SoFunction
Updated on 2025-04-09

Detailed explanation of Spring Boot configuration file example

This article will introduce Spring Boot in detailConfiguration file usage and configuration items. We'll discussThe basic concept of files and how to use it to configure aspects of Spring Boot applications. In addition, we will use specific examples to show how to configure different Spring Boot components, such as data sources, databases, caches, mail services, etc. This article is suitable for developers who want to have an in-depth understanding of Spring Boot configuration files.

1. Introduction

In Spring Boot app,Configuration files are important resources for configuring application properties. This file provides an easy way to configure various components of Spring Boot applications, such as data sources, databases, caches, mail services, etc. This article will introduce in detailConfiguration file usage and configuration items, and explore how to use it to configure different Spring Boot components.

2. Basic concepts of configuration files

1. What is a configuration file?

It is a configuration file in YAML (YAML Ain’t Markup Language) format, which is used to configure various properties of Spring Boot applications. YAML is an intuitive data serialization format that supports the representation of data structures, such as lists, maps, strings, integers, floating point numbers, etc.

2. Function of the document

  • Configure application properties:Files allow us to configure various properties of the application, such as server ports, database connections, cache policies, etc.
  • Simplified configuration management: by usingWe can centrally manage the application configuration information for easy maintenance and update.
  • Environmental Isolation:The file supports configurations of different environments, and we can create different configuration files for the development environment, test environment and production environment.

3. Use of configuration files

1. Create a file

In the Spring Boot application's resource directory (usuallysrc/main/resources), create a name calledfile. This file will contain the configuration properties of the application.

2. Configure the data source

existIn the file, we can configure the properties of the data source, such as database type, URL, username and password, etc. Here is an example of configuring a data source:

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test_db
    username: root
    password: root
    driver-class-name:

In the example above, we configured a MySQL data source, including the database URL, username, password, and driver class name.

3. Configure the database

In addition to the data source configuration, we can alsoConfigure the properties of the database in the file, such as database schema, tablespace, etc. Here is an example of configuring a database:

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test_db
    username: root
    password: root
    driver-class-name: 
  databases:
    test_db:
      schema: my_schema
      tablespace: my_tablespace

In the example above, wetest_dbThe database is configured with schema and tablespace.

4. Configure cache

existIn the file, we can configure cache attributes, such as cache type, expiration time, etc. Here is an example of configuring cache:

spring:
  cache:
    type: redis
    redis:
      host: localhost
      port: 6379
      password: ""
      jedis:
        pool:
          max-active: 10
          max-idle: 5
          min-idle: 1
          max-wait: -1ms

In the above example, we configured a Redis-based cache and set the cache type, host, port, password, connection pool and other properties.

5. Configure the mail service

existIn the file, we can configure the properties of the mail service, such as SMTP server, port, username and password, etc. Here is an example of configuring a mail service:

spring:
  mail:
    host: 
    port: 587
    username: your-email@
    password: your-password
    properties:
      mail:
        smtp:
          auth: true
          starttls: true
          ssl: false

In the above example, we configured an SMTP mail service, including host, port, username, password, and related attributes of the SMTP server.

6. Configure other components

In addition to data sources, databases, caches and mail services, we can alsoConfigure the properties of other Spring Boot components in the file, such as database templates, transaction managers, security, etc. Here are some configuration examples for some other components:

spring:
  template:
    engine:
      default: 'freemarker'
      freemarker:
        prefix: ''
        suffix: '.ftl'
        check-template: true
        config-location: classpath:template/
        encoding: UTF-8
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
    properties:
      hibernate:
        dialect: .MySQL5InnoDBDialect

In the example above, we configured the related properties of the template engine, JPA, and Hibernate.

4. Summary

This article introduces Spring Boot in detailConfiguration file usage and configuration items. We first understandThe basic concepts and functions of files, and then learn how to use it to configure different components of Spring Boot applications, such as data sources, databases, caches, mail services, etc.
Through this article, you should have mastered how to use itFile to configure Spring Boot application. You have learned how to configure the properties of data sources, databases, caches, mail services, and other components. Hope this article helps you to develop Spring Boot applications more easily. If you have any questions or suggestions, please feel free to leave a message to communicate.

This is the end of this article about the detailed explanation of Spring Boot configuration files. For more related Spring Boot configuration files, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!