jsp代码
下面是代码的片段,导读如下:
- 显示页序号:comments.totalPages是总页数,链接格式为/ticket/view/${ticket.id}?paging.page=xxx&paging.size=xxxx,paging.page和paging.size或转换为controller方法中的Pageable参数,如果没有采用缺省的
- 显示该页内容,存放在comments.content中。
<h3><spring:message code="title.ticketView.comments" /></h3> <c:choose> <c:when test="${comments.totalElements == 0}"> <i><spring:message code="message.ticketView.noComments" /></i><br /><br /> </c:when> <c:otherwise> <spring:message code="message.ticketView.comments.page" /> :: <c:forEach begin="1" end="${comments.totalPages}" var="i"> <c:choose> <c:when test="${(i - 1) == comments.number}"> ${i} </c:when> <c:otherwise> <a href="<c:url value="/ticket/view/${ticket.id}"> <c:param name="paging.page" value="${i}" /> <c:param name="paging.size" value="10" /> </c:url>">${i}</a> </c:otherwise> </c:choose> </c:forEach><br/> <c:forEach items="${comments.content}" var="comment"> <i><c:out value="${comment.customerName}" /> </i> (<wrox:formatDate value="${comment.dateCreated}" type="both" timeStyle="short" dateStyle="medium" />)<br /> <c:out value="${comment.body}" /><br /><br /> </c:forEach> </c:otherwise> </c:choose>
java代码
仓库接口代码
我们创建TicketCommentEntity,在cn.wei.flowingflying.customer_support.site.repositories中创建相关的仓库接口:
public interface TicketCommentRepository extends CrudRepository<TicketCommentEntity, Long>{ // 新增接口,输出为Page<E> Page<TicketCommentEntity> getByTicketId(long ticketId, Pageable p); }
相关的Service代码
@Validated public interface TicketService { ...... @NotNull Page<TicketComment> getComments(@Min(value = 1L, message = "{validate.ticketService.getComments.id}") long ticketId, @NotNull(message = "{validate.ticketService.getComments.page}") Pageable page); }
@Service public class DefaultTicketService implements TicketService{ @Inject TicketRepository ticketRepository; ...... @Override public @NotNull Page<TicketComment> getComments( @Min(value = 1, message = "{validate.ticketService.getComments.id}") long ticketId, @NotNull(message = "{validate.ticketService.getComments.page}") Pageable page) { //这里假定用于UI显示的TicketComment和用户数据库存放的TicketCommentEntity有差异,这是常见的情况。而convert()是用于转换的方法。 List<TicketComment> comments = new ArrayList<>(); Page<TicketCommentEntity> entities = this.commentRepository.getByTicketId(ticketId, page); entities.forEach(e->comments.add(convert(e))); return new PageImpl<>(comments, page, entities.getTotalElements()); } }
相关的controller代码
//显示信息。转换器会自动将请求中的参数转换为Pageable page参数 @RequestMapping(value = "view/{ticketId}", method = RequestMethod.GET) public ModelAndView view(Map<String,Object> model, Pageable page, @PathVariable("ticketId") long ticketId){ Ticket ticket = this.ticketService.getTicket(ticketId); if(ticket == null) return getListRedirectModelAndView(); model.put("ticketId", ticketId); model.put("ticket", ticket); model.put("comments", this.ticketService.getComments(ticketId, page)); model.put("commentForm", new CommentForm()); //这是下面添加comment的form,相关代码从略 return new ModelAndView("ticket/view"); }
相关链接: 我的Professional Java for Web Applications相关文章