📄 ex4_5.txt

📁 j2ee core design patterns
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Example 4.5 JSP with Scriptlet Code

<html>
<head><title>Employee List</title></head>
<body>
<%-- Display All employees belonging to a department and earning at most the given salary --%>

<%   
    
    // Get the department for which the employees are
    // to be listed
    String deptidStr = request.getParameter( 
        Constants.REQ_DEPTID);

    // Get the max salary constraint
    String salaryStr = request.getParameter( 
        Constants.REQ_SALARY);

    // validate parameters

    // if salary or department not specified, go to
    // error page
    if ( (deptidStr == null) || (salaryStr == null ) )
    { 
       request.setAttribute(Constants.ATTR_MESSAGE, 
        "Insufficient query parameters specified" + 
        "(Department and Salary)");
       request.getRequestDispatcher("/error.jsp").
         forward(request, response);
    }

    // convert to numerics
    int deptid = 0;
    float salary = 0;
    try
    {
        deptid = Integer.parseInt(deptidStr);
        salary = Float.parseFloat(salaryStr);
    }
    catch(NumberFormatException e)
    {   
       request.setAttribute(Constants.ATTR_MESSAGE, 
          "Invalid Search Values" + 
          "(department id and salary )");
       request.getRequestDispatcher("/error.jsp").
          forward(request, response);        

    }

    // check if they within legal limits
    if ( salary < 0  )
    {
      request.setAttribute(Constants.ATTR_MESSAGE, 
        "Invalid Search Values" + 
        "(department id and salary )");
      request.getRequestDispatcher("/error.jsp").
          forward(request, response);
    }
    
%>

<h3><center> List of employees in department # <%=deptid%>
    earning at most <%= salary %>. </h3>

<%
    Iterator employees = new EmployeeDelegate().
         getEmployees(deptid);
%>

<table border="1" >
    <tr>
        <th> First Name </th>
        <th> Last Name </th>
        <th> Designation </th>
        <th> Employee Id </th>
        <th> Tax Deductibles </th>
        <th> Performance Remarks </th>
        <th> Yearly Salary</th>
    </tr>
<%    
    while ( employees.hasNext() )
    {
        EmployeeVO employee = (EmployeeVO) 
              employees.next();

        // display only if search criteria is met
        if ( employee.getYearlySalary() <= salary )
        {
%>
        <tr>
          <td> <%=employee.getFirstName()%></td>

          <td> <%=employee.getLastName()%></td>
          <td> <%=employee.getDesignation()%></td>
          <td> <%=employee.getId()%></td>
          <td> <%=employee.getNoOfDeductibles()%></td>
          <td> <%=employee.getPerformanceRemarks()%>
                </td>
          <td> <%=employee.getYearlySalary()%></td>
        </tr>
<%  
        }
    }
%>
</table>

<%@ include file="/jsp/trace.jsp" %>
<P> <B>Business logic and presentation formatting are
           intermingled within this JSP view. </B>

</body>
</html>
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