如何添加一個到整數上提交按鈕到jsp字符串？

Question

<input type="text" name="integer" value="0"/> 
<input type="submit" value="add one" /> 

---

<% 
String integer = request.getParameter("integer"); 
%> 

<% 
int x = 0; 
try { x = Integer.parseInt("integer"); } 
catch (Exception e) { x = 0; } 
%> 

我怎麼能每次我打提交按鈕時添加一個整數？

Answer 1

<% 
String integer = request.getParameter("integer"); 
int x = (integer == null ? 0 : (Integer.parseInt(integer) + 1)); 
%> 

<input type="text" name="integer" value="<%=x%>"/> 
<input type="submit" value="add one" />