用thymeleaf的th：each双重循环遍历不出来

用thymeleaf的th：each双重循环遍历不出来

@Controller
@RequestMapping("/admin")
public class AdminController {

    @Autowired
    private VideoServiceImpl videoServiceimpl;
    @Autowired
    private TypeServiceImpl typeServiceimpl;

    @GetMapping(value = {"","/index"})
    public String index(HttpServletRequest request){
        List

public class Video {
    private int id;
    private String topic;
    private String path;
    private Date created;
    private int typeId;
    private List types=new ArrayList();

        <div th:each="video:${videos}">
            <span th:text="${video.topic}">视频标题span>
            <span th:text="${video.created}">视频创建时间span>
            
            <div th:each="type:${video.types}"><span th:text="${type.name}">视频的分类span>div>
        div>

为什么页面显示不出来

• 看下这篇博客，也许你就懂了，链接：关于thymeleaf组件中th:each的遍历功能出现的问题