spring boot 读取配置文件（application.yml）中的属性值

转自Clement-Xu的csdn博客

之前一直想着用 @Value(“${xxx}”) 注解来导入配置文件中的配置信息，一直不能注入。转个弯，用这种方式就可以了.仔细看例子的话，发现逗号隔开的可以直接用数组来接收，下一级的可以直接用map接收等等

1、引入依赖：

<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
4000
{
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;
}
}

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"}