Oracle JSF 1.2 Normal Api usage guide: Java class library implementation
Oracle JSF 1.2 Normal Api usage guide: Java class library implementation
Javaseerver Faces (JSF) is a Java EE standard for building a web -based user interface.It provides a rich set of APIs and components to simplify the development process of web applications.This article will introduce how to use Oracle JSF 1.2 specification API for development, including related Java libraries implementation and necessary programming code and configuration.
First, you need to learn about the following important concepts:
1. JSF component: JSF provides a rich set of custom components to build a user interface for Web applications.You can use these components to display data, process user input, etc.Common JSF components include input boxes, buttons, tables, etc.
2. Configuration file: The JSF application uses a configuration file called Faces-config.xml to define the application behavior.You can configure routes, data sources, verification rules, etc. in this file.
3. JSF Life cycle: The life cycle of the JSF application consists of a series of stages, including request processing, component tree construction, event processing, rendering, etc.Understanding the working principle of the JSF life cycle is very important for the correct use of the API.
Now, let's take a look at a simple example of using Oracle JSF 1.2 to specify API to help you better understand how to use it:
1. First, you need to include the JSF library file.You can download the JSF library file from Oracle's official website and add it to your project.
2. Create a new Java class to process the logic of JSF applications.For example, we can create a Java class called "HelloWorldBean", which contains a method called "Message" and a method called "GetMessage".
public class HelloWorldBean {
private String message;
public HelloWorldBean() {
message = "Hello, World!";
}
public String getMessage() {
return message;
}
}
3. In the Faces-config.xml configuration file, register the Java class as the host Bean of JSF.For example:
<managed-bean>
<managed-bean-name>helloWorldBean</managed-bean-name>
<managed-bean-class>com.example.HelloWorldBean</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
4. Create a new JSF page (for example, hello.xhtml) to display the hello world message.In this page, you can use the JSF mark and EL expression to call the method in the Java class.
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html">
<h:head>
<title>Hello World</title>
</h:head>
<h:body>
<h:outputText value="#{helloWorldBean.message}" />
</h:body>
</html>
In the above examples, we created a simple JSF application.When the server starts, the JSF framework will automatically load and manage the hosting bean (such as HelloWorldBean) in the settings in the Faces-config.xml configuration file.Then, when the user visits the Hello.xhtml page, JSF automatically calls the related Java method and return the result to the page.
Summary: This article briefly introduces how to use Oracle JSF 1.2 specification API for development, and provides a simple example to illustrate its usage.I hope this article will be helpful to understand the basic concepts of JSF and API.If you need to learn more about JSF, please refer to the official documentation and other related resources.
