org.apache.jasper.JasperException：無法編譯JSP的類。

Question

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 176 in the jsp file: /encrypted.jsp 
gn cannot be resolved 

173:  <input type="text" name="itt" value="" /> 
174:   </label><br><br><br><br> 
175:   <label><b>Generated Key-</b> 
176:    <input type="text" name="Gnkey" value="<%=gn%>"/> 
177:   </label> 
178: </td> 

的GN變量用於將輸出存儲從功能

<% 
String gn = generateKey(SelectedIndex, key, itt); 
%> 

如何解決這個問題？

Answer 1

放入pageContext

<% 
    pageContext.setAttribute("gn", gn); 
%> 

然後像​​

或

變化訪問

<% 
String gn = generateKey(SelectedIndex, key, itt); 
%> 

到

<!% 
String gn = generateKey(SelectedIndex, key, itt); 
%> 

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另請參見

• why business logic should be moved out of JSP?