springboot如何读取配置文件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：

<!-- 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 
 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<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: " + 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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程小技巧。

springboot如何读取配置文件application.yml中的属性值

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