Struts2 web层分页解决方案

最新推荐文章于 2025-08-12 14:37:12 发布

yukiMark

最新推荐文章于 2025-08-12 14:37:12 发布

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CC 4.0 BY-SA版权

文章标签： struts web javascript iterator 工具 action

本文链接：https://blog.youkuaiyun.com/how8586/article/details/6459379

本文介绍了一种基于Java的分页查询实现方案，通过自定义`TotalRecord`和`PageIndex`工具类，实现了数据的分页展示及导航功能。该方案适用于Web应用中的大量数据分页展示场景。

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首先，两个工具类：

第一个TotalRecord,用来存放分页条件和查询出的数据

import java.util.List;

public class TotalRecord {
private List entities;
//总条数
private long totalCount=0;
//当前页
private int currentPage=1;
//每页显示数量
private int pageSize = 10;
//总页数
private long totalPage=0;
public TotalRecord(){
}
public TotalRecord(int currentPage){
this.currentPage = currentPage;
}
public TotalRecord(int currentPage,int pageSize){
this.currentPage = currentPage;
this.pageSize = pageSize;
}
public TotalRecord(int currentPage,int pageSize,int totalCount ){
this.currentPage = currentPage;
this.pageSize = pageSize;
this.totalCount=totalCount;
}
public List getEntities() {
return entities;
}
public void setEntities(List entities) {
this.entities = entities;
}
public long getTotalCount() {
return totalCount;
}
public void setTotalCount(long totalCount) {
this.totalCount = totalCount;
}
public int getFirstIndex() {
return (currentPage - 1)*pageSize;
}
public int getCurrentPage() {
return currentPage;
}
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public long getTotalPage() {
this.totalPage = this.totalCount%pageSize==0?this.totalCount/pageSize:this.totalCount/pageSize+1;
return this.totalPage;
}
}

第二个PageIndex,存放分页工具条信息

public class PageIndex {
private long startindex;
private long endindex;
public PageIndex(long startindex, long endindex) {
this.startindex = startindex;
this.endindex = endindex;
}
public long getStartindex() {
return startindex;
}
public void setStartindex(long startindex) {
this.startindex = startindex;
}
public long getEndindex() {
return endindex;
}
public void setEndindex(long endindex) {
this.endindex = endindex;
}
/**
*
* @param viewpagecount 显示页码数
* @param currentPage 当前页
* @param totalpage 总页数
* @return
*/
public static PageIndex getPageIndex(long viewpagecount, int currentPage, long totalpage){
long startpage = currentPage-(viewpagecount%2==0? viewpagecount/2-1 : viewpagecount/2);
long endpage = currentPage+viewpagecount/2;
if(startpage<1){
startpage = 1;
if(totalpage>=viewpagecount) endpage = viewpagecount;
else endpage = totalpage;
}
if(endpage>totalpage){
endpage = totalpage;
if((endpage-viewpagecount)>0) startpage = endpage-viewpagecount+1;
else startpage = 1;
}
return new PageIndex(startpage, endpage);
}
}

然后，是页面上的分页工具条，这里用一个jsp页面来做，使用的时候用<%@ include file="/util/PageBar.jsp" %>来将分页工具条包含在页面里：

<%@ page language="java" pageEncoding="UTF-8"%>
<a href="javascript:toPage(1)" mce_href="javascript:toPage(1)">首页</a>
<s:if test="#request.tr.currentPage!=1">
<a href='javascript:toPage(<s:property value="#request.tr.currentPage-1"></a>)'>上一页</a>
</s:if>
<s:bean name="org.apache.struts2.util.Counter" id="counter">
<s:param name="first" value="#request.pi.startindex" />
<s:param name="last" value="#request.pi.endindex" />
<s:iterator>
<s:if test="#counter.current-1==#request.tr.currentPage">
<s:property/>
</s:if>
<s:else>
<a href="javascript:toPage(<s:property></a>)"><s:property/></a>
</s:else>
</s:iterator>
</s:bean>
<s:if test="#request.tr.currentPage!=#request.tr.totalPage">
<a href='javascript:toPage(<s:property value="#request.tr.currentPage+1"></a>)'>下一页</a>
</s:if>
<a href="javascript:toPage(<s:property value=" mce_href="javascript:toPage(<s:property value="#request.tr.totalPage"></a>)">尾页</a>

工具条里面，翻页会用到javascript方法：toPage,此方法写在页面里，因为不同的页面处理跳转可能会有不同。

toPage方法使页面上的某个form提交数据，把页码作为参数传入后台action中

action代码：

public String getUsers(){
int page =1;
if(request.getParameter("page")!=null&&request.getParameter("page")!=""){
page =Integer.parseInt(request.getParameter("page").toString());
}
TotalRecord tr = new TotalRecord();
//tr.setEntities(list);
tr.setCurrentPage(page);
tr.setPageSize(5);
tr.setEntities(userbiz.getUsers(tr));
tr.setTotalCount(100);
PageIndex pi = PageIndex.getPageIndex(10, tr.getCurrentPage(),tr.getTotalPage());
request.setAttribute("tr", tr);
request.setAttribute("pi", pi);
return SUCCESS;
}