我已经编写了一个简单的程序，用于使用data（ArrayList）进行表单提交，以便从表发送到控制器类。

提交表单时，数据始终为空，不确定我在这里做错了什么。

我几乎要花很多时间来确定问题，但运气不好:(

控制器类 （在Post方法中始终为null的地方）

public class AccountContoller {

private ArrayList<AccountwithSelection> allAccountwithSelect = new ArrayList<AccountwithSelection>();
public AccountContoller()
{
    //Written some test data in Array
    AccountwithSelection accountwithSelection1 =  new AccountwithSelection();
    accountwithSelection1.setAccountnumber("Acct1");
    accountwithSelection1.setIlc("ILC1");
    allAccountwithSelect.add(accountwithSelection1);
    AccountwithSelection accountwithSelection2 =  new AccountwithSelection();
    accountwithSelection2.setAccountnumber("Acct2");
    accountwithSelection1.setIlc("ILC2");
    allAccountwithSelect.add(accountwithSelection2);

}


@RequestMapping(value = "/accountload", method = RequestMethod.GET)
   String accountload(Model model) {
      AccountSelectionListWrapper wrapper = new AccountSelectionListWrapper();
      wrapper.setAccountList(allAccountwithSelect);
      model.addAttribute("accountload", wrapper);
      return "accountload";
   }

@RequestMapping(value = "/accountload", method = RequestMethod.POST)
public String addimeiPost(Model model,
        @ModelAttribute("accountload") AccountSelectionListWrapper wrapper,
        HttpServletRequest request) {
     System.out.println(wrapper.getAccountList()); //Always getting null, why ?
    return "accountload";

}

}

类：AccountwithSelection

public class AccountwithSelection {
public String accountnumber, ilc;

public String getAccountnumber() {
    return accountnumber;
}

public void setAccountnumber(String accountnumber) {
    this.accountnumber = accountnumber;
}

public String getIlc() {
    return ilc;
}

public void setIlc(String ilc) {
    this.ilc = ilc;
}

}

WrapperClass- AccountSelectionListWrapper

public class AccountSelectionListWrapper {

public ArrayList<AccountwithSelection> accountList;

public ArrayList<AccountwithSelection> getAccountList() {
    return accountList;
}

public void setAccountList(ArrayList<AccountwithSelection> accountList) {
    this.accountList = accountList;
}

}

HTML表单： （accountload.html）

    <form action="#" th:action="accountload" th:object="${accountload}" method="post">
    <div class="row">
        <div class=form-group-1>
            <input type="submit" value="Send Data" name="action">
        </div>
    </div>
    <table id="mytable" class="table">
        <tbody class="table-tbody" style="width: 90%">
            <tr class="table-head">
                <th>ACCOUNT NUMBER</th>
            </tr>
            <tr class="table-row">
            <tr class="table-row" th:each="account, stat : *{accountList}">
                <td class="table-data" th:text="${account.getAccountnumber()}"
                    th:field="*{accountList[__${stat.index}__].accountnumber}"
                    th:value="${account.getAccountnumber()}"></td>
            </tr>
        </tbody>
    </table>
</form>