Oracle JSF 1.2 specification API implementation in the Java class library
Oracle JSF 1.2 Specification API is part of the Java class library and is used to achieve Javaseerver Faces (JSF) technology.JSF is a component -based Java Web application framework that is used to build a user interface.This article will introduce the implementation of Oracle JSF 1.2 specification API and explain related programming code and configuration.
1. Introduce the JSF library
First, make sure your Java project already contains Oracle JSF 1.2 standard API library.You can introduce the library by adding the following dependencies to the construction file of your project (such as pom.xml):
<dependency>
<groupId>com.oracle</groupId>
<artifactId>jsf</artifactId>
<version>1.2</version>
</dependency>
2. Configure web.xml
In the web.xml file of the project, we will add context parameters and service mapping for JSF configuration.The following is an example configuration:
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<context-param>
<param-name>javax.faces.CONFIG_FILES</param-name>
<param-value>/WEB-INF/faces-config.xml</param-value>
</context-param>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
In the above configuration, we define a context parameter called `javax.faces.faces.project_stage`, set its value to the` Development`.This will set JSF to the development mode for easy debugging and error processing.In addition, we designated the context parameters of `javax.faces.config_files`, which are used to specify the JSF configuration files located in one or more JSF configuration files located in the position of`/web-inf/faces-config.xml`.Finally, we are equipped with a Servlet called "Faces Servlet", which is responsible for handling all requests with `.jsf` as the suffix.
3. Create the JSF page
Next, we can create a JSF page to build a user interface.The JSF page is expanded with `.xhtml`.Here are a example of the JSF page of an example:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<head>
<title>JSF Example</title>
</head>
<body>
<h1>Welcome to JSF Example</h1>
<h:form>
<h:inputText value="#{userBean.name}" />
<h:commandButton value="Submit" action="#{userBean.submit}" />
</h:form>
</body>
</html>
In the above example, we introduced JSF naming space and used the `H` prefix to use components in the JSF tag library.We use the `H: Form` tag package form content, and use the` h: inputtext` component to create a text input box to receive the user's input.`h: CommandButton` Motors are used to create a submission button. When the user clicks the button, the` submit` method in the `userBean` is called.
4. Create Managed Bean
In order to handle user interaction on the JSF page, we need to create a Managed Bean to process the background logic of the page.The following is a sample Managed Bean:
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
@ManagedBean
@SessionScoped
public class UserBean {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String submit() {
// Processing user submission logic
return "success";
}
}
In the above example, we use the `@managedbean` annotation to declare the` userBean` as the managed bean of JSF.`@SessionScoped` Note specifies the scope of the bean as the session level.We created a `name` attribute to store the names entered by the user and provide it with the getter and setter method.The `Submit` method will be called when the user clicks the handling button and processing the logic of the user submit.In this example, the `submit` method just simply returns the` Success "` string.
In this way, we complete the implementation of Oracle JSF 1.2 specification API.By using the JSF label library to build a user interface, and using Managed Bean to handle user interaction in the background, we can create a powerful Java Web application.I hope this article will help you learn JSF technology.
