Using a class to read a properties file, in Java, spring

Question

I'm trying to use a PropertyReader class to get my information (portNumber, hostName, etc) from a test.properties file in java spring, but I am pretty confused on how to go about this because there seems to be a million different ways (resource bundle etc)... I would greatly appreciate any input! Here's what my code looks like. Oh and the names are the same as in the properties file.

@Configuration @PropertySource("classpath:test.properties") public class PropertyReader { private Environment environment; String portNumber; String hostName; String subjectName; String myUrl; String portProtocol; String hostProtocol; @Bean public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() { return new PropertySourcesPlaceholderConfigurer(); } public PropertyReader(String propertyFile) throws IOException {...}

I've already added

 <context:property-placeholder location="classpath:test.properties" />

to my context. but not sure how to go about getting the info as environment.getProperty doesn't seem to be recognized as a function...

Kevin Workman · Accepted Answer · 2015-01-08 19:39:22Z

For what it's worth, this is how I do it: https://github.com/KevinWorkman/StaticVoidGames/blob/master/StaticVoidGames/src/main/java/com/StaticVoidGames/spring/config/PropertiesConfig.java

An example PropertiesConfig file:

@Configuration @PropertySource("classpath:/live.properties") public class PropertiesConfig { @Value( "${property.name}" ) private String property; @Bean public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() { return new PropertySourcesPlaceholderConfigurer(); } }

And here's how I use those properties from a Controller class: https://github.com/KevinWorkman/StaticVoidGames/blob/master/StaticVoidGames/src/main/java/com/StaticVoidGames/spring/controller/StaticVoidGamesController.java

@Component public class ExampleController implements ExampleControllerInterface{ @Autowired private Environment env; public String viewHomePage(HttpServletRequest request, ModelMap model, HttpSession session){ String property = env.getProperty("property.name"); model.addAttribute("propertyValue", property); return "index"; } }

But you're right about there being a million different ways to do things. That's what makes programming so fun- and so frustrating!

quick question this code '@Value( "${property.name}" )' - would I do for every variable I have? and for mine, would that be like test.hostName? (since test is my .properties file name)?
@LoganStewart Yep! Check out the links to the actual source code that I use for a more complete example. This was just to show the basics in a StackOverflow-friendly way.
One question, when I try to autowire Environment, it says it cannot because there is no beans found, do you know why? thanks again!

mariubog · Accepted Answer · 2015-01-08 20:55:41Z

I would recomend using Typesafe Configuration Properties, it keeps it litle bit cleaner and you do not need to use to many annotations.

http://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html#boot-features-external-config-typesafe-configuration-properties

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