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Java Web开发之分页(ajax)

2018-12-18  本文已影响78人  极课编程

1、需要用到的jar包、js文件

JSONArray().fromObject()需要的jar包:

(1)commons-beanutils-1.8.3.jar

(2)commons-collections-3.2.1.jar

(3)commons-lang-2.6.jar

(4)commons-logging-1.1.1.jar

(5)ezmorph-1.0.6.jar

(6)json-lib-2.4-jdk15.jar

jqPaginator分页组件:http://jqpaginator.keenwon.com/

(1)jquery-1.11.0.min.js

(2)jqPaginator.min.js

分页工具类
public class NewsListPage {

    //当前页码
    private int pageIndex;
    //每页显示的记录条数
    private int pageSize;
    //总页数
    private int pageCount;
    //当前页的数据
    private List<News> newsList = new ArrayList<News>();
}
获得分页的新闻信息列表
//获得分页的新闻信息列表
  public NewsListPage getNewsListPage(int pageSize,int pageIndex){
        NewsListPage newsListPage = new NewsListPage();
        List<News> newsList = iFrameDao.getNewsList(pageSize, pageIndex);
        int count = iFrameDao.getNewsCount(); 7         //计算需要分的页数
        int pageCount = 0;
        if(count%pageSize == 0){
            pageCount = count/pageSize;
        }else{
            pageCount = count/pageSize + 1;
        }
     
            return newsListPage;
    }
    //获得newslist.jsp新闻信息列表
    public List<News> getNewsList(int pageSize,int pageIndex){
        List<News> newsList = iFrameDao.getNewsList(pageSize,pageIndex);
        return newsList;
    }
    
    //获得新闻记录总数
    public int getNewsCount(){
        int count = iFrameDao.getNewsCount();
        return count;
    }
Servlet的创建
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();
    }
JS代码
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 id="ulnews" class="allnews">'+'</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  
                }  
            }
        });
    }
Jsp页面
               <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>
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