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

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.

Answer 2

1) Better way is by using src/main/resources

2) yes, but this messageshave different purpose

3)

One way to make a bean from the properties file in src/main/resources:

<bean id="foldersConfig" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
   <property name="location" >
      <value>/WEB-INF/classes/folders.properties</value>
   </property>
</bean>

And in your controller simply inject the reference.

Here how your controller will look like, the xml:

<bean id="myController" class="my.project.package.controller.MyController">
 ...
 <property name="foldersConfig" ref="foldersConfig" />
</bean>

The controller class, related part:

public class MyController extends ... {

 private Properties foldersConfig;

 public void setFoldersConfig(Properties config) {
   this.foldersConfig = config;
 }
}

4) You can access if you put the properties in the View - Model, but this not good solution. Take what you need in the controller (the paths) and put it in the result.