如何在Controller中捕获java.lang.NumberFormatException.forInputString异常？

问题描述

 < form：checkbox path =somePath value =2/>危险复选框< br /> 
  

如果用户将输入的值更改为 String value，例如：

 < form：checkbox path =somePathvalue =blah/>危险复选框< br /> 
  

该页面将抛出一个 NumberFormatException 。如何在我的控制器中找到这个并显示有意义的信息？

解决方案

可以使用JSTL的标签：

 < c：catch var =numberFormatException> 
< form：checkbox path =somePathvalue =blah/>危险复选框< br /> 
< / c：catch> 
 
< c：if test =$ {numberFormatException！= null}> 
< p>异常是：$ {numberFormatException}< br /> 
有一个例外：$ {numberFormatException.message}< / p> 
< / c：if> 
  

I have a checkbox in my JSP page that accepts integer values:

<form:checkbox path="somePath" value="2" /> Dangerous Checkbox <br />

If the user changes the value of the input to a String value, e.g.:

<form:checkbox path="somePath" value="blah" /> Dangerous Checkbox <br />

the page will throw a NumberFormatException. How can I catch this in my Controller and show a meaningful message?

解决方案

you can use JSTL's c:catch tag:

<c:catch var ="numberFormatException">
<form:checkbox path="somePath" value="blah" /> Dangerous Checkbox <br />
</c:catch>

<c:if test = "${numberFormatException!= null}">
   <p>The exception is : ${numberFormatException} <br />
   There is an exception: ${numberFormatException.message}</p>
</c:if>

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