This guide will introduce you to YAML and the YAML support with the various application configuration options that are present in Spring Boot.
You will learn
- What is application configuration?
- What is YAML?
- What are the advantages of YAML?
- How do you specify application configuration using YAML with Spring Boot?
What is YAML?
YAML is a human readable serialization language
YAML stands for Yet Another Markup Language
Let’s consider an example
application.properties
level1.property1 = 5
level1.property2 = 6
level1.property3 = 7
level1.level2.property4 = 8
level1.level2.property5 = 10
level1.level2.property6 = 11
Above property file is cool but it is not very readable.
Let’s consider the same example in YAML format: application.yaml
level1:
property1: 5
property2: 6
property3: 7
level2:
property4: 8
property5: 10
property6: 11
YAML
- is concise
- is more readable
Spring Boot and YAML
Spring Boot has excellent support for YAML configuration.
Example 1
application.properties
server.port = 9080
application.yaml
server:
port: 9080
Example 2
application.properties
app.name=in28Minutes
app.description=${app.name} is your first Spring Boot application
welcome.message=Welcome message from property file! Welcome to ${app.name}
application.yaml
app:
name: In28Minutes
description: ${app.name} is your first Spring Boot application
welcome:
message: Welcome to your first Spring Boot app!
Example 3 - Dynamic Configuration
application.properties
basic.value: true
basic.message: Dynamic Message
basic.number: 100
application.yaml
basic:
value: true
message: Dynamic Message YAML
number: 100
Complete project with code example - https://github.com/in28minutes/spring-boot-examples/tree/master/spring-boot-tutorial-basics-configuration
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