打拢了!Struts+Java分页问题,实在是找不出错在哪里了?先谢谢了

Question

首先,我说明一下错原因:程序运行正常,没有报错,可是不到下一页,求解
TeamPage.java
package com.fonytech.team.page;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import com.fonytech.vo.Team;
public class TeamPage {
int currentPage=1; //当前页 
public int totalPages=0; //总页数 
int pageRecorders=5;//每页5条数据 
int totalRows=0; //总数据数 
int pageStartRow=0;//每页的起始数 
int pageEndRow=0; //每页显示数据的终止数 
boolean hasNextPage=false; //是否有下一页 
boolean hasPreviousPage=false; //是否有前一页 
List arrayList; 
Iterator it; 
public TeamPage(){}  public TeamPage(List arrayList){ 
this.arrayList=arrayList; 
totalRows=arrayList.size(); 
it=arrayList.iterator(); 
hasPreviousPage=false; 
currentPage=1; 
if((totalRows%pageRecorders)==0) 
{ 
totalPages=totalRows/pageRecorders; 
} 
else 
{ 
totalPages=totalRows/pageRecorders+1; 
}  if(currentPage>=totalPages) 
{ 
hasNextPage=false; 
} 
else 
{ 
hasNextPage=true; 
} 

if(totalRows<pageRecorders) 
{ 
this.pageStartRow=0; 
this.pageEndRow=totalRows; 
} 
else 
{ 
this.pageStartRow=0; 
this.pageEndRow=pageRecorders; 
}  }  /** 
* @return Returns the currentPage. 
*/ 
public String getCurrentPage() { 
return this.toString(currentPage); 
} 
/** 
* @param currentPage The currentPage to set. 
*/ 
public void setCurrentPage(int currentPage) { 
this.currentPage = currentPage; 
} 
/** 
* @return Returns the pageRecorders. 
*/ 
public int getPageRecorders() { 
return pageRecorders; 
} 
/** 
* @param pageRecorders The pageRecorders to set. 
*/ 
public void setPageRecorders(int pageRecorders) { 
this.pageRecorders = pageRecorders; 
} 
/** 
* @return Returns the pageEndRow. 
*/ 
public int getPageEndRow() { 
return pageEndRow; 
} 
/** 
* @return Returns the pageStartRow. 
*/ 
public int getPageStartRow() { 
return pageStartRow; 
} 
/** 
* @return Returns the totalPages. 
*/ 
public String getTotalPages() {  return this.toString(totalPages); 
} 
/** 
* @return Returns the totalRows. 
*/ 
public String getTotalRows() { 
return this.toString(totalRows); 
} 
/** 
* @return Returns the hasNextPage. 
*/ 
public boolean isHasNextPage() { 
return hasNextPage; 
} 
/** 
* @param hasNextPage The hasNextPage to set. 
*/ 
public void setHasNextPage(boolean hasNextPage) { 
this.hasNextPage = hasNextPage; 
} 
/** 
* @return Returns the hasPreviousPage. 
*/ 
public boolean isHasPreviousPage() { 
return hasPreviousPage; 
} 
/** 
* @param hasPreviousPage The hasPreviousPage to set. 
*/ 
public void setHasPreviousPage(boolean hasPreviousPage) { 
this.hasPreviousPage = hasPreviousPage; 
} 
public Team[] getNextPage(){ 
System.out.println("1----------currentPage----------"+currentPage);

currentPage=currentPage+1; //就是在这里,它每次好像都是默认为1了,为什么不变呢,要是可以,就先拿到自己的机器上试一试吧

System.out.println("2----------currentPage----------"+currentPage);

System.out.println("PageBean.getNextPage()正在执行；"); 
System.out.println("参数currentPage="+currentPage); if((currentPage-1)>0) 
{ 
hasPreviousPage=true; 
} 
else 
{ 
hasPreviousPage=false; 
}  if(currentPage>=totalPages) 
{ 
hasNextPage=false; 
} 
else 
{ 
hasNextPage=true; 
} 
System.out.println("参数hasNextPage="+hasNextPage); 
System.out.println("准备执行PageBean.getBooks()"); 
Team[] ProductionVos=getProductionVos(); 
this.description();  return ProductionVos; 
}  public Team[] getPreviouspage(){  currentPage=currentPage-1;  if(currentPage==0){currentPage=1;}  if(currentPage>=totalPages) 
{ 
hasNextPage=false; 
} 
else 
{ 
hasNextPage=true; 
} 
if((currentPage-1)>0) 
{ 
hasPreviousPage=true; 
} 
else 
{ 
hasPreviousPage=false; 
} 
Team[] pro=getProductionVos(); 
this.description(); 
return pro; 
}  public Team[] getProductionVos(){ 
System.out.println("pageBean.getProductionVos（）开始执行；"); 

System.out.println("当前页:"+currentPage);

if(currentPage*pageRecorders<totalRows){//判断是否为最后一页 
pageEndRow=currentPage*pageRecorders; 
pageStartRow=pageEndRow-pageRecorders; 
} 
else{ 
pageEndRow=totalRows; 
pageStartRow=pageRecorders*(totalPages-1); 
} 
Team[] ProductionVos=new Team[pageEndRow-pageStartRow+1];  System.out.println("pageStartRow="+pageStartRow); 
System.out.println("pageEndRow="+pageEndRow); 
int j=0; 
for(int i=pageStartRow;i<pageEndRow;i++) 
{  Team ProductionVo=(Team)arrayList.get(i); 
ProductionVos[j++]=ProductionVo;  } 
System.out.println("要显示的页面数据已经封装,具体信息如下："); 
this.description(); 
return ProductionVos; 
}  public String toString(int temp) 
{ 
String str=Integer.toString(temp); 
return str; 
}  public void description() 
{  String description="共有数据数:"+this.getTotalRows()+  "共有页数: "+this.getTotalPages() +  "当前页数为:"+this.getCurrentPage()+  " 是否有前一页: "+this.isHasPreviousPage() +  " 是否有下一页:"+this.isHasNextPage()+  " 开始行数:"+this.getPageStartRow()+  " 终止行数:"+this.getPageEndRow();  System.out.println(description);  } 
}

Answer 1

这是action中的方法
public class TeamAction extends DispatchAction {
/*
 * Generated Methods
 */
TeamPage pb;
TeamDao teamDao = new TeamDao();
public ActionForward teamList(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {

List<Team> list = teamDao.teamList();

String action = request.getParameter("action");
System.out.println("===================================================取到参数action的值==="+action); 


if( action == null || action.equals(null) ){
pb = new TeamPage(list);
Team[] teams = pb.getProductionVos();
pb.description();
request.setAttribute("list", teams);
request.setAttribute("page", pb);
}else{
if(action=="nextPage" || action.equals("nextPage")){ 
System.out.println("函数pb.getNextPage()准备执行"); 
pb = new TeamPage(list);
Team[] teams = pb.getNextPage(); 
request.setAttribute("page",pb); 
request.setAttribute("list",teams); 
}
if(action=="previousPage" || action.equals("previousPage")){ 
System.out.println("参数action="+action);
System.out.println("函数pb.getPreviouspage()准备执行"); 
pb = new TeamPage(list);
Team[] teams=pb.getPreviouspage(); 
request.setAttribute("page",pb); 
request.setAttribute("list",teams); 
}
}


//request.setAttribute("list", list);
return mapping.findForward("teamList");
}
下面是JSP页面代码:
<%@ page language="java" pageEncoding="GBK"%><%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html lang="true">
  <head>
    <html:base />
    
    <title>team.jsp</title> <meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">    
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->  </head>
  
  <body>      <table border="1" align="center">
        <tr>
        <td>teamId </td>
        <td>teamName </td>
        <td>teamLocal </td>
        <td> 查看</td>
        </tr>
        <logic:present name="list" scope="request" >
        <logic:iterate name="list" id="team">
        <logic:present name="team" >
        <tr>
        <td><bean:write name="team" property="teamId" /> </td>
        <td><bean:write name="team" property="teamName" /> </td>
        <td><bean:write name="team" property="teamLocal" /> </td>
        <td><html:link action="team.do?method=view" paramId="teamId" paramName="team" paramProperty="teamId" >查看</html:link> </td>
        </tr>
        </logic:present>
        </logic:iterate>
        </logic:present>
      </table>
      <br>
      <center>
<logic:equal name="page" property="hasPreviousPage" value="true"> 
<html:link page="/team.do?method=teamList&action=previousPage">上一页</html:link> 
</logic:equal>
<logic:equal name="page" property="hasNextPage" value="true"> 
<html:link page="/team.do?method=teamList&action=nextPage">下一页</html:link> 
</logic:equal> <br><br><font size="2"> 
共有数据总数<font color="red"><strong><bean:write name="page" property="totalRows"/></strong></font>条&nbsp;  
共分<font color="red"><strong><bean:write name="page" property="totalPages"/></strong></font>页&nbsp;
当前是第<font color="red"><strong><bean:write name="page" property="currentPage"/></strong></font>页</font>
</center>
      
      
      <html:link action="team.do?method=add" >添加</html:link>
      <html:form action="team.do?method=find">
      <html:text property="teamName" value=""></html:text><html:submit></html:submit>
      </html:form>
      
      
      
      
  </body>
  
  
  
</html:html>

Answer 2

楼主你竟然在 Action 里面定义成员？你不知道 Action 是单实例的么？