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: 1aLong: 10000aFloat: 3.14aDouble: 3.14159aBoolean: trueaString: adcdaArray: 1,2,3aList: 1,2,3aSet: 1,2,3aMap: {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 valueList;@Value("#{'${data.aSet}'.split(',')}")
private Set valueSet;@Value("#{${data.aMap}}")
private Map 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 aList;private Set aSet;private Map 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 getaList() {return aList;}public void setaList(List aList) {this.aList = aList;}public Set getaSet() {return aSet;}public void setaSet(Set aSet) {this.aSet = aSet;}public Map getaMap() {return aMap;}public void setaMap(Map aMap) {this.aMap = aMap;}@Overridepublic 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: 80spring: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:./

优先级又高到底，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

 MybatisPlus spring.factories 示例

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