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我想使用ModelAttribute来绑定列表。该列表包含Transaction类型的对象,每个对象都包含transactionid(int类型)。这是我的控制器代码:ModelAttribute在春天不能使用列表
@RequestMapping(value = "/approvecreditdebit.do", method = RequestMethod.POST)
public ModelAndView doActions(HttpServletRequest request,
@ModelAttribute("clc") Clc transactionList, BindingResult result,
ModelMap model) {
/*
* switch (action) { case "approve":
*/
System.out.println("Obj = " + transactionList.getClass());
System.out.println("Val = " + transactionList.getTransactionList());
Users users = new Users();
return new ModelAndView("internal","internal",users);
}
这是我的JSP代码:
<form:form action="approvecreditdebit.do" method="POST"
modelAttribute="clc">
<table border="1">
<tr>
<th>no</th>
<th>ID</th>
</tr>
<c:forEach items="${clc.transactionList}"
var="transaction" varStatus="status">
<tr>
<td>${status.index}</td>
<td><input name = "transaction[${status.index}].transactionId"
value="${transaction.transactionId}" /></td>
</tr>
</c:forEach>
</table>
<br>
<br>
<center>
<input type="submit" value="approve" />
</center>
</form:form>
这是CLC等级:
public class Clc{
private List<Transaction> transactionList;
public List<Transaction> getTransactionList() {
return transactionList;
}
public void setTransactionList(List<Transaction> transactionList) {
this.transactionList = transactionList;
}
}
transactionList的价值没有被设置为值从表单中收到。我收到以下错误:
Request processing failed; nested exception is java.lang.NullPointerException
我试图寻找对谷歌的解决方案,并得到了很多来自计算器的解决方案,但他们都不工作。
太棒了!我不知道它是如何工作的,因为我之前尝试过使用form:input。很多解决方案都表明这一点。但是名单仍然是空的。唯一的区别在于forEach变量的顺序。我不明白这会如何影响结果。非常感谢! – 2014-11-05 05:55:34