Java 如何在百里香叶中打印数组大小？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/43484142/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to print Array size in thymeleaf?
提问by Wafdi Ahmed
I'm using Thymeleafwith spring mvc 4but I have a problem when I want to print a list size
我正在将Thymeleaf与spring mvc 4一起使用，但是当我想打印列表大小时遇到问题
<tr th:each="u : ${users}" th:id="${u.username}" class="odd gradeX">
<th></th>
<td th:text="${u.username}"></td>
<td th:text="${u.email}"></td>
<td th:switch="${u.enabled}">
<span th:case="true" class="badge badge-primary">Acitf</span>
<span th:case="false" class="badge badge-danger">Désactivée</span>
<span th:case="*" class="badge badge-dark">Inconnue</span>
</td>
<td th:switch="${u.roles}">
<span th:case="ROLE_SUPER_ADMIN">Super ADmin</span>
<span th:case="ROLE_MANGER">Manager</span>
<span th:case="ROLE_SUPERVISEUR">Superviseur</span>
<span th:case="ROLE_USER">User</span>
<span th:case="*">Inconnue</span>
</td>
<td th:text="${#calendars.format(u.creationDate,'dd/MM/yyyy hh:mm')}"></td>
<td th:text="${#calendars.format(u.lastLogin,'dd/MM/yyyy hh:mm')}"></td>
**
<td th:text="${u.engines}"></td>
<td th:text="${u.subordonnes}"></td>
**
<td></td>
</tr>
the problem is here th:text="${u.engines}</td>. enginesis an ArrayList in my Userentity. I tried th:sizeand th:listbut it didn't work.
问题就在这里th:text="${u.engines}</td>。engines是我User实体中的一个 ArrayList 。我试过了th:size，th:list但没有用。
Can anyone help me please
任何人都可以帮助我吗
Edited
已编辑
here is my Userentity:
这是我的User实体：
@OneToMany(mappedBy = "superieur")
@JsonIgnore
private List<User> subordonnes = new ArrayList<User>();
@ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinTable(name = "USERS_ENGINES", joinColumns = @JoinColumn(name = "USER_ID"), inverseJoinColumns = @JoinColumn(name = "NUM_EQUIPMENT"))
@JsonIgnore
private List<Engine> engines = new ArrayList<Engine>();
and my Controller method:
和我的控制器方法：
@RequestMapping(value = {"/listeUsers"})
public ModelAndView userlistePage() {
ModelAndView model = new ModelAndView();
User logedUser = (User) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
List<User> users = new ArrayList<User>();
users = userService.findUserSub(logedUser);
model.addObject("users", users);
model.setViewName("utilisateur/list_users");
return model;
}
采纳答案by vphilipnyc
Try using the utility method for org.thymeleaf.expression.Lists:
尝试使用实用方法org.thymeleaf.expression.Lists：
<td th:text="${#lists.size(u.engines)}">[Engine Size]</td>
