Hi, I think I have some problem on understanding certain concept in
struts, and wondering if anyone can help me. Basically I have a jsp
page, an action and an actionform, which load the data from the
database, and display on the jsp. There is a part which use the
<display:*> tags, which display a table. I have trouble keeping the
data inside the form to persist, and if I click on the sorting link on
the UserGroup table, I lost the request, and therefore the
UserDetailForm instance is lost, and the page report error because it
cannot find any data (as you can see, I stop the page from loading the
data again and resetting my input in the form). I am very unsure if my
structure is correct, please point as many bad things as possible, this
would be a great help. I have included a series of code here for
reference. Although my code does not work properly, but I feel that
there are things that could be of great help to some people (e.g.
displaying hashmap easily), and I would like to share these and possible
help others. Thanks
################################ UserDetail.jsp
##############################################
<!�Xsome tag lib ��
<html:form action="/UserDetail">
<html:hidden property = "IUserId" />
Username: <html:text property = "SUserName"/><BR>
Created Date: <bean:write name="UserDetailForm" property="DCreatedDate"
scope="request"/> <BR>
Email: <html:text property = "SEmail"/><BR>
Password: <html:password property = "SPassword"/><BR>
�K some other fields
<html:hidden property="forward" value="error"/>
<html:submit onclick="set('update');">UPDATE</html:submit>
<html:submit onclick="set('delete');">DELETE</html:submit>
�K.some other forwards
<hr>GROUPS<hr>
<display:table width="60%" name="UserDetailForm" property="hmUserGroups"
scope="request">
<display:column property="key" title="Name" sort="true"/>
<display:column property="value" title="value" />
</display:table>
</html:form>
</body>
<Script language="JavaScript">
function set(target) {
document.forms[0].forward.value=target;
}
</Script>
</html>
################################ UserDetailForm
##############################################
public class UserDetailAction extends Action{
public ActionForward perform(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
//load Detail form data
UserDetailForm udf = (UserDetailForm)form;
HashMap hmUserGroups = new HashMap();
DaoManager daoManager = (DaoManager)
servlet.getServletContext().getAttribute(Constants.DATABASE_KEY );
UserFacade fd = new UserFacade();
fd.Init(daoManager);
//create a user object for storing current user data
User user = new User();
try {
user = fd.getUser(Integer.parseInt(udf.getIUserId()));
hmUserGroups = fd.getUserGroups(user.getIUserId());
udf.setHmUserGroups(hmUserGroups);
}
catch (Exception e) {
System.out.println(e);
}
//only reset all the user detail if UserId =null from the
UserDetail_b.jsp (User Detail is not loaded yet)
//or if forward is reset
String forwardRequest="";
if(request.getParameter("forward")!=null)
forwardRequest = request.getParameter("forward");
else
forwardRequest = "requestNull";
if(udf.getIUserId() == null ||
forwardRequest.equals("requestNull") || forwardRequest.equals("reset"))
{
udf.setDCreatedDate(Util.Date2String(user.getDCreatedDate(),
"1970-01-01"));
udf.setSEmail(user.getSEmail());
udf.setSPassword(user.getSPassword());
udf.setSUserName(user.getSUserName());
}
request.setAttribute("currentUser", user);
//check if forward is null (first time load)
if(request.getParameter("forward")!=null)
return
(mapping.findForward(request.getParameter("forward")));
else
//first time load, load all data
return (mapping.findForward("reset"));
}
}
################################ UserDetailForm
##############################################
public class UserDetailForm extends ActionForm{
private String sEmail;
private String sUserName;
private String sPassword;
private String dCreatedDate;
private HashMap hmUserGroups;
public String getDCreatedDate() {
return dCreatedDate;
}
public void setDCreatedDate(String dCreatedDate) {
this.dCreatedDate = dCreatedDate;
}
public java.lang.String getSEmail() {
return sEmail;
}
public void setSEmail(java.lang.String sEmail) {
this.sEmail = sEmail;
}
public java.lang.String getSPassword() {
return sPassword;
}
setSPassword(java.lang.String sPassword) {
this.sPassword = sPassword;
}
public java.lang.String getSUserName() {
return sUserName;
}
public void setSUserName(java.lang.String sUserName) {
this.sUserName = sUserName;
}
public String getIDeletedUser() {
return convertUserId(iDeletedUser);
}
/** Setter for property iDeletedUser.
* @param iDeletedUser New value of property iDeletedUser.
*
*/
public void setIDeletedUser(String iDeletedUser) {
this.iDeletedUser = iDeletedUser;
}
public HashMap getHmUserGroups() {
return hmUserGroups;
}
public void setHmUserGroups(HashMap hmUserGroups) {
this.hmUserGroups = hmUserGroups;
}
public String convertUserId(String sUserId) {
if(sUserId.equals("0"))
return "<Not Available>";
else {
HashMap hm =
(HashMap)servlet.getServletContext().getAttribute("hmUser");
if(!hm.containsKey(new Integer(Integer.parseInt(sUserId))))
return "<Invalid User ID>";
else
return (String)hm.get(new
Integer(Integer.parseInt(sUserId)));
}
}
}
################################################### struts-config.xml
##############################################################
<form-bean name="UserDetailForm"
type="com.apps.crm.web.form.UserDetailForm" />
<action path="/UserDetail"
type="com.apps.crm.web.actions.UserDetailAction" name="UserDetailForm"
validate="false" input="UserDetail" scope="request" unknown="false">
<forward name="cancel" redirect="false" path="/UserList.do" />
<forward name="update" path="/UserUpdate.do" redirect="false" />
<forward name="delete" path="/UserDelete.do" redirect="false" />
<forward name="reset" path="/UserDetail.jsp" redirect="false" />
</action>
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