Detailed introduction to SpringBoot2 configuration (code example)

This article brings you a detailed introduction (code example) about SpringBoot2 configuration. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

1.Properties and Yaml

SpringBoot supports two configuration files, properties and yaml application.properties/application.yml

Yaml is simple to use

1.Introduction to yaml

yaml is data-centric and is more suitable for configuration files than json and xml

2.yaml basic syntax

k: v: A key-value pair in the form, : must be followed by a space
Use spaces to indent to control hierarchical relationships
Case sensitive

Example:

server:
  port: 8081 # 设置默认端口号
  servlet:
    path: /init

How to write the value

k: v Write directly

[No single or double quotes are required for strings by default]

"": double quotes; special characters in the string will not be escaped;

'': Single quotes; special characters will be escaped, and the special characters will end up being just ordinary string data

Object

k: v: Write the object on the next line The relationship between attributes and values ​​

For example:

 persion:
          name: zhangsan
          age: 10

Inline writing:

persion: {name: zhangsan,age: 10}

Array (List, Set, Map)

Ordinary array, List, Set uses - value to represent an element in the array

arrays:
  - arrays1 
  - arrays2  
  - arrays3

Map uses the form of k: v to represent

map:
  k1: v1
  k2: v2
  k3: v3

Use configuration file injection

Introduce dependencies in pom.xml , used by the annotation processor to generate its own metadata

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>

Entity class:

/**
 * persion类
 */
@Component
@ConfigurationProperties(prefix = "persion")
public class Persion {
    private String name;
    private int age;
    private boolean isMan;
    private Date birth;
    private String[] hobbys;
    private Map<String,String> skills;
    private List<String> enjoys;

    // 省略getter setter toString
}

yaml configuration:

persion:
  name: zhangsan
  age: 20
  isMan: true
  birth: 1997/11/12
  hobbys:
    - 篮球
    - 足球
    - 乒乓球
  skills:
    java: javase
    python: ai
  enjoys:
    - eating
    - running
    - playgames

Test class

@Autowired
    Persion persion;

    @Test
    public void contextLoads() {
        System.out.println(persion);
    }

2. Server configuration

Change port:

server.port=8081

Change context access path, SpringBoot default sample path is "/":

server.servlet.context-path=/base

Common server configuration

server.port:SpringBoot监听端口
server.error.path:错误处理路径
server.servlet.context-path:配置SpringBoot默认上下文路径

Three log configuration

Define log level

Log level ERROR WARN DEBUF INFO TRACE level from high to low

# 输出日志级别 ERROR WARN DEBUF INFO TRACE，日志只会打印当前级别，以及高于当前级别的日志
logging.level.root=info

Output log to file

# 输出日志到文件
logging.file=/my.log

Define log Output format
Log format output to the console:

logging.pattern.console=【%level %date %logger %thread %M %L %m】 %n

Log format output to the log file:

# 定义输出到文件的日志格式
logging.pattern.file=【%level %date %logger %thread %M %L %m】 %n

Basic parameters of log format

属性    内容
%level    表示输出日志级别
%date    表示日期发生时的时间
%logger    用于输出Logger名字，包名+类名，{n}限定输出长度
%thread    当前线程名
%M    日志发生时方法的名字
%L    日志调用所在代码行
%m    日志消息
%n    日志换行

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