Struts简单分页显示

最新推荐文章于 2025-04-24 21:30:00 发布

dazhan

最新推荐文章于 2025-04-24 21:30:00 发布

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分类专栏： J2EE 文章标签： struts bean import html sqlserver action

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Struts分页

*********************************************************************************************************************

执行过程在这里说明一下

首先 http://localhost:xxxx/xxx/index.jsp

然后单击显示列表

会执行struts-config.xml 对应的 ation-mappings中action中的 path="/query" type="xxx.QueryAction"

转到对应的QueryAction.java

如果执行成功 QueryAction就会返回 mapping.findWorad("succecc");

再到struts-config.xml ation-mappings中action中的 path="/query" type="xxx.QueryAction"中的

跳转到query.jsp

query.jsp 遍历会话的集合来显示数据单击链接就会显示不同的内容

由于个人能力有限，如有不足，敬请谅解!!!!

*********************************************************************************************************************

重要用到ArrayList

Struts标签库logic /bean/html

模型PageBean

public class PageBean {

private int curPage;//当前是第几页

private int rowCount=5;//每页显示多少行

private int maxPage; //共有多少页

private int rowNum;//共有多少行信息

private ArrayList data;// 所有信息

private ArrayList pageData;当前页面显示信息

public int getCurPage(){

return curPage;

}

public void setCurPage(int curPage){

this.curPage=curPage;

}

public int getMaxPage(){

return maxPage;

}

public int getRowNum(){

return rowNum;

}

public void setRowNum(){

rowNum=data.size();

}

public void setMaxPage(){

if(data.size()%rowCount==0){

maxPage=data.size/rowCount;//如果没有余数，说明所有信息能在当前显示完

}else{

maxPage=data.size/rowCount+1;//如果有余数，说明所有信息不能在当前显示完，所以应加上一页才可以显示所有信息

}

public ArrayList getData(){

return data;

}

public void setData(ArrayList arrayList){

data=arrayList;

}

public ArrayList getPageData(){

return pageData;

}

public void setPageData(){

pageData=new ArrayList();

for(int i=rowCount*(curPage-1);i<rowCount*curPage;i++){

if(i==data.size()){

break;

}

pageData.add(data.get(i));

}

DataBaseOperator 执行数据库操作返回ArrayList集合为PageBean所用

import java.sql. * ;

import java.util. * ;

public class DataBaseOperator {

Connection conn = null;

Statement stmt = null;

PreparedStatement pstmt = null;

ResultSet rs = null;

public UserBean(DataSource ds){
    try{
      conn = ds.getConnection();
    }catch(SQLException e){
      e.printStackTrace();
    }
    }

public ArrayList selectemd()...{
        String strsql = " xxxxxx";
        ArrayList ay = new ArrayList();
        int i = 0;
        try...{
            xxx= conn.xxxxx();
            rs = xxx.executeQuery();          //返回记录集

            while(rs.next())...{
               xxxx qf = new xxx();               //定义一个bean和数据库对应字段
               qf.setId(rs.getInt(1));
                                  qf.setName(rs.getString(2));
                                 qf.setAge(rs.getInt(3));
                                 qf.setSex(rs.getString(4));
                                 qf.setDep(rs.getString(5));
                                 qf.setDepname(rs.getString(6));
                                 qf.setWork(rs.getString(7));
                                 qf.setWorkname(rs.getString(8));
               ay.add(i,qf);                     //将bean绑定到集合中
               i++;
           }
        }catch(SQLException e)...{
            e.printStackTrace();
        }
        return ay;                 //返回集合
    }
    .......
}

...............................

QueryAction.java

import java.util.ArrayList;

import java.util.HashMap;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.sql.DataSource;

import org.apache.struts.action.Action;

public class QueryAction extends Action {

// --------------------------------------------------------- Instance Variables

// --------------------------------------------------------- Methods

/**

* Method execute

* @param mapping

* @param form

* @param request

* @param response

* @return ActionForward

public ActionForward execute(

ActionMapping mapping,

ActionForm form,

HttpServletRequest request,

HttpServletResponse response) {

DataSource ds = getDataSource(request,"sql");

DataBaseOperator ob= new DataBaseOperator (ds);

ArrayList ay = ob.selectemd();

ob.close();

int curPage=1;

if(ay.size() > 0){

PageBean pb = new PageBean();

if(request.getParamter("curPage")!=null){

curPage=Integer.parserInt(request.getParamter("curPage"));

if(curPage==0){

curPage=1;

}

pb.setCurPage(curPage);

pb.setData(ay);

pb.setMaxPage();

pb.setRowNum();

request.getSession().setAttribute("pb",pb);

return mapping.findForward("success");

}

// TODO Auto-generated method stub

return null;

}

struts-config.xml

<? xml version="1.0" encoding="UTF-8" ?>

<! DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd" >

< struts-config >

< data-sources >

< data-source key ="sql" type ="org.apache.commons.dbcp.BasicDataSource" >

< set-property property ="password" value ="1973" />

< set-property property ="minCount" value ="" />

< set-property property ="maxCount" value ="" />

< set-property property ="username" value ="sa" />

< set-property property ="driverClassName" value ="com.microsoft.jdbc.sqlserver.SQLServerDriver" />

< set-property property ="description" value ="sqlserver" />

< set-property property ="url" value ="jdbc:microsoft:sqlserver://localhost:1433;databasename=xxx" />

< set-property property ="readOnly" value ="false" />

< set-property property ="autoCommit" value ="false" />

</ data-source >

</ data-sources >

......

< action-mappings >

< action path ="/query"

type ="com.xxx.QueryAction" >

< forward name ="success" path ="/query.jsp" />

</ action >

</ action-mappings >

............

</ struts-config >

index.jsp

<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html>
<head>


    <title>My JSP 'index.jsp' starting page</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">

    
</head>

<body>

    <html:link page="/query.do">
       显示列表
    </html:link>
</body>
</html:html>

query.jsp

<%@ page language="java" pageEncoding="gb2312"%>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>

<html>
<head>
  <title>JSP for queryForm form</title>
</head>
<body>
  <h1>列表
    </h1>
    <html:errors />