JSP+JavaBean+Servlet实现各类列表分页功能

需求：

每页列表下都有一个分页的功能，显示总数量、当前页/总页数、首页、上一页、下一页、最后一页、GO到第几页

效果动态图：

实现思路：

因为每个列表页都需要，在每个出列表页数据的servlet中都要求出总数量、当前页、总页数、结果list这几个值，那么我就把这些变量封装到一个基本实体类中，然后在service实现类中去求出这些变量的算法，那么我servlet执行时候，只用获取页面当前页的值，就可以算出所有变量的值。说的有点不清晰，那么我们直接上代码吧！

首先我们先看一下JSP的页面结构：

列表页newsDetailList.jsp:

底部调用公共分页的jsp

 <!--隐藏域，当前页码  -->
 <input type="hidden" id="pageIndex" name="pageIndex" value="1"/>

<input type="hidden" id="totalPageCount" name="totalPageCount" value="${totalPageCount }"/>
<c:import url="rollPage.jsp">
      <c:param name="totalCount" value="${totalCount }"></c:param>
      <c:param name="currentPageNo" value="${currentPageNo }"></c:param>
      <c:param name="totalPageCount" value="${totalPageCount}"></c:param>
                
</c:import>

上面当前页的设置为隐藏域，只是为了获取当前在第几页这个数据，用来算出其它几个值。

totalPageCount的隐藏域是为了执行输入页面GO到相应页的操作

看一下rollPage.jsp：

 1 <html>
 2 <head>
 3 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 4 <title>Insert title here</title>
 5 <script type="text/javascript">
 6 function page_nav(frm,num){
 7         frm.pageIndex.value=num;
 8         frm.submit();
 9     }
10     
11     function go(frm,pageno){
12          //var regexp=/^\d+$/;
13          var regexp=/^[1-9]\d*$/;
14          var totalPage = document.getElementById("totalPageCount").value;
15         if(!regexp.test(pageno)){
16             alert("请输入 正确的数字！");
17             return false;
18         }else if((pageno-totalPageCount) > 0){
19             alert("总页码一共"+totalPageCount+"页，请输入正确的页码！");
20             return false;
21         }else{
22             page_nav(frm,pageno);
23         }  
24         
25     }
26 
27 
28 </script>
29 </head>
30 
31 <body>
32 
33     <div class="page-bar">
34         <ul class="page-num-ul clearfix">
35             <li>共${param.totalCount}条记录&nbsp;&nbsp;
36                 ${param.currentPageNo}/${param.totalPageCount }页</li>&nbsp;&nbsp;
37             <c:if test="${param.currentPageNo>1}">
38                 <a href="javaScript:page_nav(document.forms[0],1)">首页</a>&nbsp;&nbsp;
39                     <a
40                     href="javaScript:page_nav(document.forms[0],${param.currentPageNo-1});">上一页</a>&nbsp;&nbsp;
41                 </c:if>
42             <c:if test="${param.currentPageNo<param.totalPageCount}">
43                 <a
44                     href="javaScript:page_nav(document.forms[0],${param.currentPageNo+1});">下一页</a>
45                 <a
46                     href="javaScript:page_nav(document.forms[0],${param.totalPageCount });">最后一页</a>
47             </c:if>
48         </ul>
49         <span class="page-go-form"><label>跳转至</label> <input
50             type="text" name="inputPage" id="inputPage" class="page-key" value="" />页
51 
52 
53             <button type="submit" class="page-btn"
54                 onclick='go(document.forms[0],document.getElementById("inputPage").value)'>GO</button>
55 
56         </span>
57     </div>
58 </body>
59 </html>

这个公共的分页，作用：控制分页界面的显示及提交到当前选择的页码

后端DAO实体类：

package com.cn.pb.dao.util;

import java.sql.Connection;
import java.util.List;

public class PageBase<M> {
    //当前页码,默认为第1页
    private int currentPageNo =1;
    //总页数
    private int totalPageCount;
    //总记录数
    private int totalCount;
    //页面容量
    private int pageSize=5;
    //上一页
    private int upPageNo;
    //下一页
    private int nextPageNo;
    
    //一页的结果
    private List<M> list;
    
    
    public int getUpPageNo() {
        return upPageNo;
    }
    public void setUpPageNo(int upPageNo) {
        //如果当前页>1
        if(this.currentPageNo>1){
            this.upPageNo = this.currentPageNo-1;
        }
        
    }
    public int getNextPageNo() {
        return nextPageNo;
    }
    public void setNextPageNo(int nextPageNo) {
        //如果当前页>0且小于总页数，则可以有下一页
        if(this.currentPageNo>0 &&this.currentPageNo<this.totalPageCount){
            this.nextPageNo = currentPageNo+1;
        }
        
    }
    public List<M> getList() {
        return list;
    }
    public void setList(List<M> list) {
        this.list = list;
    }
    public int getCurrentPageNo() {
        return currentPageNo;
    }
    //如果当前页码大于0才设置当前页码值
    public void setCurrentPageNo(int currentPageNo) {
        if(currentPageNo>0){
            this.currentPageNo = currentPageNo;
        }
        
    }
    
    public int getTotalCount() {
        return totalCount;
    }
    public void setTotalCount(int totalCount) {
        if(totalCount>0){
            this.totalCount = totalCount;
        }
        
    }
    public int getPageSize() {
        return pageSize;
    }
    public void setPageSize(int pageSize) {
        if(pageSize >0){
            this.pageSize = pageSize;
        }
        
    }
    
    public int getTotalPageCount() {
        return totalPageCount;
    }
    public void setTotalPageCount(int totalPageCount) {
        if(this.getTotalCount()%this.pageSize==0){
            this.totalPageCount = this.getTotalCount()/this.pageSize;
        }else if(this.getTotalCount()%this.pageSize>0){
            this.totalPageCount = this.getTotalCount()/this.pageSize +1 ;
        }else{
            this.totalPageCount =0;
        }
    }
    
    
    /*//设置总页数
    public void setTotalPageCount(int ) {
        if(this.getTotalCount()%this.pageSize==0){
            this.totalPageCount = this.getTotalCount()/this.pageSize;
        }else if(this.getTotalCount()%this.pageSize>0){
            this.totalPageCount = this.getTotalCount()/this.pageSize +1 ;
        }else{
            this.totalPageCount =0;
        }
        
    }
    */
    
}

service接口：

1 //分页和list独立出一个javabean
2         public PageBase<NewsDetail> getPages(int pageNo,String where);

service实现类：

 1 public PageBase<NewsDetail> getPages(int pageNo,
 2             String where) {
 3         PageBase<NewsDetail> pb=new PageBase<NewsDetail>();
 4         pb.setCurrentPageNo(pageNo);
 5         pb.setTotalCount(this.getNewsCount(where));
 6         pb.setTotalPageCount(pb.getTotalCount()/pb.getPageSize());
 7         pb.setNextPageNo(pageNo-1);
 8         pb.setUpPageNo(pageNo+1);
 9         pb.setList(this.getPageNewsList(pageNo, pb.getPageSize(), where));
10         return pb;
11     }

web.xml

1 <servlet>
2       <servlet-name>newsListByLikeServlet</servlet-name>
3       <servlet-class>com.cn.pb.servlet.NewsListByLike3</servlet-class>
4   </servlet>
5   <servlet-mapping>
6       <servlet-name>newsListByLikeServlet</servlet-name>
7       <url-pattern>/servlet/newsListServlet</url-pattern>
8   </servlet-mapping>

其实也就是把我上一篇<JSP+Servlet+javabean实现页面多条件模糊查询>中servlet那部分分页和求结果list给抽出来封装了,好吧，我只是改了web.xml中的类名，其它地方啥都不用改。可以多个servlet切着来

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JSP+JavaBean+Servlet实现各类列表分页功能

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