Springboot Configuration: Yaml Introduction

I. Introduction of YML

1. Spring boot uses a global configuration file (the name of the configuration file is fixed)

(1) application.properties

(2) Application.yml

2, the configuration file is placed in the Src/main/resources directory or the classpath/config

3, Yml is Yaml (yaml Ain ' t Markup lanaguage) language files, data-centric , more suitable for configuration files than Josn,xml. http://http:www.yaml.org reference Syntax specification.

Second, YAML syntax:

1. Basic syntax:

K: (Space) V: Indicates a pair of key-value pairs ( spaces must have )

Controls the hierarchical relationship with the indentation of a space, as long as the right-aligned column of data is a hierarchical

Properties and values are also case-sensitive.

Server:   8081   Path:/hello

2, the value of the wording

(1) Normal value (number, String, Boolean)

K:v: literally to write directly.

Strings are not added by default to single or double quotation marks;

　　If you use double quotation marks : There are special characters in the string, special characters are not recognized and are not escaped.

For example:

Name: "Zhangsan \ Lisi" output: Zhangsan newline Lisi

　　If single quotation marks are used , special characters are converted to normal character output.

Output: Zhangsan \ Lisi

(2) Map

K:v: Write the relationship of attributes and values in the next line, note the indentation

Object or the K:v way

friends:    lastname:zhangsan    

In-line notation:

(}

Array (List, Set):

　　A value that represents an element in the array:

Pets:     - cat    - dog    -Pig

In-line notation:

Pets: [Cat,dog,pig]

Example:

Bean file

　　

Package Com.song.bean;import Org.springframework.boot.context.properties.configurationproperties;import Org.springframework.stereotype.component;import java.util.date;import java.util.list;import Java.util.Map;/**j each attribute value in the configuration file is mapped to this array, *configurationproperties tells spring boot to bind all properties and configuration files in this class to the associated configuration * prefix = "person" : One by one mappings for all properties under that configuration file * Only this component is a component in the container to use the functionality provided by the container * Created by Administrator on 2018/6/12 0012. */@Component @configurationproperties (prefix=" Person") Public classPerson {PrivateString LastName; PrivateInteger age; PrivateBoolean Boos; PrivateDate Birth; PrivateMap<string,object>maps; PrivateList<object>lists; PrivateDog Dog; @Override PublicString toString () {return "person{"+"lastname= '"+ LastName +'\ ''+", age="+ Age +", boos="+ Boos +", Birth="+ Birth +", maps="+ Maps +", lists="+ Lists +", dog="+ Dog +'}'; }     PublicString Getlastname () {returnLastName; }     Public voidsetlastname (String lastName) { This. LastName =LastName; }     PublicInteger getage () {returnAge ; }     Public voidsetage (Integer age) { This. Age =Age ; }     PublicBoolean Getboos () {returnBoos; }     Public voidSetboos (Boolean boos) { This. Boos =Boos; }     PublicDate Getbirth () {returnbirth; }     Public voidSetbirth (Date birth) { This. Birth =birth; }     PublicMap<string, object>getmaps () {returnmaps; }     Public voidSetmaps (map<string, object>maps) {         This. maps =maps; }     PublicList<object>getlists () {returnlists; }     Public voidSetlists (list<object>lists) {         This. Lists =lists; }     PublicDog Getdog () {returnDog; }     Public voidSetdog (dog dog) { This. Dog =Dog; }}

Yaml file

Person:   Lastname:zhangsan   age:18   boss:true   BIRTH:2017/12/12   maps: {name: Floret, age:2}   lists :     -Lisi     -Zhaoliu   Dog:    name: Floret    age:2

Dependency configuration for Pom.xml

<!--Import the profile processor, the configuration file is bound with a hint-
<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-configuration-processor</artifactId>
   <optional>true</optional>
</dependency>

The final test prints the result as:

Person{lastname= ' Zhangsan ', age=18, Boos=null, Birth=tue Dec 00:00:00 gmt+08:00, maps={name= floret, age=2}, Lists=[li Si, Zhaoliu], dog=dog{name= ' Floret ', age=2}}

　　

The corresponding properties file configuration

Person.lastname=zhangsanperson.age=28person.maps.k1=xiahuaperson.maps.k2=lisiperson.dog.name=xiaohua Person.dog.age=2person.lists=a,b,c

Springboot Configuration: Yaml Introduction