巴巴运动网学习笔记(26-30)

1.准备产品分类后台的管理页面(包括管理首页，产品类别列表显示页面，产品类别添加界面)

2.实现web层的分页功能(分页数据，开始页码和结束页码的计算，每页显示记录条数，总记录数，总页数)

3.将web层分页封装成通用模块(建立一个pagingBean对象来封装分页用到的数据，2中已列出)

a.action:

View Code

 1 public ActionForward execute(ActionMapping mapping, ActionForm form,
 2             HttpServletRequest request, HttpServletResponse response)throws Exception {
 3         
 4         ProductTypeForm productTypeForm = (ProductTypeForm)form;
 5         int currentPage = productTypeForm.getCurrentPage();
 6         int begin = (currentPage-1)*10;
 7         LinkedHashMap<String, String> orderHashMap = new LinkedHashMap<String, String>();
 8         orderHashMap.put("id", "asc");
 9         ScrollResult<ProductType> scrollResult = productTypeService.getScrollResult(ProductType.class,begin,10,orderHashMap,"p.visible=?1",new Object[]{true});
10         PagingBean<ProductType> pagingBean = new PagingBean<ProductType>(currentPage,scrollResult,10);
11         request.setAttribute("pagingBean", pagingBean);
12         return mapping.findForward("list");
13     }

b.pagingBean:

View Code

 1 public class PagingBean<T> {
 2     //总记录数
 3     private long totalRecords;
 4     //总页数
 5     private int totalPages;
 6     //当前页
 7     private int currentPage;
 8     //开始页码
 9     private int beginPageIndex;
10     //结束页码
11     private int endPageIndex;
12     //数据集
13     private ScrollResult<T> scrollResult;
14     //每页显示记录数
15     private int pageCounts = 10;
16     
17     
18     public PagingBean(int currentPage, ScrollResult<T> scrollResult,int pageCounts) {
19         this.currentPage = currentPage;
20         this.scrollResult = scrollResult;
21         this.pageCounts = pageCounts;
22         this.setTotalRecords(scrollResult.getCount());
23         this.setTotalPages((int)(scrollResult.getCount()%pageCounts==0?scrollResult.getCount()/pageCounts:scrollResult.getCount()/pageCounts+1));
24         this.setBeginPageIndex((int)(WebTool.getPageIndex(pageCounts, currentPage, totalPages).getStartindex()));
25         this.setEndPageIndex((int)(WebTool.getPageIndex(pageCounts, currentPage, totalPages).getEndindex()));
26     }
27     public int getPageCounts() {
28         return pageCounts;
29     }
30     public void setPageCounts(int pageCounts) {
31         this.pageCounts = pageCounts;
32     }
33     public long getTotalRecords() {
34         return totalRecords;
35     }
36     public void setTotalRecords(long totalRecords) {
37         this.totalRecords = totalRecords;
38     }
39     public int getTotalPages() {
40         return totalPages;
41     }
42     public void setTotalPages(int totalPages) {
43         this.totalPages = totalPages;
44     }
45     public int getCurrentPage() {
46         return currentPage;
47     }
48     public void setCurrentPage(int currentPage) {
49         this.currentPage = currentPage;
50     }
51     public int getBeginPageIndex() {
52         return beginPageIndex;
53     }
54     public void setBeginPageIndex(int beginPageIndex) {
55         this.beginPageIndex = beginPageIndex;
56     }
57     public int getEndPageIndex() {
58         return endPageIndex;
59     }
60     public void setEndPageIndex(int endPageIndex) {
61         this.endPageIndex = endPageIndex;
62     }
63     public ScrollResult<T> getScrollResult() {
64         return scrollResult;
65     }
66     public void setScrollResult(ScrollResult<T> scrollResult) {
67         this.scrollResult = scrollResult;
68     }
69 }

3.webTool和pageIndex:

View Code

 1 public class WebTool {
 2     public static PageIndex getPageIndex(long viewpagecount, int currentPage, long totalpage){
 3         long startpage = currentPage-(viewpagecount%2==0? viewpagecount/2-1 : viewpagecount/2);
 4         long endpage = currentPage+viewpagecount/2;
 5         if(startpage<1){
 6             startpage = 1;
 7             if(totalpage>=viewpagecount) endpage = viewpagecount;
 8             else endpage = totalpage;
 9         }
10         if(endpage>totalpage){
11             endpage = totalpage;
12             if((endpage-viewpagecount)>0) startpage = endpage-viewpagecount+1;
13             else startpage = 1;
14         }
15         return new PageIndex(startpage, endpage);        
16     }
17     
18 }

View Code

 1 public class PageIndex {
 2     private long startindex;
 3     private long endindex;
 4     
 5     public PageIndex(long startindex, long endindex) {
 6         this.startindex = startindex;
 7         this.endindex = endindex;
 8     }
 9     public long getStartindex() {
10         return startindex;
11     }
12     public void setStartindex(long startindex) {
13         this.startindex = startindex;
14     }
15     public long getEndindex() {
16         return endindex;
17     }
18     public void setEndindex(long endindex) {
19         this.endindex = endindex;
20     }
21 }

4.将分页功能从jsp页面中独立出来(主要实现href的独立)

a.topage()

View Code

1 <script language="JavaScript">
2     function topage(page){
3         var form = document.forms[0];
4         form.currentPage.value = page;
5         form.submit();
6     }
7 </script>

b.form

View Code

1 <html:form action="/control/product/type/list.do" method="post">
2 </html:form>

c.paging页面

View Code

 1 <%@ page contentType="text/html;charset=UTF-8" %>
 2 <%@ include file="/WEB-INF/page/share/taglib.jsp" %>
 3 <c:forEach begin="${pagingBean.beginPageIndex}" end="${pagingBean.endPageIndex}" var="index">
 4             <c:if test="${pagingBean.currentPage==index}">
 5                 <span style=color:#FFFFFF>第${index}页</span>
 6             </c:if>
 7             <c:if test="${pagingBean.currentPage!=index}">
 8                 <a style=color:#FFFFFF  href="javascript:topage(${index})">第${index}页</a>
 9             </c:if>
10 </c:forEach>

d.include

View Code

1 <%@ include file="/WEB-INF/page/share/paging.jsp" %>

5.初步完成产品类别的添加功能

View Code

 1 public class ProductTypeManagerAction extends DispatchAction {
 2     @Resource(name="productTypeServiceImpl")
 3     ProductTypeService productTypeService;
 4     /**
 5      * 提供添加界面
 6      * @param mapping
 7      * @param form
 8      * @param request
 9      * @param response
10      * @return
11      * @throws Exception
12 */
13     public ActionForward addUI(ActionMapping mapping, ActionForm form,
14             HttpServletRequest request, HttpServletResponse response)throws Exception {
15         return mapping.findForward("add");
16     }
17     /**
18      * 添加产品类别
19      * @param mapping
20      * @param form
21      * @param request
22      * @param response
23      * @return
24      * @throws Exception
25 */
26     public ActionForward add(ActionMapping mapping, ActionForm form,
27             HttpServletRequest request, HttpServletResponse response)throws Exception {
28         ProductTypeForm productTypeForm = (ProductTypeForm)form;
29         ProductType productType = new ProductType(productTypeForm.getName(),productTypeForm.getNote());
30         if((Integer)productTypeForm.getParentId()!=null&&productTypeForm.getParentId()>0)productType.setParent(new ProductType(productTypeForm.getParentId()));
31         productTypeService.save(productType);
32         request.setAttribute("message", "添加成功!");
33         return mapping.findForward("message");
34     }
35 }