將IF語句添加到JSP

Question

我正在嘗試將if語句添加到以下代碼，但它會一直拋出錯誤。我究竟做錯了什麼？

 <% 
     int countOnRows = 0; 
     int i; 
     countOnRows= Integer.parseInt(formFields.getValue("broughtBack")); 
     if (countOnRows = 0) { 
     <h2>No data available - check back later </h2> 
     } 

     for(i=1; i<=countOnRows; i++) 
     { %> 
       <div class="a_report"> 

       <h2>Dealer Sales Report</h2> 

       <h3>Sales Results as of July 2014 - <%=formFields.getValue("dealerName"+i)%>, Dealer <span class="dlr_info"># <%=formFields.getValue("dealerNo"+i)%></span></h3> 

       <div class="body_copy"><span class="print">[ <a href="javascript:window.print()">print this report</a> ]</span> 
    : 
    : table with table data in report here 
    : 

    <% } %> 

      </div> 

Answer 1

它不是Java代碼：

if (countOnRows = 0) { 
    <h2>No data available - check back later </h2> 
} 

改變成：

if (countOnRows == 0) { 
    %> <h2>No data available - check back later </h2> <% 
} 

我也改變if (countOnRows = 0)到if (countOnRows == 0)

你應該閱讀有關使用JSTL和EL，它比使用Java更好JSP頁面內的代碼。