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"Strutting your Stuff"
Vol. 6, Issue 11, p. 42
Listing 1: The additions to WEB.XML required to use Struts
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>
org.apache.struts.action.ActionServlet
</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>
/WEB-INF/struts-config.xml
</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>2</param-value>
</init-param>
<init-param>
<param-name>mapping</param-name>
<param-value>
org.apache.struts.action.RequestActionMapping
</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<taglib>
<taglib-uri>
/WEB-INF/struts-bean.tld
</taglib-uri>
<taglib-location>
/WEB-INF/struts-bean.tld
</taglib-location>
</taglib>
<taglib>
<taglib-uri>
/WEB-INF/struts-html.tld
</taglib-uri>
<taglib-location>
/WEB-INF/struts-html.tld
</taglib-location>
</taglib>
<taglib>
<taglib-uri>
/WEB-INF/struts-logic.tld
</taglib-uri>
<taglib-location>
/WEB-INF/struts-logic.tld
</taglib-location>
</taglib>
<taglib>
<taglib-uri>
/WEB-INF/struts-template.tld
</taglib-uri>
<taglib-location>
/WEB-INF/struts-template.tld
</taglib-location>
</taglib>
Listing 2: A simple STRUTS-CONFIG.XML document
<struts-config>
<form-beans>
<form-bean
name="addItem"
type="schedule.ScheduleItem" />
</form-beans>
<action-mappings>
<action
path="/sched"
type="schedule.ViewScheduleAction" />
<action
path="/schedEntry"
type="schedule.ScheduleEntryAction" />
<action
path="/add"
type="schedule.AddToScheduleAction"
name="addItem"
input="/ScheduleEntryView.jsp"
validate="true" />
</action-mappings>
</struts-config>
Listing 3: A small Action subclass
package schedule;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.*;
public class ViewScheduleAction extends Action {
public ViewScheduleAction() {
}
public ActionForward perform(
<x-tab></x-tab> ActionMapping mapping, ActionForm form,
<x-tab></x-tab> HttpServletRequest request,
<x-tab></x-tab> HttpServletResponse response)
<x-tab></x-tab>throws
java.io.IOException,
<x-tab></x-tab>javax.servlet.ServletException
{
ScheduleBean
sb = new ScheduleBean();
sb.populate();
request.setAttribute("scheduleBean",
sb);
return
new ActionForward("/ScheduleView.jsp");
}
}
Listing 4: The View JSP for the schedule application
<p> <HTML>
<HEAD>
<%@ taglib uri="/WEB-INF/struts-logic.tld"
prefix="logic" %>
<p> <jsp:useBean id="scheduleBean" scope="request"
class="schedule.ScheduleBean"
/>
<jsp:useBean id="scheduleItem" scope="page"
class="schedule.ScheduleItem"
/>
<TITLE>
Schedule View
</TITLE>
</HEAD>
<BODY>
<H1>
Schedule
</H1>
<p> <table border="2">
<tr bgcolor="green">
<th>Start
Date</th>
<th>Duration</th>
<th>Text</th>
<th>Event
Type</th>
</tr>
<p> <logic:iterate id="schedItem"
type="schedule.ScheduleItem"
collection="<%= scheduleBean.getList()
%>">
<tr>
<td><%=
schedItem.getStart() %></td>
<td><%=
schedItem.getDuration() %></td>
<td><%=
schedItem.getText() %></td>
<td><%=
schedItem.getEventType() %></td>
</tr>
</logic:iterate>
</table>
<p>
<p>
<a href="schedEntry.do"> Add New Schedule Item</a><p>
</BODY>
</HTML>
Listing 5: An HTML form using the Struts HTML custom tags.<p>
<%@ taglib uri="/WEB-INF/struts-html.tld"
prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld"
prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts.tld"
prefix="struts" %>
<jsp:useBean id="scheduleItem" scope="request"
class="schedule.ScheduleItem" />
<jsp:useBean id="scheduleBean" scope="page"
class="schedule.ScheduleBean" />
<% pageContext.setAttribute("eventTypes",
<x-tab></x-tab>scheduleBean.getEventTypes()); %>
<p> <HEAD>
<TITLE>
ScheduleEntryView
</TITLE>
</HEAD>
<BODY>
<H1>
Add Schedule Item
</H1>
<hr>
<html:errors/>
<html:form action="add.do">
<table border="0" width="30%" align="left">
<tr>
<th align="right">
<struts:message
key="prompt.duration"/>
</th>
<td align="left">
<html:text
property="duration"
size="16"/>
</td>
</tr>
<tr>
<th align="right">
<struts:message
key="prompt.eventType"/>
</th>
<td align="left">
<html:select
property="eventType">
<html:options
collection="eventTypes"
property="value"
labelProperty="label"/>
</html:select>
<p> </td>
</tr>
<tr>
<th align="right">
<struts:message
key="prompt.start"/>
</th>
<td align="left">
<html:text
property="start"
size="16"/>
</td>
</tr>
<tr>
<th align="right">
<struts:message
key="prompt.text"/>
</th>
<td align="left">
<html:text
property="text"
size="16"/>
</td>
</tr>
<p> <tr>
<td align="right">
<struts:submit>
<bean:message
key="button.submit"/>
</struts:submit>
</td>
<td align="right">
<html:reset>
<bean:message
key="button.reset"/>
</html:reset>
</td>
</tr>
</table>
</html:form>
<p>
</BODY>
</HTML>
Listing 6: The validation method for the ScheduleItem form bean
public ActionErrors validate(
ActionMapping actionMapping,
HttpServletRequest request) {
ActionErrors ae = new ActionErrors();
if (duration < 0 || duration > 31) {
ae.add("duration", new ActionError(
"error.invalid.duration", "8"));
}
if (text == null || text.length() < 1) {
ae.add("event text",
new ActionError("error.no.text"));
}
return ae;
}
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