1 file type

1 properties

Same as previous properties usage.

Such as common database connection configuration files: jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8
jdbc.username=root
jdbc.password=root

read configuration file

    @Test
    public void test1() throws IOException {
    
    
        InputStream inputStream = this.getClass().getResourceAsStream("jdbc.properties");
        Properties properties = new Properties();
        properties.load(inputStream);
        properties.list(System.out);
        System.out.println("==============================================");
        String property = properties.getProperty("jdbc.url");
        System.out.println("property = " + property);
    }

2 yaml

1 Description

YAML is a recursive acronym for "YAML Ain't Markup LanguageM (YAML is not a markup language). When this language was developed, YAML actually meant: "Yet Another Markup Language" (still a markup language).

Great for data-centric profiles

2 Grammar

key: value; there is a space between kv
Case Sensitive
Use indentation to indicate hierarchical relationships
Tabs are not allowed for indentation, only spaces are allowed
The number of spaces indented is not important, as long as the elements of the same level are left-aligned
#Represents comments
The string does not need to be quoted. If you want to add it, "and" M means that the string content will be escaped/unescaped

3 data types

Literals: A single, indivisible value. date, boolean, string, number, nul

k: v

Object: A collection of key-value pairs. map, hash, set, object

# 行内写法： 
k: {
    
    kl:vl,k2:v2,k3:v3}
# 或者
k:
    kl: vl
    k2: v2
    k3: v3

Array: A group of values arranged in order. array, list, queue

# 行内写法： 
k: {
    
    vl,v2,v3}
# 或者
k:
    - vl
    - v2
    - v3

4 cases

@Data
public class Person {
    
    

    private String userName;
    private Boolean boss;
    private Date birth;
    private Integer age;
    private Pet pet;
    private String[] interests;
    private List<String> animal;
    private Map<String,Object〉score;
    private Set<Double> salarys;
    private Map<StringJ List<Pet>> allPets;
}
    
@Data
public class Pet {
    
    
    private String name;
    private Double weight;
}

Corresponding configuration file:

# yaml表示以上对象
person:
    userName: zhangsan
    boss: false
    birth: 2019/12/12 20:12:33
    age: 18
    pet:
      name: tomcat
      weight: 23.4
    interests: [篮球，游泳]
    animal:
         - jerry
         - mario
    score:
        english:
            first: 30
            second: 40
            third: 50
        math: [131,140,148]
        Chinese: {
    
    first: 128,second: 136}
    salarys: [3999,4999.98,5999.99]
    allPets:
        sick:
            - {
    
    name: tom}
            - {
    
    name: jerry,weight: 47}
        health:[{
    
    name: mario,weight: 47}]

3 Configuration Tips

There is generally no prompt for custom class and configuration file binding. You can increase the prompt by adding dependencies.

<dependency>
    <groupId>org.springframework.boot</groupId >
    <artifactId>spring-boot-configuration-processors/artifactId>
    <optional>true</optional〉
</dependency>
        
 < build>
    <plugins>
    < plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <configuration>
        <excludes>
            <exclude>
                <groupId >org.springframework.boot</gnoupId>
                <artifactId >spring- boot-configuration-processors</artifactId>
            </exclude>
        </excludes>
        </configuration>
    </plugin>
    </plugins>
 </build>

Configuration file for Spring Boot development