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

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：

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<!-- 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：

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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：

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@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：

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@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：

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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