将jsp页面的<s:iterator>的数据返回到action

jsp：

<form method="post" id="createTable">
  <table width="98%" border="0" cellspacing="0" cellpadding="0" align="center">
    <tr>
      <td height="10"></td>
    </tr>
    <tr id="tabtxt1" >
      <td valign="top" align="center"><table width="100%" border="0" cellspacing="0" cellpadding="0">
      <tr><td>&nbsp;&nbsp;&nbsp;&nbsp;</td></tr>
       <tr>
          <td height="24">
            <label style="margin-left:50px; font-size:20px;">表名：</label>
            <input name="createTable.tableComments" type="text" class="input96 required" id="textfield3" maxlength="30" size="50" value="<s:property value="createTable.tableComments" />" />
          </td>
        </tr>
    <tr>
      <td height="10"></td>
      </tr>
        <tr>
          <td><table width="100%" border="0" cellspacing="0" cellpadding="2" class="td00 table table-striped table-bordered table-hover">
            <tr >
              <th width="60px" >序号</th>
              <th>字段名</th>
              <th>字段类型</th>
              <th width="10%" >操作</th>
            </tr>
            <s:iterator value="createTableColumnList" status="st">
            <tr>
              <td align="center"><s:property value="#st.index+1"/></td>
              <td align="center">
                <input name="columnComments" class="input96 required" size="40" type="text" value="<s:property value="columnComments" />"/>
              </td>
              <td align="center">
                <select name ="dataType" style="width:150px;" >
                      <option <s:if test="'VARCHAR2'==dataType"> selected </s:if> value="VARCHAR2">字符串</option>
                      <option <s:if test="'NUMBER(16)'==dataType"> selected </s:if> value="NUMBER(16)">整数</option>
                      <option <s:if test="'NUMBER(16,4)'==dataType"> selected </s:if> value="NUMBER(16,4)">小数</option>
                      <option <s:if test="'DATE'==dataType"> selected </s:if> value="DATE">日期</option>
                </select>
              </td>
              <td align="center">
              <a href="<%=request.getContextPath() %>/webmaster/filesmessage/createTableAction!deleteColumn.action">
              <img src="<%=request.getContextPath() %>/webmaster/images/delete.gif" width="18" height="21" alt="删除" title="删除"></a></td>
            </tr>
            </s:iterator>
          </table></td>
        </tr>
        <tr>
          <td><table width="100%" border="0" cellspacing="0" cellpadding="0" align="center">
            <tr>
              <td align="center">
                  <input  type="submit" id="addTable" class="btn btn-info" value="新增字段" onClick="addColumn('add')"/>
                  <input  type="submit" id="saveTable" class="btn btn-info" value="提交" onClick="addColumn('save')"/>
                  <input type="button" name="button" id="button" value="关闭" class="btn btn-light" onClick="window.close();return false();">
              </td>
              </tr>
            </table></td>
          </tr>
      </table>
      </td>
    </tr>
</table>
</form>

java：

private List<CreateTableColumn> createTableColumnList;
private String type;
private String[] columnComments;
private String[] dataType;

public String addColumn() {
    if (null == createTableColumnList) {
        createTableColumnList = new ArrayList<>();
    }

    if (null != columnComments) {
        CreateTableColumn addCreateTableColumn = null;
        for (int i=0; i < columnComments.length; i++) {
            addCreateTableColumn = new CreateTableColumn();
            addCreateTableColumn.setColumnComments(columnComments[i]);
            addCreateTableColumn.setDataType(dataType[i]);
            createTableColumnList.add(addCreateTableColumn);
        }
    }

    if ("add".equals(type)) {
        CreateTableColumn addCreateTableColumn = new CreateTableColumn();
        createTableColumnList.add(addCreateTableColumn);
    } else {

    }

    return "createTableJsp";
}

public List<CreateTableColumn> getCreateTableColumnList() {
    return createTableColumnList;
}

public void setCreateTableColumnList(List<CreateTableColumn> createTableColumnList) {
    this.createTableColumnList = createTableColumnList;
}

public String getType() {
    return type;
}

public void setType(String type) {
    this.type = type;
}

public String[] getColumnComments() {
    return columnComments;
}

public void setColumnComments(String[] columnComments) {
    this.columnComments = columnComments;
}

public String[] getDataType() {
    return dataType;
}

public void setDataType(String[] dataType) {
    this.dataType = dataType;
}