一个通用的Java分页基类代码详解

2023-09-19 02:29:06 159

分页的基类

importjava.util.List;
/**
*分页显示的标准类,基本操作,是先给予-当前页数一共的数据条数-每页显示的条数,
*然后在初始化该类,得到总共页数,和开始序号和结束序号,
*然后数据库分页用到开始序号和结束序号,得到数据集合后赋值给该类的list属性,
*
*然后把该类发送到jsp页面,进行访问
*@authoradmin
*
*@param
*/
publicclassPageBean{
	privateintpageIndex;
	//当前页数
	privateintpageSize;
	//一共的页数
	privateintcount;
	//数据条数
	privateintpageCount;
	//每页的数据条数
	privateintstart;
	//起始数据位置
	privateintend;
	//结束
	privateListlist=null;
	publicvoidinit(){
		/*根count和pageCount计算页数pageSize
*/
		intpageSize_x=(int)count/pageCount;
		if(count>=pageCount){
			this.pageSize=count%pageCount==0?pageSize_x:pageSize_x+1;
		}else{
			this.pageSize=1;
		}
		//判断页数和当前页数
		if(pageIndex>pageSize){
			pageIndex=pageSize;
		}
		if(pageIndex<1){
			pageIndex=1;
		}
		//根据当前页计算起始和结束条目
		this.start=(pageIndex-1)*pageCount+1;
		this.end=pageIndex*pageCount;
	}
	publicPageBean(intpageIndex,intcount,intpageCount){
		super();
		this.pageIndex=pageIndex;
		this.count=count;
		this.pageCount=pageCount;
	}
	publicPageBean(intpageIndex,intcount,intpageCount,Listlist){
		super();
		this.pageIndex=pageIndex;
		this.count=count;
		this.pageCount=pageCount;
		this.list=list;
	}
	publicPageBean(){
		super();
		//TODOAuto-generatedconstructorstub
	}
	@Override
	publicStringtoString(){
		return"PageBean[count="+count+",end="+end+",list="+list
		+",pageCount="+pageCount+",pageIndex="+pageIndex
		+",pageSize="+pageSize+",start="+start+"]";
	}
	publicintgetPageIndex(){
		returnpageIndex;
	}
	publicvoidsetPageIndex(intpageIndex){
		this.pageIndex=pageIndex;
	}
	publicintgetPageSize(){
		returnpageSize;
	}
	publicvoidsetPageSize(intpageSize){
		this.pageSize=pageSize;
	}
	publicintgetCount(){
		returncount;
	}
	publicvoidsetCount(intcount){
		this.count=count;
	}
	publicintgetPageCount(){
		returnpageCount;
	}
	publicvoidsetPageCount(intpageCount){
		this.pageCount=pageCount;
	}
	publicintgetStart(){
		returnstart;
	}
	publicvoidsetStart(intstart){
		this.start=start;
	}
	publicintgetEnd(){
		returnend;
	}
	publicvoidsetEnd(intend){
		this.end=end;
	}
	publicListgetList(){
		returnlist;
	}
	publicvoidsetList(Listlist){
		this.list=list;
	}
}

servlet调用

importjava.io.IOException;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importcom.dao.MessageDao;
importcom.dao.impl.MessageDaoImpl;
importcom.vo.Message;
importcom.vo.PageBean;
publicclassShowMessageServletextendsHttpServlet{
	/**
*
*/
	privatestaticfinallongserialVersionUID=6646899131087204214L;
	@Override
	protectedvoiddoPost(HttpServletRequestreq,HttpServletResponseresp)
	throwsServletException,IOException{
		doGet(req,resp);
	}
	@Override
	protectedvoiddoGet(HttpServletRequestreq,HttpServletResponseresp)
	throwsServletException,IOException{
		req.setCharacterEncoding("UTF-8");
		resp.setContentType("text/html;charset=utf-8");
		intpageIndex=0;
		MessageDaomd=newMessageDaoImpl();
		StringpageIndexStr=req.getParameter("pageIndex");
		if(pageIndexStr!=null){
			try{
				pageIndex=Integer.parseint(pageIndexStr);
			}
			catch(Exceptione){
			}
		}
		PageBeanpb=newPageBean(pageIndex,md.getMessageCount(),10);
		pb.init();
		pb.setList(md.getMessageListOfPage(pb.getStart(),pb.getEnd()));
		req.setAttribute("pagebean",pb);
		req.getRequestDispatcher("index.jsp").forward(req,resp);
	}
}

jsp页面的显示调用

<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<%@tagliburi="http://java.sun.com/jsp/jstl/core"prefix="c"%>



"rel="externalnofollow">

MyJSP'index.jsp'startingpage












${message.title}${message.editdate}


下一个[${pagebean.pageIndex}/${pagebean.pageSize}]

总结

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一个通用的Java分页基类代码详解

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