『实践』Java Web开发之分页（ajax）

 1 public class NewsListPage {
 2 
 3     //当前页码
 4     private int pageIndex;
 5     //每页显示的记录条数
 6     private int pageSize;
 7     //总页数
 8     private int pageCount;
 9     //当前页的数据
10     private List<News> newsList = new ArrayList<News>();
11 } 

   1 //获得分页的新闻信息列表

 NewsListPage();
 4         List<News> newsList = iFrameDao.getNewsList(pageSize, pageIndex);
 5         int count = iFrameDao.getNewsCount(); 7         //计算需要分的页数
 8         int pageCount = 0;
 9         if(count%pageSize == 0){
10             pageCount = count/pageSize;
11         }else{
12             pageCount = count/pageSize + 1;
13         }
14         ......
18         ......22         return newsListPage;
23     }
24     //获得newslist.jsp新闻信息列表
25     public List<News> getNewsList(int pageSize,int pageIndex){
26         List<News> newsList = iFrameDao.getNewsList(pageSize,pageIndex);
27         return newsList;
28     }
29     
30     //获得新闻记录总数
31     public int getNewsCount(){
32         int count = iFrameDao.getNewsCount();
33         return count;
34     }

public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        IFrameBll iframeBll = new FrameBll();
        
        // 设定默认的每页显示条数
        int pageSize = 15;
        // 设定默认的页码数
        int pageIndex = 1;
        String currentIndex = request.getParameter("pageIndex");
        if(currentIndex != null){
            pageIndex = Integer.parseInt(currentIndex);
        }
        //获得分页的新闻信息列表
        NewsListPage newsListPage = iframeBll.getNewsListPage(pageSize,pageIndex);
        JSONArray json = null;
        json=new JSONArray().fromObject(newsListPage);
        PrintWriter out = response.getWriter();
        out.write(json.toString());
        out.flush();
        out.close();
    }

/**
 * newslist.jsp
 */
var model = {  
        pageIndex: 1,      //索引页  
        pageSize: 3,      //每页列表的行数  
        //filterCounts: 1,   //筛选后的总行数  
        pageCount: 1,//总页数
    }; 

    $(document).ready(function () {  
        Filter();  
    });
    
    function Filter() {  
        $.ajax({  
            type:"POST",  
            dataType:"json",  
            url:"news.do",   //回发到的页面  
            data:"pageIndex=" + model.pageIndex + "&pageSize=" + model.pageSize,
            //async:false, 
            cache:false, 
            success: function(data) {
                var newsdata = eval(data);
                if (newsdata[0].pageCount == 0 ) {
                        //model.filterCounts = 1;
                }else{
                    model.pageSize = newsdata[0].pageSize;
                    model.pageCount = newsdata[0].pageCount;
                    model.pageIndex = newsdata[0].pageIndex;
                }  
                $("#news").empty();   //清空div中内容
                $("#news").append('<ul >);
                
                $.each(newsdata[0].newsList, function (index, content) {
                    。。。。。
　　　　　　　　　　　　显示的数据，具体样式自定义。
                    。。。。。

                })
                
                paginator(model.pageIndex, model.pageSize,model.pageCount); 
                
            },
            error:function(){
                $("#news").empty();   //清空div中内容
                $("#news").append('<strong><p style="text-indent:2em">No Contents</p></strong>');
            }
        });  
    }
    
    function paginator(pageIndex, pageSize, pageCount) {  
        $.jqPaginator('#jqPaginator', {
            totalPages: pageCount,
            visiblePages: 10,
            currentPage: pageIndex,
            pageSize: pageSize,
            first: '<li><a href="javascript:void(0);">First</a></li>',  
            prev: '<li><a href="javascript:void(0);">Previous</a></li>',  
            next: '<li><a href="javascript:void(0);">Next</a></li>',  
            last: '<li><a href="javascript:void(0);">Last</a></li>',  
            page: '<li><a href="javascript:void(0);">{{page}}</a></li>',
            onPageChange: function (n, type) {  
                if (type == 'change' && n != model.pageIndex) {  
                    model.pageIndex = n;    //点击改变页码时，同步model中的页码  
                    Filter();               //重新生成新表  
                }  
            }
        });
    }

          <h2>News</h2>
               <div id="news" style="height:350px">
               <strong><p style="text-indent:2em">No Contents</p></strong>
               </div>
               <div align="center">
               <ul class="pagination" id="jqPaginator"></ul>
               </div>