Master Spring Boot Property Configuration: Custom Props, Random Values, and Multi‑Profile Setup

Custom Properties and Loading

Spring Boot lets you define your own configuration keys directly in application.properties. For example:

com.didispace.blog.name=程序猿DD
com.didispace.blog.title=SpringBoot教程

These values can be injected into a component using the @Value("${property.name}") annotation:

@Component
public class BlogProperties {
    @Value("${com.didispace.blog.name}")
    private String name;

    @Value("${com.didispace.blog.title}")
    private String title;
    // getters and setters omitted
}

A simple unit test can verify that the properties are correctly bound:

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(Application.class)
public class ApplicationTests {
    @Autowired
    private BlogProperties blogProperties;

    @Test
    public void getHello() throws Exception {
        Assert.assertEquals("程序猿DD", blogProperties.getName());
        Assert.assertEquals("SpringBoot教程", blogProperties.getTitle());
    }
}

Parameter References

Properties can reference each other using the ${…} syntax. For instance, defining a description that reuses name and title:

com.didispace.blog.desc=${com.didispace.blog.name}正在努力写《${com.didispace.blog.title}》

The resolved value becomes 程序猿DD正在努力写《SpringBoot教程》.