How to read environment variables from a JSP.

[AJDulk]

Ebase allows you to read out environment variables that are set-up in the WEB-INF/web.xml file. How do you read those variables out of the file from a JSP file?

[AJDulk]

In the <%@ page ... %> directive, add the following between the quotes defining the import if not already defined:

Code: Select all

javax.naming.Context and javax.naming.InitialContext

or

javax.naming.*

The line should now look something like this:

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<%@ page language="java" import="com.ebasetech.ufs.kernel.*, javax.naming.*"%>

Add the following, adapted to your situation:

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<%!
  // My Variable Declarations.
  String MY_VAR1 = null;
  String MY_VAR2 = null;
  String MY_VAR3 = null;
  String MY_VAR4 = null;
  ...
%>

<%
  // Obtain our environment naming context
  try &#123;
    Context initCtx = new InitialContext&#40;&#41;;
    Context envCtx = &#40;Context&#41; initCtx.lookup&#40;"java&#58;comp/env"&#41;;
    MY_VAR1 = &#40;String&#41; envCtx.lookup&#40;"MY_VAR1"&#41;;
    MY_VAR2 = &#40;String&#41; envCtx.lookup&#40;"MY_VAR2"&#41;;
    MY_VAR3 = &#40;String&#41; envCtx.lookup&#40;"MY_VAR3"&#41;;
    MY_VAR4 = &#40;String&#41; envCtx.lookup&#40;"MY_VAR4"&#41;;
    ...
  &#125; catch &#40;Exception e&#41; &#123;
%>
  Error&#58; <%=e%>
<%
  &#125;
%>

The <%! ... %> block is called a declaration block and is used to define variables and in page functions that can be used within the whole page. It is only necessary to place variables within this block that you are planning to use within a function. In page functions need to be declared in this block. Calls to functions are placed in <% ... %> tags.