When the ASP.NET Core MVC web application starts, reads the name of the environment for an environment variable of the host computer. The compiled application contains the configuration for all supported environments, making possible to build and deploy the same artifact in every environment.
If the ASPNETCORE_ENVIRONMENT environment variable is not defined, the Production environment settings are loaded.
In Visual Studio the web application project sets the value on the Debug tab.
To set the environment on the server
To set the value globally that is preserved after restart
- Open the command prompt window and execute
setx ASPNETCORE_ENVIRONMENT Development /M
- Open a PowerShell window and execute
[Environment]::SetEnvironmentVariable("ASPNETCORE_ENVIRONMENT", "Development", "Machine")
- Add to the .bashrc or .bash_profile file
Configure the ASP.NET Core MVC web application
Create the environment-specific appsettings.json files
- In the web application project click the arrow next to the appsettings.json file to reveal the Development configuration file
- Right-click the appsettings.Development.json file and select Copy
- Right click the web application project and select Paste
- Rename the appsettings – Copy.Development.json file to appsettings.Production.json
- The file will automatically move under the appsettings.json file
Edit the configuration files
- Open the appsettings.Production.json file and add the connection string
When you create your first Spring MVC Java web application in the base installation of NetBeans follow the steps below
Create a project
- In the File menu select New Project…
- Select the Java Web category, select the Web Application project, and click Next,
- Enter the name of the project and click Next,
- If this is the first Java web application you create in NetBeans, most likely there is no web server for Java is installed on your workstation. If this is the case, click the Add… button,
- Keep the GlassFish Server selected and click Next,
- Select the I have read… checkbox and click the Download Now… button,
- Keep the latest version selected and click OK,
- Make sure the I have read… checkbox is still selected, and click Next,
- Click Finish to register the domain on your workstation,
- The Context Path shows the address for your application. Click Finish again to continue.
- Select the Spring Web MVC framework and click Finish.
- If a library is missing from your workstation, a message pops up. Click the Resolve Problems… button for instructions,
- On the Resolve Project Problems window click the Resolve… button,
- Download the missing library to your workstation. In this case, navigate your web browser to http://www.java2s.com/Code/Jar/j/Downloadjavaeeendorsedapi70jar.htm
- Download the “javaee-endorsed-api-7.0.jar” library
- Create the folder C:\Users\YOUR_USER_NAME\AppData\Roaming\NetBeans\8.2\modules\ext\javaee7-endorsed
- Extract the “javaee-endorsed-api-7.0.jar” file into the new folder,
- On the Ant Library Manager window click the New Library… button,
- Enter “javaee-endorsed-api-7.0” into the Library Name field and click OK,
- Click the Add JAR/Folder… button,
- Navigate the to extracted JAR file at “C:\Users\YOUR_USER_NAME\AppData\Roaming\NetBeans\8.2\modules\ext\javaee7-endorsed” and click the Add JAR/Folder button,
- On the Ant Library Manager window click the OK button,
- On the Resolve Project Problems window click Close.
Start the application
- In the Project list right-click the web application project and select Run
- The Output window should display a similar message,
- Open a web browser and navigate to http://localhost:8080/MY_PROJECT_NAME, to display the index page. The server is case sensitive, so make sure the spelling of the project name is correct.
The application configuration files
With the default settings the index.jsp composes the index page. It is in the Web Pages/WEB-INF/jsp directory.
The web.xml file in the Configuration Files directory points to the first Java Server Pages file: redirect.jsp
The redirect.jsp file is located in the Web Pages directory
The dispatcher-servlet.xml file contains the mapping between the HTML file, controller, and view.
The bean section specifies the name of the view for the controller.
The index controller.
Web Application Build and Deployment
To generate a war file of your web application
- In the Project Files directory right click the pom.xml file and select Run Maven > Goals…
- In the Goals field type
and click OK
- NetBeans creates the war file in the target directory.
Corporations maintain multiple server environments for development, testing and production purposes.
All of these environments require specific settings to connect to the databases and other resources. When the build master builds the application for the specific environment the build process has to select the appropriate configuration and build it into the installer file for deployment.
It is a good practice to store these environment specific config files in a folder that also designates the Visual Studio version.
Console applications and Windows services
For console applications and Windows services place this folder into the “Source” folder.
In Microsoft Visual Studio you can add a folder to a project, but it will be created in the directory where the project file is located. To add a folder to a project when the folder is not in the project directory we have to manually edit the project file. In this example we will add a folder to our main project that contains the environment specific config files. The “Config_2012” folder is located in the “Source” folder outside of the “Project_2012” project directory.
The following steps will add the “Config_2012” folder to the project
- Create the “Config_2012” folder in Windows Explorer
- Add the environment specific config files to it
- Add the folder to source control
- Open the solution in Visual Studio
- Right click the main project and select Unload Project
- Right click the main project again and select Edit…
- Add the following to the project file
- Save the project file
- Right click the main project file and select Reload Project
The “Config_2012” folder will appear in the Solution Explorer and the config files will be added as linked files.
Web applications and web services
For web applications and web services place the Config folder into the web application folder
To add the config folder and files to the web application
- Open the web solution in Visual Studio
- Select the web project
- Click the Show All Files button on the Solution Explorer toolbar
- The Solution Explorer will display all files in the web application folder
- Right click the Config_2012 folder and select Include In Project
- Select all the config files in the Config_2012 folder
- Right click the selection and select Properties
- Set the Build Action to None
- Click the Show All Files button on the Solution Explorer toolbar again to hide the excluded files