在spring boot中，简单几步，读取配置文件（application.yml）中各种不同类型的属性值：
1、引入依赖：
org.springframework.bootspring-boot-configuration-processortrue
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
arrayProps: 1,2,3,4,5
listProp1:
- name: abc
value: abcValue
- name: efg
value: efgValue
listProp2:
- config2Value1
- config2Vavlue2
mapProps:
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> listProp1 = new ArrayList<>(); //接收prop1里面的属性值
private List listProp2 = new ArrayList<>(); //接收prop2里面的属性值
private Map 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> getListProp1() {
return listProp1;
}
public List getListProp2() {
return listProp2;
}
public String[] getArrayProps() {
return arrayProps;
}
public void setArrayProps(String[] arrayProps) {
this.arrayProps = arrayProps;
}
public Map getMapProps() {
return mapProps;
}
public void setMapProps(Map 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: " + objectMapper.writevalueAsString(myProps.getArrayProps()));
System.out.println("listProp1: " + objectMapper.writevalueAsString(myProps.getListProp1()));
System.out.println("listProp2: " + objectMapper.writevalueAsString(myProps.getListProp2()));
System.out.println("mapProps: " + objectMapper.writevalueAsString(myProps.getMapProps()));
}
测试结果：
simpleProp: simplePropValue
arrayProps: ["1","2","3","4","5"]
listProp1: [{"name":"abc","value":"abcValue"},{"name":"efg","value":"efgValue"}]
listProp2: ["config2Value1","config2Vavlue2"]
mapProps: {"key1":"value1","key2":"value2"}
源代码参考：https://github.com/xujijun/my-spring-boot
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