Solve the problem of JSP getting string concatenation of value in Sesion domain

May 22, 2015 weather Overcast
Problem Description:
Background code:

//caseId为字符串类型Struts2Utils.getRequest().getSession().setAttribute"idPhoto", idPhoto);

JSP gets Idphoto Gets the value in the Session field
Error wording:

${param.search_caseId+"idPhoto"}

Correct wording one:

<c:setvar="idPhotoName"value="${param.search_caseId }idPhoto" scope="page" /><c:outvalue="${session[idPhotoName]}"></c:out>

Two correct wording:

<%    String caseId = request.getParameter("search_caseId");    String idPhotol = caseId + "idPhoto";    //当然，也可以放在request等其它的域中，在[]中取的idPhotol可以忽略域    pageContext.setAttribute("idPhotol", idPhotol);%><c:out value="${session[idPhotol]}"></c:out>

Solve the problem of JSP getting string concatenation of value in Sesion domain