Spring Boot系列 – 4. 读取配置文件（application.yml）中的属性值

<!-- 支持 @ConfigurationProperties 注解 --> 
 <dependency> 
  <groupId>org.springframework.boot</groupId> 
  <artifactId>spring-boot-configuration-processor</artifactId> 
  <optional>true</optional> 
 </dependency> 

 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  

 @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;  
     }  
 }  

 @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()));  
     }  

 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"}