Springboot入门之配置文件

小鱼儿 2023-09-25 17:48 48阅读 0赞

**1.全局固定配置文件**

1.1）application.properties

1.2）application.yml

1.3）bootstrap vs application \[.yml/properties\]

boostrap 被父ApplicationContext加载，加载顺序优先与application\[使用ApplicationContext加载\]，boostrap中配置的信息无法被修改覆盖【常用于Springcloud配置中心，加解密秘钥等配置】，application中的配置信息可以被修改覆盖【用于项目的自动化配置】。

**2.yml使用**

2.1）配置

data:
      aInteger: 1
      aLong: 10000
      aFloat: 3.14
      aDouble: 3.14159
      aBoolean: true
      aString: adcd
      aArray: 1,2,3
      aList: 1,2,3
      aSet: 1,2,3
      aMap: {name: "zha", age: 18}

2.2）读取

2.2.1）@Value读取

@Value("${data.aInteger}")
    private Integer intValue;
    
    @Value("${data.aLong}")
    private Long longValue;
    
    @Value("${data.aFloat}")
    private Float floatValue;
    
    @Value("${data.aDouble}")
    private Double doubleValue;
    
    @Value("${data.aBoolean}")
    private Boolean booleanValue;
    
    @Value("${data.aString}")
    private String stringValue;
    
    @Value("#{'$value.aArray}'.split(',')}")
    private String[] values;
    
    @Value("#{'${data.aList}'.split(',')}")
    private List<String> valueList;
    
    @Value("#{'${data.aSet}'.split(',')}")
    private Set<String> valueSet;
    
    @Value("#{${data.aMap}}")
    private Map<String, Object> valueMap;

2.2.2）@ConfigurationProperties配置

import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.stereotype.Component;
    
    import java.util.Arrays;
    import java.util.List;
    import java.util.Map;
    import java.util.Set;
    
    @Component
    @ConfigurationProperties(prefix = "data")
    public class DataConfig {
    
        private Integer aInteger;
        private Long aLong;
        private Float aFloat;
        private Double aDouble;
        private Boolean aBoolean;
        private String aString;
        private Integer[] aArray;
        private List<Integer> aList;
        private Set<Integer> aSet;
        private Map<String, String> aMap;
    
        public Integer getaInteger() {
            return aInteger;
        }
    
        public void setaInteger(Integer aInteger) {
            this.aInteger = aInteger;
        }
    
        public Long getaLong() {
            return aLong;
        }
    
        public void setaLong(Long aLong) {
            this.aLong = aLong;
        }
    
        public Float getaFloat() {
            return aFloat;
        }
    
        public void setaFloat(Float aFloat) {
            this.aFloat = aFloat;
        }
    
        public Double getaDouble() {
            return aDouble;
        }
    
        public void setaDouble(Double aDouble) {
            this.aDouble = aDouble;
        }
    
        public Boolean getaBoolean() {
            return aBoolean;
        }
    
        public void setaBoolean(Boolean aBoolean) {
            this.aBoolean = aBoolean;
        }
    
        public String getaString() {
            return aString;
        }
    
        public void setaString(String aString) {
            this.aString = aString;
        }
    
        public Integer[] getaArray() {
            return aArray;
        }
    
        public void setaArray(Integer[] aArray) {
            this.aArray = aArray;
        }
    
        public List<Integer> getaList() {
            return aList;
        }
    
        public void setaList(List<Integer> aList) {
            this.aList = aList;
        }
    
        public Set<Integer> getaSet() {
            return aSet;
        }
    
        public void setaSet(Set<Integer> aSet) {
            this.aSet = aSet;
        }
    
        public Map<String, String> getaMap() {
            return aMap;
        }
    
        public void setaMap(Map<String, String> aMap) {
            this.aMap = aMap;
        }
    
        @Override
        public String toString() {
            return "DataConfig{" +
                    "aInteger=" + aInteger +
                    ", aLong=" + aLong +
                    ", aFloat=" + aFloat +
                    ", aDouble=" + aDouble +
                    ", aBoolean=" + aBoolean +
                    ", aString='" + aString + '\'' +
                    ", aArray=" + Arrays.toString(aArray) +
                    ", aList=" + aList +
                    ", aSet=" + aSet +
                    ", aMap=" + aMap +
                    '}';
        }
    }

**3.多个profile appllication-\{profile\}.properties/yml**

3.1)appllication.yml

server:
      port: 80
    
    spring:
      profiles:
        active: dev

3.2)appllication-dev.yml

server:
      port: 8080

3.3)appllication-prod.yml

server:
      port: 8081

3.4)激活制定profile

3.4.1）spring.profiles.active=dev

3.4.2） java -jar xxx.jar -spring.profiles.active=dev

3.4.3） 设置java虚拟机参数 -DSpring.profiles.active=dev

**4.配置文件加载顺序**

\-file:./config

\-file:./

\-classpath:./config

\-classpath:./

优先级由高到底，加载application.yml/properties

外部配置文件 java -jar xxx.jar --server.port=8080 --server.context=/abc

**5.核心注解**

@SpringBootApplication（启动相关） = @SpringBootConfiguration(@Configuration) + @EnableAutoConfiguration + @ComponentScan(可无 手动加载Bean)

@SpringBootConfiguration 配置加载注解  
@EnableAutoConfiguration 自动化配置注解  
@ComponentScan 扫描+加载Bean

@Target({ElementType.TYPE})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    @Inherited
    @SpringBootConfiguration
    @EnableAutoConfiguration
    @ComponentScan(
        excludeFilters = {@Filter(
        type = FilterType.CUSTOM,
        classes = {TypeExcludeFilter.class}
    ), @Filter(
        type = FilterType.CUSTOM,
        classes = {AutoConfigurationExcludeFilter.class}
    )}
    )
    public @interface SpringBootApplication {
    
    }

**6.自动化配置流程【META-INF/spring.factories】**

**@EnableAutoConfiguration**  
=> @Import(\{AutoConfigurationImportSelector.class\})  
=> AutoConfigurationImportSelector.selectImports  
=> AutoConfigurationImportSelector.getAutoConfigurationEntry  
=> AutoConfigurationImportSelector.getCandidateConfigurations  
=> SpringFactoriesLoader.loadFactoryNames 扫描具有**META-INF/spring.factories包**

![c085a8ee39434fcc9e82eb80974eeb2e.png][]

![f554a94fd2b04e98b78284af32881253.png][]

![83e05ab8fd1d4a888020e4e467fae38a.png][]

![0c41ada22659472ba000e0f206bc43a7.png][]

![606992e364ea431b9cec518cbb9532d5.png][]

MybatisPlus **spring.factories 示例**

# Auto Configure
    org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
      com.baomidou.mybatisplus.autoconfigure.MybatisPlusLanguageDriverAutoConfiguration,\
      com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration

[c085a8ee39434fcc9e82eb80974eeb2e.png]: https://img-blog.csdnimg.cn/c085a8ee39434fcc9e82eb80974eeb2e.png
[f554a94fd2b04e98b78284af32881253.png]: https://img-blog.csdnimg.cn/f554a94fd2b04e98b78284af32881253.png
[83e05ab8fd1d4a888020e4e467fae38a.png]: https://img-blog.csdnimg.cn/83e05ab8fd1d4a888020e4e467fae38a.png
[0c41ada22659472ba000e0f206bc43a7.png]: https://img-blog.csdnimg.cn/0c41ada22659472ba000e0f206bc43a7.png
[606992e364ea431b9cec518cbb9532d5.png]: https://img-blog.csdnimg.cn/606992e364ea431b9cec518cbb9532d5.png