Accessing Application Properties in Spring-MVC

Question

New to Spring-MVC.

I want to store two properties (uploadFolder=.., downloadFolder=..) in a .properties file and access it in HomeController class (automatically created by the MVC template).

Can you please guide me how..

1) Created an app.properties file with the above and placed it under /src/main/resources. is this correct or should it go under /webapp/resources?

2) Placed a bean in servlet-context.xml in the following manner. is this correct?

<beans:bean id="messageSource"
   class="org.springframework.context.support.ResourceBundleMessageSource">
   <beans:property name="basename" value="app" />
</beans:bean>

3) Now how do I access this in Java controllers?

4) How do I access these in a JSP?

I can't tell how much I will thank you.

Answer 1

There are a few different ways to do it. I do the following. In app context:

<util:properties id="myProps" location="classpath:app.properties" />

Make sure you have the following at the top of your file to include the "util" namespace:

xmlns:util="http://www.springframework.org/schema/util" 
xsi:schemaLocation= "... http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd"

I usually put my properties files in src/main/resources. As long as they're on the classpath, you're good. Then, in your controller, you can annotate your field/method with:

@Controller
public class MyController {

    @Value("#{myProps['uploadFolder']}")
    private String uploadFolder

    @Value("#{myProps['downloadFolder']}")
    private String downloadFolder

    @RequestMapping("myPage")
    public String loadPage(ModelMap m) {
        m.addAttribute("uploadFolder", uploadFolder);
        m.addAttribute("downloadFolder", downloadFolder);
        return "myPage";
    }

    public void setUploadFolder(String uploadFolder) {
        this.uploadFolder = uploadFolder;
    }
    public void setDownloadFolder(String downloadFolder) {
        this.downloadFolder = downloadFolder;
    }
}

Then, in your JSP:

Download folder: ${downloadFolder} <br/>
Upload folder: ${uploadFolder}

HTH. Let me know if you have any questions.