如何读取yml文件内容

叁歲伎倆 2022-02-12 10:14 382阅读 0赞

在spring boot中，读取配置文件（application.yml）中各种不同类型的属性值：

#### 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： ####

@RunWith(SpringRunner.class)
    @SpringBootTest
    public class DemoApplicationTests { 
    
        @Autowired
      	private MyProps myProps; 
    
    
        @Test
        public void contextLoads() { 
    
        }
        
        @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())); 
        }
    
    }

#### 5、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"}

`要是还有不太明白的地方请留言，评论必回`  
`要是对我的文章感兴趣的话，关注一下吧，谢谢！`

### 上一篇：[JAVA实时监控目录下文件的变化][JAVA] ###

### 下一篇：[如何配置log4j][log4j] ###

[JAVA]: https://blog.csdn.net/chen_2890/article/details/89641203
[log4j]: https://blog.csdn.net/chen_2890/article/details/89640607