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<form-property name="productID" type="java.lang.Integer"></form-property>
<form action="step3.do" method="post">
<input type="checkbox" name="productID" value="1">产品1<br>
<input type="checkbox" name="productID" value="2">产品2<br>
<input type="checkbox" name="productID" value="3">产品3<br>
<input type="checkbox" name="productID" value="4">产品4<br>
<input type="checkbox" name="productID" value="5">产品5<br>
<input type="submit" value="下一步"/>
</form>
DynaActionForm daf=(DynaActionForm)form;
System.out.println(daf.get("productID"));
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>