Struts2 INPUT 结果：它是如何工作的？如何处理转换/验证错误？

主要问题

工作流程应该是这样的：如果输入的是不是数字的String，首先要通过异常拦截器，通过param拦截器时，转换为int类型时，使用Integer.parseIntand an会发生异常；不应该将该异常（即NumberFormatException）推入 Value Stack 吗？NumberFormatException即使不应打印结果，为什么它不显示和显示结果？

副题

每当我在表单中添加一个字母表时，它就会变成零...？为什么这样 ？

索引.jsp

<%@ taglib uri="/struts-tags" prefix="s"%>
<s:form action="divide">
    <s:textfield name="number1" label="number1"/>
    <s:textfield name="number2" label="number2"/>
    <s:submit value="divide"/>
</s:form>

除法.java

package actions;

public class divide {
    int number1,number2,result;
    public String execute() throws Exception
    {
        result=number1/number2;
        return "success";
    }
    public int getNumber1() {
        return number1;
    }
    public void setNumber1(int number1) {
        this.number1 = number1;
    }
    public int getNumber2() {
        return number2;
    }
    public void setNumber2(int number2) {
        this.number2 = number2;
    }
    public int getResult() {
        return result;
    }


}

结果.jsp

<%@taglib uri="/struts-tags" prefix="s" %>
<b>
    the result of division is
    <s:property value="result"/>
</b>
<jsp:include page="index.jsp"></jsp:include>

处理程序jsp

<%@taglib uri="/struts-tags" prefix="s"%>
<b>
    following exception occured during the processing
    <s:property value="exception"/>
</b>
<jsp:include page="index.jsp"/>

struts.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC 
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
    <struts>
        <package name="yo" extends="struts-default">
            <action name="divide" class="actions.divide">
                <exception-mapping result="error" exception="Exception"/>
                <result name="success">/result.jsp</result>
                <result name="error">/handler.jsp</result>
            </action>
        </package>
    </struts>