JSP Introduction
Simple JSP(Example-1)
JSP Err.Pag.(Example-2)
JavaBeans in JSP
JavaBeans(Example-3)
JSP Custom Tags
CustomTag(Example-4)
Design Patterns
Design Patt.(Example-5)
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Using JavaBeans in JSP
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Introduction
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JAVABEANS components are Java classes that can be easily reused and composed together into applications. Any Java class that follows certain design conventions can be a JavaBeans component.
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Including Bean Reference
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The following code snippet shows the syntax of the <jsp:useBean> action tag:
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<jsp:useBean id="Bean Name" scope="ScopeName" class="class name />
A JavaBean can exist in the following scopes:-
page: Specifies that the JavaBean object is available for the current page only. This is the default scope of a JavaBean.
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<jsp:useBean id="option_bean" scope ="page" class="test.OptionBean"/>
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test.OptionBean option_bean=new test.OptionBean();
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request: Specifies that the JavaBean object is available for the current request.
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<jsp:useBean id="option_bean" scope ="request" class="test.OptionBean"/>
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test.OptionBean option_bean=new test.OptionBean();
request.setAttribute("option_bean ", option_bean);
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session: Specifies that the JavaBean object is available for the current session only.
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<jsp:useBean id="option_bean" scope ="session" class="test.OptionBean"/>
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HttpSession session = request.getSession(true);
test.OptionBean option_bean=new test.OptionBean();
session.setAttribute("option_bean ", option_bean);
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application: Specifies that the JavaBean object is available for the entire Web application.
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<jsp:useBean id="option_bean" scope ="application" class="test.OptionBean" />
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test.OptionBean option_bean=new test.OptionBean();
getServletContext().setAttribute("option_bean ", option_bean);
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Setting Beans Properties
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- The following syntax shows how to set a property of a JavaBean using <jsp:setProperty> tag:
<jsp:setProperty name="beanName" property=" propertyName">
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Reading Bean Properties
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- The following syntax shows how to get the JavaBean property using <jsp:getProperty> tag:
<jsp:getProperty name="beanName" property="propertyName" />
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