[Master] Two configuration file syntaxes of springboot
Import the package automatically prompted by the configuration file
Create Student class
Create and modify application.properties
Profile placeholder
$ {random.int} generates an int random number
$ {random.value} generates a random string
$ {random.long} generates a long random data
$ {random.int (10)} generates 0-10 random int numbers
$ {random.int [10,100]} Random int number from 10 to 100
$ {sutudent.name} reads the name property in the student object in the ioc container
Description of the two grammars
Properties have no hierarchical relationship using = assignment
Yml has a hierarchical relationship Use: Assignment
The configuration of the two grammars is complementary
@Value read configuration file and verify processing
@Value read configuration file
Fact sheet
1. If the configuration is written in properties, only the Map cannot be obtained
2. If the configuration is written in the yml array collection, you can't get it
3 , if the attribute is using camel case nomenclature , you cannot use attribute name injection ,
To use @Value ("$ {student.user-name}") to get the value
Cannot use @Value ("$ {student.userName}") to get the value
