求教jsp分页显示的问题，如何循环并分页取得参数？

Posted 2023-05-09

Page page = PageUtil.createPage(3, esql.findAllCount(), currentPage);//创建页面为：每页显示3个、取得总显示数、当前页。
List<Employee> employees = esql.findEmployees(page);//取得员工的集合类

员工属性有userName、employeeNo、roleId
据此，如何分页显示员工的信息？

这个是一个可用的分页代码，如何调用就不说了吧，但是在用之前要先指明ResultSet的值

import java.sql.ResultSet;
public class rsFenYe
ResultSet rs=null; //要分页处理的记录数
int currentPage=1; //当前页码
int pageSize=10; //每页记录的条数，默认为10
/**
* 得到分页字串，并把记录指针移到当前页的第一条记录的前面的位置
* 输入：返回的JSP页面，refName 数组为超链接中继 currentPage 之后的参数名，refValue为对应值
* 输出：字符串“共2页，当前第1页 下一页 末页”
*/
public String earn_fenye_string(String returnJSP)
String returnString=new String("");
if(rs==null)
return returnString;

int pageCount=0; //总页数
int rowCount=0; //rs的总记录条数
if(pageSize<=0) //每页记录条数不正确
return returnString;


try
//------得到记录总条数--------
rs.last();
rowCount=rs.getRow();
rs.beforeFirst();

//------记录指针移位----------
int RecordPosition=(currentPage-1)*pageSize;
if(RecordPosition==0)
rs.beforeFirst();
else
rs.absolute(RecordPosition);

catch(Exception e)
System.out.println(e);
return returnString;


//-------得到总页数-----
if(rowCount%pageSize==0)
pageCount=rowCount/pageSize;
else
pageCount=rowCount/pageSize+1;


//-------得到返回字符串--------
returnString="共"+pageCount+"页，当前第"+currentPage+"页  ";
if(currentPage!=1 && pageCount!=0) //不是首页且总页数不为0
returnString=returnString+"<a href='"+returnJSP+"?currentPage=1";
returnString=returnString+"'>首页</a> ";

returnString=returnString+"<a href='"+returnJSP+"?currentPage="+(currentPage-1);
returnString=returnString+"'>上一页</a> ";


if(currentPage!=pageCount&&pageCount!=0) //不是末页且总页数不等于0
returnString=returnString+"<a href='"+returnJSP+"?currentPage="+(currentPage+1);
returnString=returnString+"'>下一页</a> ";

returnString=returnString+"<a href='"+returnJSP+"?currentPage="+pageCount;
returnString=returnString+"'>末页</a> ";


return returnString;


public ResultSet getRs()
return rs;


public void setRs(ResultSet rs)
this.rs = rs;


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;

参考技术A 写一个分页类，在servlet调用里面的方法取数据并传到jsp页面
分页类
package Tool;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;

import com.sun.crypto.provider.RSACipher;
import com.sun.jndi.url.iiopname.iiopnameURLContextFactory;

public class Pagination2
static int renum;//数据库中所有数据
static int pagenow;//当前页
static int pagesize;//每页显示数据数
static int pagenum;//总页数
public static int Renum(List list)
int i=0;
for(;i<list.size();i++);
renum=i;
return renum;

public static int Pagenum(int pagesize,int renum)
pagenum=renum%pagesize==0?renum/pagesize:renum/pagesize+1;
return pagenum;

public static String Page(int pagenow,int pagenum)
int i;
String page="<script type='text/javascript'> function jump()var jump=document.getElementById('jump');alert(jump.value);if(jump.value>0&&jump.value<="+pagenum+")location.href='test?pagenow='+jump.valueelsealert('请输入正确的页数')</script><table> <tr> <td><input type='text' name='jump' id='jump'><input type='button' value='跳转' onclick='jump()'>当前页 "+pagenow+"/总页数"+pagenum+"";
if(pagenow>1)
page=page+" <a href='test?pagenow="+(pagenow-1)+"'>上一页</a>";

String page2="";
if(pagenow<=pagenum-2)
int j=pagenow+3;
i=pagenow;
do
page2=page2+"  <a href='test?pagenow="+i+"'>"+i+"</a>";
i++;
while(i<j&&i<=pagenum);
else
for(i=pagenum-2;i<=pagenum;i++)
page2=page2+"  <a href='test?pagenow="+i+"'>"+i+"</a>";


page=page+page2;
if(pagenow<pagenum)
page=page+" <a href='test?pagenow="+(pagenow+1)+"'>下一页</a></td></tr></table>";

return page;

public static List dateList(int pagenow,List list,int pagesize)
List list2=new ArrayList();
for(int i=(pagenow-1)*pagesize;i<pagenow*pagesize&&i<list.size();i++)
list2.add(list.get(i));

return list2;


jsp页面
<c:forEach items="$list" var="item" >
<tr>
<td><c:out value="$item.参数 "></c:out></td>
</tr>
</c:forEach>
<%=page2 %> 参考技术B for（int i=currentPage*3；i<(currentPage+1)*3;i++）
Employee employee = employees .get(i);
//显示
//................

mysql存储过程嵌套循环并分页处理数据

业务背景：公司存证产品升级，随着数据量的增加，存证产品线按业务分表，导致以往的存证关联数据需要做数据同步更新。版本发布前，通过当前存储过程解决数据升级问题。

##创建存证文档关联情况下更新所用存储过程

CREATE PROCEDURE evi_doc_refs_eid_deal()
begin
    declare pageNum int default 0;
    declare totalSize int default 0;
    declare pageSize int default 5;
    declare totalPage int DEFAULT 0;
    declare startIndex int default 0;
    select count(*) into totalSize from osv_service_evidence where type != 11 and type !=12 and type !=50  ;
    set totalPage = totalSize/pageSize;        
        while ( pageNum<totalPage-1) do 
                #对分页的起始下标计算，以便分页查询时使用
                set startIndex = pageNum *pageSize;
                #开启事务
              　START TRANSACTION;
                #嵌套内部分页查询，通过游标处理分页查询结果记录
                begin 
               #声明变量
                   declare eviId varchar(50);
                   declare evidenceEid varchar(50);
                   declare done int default 0;
                   declare mark varchar(2);
                   declare eid_value varchar(50);
                   declare type_value int default 0;
                   declare eid_mark varchar(50);
　　　　            declare num int DEFAULT 0;
            　　　　#定义分页查询结果的游标
                   declare i_cur cursor for select id from osv_service_evidence where type !=11 and type !=12 and type !=50 limit startIndex,pageSize;
                   declare continue handler for sqlstate ‘09000‘ set done = 1;
            
                   open i_cur; 
                       fetch next from i_cur into eviId;
            
                       WHILE (done = 0 ) do
                          #判断每页中处理数据的下标index
                          set num = num+1;
                          select type into type_value  from osv_service_evidence where id = eviId;      
                          select e.eid into eid_value from osv_service_evidence e where id = eviId;
                                
                          if(0 =type_value|null = eid_value) then fetch next from i_cur into eviId;
                          end if;
                  
                  　　　　　　#数据处理
                            if     type_value =40 then set mark = ‘O‘; set eid_mark=concat(mark,eid_value);update evi_doc_refs set docEid = eid_mark where docEviId = eviId;
                            elseif type_value =11 then set mark = ‘S‘; set eid_mark=concat(mark,eid_value);update evi_doc_refs set docEid = eid_mark where docEviId = eviId;set done = 0;
                            end if;
                                        
                  　　　　　#如果当前页处理的数据已达页记录数值，通过done退出内部循环，进入外部循环
                  　　　　  IF num = pageSize THEN set done = 1;
                  　　　　  #否则继续当前循环
                 　　　　　　ELSEIF num !=pageSize THEN set done =0;
                      　　　　　　fetch next from i_cur into eviId;
                  　　　　　 END IF;
                       END WHILE;
            　　　　#关闭游标
                   close i_cur;
                end ;
        COMMIT;
    　　#更新下一次处理的页码，+1
        set pageNum = pageNum+1;
    end while;
END;

call evi_doc_refs_eid_deal();

 

##创建出证订单表中存证编号为null的情况下更新所用存储过程
create procedure evi_order_refs_eid_deal()
begin
declare original_eviId varchar(50);
declare evidenceEid varchar(50);
declare done int default 0;
declare mark varchar(2);
declare eid_value varchar(50);
declare type_value int default 0;
declare eid_mark varchar(50);
# declare existence boolean ;
##
declare cur cursor for select eviId  from evi_order_refs where evidenceEid is null order by createTime desc;
##异常处理(触发sql语句失败，执行结束)
declare continue handler for sqlstate ‘09000‘ set done = 1;
open cur;
    ##取出游标值至变量中
    fetch next from cur into original_eviId;
　　repeat
    if not done then 
       
                    select type into type_value  from osv_service_evidence where id = original_eviId;
                    #逻辑判断，如果eviId确实在存证表中无记录，直接忽略该条出证记录
                    
                    select e.eid into eid_value from osv_service_evidence e where id = original_eviId;
                    #逻辑判断，如果eviId确实在存证表中无记录，直接忽略该条出证记录
                    if(0 =type_value|null = eid_value) then fetch next from cur into original_eviId;
                    end if;
                        
                    if     type_value =40 then set mark = ‘O‘;set eid_mark=concat(mark,eid_value);update evi_order_refs set evidenceEid = eid_mark where eviId = original_eviId;
                    elseif type_value =11 then set mark = ‘S‘;set eid_mark=concat(mark,eid_value);update evi_order_refs set evidenceEid = eid_mark where eviId = original_eviId;else  set done = 0;
　　　　　　　　　　　　end if;
    　　　　　　end if;
        #if(done = 1) then leave cur;
        
        ##重新抓取数据进入循环
    fetch next from cur into original_eviId;
##结束循环
until done end repeat;
##关闭游标
close cur;
end ;