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：

        <!-- 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"} 

 

配置文件单个属性值注入：

application.yml如属性值:text

server:
  port: 8081
  context-path: /girl
text: 123

 

用来测试的Controller:

@RestController
public class HelloController {
    @Value("${text}")
    private String text;

    @RequestMapping(value = "/hello" , method = RequestMethod.GET)
    public String start(){
        return "hello spring boot"+text;
    }
}

 

 

 

转自出处：http://blog.csdn.net/clementad/article/details/51970962