java web分頁查詢初試

ssh2分頁查詢初試，放着記錄學習一下。

entity:student.java:

package com.zte.entity;

/**
 * 數據持久化，跟數據庫的的相應的表的字段是對應的。
 *
 *
 */
public class Student
{

    private Integer id;

    private String name;

    private Integer age;

    private Integer score;

    private String email;

    private String phone;

    public String getEmail()
    {
        return email;
    }

    public void setEmail(String email)
    {
        this.email = email;
    }

    public String getPhone()
    {
        return phone;
    }

    public void setPhone(String phone)
    {
        this.phone = phone;
    }

    public Integer getId()
    {
        return id;
    }

    public void setId(Integer id)
    {
        this.id = id;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public Integer getAge()
    {
        return age;
    }

    public void setAge(Integer age)
    {
        this.age = age;
    }

    public Integer getScore()
    {
        return score;
    }

    public void setScore(Integer score)
    {
        this.score = score;
    }

}

Student.hbm.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping package="com.zte.entity">
    <class name="Student" table="student">
        <id name="id" column="id" type="java.lang.Integer">
            <generator class="identity">
            </generator>
        </id>
        <property name="name" column="name" type="java.lang.String"></property>
        <property name="age" column="age" type="java.lang.Integer"></property>
        <property name="score" column="score" type="java.lang.Integer"></property>
        <property name="email" column="email" type="java.lang.String"></property>
        <property name="phone" column="phone" type="java.lang.String"></property>
    </class>
</hibernate-mapping>

dao層:StudentDao.java

public interface StudentDao<T>
{
    public QueryResult<T> getScrollData(int firstindex, int maxresult); // 獲得分頁記錄
}

StudentDaoImpl.java:

public class StudentImpl<T> implements StudentDao
{

    private SessionFactory sessionFactory;// 通過spring注入數據持久化工廠(相當於spring幫你設置好了
                                            // 對象，直接通過getter/setter的方式獲取)

    public SessionFactory getSessionFactory()
    {
        return sessionFactory;
    }

    public void setSessionFactory(SessionFactory sessionFactory)
    {
        this.sessionFactory = sessionFactory;
    }
      @Override
    public QueryResult getScrollData(int firstindex, int maxresult)
    {
        QueryResult retuslt = new QueryResult<T>();
        Query query =
                sessionFactory.getCurrentSession().createQuery("from Student");
        System.out.println("query---size---before>>>" + query.list().size());
        retuslt.setTotalrecord(query.list().size());
        query.setFirstResult(firstindex).setMaxResults(maxresult);
        System.out.println("query---size---after>>>" + query.list().size());
        retuslt.setResultlist(query.list());
        return retuslt;
    }

services層：

StudentService.java:

public interface StudentService<T>
{
    public QueryResult<T> getScrollData(int firstindex, int maxresult);
}

StudentServiceImpl.java:

public class StudentServiceImpl implements StudentService
{

    private StudentDao studentDao;// 通過spring的bean依賴注入對象
    public StudentDao getStudentDao()
    {
        return studentDao;
    }

    public void setStudentDao(StudentDao studentDao)
    {
        this.studentDao = studentDao;
    }
    @Override
    public QueryResult getScrollData(int firstindex, int maxresult)
    {
        return studentDao.getScrollData(firstindex, maxresult);
    }

Action:

BaseAction.java:

public class BaseAction extends ActionSupport implements ServletRequestAware,
        ServletResponseAware
{

    public Integer page; // 當前頁信息

    public String query; // 是否爲條件查詢

    HttpServletRequest request;

    HttpServletResponse response;

    public Integer getPage()
    {// 獲得當前頁信息
        return page = (page == null || page < 1) ? 1 : page;
    }

    public void setPage(Integer page)
    {// 設置當前頁信息
        this.page = page;
    }

    public String getQuery()
    {// 獲得query信息
        return query;
    }

    public void setQuery(String query)
    {// 設置query信息
        this.query = query;
    }

    @Override
    public void setServletResponse(HttpServletResponse arg0)
    {
        this.response = arg0;

    }

    @Override
    public void setServletRequest(HttpServletRequest arg0)
    {
        this.request = arg0;

    }

QueryAction.java

public class QueryAction extends BaseAction
{

    public StudentService studentService;

    public StudentService getStudentService()
    {
        return studentService;
    }

    public void setStudentService(StudentService studentService)
    {
        this.studentService = studentService;
    }

    public String query()
    {
        PageView<Student> pageView = new PageView<Student>(5, getPage());
        pageView.setQueryResult(studentService.getScrollData(
                pageView.getFirstResult(), pageView.getMaxresult()));// 查詢所有記錄
        request.setAttribute("pageView", pageView);// 保存到request範圍
        return this.SUCCESS;
    }
}

Util,分頁工具類：

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;
    }

    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);
    }
}

PageView.java:

public class PageView<T> {
    /** 分頁數據 **/
    private List<T> records;
    /** 頁碼開始索引和結束索引 **/
    private PageIndex pageindex;
    /** 總頁數 **/
    private long totalpage = 1;
    /** 每頁顯示記錄數 **/
    private int maxresult = 12;
    /** 當前頁 **/
    private int currentpage = 1;
    /** 總記錄數 **/
    private long totalrecord;
    /** 頁碼數量 **/
    private int pagecode = 10;
    /** 要獲取記錄的開始索引 **/
    public int getFirstResult() {
        return (this.currentpage-1)*this.maxresult;
    }
    public int getPagecode() {
        return pagecode;
    }

    public void setPagecode(int pagecode) {
        this.pagecode = pagecode;
    }

    public PageView(int maxresult, int currentpage) {
        this.maxresult = maxresult;
        this.currentpage = currentpage;
    }

    public void setQueryResult(QueryResult<T> qr){
        setTotalrecord(qr.getTotalrecord());
        setRecords(qr.getResultlist());
    }

    public long getTotalrecord() {
        return totalrecord;
    }
    public void setTotalrecord(long totalrecord) {
        this.totalrecord = totalrecord;
        setTotalpage(this.totalrecord%this.maxresult==0? this.totalrecord/this.maxresult : this.totalrecord/this.maxresult+1);
    }
    public List<T> getRecords() {
        return records;
    }
    public void setRecords(List<T> records) {
        this.records = records;
    }
    public PageIndex getPageindex() {
        return pageindex;
    }
    public long getTotalpage() {
        return totalpage;
    }
    public void setTotalpage(long totalpage) {
        this.totalpage = totalpage;
        this.pageindex = PageIndex.getPageIndex(pagecode, currentpage, totalpage);
    }
    public int getMaxresult() {
        return maxresult;
    }
    public int getCurrentpage() {
        return currentpage;
    }

QueryResult.java，數據集

/**
 * 分頁實體類封裝
 *
 */
public class QueryResult<T> {
    /** 獲得結果集 **/
    private List<T> resultlist;
    /** 獲得總的記錄數 **/
    private long totalrecord;

    public List<T> getResultlist() {
        return resultlist;
    }
    public void setResultlist(List<T> resultlist) {
        this.resultlist = resultlist;
    }
    public long getTotalrecord() {
        return totalrecord;
    }
    public void setTotalrecord(long totalrecord) {
        this.totalrecord = totalrecord;
    }
}

分頁jsp：

<%@ page language="java" pageEncoding="GB18030"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<font color="blue"> 當前頁:第${pageView.currentpage}頁 |
    總記錄數:${pageView.totalrecord}條 | 每頁顯示:${pageView.maxresult}條 |
    總頁數:${pageView.totalpage}頁</font>
<c:forEach begin="${pageView.pageindex.startindex}"
    end="${pageView.pageindex.endindex}" var="wp">
    <c:if test="${pageView.currentpage==wp}">
        <b><font color="red">第${wp}頁</font></b>
    </c:if>
    <c:if test="${pageView.currentpage!=wp}">
        <a href="javascript:topage('${wp}')" class="a03">第${wp}頁</a>
    </c:if>
</c:forEach>

分頁的頁面：

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript">
    //到指定的分頁頁面
    function topage(page) {
        var form = document.forms[0];
        form.page.value = page;
        form.submit();
    }
</script>
</head>
<body>
    <form action="queryAction" method="post">
        <s:hidden name="page" />
        <s:hidden name="id" />
        <s:hidden name="name" />
        <s:hidden name="phone" />
        <s:hidden name="email" />
        <s:hidden name="age" />
        <s:hidden name="score" />
        <table width="800" border="0" cellPadding="0" cellSpacing="1"
            bgcolor="#6386d6">
            <!-- 列表標題欄 -->
            <tr bgcolor="#EFF3F7" class="TableBody1">
                <td width="10%" height="37" align="center"><b>客戶編號</b></td>
                <td width="10%" height="37" align="center"><B>客戶名稱</B></td>
                <td width="18%" height="37" align="center"><b>聯繫電話</b></td>
                <td width="18%" height="37" align="center"><b>聯繫地址</b></td>
                <td width="18%" height="37" align="center"><b>聯繫人</b></td>
                <td width="18%" height="37" align="center"><b>其他信息</b></td>
                <td width="10%" height="37" align="center"><b>操作</b></td>
            </tr>
            <!-- 列表數據欄 -->
            <s:if
                test="null != #request.pageView.records && !#request.pageView.records.isEmpty() ">
                <s:iterator value="#request.pageView.records" id="entity">
                    <tr bgcolor="#EFF3F7" class="TableBody1"
                        onmouseover="this.bgColor = '#DEE7FF';"
                        onmouseout="this.bgColor='#EFF3F7';">
                        <td align="center" vAlign="center">${entity.id }</td>
                        <td align="center" vAlign="center">${entity.name }</td>
                        <td align="center" vAlign="center">${entity.phone }</td>
                        <td align="center" vAlign="center">${entity.email }</td>
                        <td align="center" vAlign="center">${entity.age }</td>
                        <td align="center" vAlign="center">${entity.score }</td>
                        <td align="center" vAlign="center"><a href="#"
                            onclick="del('customermanage_del.do?customerNO=${entity.id}');">刪除</a>
                            <a href="#"
                            onclick="openWin('customermanage_updateUI.do?customerNO=${entity.id}','addperson',600,200);">修改</a>
                        </td>
                    </tr>
                </s:iterator>
            </s:if>
            <!-- 在列表數據爲空的時候，要顯示的提示信息 -->
            <s:else>
                <tr>
                    <td colspan="7" align="center" bgcolor="#EFF3F7" class="TableBody1"
                        onmouseover="this.bgColor = '#DEE7FF';"
                        onmouseout="this.bgColor='#EFF3F7';">沒有找到相應的記錄</td>
                </tr>
            </s:else>
        </table>
        <TABLE width="778" border=0 align=left cellPadding=0 cellSpacing=0
            borderColor=#ffffff style="FONT-SIZE: 10pt">
            <TBODY>
                <TR>
                    <TD height=28 align=right vAlign=center noWrap
                        background="images/list_middle.jpg">   <!-- 可以在這裏插入分頁導航條 -->
                        <%@ include file="fenye.jsp"%>
                    </TD>
                </TR>
            </TBODY>
        </TABLE>
    </form>
</body>
</html>

效果如圖：

原文鏈接：http://blog.csdn.net/csh159/article/details/9223293