Thymeleaf 表单使用 ArrayList 对象提交

Posted 2023-02-26

【中文标题】Thymeleaf 表单使用 ArrayList 对象提交

【英文标题】：Thymeleaf form submit with ArrayList Object

【发布时间】：2019-11-28 20:07:09

【问题描述】：

我编写了一个简单的表单提交程序，将数据（ArrayList）从表发送到控制器类。

提交表单时，数据总是为空，不知道我在这里做错了什么。

我几乎花了很多时间来确定问题没有运气:(

Controller 类（我在 Post 方法中总是得到 null）

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>

【参考方案1】：

<td /> 元素未与表单一起提交。您需要使用某种输入。它应该看起来像这样：

<td class="table-data">
  <input type="text" th:field="*accountList[__$stat.index__].accountnumber" />
</td>

或者如果您想提交而不看到字段可编辑，类似这样

<td class="table-data">
  <span th:text="$account.accountnumber" />
  <input type="hidden" th:field="*accountList[__$stat.index__].accountnumber" />
</td>