跟我学springboot（十）springboot配置文件的占位符

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1.随机数

比如

${random.value}、${random.int}、${random.long}
${random.int(10)}、${random.int[1024,65536]}

2.占位符获取之前配置的值，如果没有可以是用:指定默认值

${person.hello:hello} 如果person.hello没有指定值则默认为hello，如果在配置文件中指定了person.hello=test则person.dog.name=${person.hello:hello}_dog在运行时候打印为test_dog

person.last‐name=张三${random.uuid}
person.age=${random.int}
person.birth=2017/12/15
person.boss=false
person.maps.k1=v1
person.maps.k2=14
person.lists=a,b,c
person.dog.name=${person.hello:hello}_dog
person.dog.age=15

3.运行

@PropertySource(value = {"classpath:person.properties"})
@Component
@ConfigurationProperties(prefix = "person")
public class Person {
    private String lastName;
    private Integer age;
    private Boolean boss;
    private Date birth;
    private Map<String,Object> maps;
    private List<Object> lists;
    private Dog dog;

application.properties

person.last-name=张三${random.uuid}
person.age=${random.int}
person.birth=2017/12/15
person.boss=false
person.maps.k1=v1
person.maps.k2=14
person.lists=a,b,c
person.dog.name=${person.hello:hello}_dog
person.dog.age=15

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringBootConfigApplicationTests {

    @Autowired
    Person person;

    @Test
    public void contextLoads() {
        System.out.println(person);
    }
}

运行结果：

Person{lastName='张三10ee71ca-8ecb-4fab-a4b5-422b54e16d3d', age=-871503876, boss=false, birth=Fri Dec 15 00:00:00 CST 2017, maps={k1=v1, k2=14}, lists=[a, b, c], dog=Dog{name='hello_dog', age=15}}