The technical principles of the Polymer framework in the Java library analyzes in -depth analysis

Polymer is a JavaScript framework based on the Web Components standard, which is used to build a reusable web component.It provides a set of tools and libraries to help developers quickly build a modern web application.So, let's take a closer look at the technical principles of the Polymer framework in the Java class library. Polymer's biggest feature is its component development model.By using Polymer, we can split the application into multiple independent web components. Each component has its own internal logic and external interface.This method of componentization makes the development of applications more modular and maintained. The core of the Polymer framework is the Polymer library, which provides some basic classes and functions to define and register web components.In order to start using Polymer, we first need to import the jar file of the Polymer library to our Java project. In Polymer, the component is defined in the form of the JavaScript object.For example, we can create a simple Polymer component as shown below: public class MyComponent extends PolymerComponent { public MyComponent() { super("my-component"); } @Override protected void ready() { // The logic of execution after the component initialization is completed } @Override public void attached() { // The logic of the component is added to the DOM tree } @PolymerAttribute public native String getMyProp(); @PolymerAttribute public native void setMyProp(String value); @PolymerMethod public native void myMethod(); } In the above code, we created a Polymer component called "Mycomponent".We define two ways of life cycle, namely "Ready" and "Attached", which are triggered when the component initialization is completed and the component is added to the DOM tree.We also define a attribute called "MyProp" and use @Polymerattribute annotations to mark it.In this way, we can access and modify this attribute through Getters and Setters.Finally, we defined a method called "MyMethod" and used @PolymerMethod to mark it.This method can be called through event in other components. In Polymer, the templates and styles of the component are defined by HTML and CSS.We can use the HTML template syntax in the Polymer component to create the structure of the component, such as: html <dom-module id="my-component"> <template> <h1>Hello World!</h1> <p>This is my Polymer component.</p> </template> <style> :host { display: block; background-color: #f5f5f5; padding: 10px; } h1 { color: #333; } p { font-size: 14px; } </style> </dom-module> In the above code, we define a DOM module with an ID "my-component".The template part is the structure of the component, and the style part is the definition of the component.In this way, we can encapsulate the HTML content and style of the entire component and load and use it through the Polymer library. Use the Polymer framework in the Java library, and we need to add Polymer.jar to the project dependency management.We can then create our own Polymer components and use them in the Java code. To sum up, the technical principles of the Polymer framework in the Java class library are mainly based on the Web Components standard, which uses the Polymer library to define and register the web component.It supports component development models and provides comments of some life cycle methods, attributes and methods, which is convenient for us to write and manage Polymer components.By using the HTML template syntax and CSS style to define the structure and appearance of the component, we can pack the Polymer component in the Java library and use them in the Java project.