How to get properties in JSP files using spring mvc 3

Question

I am very new to spring mvc 3 annotation based application. I have two properties files - WEB-INF\\resources\\general.properties, WEB-INF\\resources\\jdbc_config.properties

Answer 1

You need to distinguish between application properties (configuration) and localisation messages. Both use JAVA properties files, but they serve different purpose and are handled differently.

Note: I am using Java based Spring configuration in the examples bellow. The configuration can be easily made in XML as well. Just check Spring's JavaDoc and reference documentation.

---

Application Properties

Application properties should be loaded as property sources within your application context. This can be done via @PropertySource annotation on your @Configuration class:

@Configuration
@PropertySource("classpath:default-config.properties")
public class MyConfig  {

    @Bean
    public static PropertySourcesPlaceholderConfigurer propertyPlaceholderConfigurer() {
        return new PropertySourcesPlaceholderConfigurer();
    }

}

Then you can inject properties using @Value annotation:

@Value("${my.config.property}")
private String myProperty;

---

Localisation Messages

Localisation messages is a little bit different story. Messages are loaded as resource bundles and a special resolution process is in place for getting correct translation message for a specified locale.

In Spring, these messages are handled by MessageSources. You can define your own for example via ReloadableResourceBundleMessageSource:

@Bean
public MessageSource messageSource() {
    ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
    messageSource.setBasename("/WEB-INF/messages/messages");
    return messageSource;
}

You can access these messages from beans if you let Spring inject MessageSource:

@Autowired
private MessageSource messageSource;

public void myMethod() {
    messageSource.getMessage("my.translation.code", null, LocaleContextHolder.getLocale());
}

And you can translate messages in your JSPs by using <spring:message> tag:

<spring:message code="my.translation.code" />

Answer 2

I ended up using Environment

Add these lines to config

@PropertySource("classpath:/configs/env.properties")
public class WebConfig extends WebMvcConfigurerAdapter{...}

You can get the properties from controller using autowired Environment

public class BaseController {
    protected final Logger LOG = LoggerFactory.getLogger(this.getClass());

    @Autowired
    public Environment env;

    @RequestMapping("/")
    public String rootPage(ModelAndView modelAndView, HttpServletRequest request, HttpServletResponse response) {
        LOG.debug(env.getProperty("download.path"));
        return "main";
    }
}

Answer 3

Firstly import spring tag lib:

<%@ taglib prefix="security" uri="http://www.springframework.org/security/tags" %>  

Than import property from your application.properties

<spring:eval var="registration_url" expression="@environment.getProperty('service.registration.url')"/>  

Than use your variable

<a href="<c:out value="${registration_url}"/>" class="btn btn-primary btn-block"> test </a>