Steps to use the GWT user framework in the Java class library
Steps to use the GWT user framework in the Java class library
Google Web Toolkit (GWT) is an open source framework for creating web -based applications.It allows developers to use Java to write front -end code and convert it into optimized JavaScript code.The GWT user framework is a component of the GWT framework. It provides a powerful and easy -to -use user interface component, which simplifies the process of front -end development.The following is the step of using the GWT user framework in the Java class library:
1. Set the dependencies of the GWT user framework: First of all, you need to add the dependencies of the GWT user framework to your Java project.This step can be completed by Maven or manually downloading and adding jar files.
2. Create the entrance point of the GWT user framework: The entrance point class is the starting point of the GWT application. It is responsible for initializing the application and loading the user interface.Create a Java class inherited from the Java class inherited from the `Com.google.gwt.Core.Client.entrypoint` class, and implement its` ONMODULELOAD () method.
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;
public class MyApp implements EntryPoint {
public void onModuleLoad() {
// Initialize the application and user interface here
// Create and add a component of the GWT user framework
// ...
MyComponent myComponent = new MyComponent();
RootPanel.get().add(myComponent);
}
}
3. Create a GWT user framework component: The GWT user framework provides many custom and reusable user interface components.You can create these components according to the needs of the application.These components are usually inherited from `com.google.gwt.user.client.ui.widget`.
import com.google.gwt.user.client.ui.Label;
public class MyComponent extends Label {
public MyComponent() {
setText("Hello, GWT User Framework!");
}
}
4. Compile and deploy GWT applications: Use the GWT compiler to convert the Java code into JavaScript code and deploy it to the web server.
Run the following commands in the command line to compile the GWT application:
$ java -cp gwt-user.jar com.google.gwt.dev.Compiler -war <output_dir> <module_name>
Among them, `GWT-User.jar` is the jar file of the GWT user framework. The output directory of the compiled JavaScript code is the compiled name of the compiled JavaScript code.
After the compilation is completed, a JavaScript file will be generated, and you can deploy it on the web server.
5. Introduced JavaScript file introduced in HTML: In your HTML file, use the `Script>` tag to introduce the generated JavaScript file.You also need to provide a container for applications to display the GWT user framework.
html
<html>
<head>
<script type="text/javascript" src="myapp/myapp.nocache.js"></script>
</head>
<body>
<div id="app"></div>
</body>
</html>
Here, `myApp/MyApp.nocache.js` is the path of the generated JavaScript file.` <Div ID = "app"> </div> `is a container used to display the GWT user framework component.
6. Run application: Deploy HTML files to the web server and access the file through a browser. You will be able to see applications running the GWT user framework.
Now, you have learned about the basic steps of using the GWT user framework in the Java library.According to your application needs, you can use various components provided by the GWT user framework to build a rich and powerful user interface.
