This is the first day of my participation in the August More Text challenge

1. Purpose: in the code for the application. The properties/yml in data

1 Obtain single data
/ / 1
@Value("${spring.map.url}")
private String url;

/ / 3 calls
public void aVoid(){system.out. println(" path is "+ url); }Copy the code
Spring: map: url: 127.0.0.1:9000Copy the code
2 Match data in batches
/ / 1 class match
@Component
@ConfigurationProperties(prefix = "person")
public class Person {
    private String lastName;
    private Integer age;
    private Booleanboss; . Omit getset, tostring, etcCopy the code
#2 Config file person: lastName: Battle 3 Age: 12 boss: trueCopy the code
@autowired private Person Person; @RequestMapping("/test1") public void aVoid(){ System.out.println(person.toString()); }Copy the code

3 extension

// Matches the specified configuration file

@PropertySource(value = “classpath:person.yml”)

2 Purpose: Add a new component to SpringBoot

@configuration // Config class public Class MyAppConfig {// Add the return value of the method to the container. The default id of the bean in the container is the method name helloService @bean public helloService HelloService (){system.out.println (" Add to container "); return new HelloService(); }}Copy the code

3 Placeholder in YML

1 can write random numbers

1${random.uuid} age: 121${random.int}Copy the code

2 placeholder to get the value previously configured. If not, you can set the default value

abc: ${person.age:12}
Copy the code

4 Configuring multiple environments

4.1 Configuration in YML

Spring: Profiles: Active: test Currently is the test environmentCopy the code

Start configuration in 4.2 IDEA

5 Resours multiple configuration files

Yml is used as the default configuration file. Multiple configurations are loaded based on their priorities. The configuration with a higher priority overwrites the configuration with a lower priority.

From high —– to low

You can also change the default configuration by configuring spring.config.location.

6 Add components to the container based on the specified conditions.

You can set debug=true in YML to view the debug mode during springboot startup