Oracle JSF 1.2 specification API in the application of Java class libraries
Application of using Oracle JSF 1.2 specification API in the Java class library
Overview
Javaseerver Faces (JSF) is a Java specification for building a web user interface.Oracle JSF 1.2 Specification API provides a set of categories and methods to create and manage the web application interface.In this article, we will explore how to use Oracle JSF 1.2 to specify APIs to build dynamic and interactive web applications.
Java class library and related configuration
Before starting to use Oracle JSF 1.2 specification API, we need to ensure that the following components have been correctly configured:
1. Java Development Tool Pack (JDK): Make sure that the correct JDK version has been installed and configured.
2. Java Servlet container: JSF application runs in the Servlet container.Common containers are Apache Tomcat and Oracle Glassfish.
3. JSF library: In order to use Oracle JSF 1.2 to specify API, we need to add the JSF library to the project path.It can be achieved by adding related dependencies in the construction file (such as pom.xml).
Build the JSF page
Once the environment is configured, we can start using Oracle JSF 1.2 to specify APIs to build the JSF page.The following is a simple example, showing how to create a JSF page containing input fields, buttons, and output fields::
<!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 Page </Title>
</head>
<body>
<h:form>
<h:inputText value="#{student.name}" />
<h:commandButton value="提交" action="#{student.processForm}" />
</h:form>
<h:outputText value="欢迎，#{student.name}" rendered="#{student.showWelcomeMessage}" />
</body>
</html>
In the above example, we use the `H: Form` element to create a form containing the input field and button.`h: InputText` is used to create an input text field.These elements use the attributes and methods in the back -end Java Bean to use Exposition.
In our example, `#{student.name}` binds the value of the input text field, which will be set in the `name` attribute in the` Student` Java Bean.When the button is clicked, the method of `Student.Processform` will be called.
`h: outputText` is used to display an output field, which shows a welcome message.Rendered attributes are set to `#{Student.showwelComemessage}`, which means that when the attribute of the `ShowwelComemessage` is true, the welcome message will be displayed.
Create a back -end java bean
Next, we need to create a back -end Java Bean to handle the movements and data in the JSF page.The following is an example:
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
@ManagedBean
@RequestScoped
public class Student {
private String name;
private boolean showWelcomeMessage;
public void processForm() {
showWelcomeMessage = true;
}
// Getters and setters for name and showWelcomeMessage
}
In the above examples, we used the `@managedbean` and@requestscoped` to declare the Java class as the bean managed by JSF.The attributes of `name` and` showwelcomemEssage` are used to maintain the value of the input field and the state of displaying welcome messages.
The method of `procesForm` is quoted by the` ACTION` attributes of the element of the element, which is called when the button is clicked.In this method, we set the `ShowwelComemessage` property to` True` to display welcome news on the page.
Start the JSF application
Once we have completed the creation of the JSF page and back -end Java Bean, we can deploy and start applications in the Servlet container.The following is a simple example to illustrate how to use Apache Tomcat to start the JSF application:
1. Copy the constructed project war file to the webapps directory of Tomcat.
2. Start the Tomcat server.
3. Open the web browser and access the `http: // localhost: 8080/yourawp` (where` youRapp` is the context path for your application application).
By following the above steps, you should be able to see the JSF page in the web browser and be able to input and submit operations.
in conclusion
In this article, we briefly introduced how to use Oracle JSF 1.2 to specify APIs to build dynamic and interactive web applications.We have seen how to create the JSF page and how to use the back -end Java Bean to handle movement and data.By correcting the Java class library and related components, and referring to the example code and configuration, you should be able to successfully build and start your own JSF application.
