Pagination With Spring MVC

[Gus Hayes]

Hi,
I am trying to follow a tutorial on pagination using Spring MVC's PagedListHolder object. I am integreating it with my own controller class and thymeleaf view. The code is as follows:


StoreController

@RequestMapping(value="/category")
	    public String productsRedirect(HttpServletRequest request){
		 	request.getSession().setAttribute("productList", null);
	        return "redirect:/products/page/1";
	    }
	 
	 @SuppressWarnings({"rawtypes","unchecked"})
	 @RequestMapping(value = "/products/page/{pageNumber}", method = RequestMethod.GET)
	    public String showPagedProductsPage(HttpServletRequest request, @PathVariable Integer pageNumber,Model uiModel){

	     logger.info("Showing paged products page # {}", pageNumber);  
		 PagedListHolder<?>pagedListHolder =  
				 (PagedListHolder<?>)request.getSession().getAttribute("productList");
				 
			if(pagedListHolder == null) {
				pagedListHolder = newPagedListHolder(productService.getByCategoryId());
				pagedListHolder.setPageSize(5);
			} else {
				
				final int goToPage=pageNumber-1;
				if(goToPage<=pagedListHolder.getPageCount() && goToPage>=0) {
					pagedListHolder.setPage(goToPage);
				}
			}

	        request.getSession().setAttribute("productList", pagedListHolder);
	        
	        //Pagination variables
	        int current = pagedListHolder.getPage() + 1;
	        int begin = Math.max(1, current - 5);
	        int end = Math.min(begin + 5, pagedListHolder.getPageCount());
	        int totalPageCount = pagedListHolder.getPageCount();
	        String baseUrl = productsRedirect(null);

	        uiModel.addAttribute("beginIndex", begin);
	        uiModel.addAttribute("endIndex", end);
	        uiModel.addAttribute("currentIndex", current);
	        uiModel.addAttribute("totalPageCount", totalPageCount);
	        uiModel.addAttribute("baseUrl", baseUrl);
	        uiModel.addAttribute("MODEL_ATTRIBUTE_PRODUCTS", pagedListHolder);

	        return "store_catalog/products";
	    }

Thymeleaf View Page

<div class="row">
    <div class="col-md-12 text-center">
        <div class='pagination pagination-centered'>
            <ul class="pagination">
                <li th:class="${currentIndex == 1}? 'disabled' : ''">
                    <span th:if='${currentIndex == 1}'>First</span>
                    <a th:if='${currentIndex != 1}'
                       th:href="@{products/page/1'}">First</a>
                </li>
                <li th:class="${currentIndex != 1}? '' : 'disabled'">
                    <span th:if='${currentIndex == 1}'>«</span>
                    <a th:if='${currentIndex != 1}'
                       th:href="@{|${baseUrl}$(currentIndex - 1)|}"
                       title='Go to previous page'>«</a>
                </li>

                <li th:each="item : ${#numbers.sequence(beginIndex,endIndex)}"
                    th:class="${item == currentIndex ? 'active' : '' }">
                    <span th:if='${item == currentIndex}' th:text='${item}'>1</span>
                    <a th:if='${item != currentIndex}'
                       th:href="@{|${baseUrl}${item }|}">
                        <span th:text='${item}'>1</span>
                    </a>
                </li>

                <li th:class="${currentIndex != totalPageCount}? '' : 'disabled'">
                    <span th:if='${currentIndex == totalPageCount}'>»</span>
                    <a th:if='${currentIndex != totalPageCount}'
                       th:href="@{|${baseUrl}${currentIndex + 1}|}" 
                       title='Go to next page'>»</a>
                </li>
                <li th:class="${currentIndex == totalPageCount}? 'disabled' : ''">
                    <span th:if='${currentIndex == totalPageCount}'>Last</span>
                    <a th:if='${currentIndex != totalPageCount}'
                       th:href="@{|${baseUrl}${totalPageCount}|}">Last</a>
                </li>
            </ul>
        </div>
    </div>
</div>

ProductService

@Service
@Transactional
public class ProductService {

	@Resource
	private ProductDao productDao;
	
	public List<Product> getByCategoryId(Byte id) {
		return productDao.findByCategoryId(id);
	}
	
	public Product getById(Integer id) {
		return productDao.findOne(id);
	}
	

I get a fault in my controller @ line 16 " pagedListHolder = newPagedListHolder(productService.getByCategoryId()); " as my method call here is not the same as the method in ProductService @ line 8 " public List<Product> getByCategoryId(Byte id) { ", when I try and change it the PagedListHolder comes up with an unresolved fault.

Thanks in advance,
Regards,
Gus

[K. Tsang]

Your ProductService#getByCategoryId method has a parm Byte id but in your controller you didn't pass one in.