Deploy vue to java web

In the field of modern front-end development, Vue.js is a very popular JavaScript framework. Vue.js provides reusable components, virtual DOM, and one-way data flow, making it easier and more efficient to build interactive user interfaces. Java Web technology includes a collection of Java technologies for developing Web applications. In actual development scenarios, we often need to deploy Vue.js front-end applications to the Java Web back-end. This article explains how to deploy a Vue.js application into a Java web project.

1. Create a Vue.js application
   First, we need to create a Vue.js application. We can use the vue-cli command line tool, which can help us quickly create templates for Vue.js applications. Execute the following command in the command line terminal:

vue create my-app

where, my-app is the name of the project you want to create.

During the project creation process, Vue.js will ask you what features and plugins you need. You can choose according to your needs or use the default options. After the project is successfully created, we can find the main JavaScript entry file of the Vue.js application (usually the main.js file) and the files of the Vue.js component in the src directory in the project.

2. Building a Vue.js application
   Before deploying a Vue.js application into a Java web project, the Vue.js application needs to be built into a deployable static file. Vue.js provides a command line tool called vue-cli-service that can help us quickly build Vue.js applications. Execute the following command in the command line terminal:

npm run build

This command will automatically build the Vue.js application and generate static files to the dist directory of the project.

3. Create Java Web Project
   Next, we need to create a Java Web project for deploying Vue.js applications. In development tools such as Eclipse and IntelliJ IDEA, we can use built-in templates to create Java Web projects.

Create a directory named webapp in the project and copy the static files generated in the dist directory to the directory. Be sure to ensure that the index.html file in the static file is the entry file of the project.

4. Configuring Servlet
   In the above steps, we have deployed the Vue.js application to the Java Web project. However, when a user accesses the application, the Java Web project will use its own index.html file as the entry file by default, rather than the entry file of the Vue.js application. Therefore, we need to configure a Servlet to handle requests for access to the root directory path of the Vue.js application. We can add the following configuration in the web.xml file:

<servlet>
<servlet-name>vueServlet</servlet-name> 
<servlet-class>com.example.servlet.VueServlet</servlet-class> 
</servlet> 

<servlet-mapping> 
<servlet-name>vueServlet</servlet-name> 
<url-pattern>/</url-pattern> 
</servlet-mapping>

Explain these configurations: We create a Servlet named vueServlet and map it to the root path /. This way, when a user accesses the application, the Java Web project looks for the vueServlet servlet and uses that servlet to answer the user's request. We can load the entry file index.html of the Vue.js application into the Servlet and return it to the user as a response.

The following is a Java code example for VueServlet:

public class VueServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    req.getRequestDispatcher("/index.html").forward(req, resp);
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    doGet(req, resp);
}
}

5. Start the Java Web Project
   Now, we have successfully deployed the Vue.js application to the Java Web project. We can start a Java web project and use a web browser to access the root directory path (usually http://localhost:8080/) to see the Vue.js application in action.

Conclusion
This article describes how to deploy a Vue.js application into a Java web project. We built the Vue.js application using the vue-cli tool, added static files in a Java web project, and created a Servlet to handle requests. In this way, we can combine the Vue.js front-end part and the Java back-end part to build a complete web application.

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