private Boolean boss;



/**

* <bean class="Person">

* <Property name = "lastName" value = "literal / $ {key}, the value profile acquired from the environment variable / # {SpEL}"> </ property>

* <bean/>

*/



private Date birth;

private  Map<String,Object>  maps; 

private  List<Object>  lists; 

private Dog dog;

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