Basic usage of Java Portlet API V3.0 framework
Basic usage of Java Portlet API V3.0 framework
The Java Portlet API is a standard API for constructing insertable web components.It provides a method of developing an enterprise -level portal application based on plug -in architecture.This article will introduce the basic usage of the Java Portlet API V3.0 framework and provide some Java code examples.
1. Environmental construction and configuration
1. Make sure that the Java development environment (JDK) and Java application servers (such as Apache Tomcat).
2. Download and configure the Java Portlet API V3.0 development package and deploy it to the Java application server.
2. Create a simple Portlet application
Below is a step to create a simple portlet application.
1. Create a Java class to implement javax.portlet.portletlet interface.
import javax.portlet.GenericPortlet;
import javax.portlet.PortletException;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import javax.portlet.PortletRequestDispatcher;
import java.io.IOException;
public class MyPortlet extends GenericPortlet {
public void doView(RenderRequest request, RenderResponse response)
throws PortletException, IOException {
PortletRequestDispatcher dispatcher =
getPortletContext().getRequestDispatcher("/WEB-INF/views/myView.jsp");
dispatcher.include(request, response);
}
}
2. Create a JSP view (such as MyView.jsp) to present the content of Portlet.
jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>My Portlet</title>
</head>
<body>
<h1>Hello, Portlet!</h1>
</body>
</html>
3. Deployment and testing Portlet application
1. Pack the written Portlet application into a war file.
2. Deploy the War file to the WebApps directory in the Java application server.
3. Start the application server and access the URL of the Portlet application, which is usually shape.
4. Advanced features using the Portlet framework
In addition to the basic Portlet development, the Java Portlet API V3.0 also provides many advanced functions, such as incident processing, resource management, and authority control.The following is an example of using events and resource management:
import javax.portlet.Event;
import javax.portlet.EventRequest;
import javax.portlet.EventResponse;
import javax.portlet.GenericPortlet;
import javax.portlet.PortletException;
import javax.portlet.ProcessEvent;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
public class MyAdvancedPortlet extends GenericPortlet {
public void doView(RenderRequest request, RenderResponse response)
throws PortletException, IOException {
// ...
}
@ProcessEvent(qname="{http://example.com/events}myEvent")
public void processMyEvent(EventRequest request, EventResponse response)
throws PortletException, IOException {
Event event = request.getEvent();
// Treatment event
}
}
import javax.portlet.EventPortlet;
import javax.portlet.EventRequest;
import javax.portlet.EventResponse;
import javax.portlet.GenericEventPortlet;
import javax.portlet.PortletException;
public class MyEventPortlet extends GenericEventPortlet {
protected void doEvent(EventRequest request, EventResponse response)
throws PortletException, IOException {
// Treatment event
}
}
For more Java Portlet API V3.0, please refer to the official documentation.
