jsp
Use Bean in JSP Page
With this example we are going to demonstrate how to use a Bean in a JSP page. JavaServer Pages (JSP) is a server-side programming technology that enables the creation of dynamic, platform-independent method for building Web-based applications. JSP have access to the entire family of Java APIs, including the JDBC API to access enterprise databases. In short, to use a Bean in a JSP page you should:
- Create a Java Bean. The Java Bean is a specially constructed Java class that provides a default, no-argument constructor, implements the Serializable interface and it has getter and setter methods for its properties.
- Create a jsp page, using the
<%code fragment%>scriptlet. It can contain any number of JAVA language statements, variable or method declarations, or expressions that are valid in the page scripting language. - Use the
useBeanaction to declare the JavaBean for use in the JSP page. Once declared, the bean becomes a scripting variable that can be accessed by both scripting elements and other custom tags used in the JSP. - Use the
getPropertyaction to access get methods andsetPropertyaction to access set methods of the bean.
Let’s take a look at the code snippets of a sample Bean and a JSP page that uses it, below:
SampleBean.java
package com.javacodegeeks.snippets.enterprise;import java.util.Date;public class SampleBean {private String param1;private Date param2 = new Date();public String getParam1() {return param1;}public void setParam1(String param1) {this.param1 = param1;}public Date getParam2() {return param2;}public void setParam2(Date param2) {this.param2 = param2;}@Overridepublic String toString() {return "SampleBean [param1=" + param1 + ", param2=" + param2 + "]";}}UseBean.jsp
<%@ page language="java" contentType="text/html;charset=UTF-8" %><%@ page import="com.javacodegeeks.snippets.enterprise.SampleBean"%><html><head><title>Java Code Geeks Snippets - Use a Bean in JSP Page</title></head><body><jsp:useBean scope="session"> <%-- intialize bean properties --%> <jsp:setProperty name="sampleBean" property="param1" value="value1" /></jsp:useBean>Sample Bean: <%= sampleBean %>param1: <jsp:getProperty name="sampleBean" property="param1" />param2: <jsp:getProperty name="sampleBean" property="param2" /></body>
URL:
http://myhost:8080/jcgsnippets/UseBean.jspOutput:
Sample Bean: SampleBean [param1=value1, param2=Thu Nov 17 21:28:03 EET 2011]param1: value1 param2: Thu Nov 17 21:28:03 EET 2011
This was an example of how to use a Bean in a JSP page.
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Byron Kiourtzoglou
Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor atJava Code Geeks.
