springboot之读取配置文件(application.yml)中的属性值
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2022-05-08 10:56:45
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一、封装成对象
1、引入依赖:
<!-- 支持 @ConfigurationProperties 注解 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
2、配置文件(application.yml)中配置各个属性的值:
myProps: #自定义的属性和值
simpleProp: simplePropValue #普通的值(数字,字符串,布尔)
arrayProps: 1,2,3,4,5 #数组 String[]
listProp1: #集合 List<Map<String,String>>
- name: abc
value: abcValue
- name: efg
value: efgValue
listProp2: #集合 List<String>
- config2Value1
- config2Vavlue2
mapProps: #对象、Map (属性和值) (键值对) Map<String,String>
key1: value1
key2: value2
3、创建一个bean来接收配置信息:
@Component
@ConfigurationProperties(prefix = "myProps") //接收application.yml中的myProps下面的属性
public class MyProps {
private String simpleProp;
private String[] arrayProps;
private List<Map<String, String>> listProp1 = new ArrayList<>(); //接收prop1里面的属性值
private List<String> listProp2 = new ArrayList<>(); //接收prop2里面的属性值
private Map<String, String> mapProps = new HashMap<>(); //接收prop1里面的属性值
public String getSimpleProp() {
return simpleProp;
}
//String类型的一定需要setter来接收属性值;maps, collections, 和 arrays 不需要
public void setSimpleProp(String simpleProp) {
this.simpleProp = simpleProp;
}
public List<Map<String, String>> getListProp1() {
return listProp1;
}
public List<String> getListProp2() {
return listProp2;
}
public String[] getArrayProps() {
return arrayProps;
}
public void setArrayProps(String[] arrayProps) {
this.arrayProps = arrayProps;
}
public Map<String, String> getMapProps() {
return mapProps;
}
public void setMapProps(Map<String, String> mapProps) {
this.mapProps = mapProps;
}
}
启动后,这个bean里面的属性就会自动接收配置的值了。
4、单元测试用例:
@Autowired
private MyProps myProps;
@Test
public void propsTest() throws JsonProcessingException {
System.out.println("simpleProp: " + myProps.getSimpleProp());
System.out.println("arrayProps: " + myProps.getArrayProps());
System.out.println("listProp1: " + myProps.getListProp1().toString());
System.out.println("listProp2: " + myProps.getListProp2().toString());
System.out.println("mapProps: " + myProps.getMapProps().toString());
}
测试结果:
simpleProp: simplePropValuearrayProps: ["1","2","3","4","5"]
arrayProps: ["1","2","3","4","5"]
listProp1: [{"name":"abc","value":"abcValue"},{"name":"efg","value":"efgValue"}]
listProp2: ["config2Value1","config2Vavlue2"]
mapProps: {"key1":"value1","key2":"value2"}
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