在Spring-MVC中访问应用程序属性 [英] Accessing Application Properties in Spring-MVC

问题描述

Spring-MVC新手。

New to Spring-MVC.

我想在.properties文件中存储两个属性（uploadFolder = ..，downloadFolder = ..）和
在HomeController类中访问它（由MVC模板自动创建）。

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

你能指导我如何...

Can you please guide me how..

1）使用上面的内容创建了一个app.properties文件，并将其放在/ src / main / resources下。这是正确的还是应该在/ webapp / resources下？

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）以下面的方式在servlet-context.xml中放置一个bean。这是正确的吗？

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）现在如何在Java控制器中访问它？

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

4）如何在JSP中访问这些？

4) How do I access these in a JSP?

我不知道我会多么感谢你。

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

推荐答案

有几种不同的方法可以做到这一点。我做了以下几点。在应用程序上下文中：

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

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

确保文件顶部有以下内容以包含util命名空间：

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"

我通常将我的属性文件放在src / main / resources中。只要他们在课堂上，你就是好人。然后，在您的控制器中，您可以使用以下命令注释您的字段/方法：

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;
    }
}

然后，在你的JSP中：

Then, in your JSP:

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

HTH。如果您有任何问题，请告诉我。

HTH. Let me know if you have any questions.

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