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"}
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