This is a migration of the same program from Struts 1 to Struts 2. It looks simple but this technique may be used to populate DDLBs in real applications. A reservation about this is: if the amount of the material is too much it causes substantial delays in the startup of the program.
Some credit goes to Sedat Ergin and RoseIndia whose works I changed and took out bits and pieces.
Kind regards.
Ali Riza SARAL
Note: I left intentionally some debugging lines to give some hints.
web.xml
-------
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Struts Blank</display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
</web-app>
index.html
-----------
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<META HTTP-EQUIV="Refresh" CONTENT="0;URL=ars/setList.action">
</head>
<body>
<p>Loading ...</p>
</body>
</html>
struts.xml
----------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="false" />
<include file="ars.xml"/>
<!-- Add packages here -->
</struts>
ars.xml
-------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="ars" namespace="/ars" extends="struts-default">
<action name="setList" class="ars.SetListAction">
<result name="success">/listProcess.jsp</result>
</action>
<action name="viewDetail" class="ars.ViewDetailAction">
<result name="success">/viewDetailProcess.jsp</result>
</action>
</package>
</struts>
SetListAction.java
------------------
package ars;
import com.opensymphony.xwork2.ActionContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.opensymphony.xwork2.ActionSupport;
import java.util.*;
import javax.servlet.http.HttpSession;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
public final class SetListAction extends ActionSupport implements
ServletRequestAware,ServletResponseAware {
private HttpServletRequest request;
private HttpServletResponse response;
private List list;
public SetListAction() {
request = getServletRequest();
}
public String execute() throws Exception {
System.out.println("ARSSSss SetListAction.execute()");
System.out.println("ARSSSss ContextPath="+request.getContextPath());
HttpSession session = request.getSession();
System.out.println("ARSSSss ServletContext="+session.getServletContext());
list = new ArrayList();
list.add("Fruits");
list.add("Apple");
list.add("Mango");
list.add("Orange");
list.add("Pine Apple");
session.setAttribute("baseList",list);
System.out.println("ARSSSsss baseList="+session.getAttribute("baseList").toString());
// ServletActionContext.getRequest().getSession().setAttribute("baseList", list);
//Map session1 = (Map) ActionContext.getContext().get("session");
//session1.put("baseList", list);
return SUCCESS ;
}
public List getList(){
return list;
}
public void setServletRequest(HttpServletRequest request){
this.request = request;
}
public HttpServletRequest getServletRequest(){
return request;
}
public void setServletResponse(HttpServletResponse response){
this.response = response;
}
public HttpServletResponse getServletResponse(){
return response;
}
}
listProcess.jsp
---------------
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Iterator</title>
</head>
<body>
<table border="2px" bgcolor="#CCCC99" cellspacing="1">
<s:iterator value="#session.baseList" id="iteratorItem">
<tr>
<td>Item Value:</td>
<td>
<s:property value="iteratorItem"/>
</td>
<td>
<s:url var="url" action="/viewDetail">
<s:param name="iteratorItem" value="iteratorItem"/>
</s:url>
<s:a href="%{url}">View</s:a>
</td>
</tr>
</s:iterator>
</table>
</body>
</html>
ViewDetailAction.java
---------------------
package ars;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.opensymphony.xwork2.ActionSupport;
import javax.servlet.http.HttpSession;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
public final class ViewDetailAction extends ActionSupport implements
ServletRequestAware, ServletResponseAware {
private HttpServletRequest request;
private HttpServletResponse response;
public ViewDetailAction() {
request = getServletRequest();
}
public String execute() throws Exception {
System.out.println("ARSSSsss ViewDetailAction java");
HttpSession session = request.getSession();
String detailInfo = request.getParameter("iteratorItem");
System.out.println("ARSSSsss detailInfo=" + detailInfo);
System.out.println("ARSSSsss request " + request.getParameterNames());
session.setAttribute("baseDetail", detailInfo);
return SUCCESS;
}
public void setServletRequest(HttpServletRequest request) {
this.request = request;
}
public HttpServletRequest getServletRequest() {
return request;
}
public void setServletResponse(HttpServletResponse response) {
this.response = response;
}
public HttpServletResponse getServletResponse() {
return response;
}
}
viewDetailProcess.jsp
---------------------
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Detail</title>
</head>
<body>
<s:text name="#session.baseDetail" />
</body>
</html>
