使用@PropertySource和外部JSON文件配置Spring属性

Question

I am using spring boot with an access to keycloak. I need to leave the keycloak configuration in the keycloak.json file I would like to get teh values from the json using the PropertySource annotation...

My application.yml

keycloak:
   configurationFile: "classpath:keycloak.json"

My keycloak.json

{
  "realm": "MyRealm",
  "auth-server-url": "https://keycloakURL",
....
}

My class

@Controller
@Configuration
@PropertySource("classpath:keycloak.json")
public class MyClass{

@Autowired
private Environment env;

@RequestMapping(value = "/mycontroller", method = RequestMethod.GET)
    public String method(Model model) {
    env.getProperty("auth-server-url")
}

The problem is that i am getting null for this environment variable

Answer 1

If env is null, maybe the issue is with the import.

org.springframework.core.env.Environment

Else if the value queried from the environment is empty. In spring boot application, configuration of JSON file as property is quite different please refer the Example 1 , Example 2

Answer 2

I know using @Value is somewhat discouraged in favor of env.getProperty() , but I found the former much more reliable and straight forward. The proper way to use @Value from a PropertySource is described in mkyong's great tutorial

To resolve ${} in @Values, you must register a static PropertySourcesPlaceholderConfigurer in either XML or annotation configuration file.

Answer 3

目前尚不可能，但是我们有一张票https://issues.jboss.org/browse/KEYCLOAK-4942