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import java.util.List;

public class PageView {

// 通過參數(shù)指定的信息

private int currentPage;// 當前頁碼

private int pageSzie;// 每頁顯示記錄數(shù)量

// 通過查詢數(shù)據(jù)庫獲取的信息，外部獲取

private int recordTotal;// 總記錄數(shù)

private List recordList;// 當前面記錄信息列表

// 通過計算生成的信息

private int pageTotal;// 總頁面數(shù)量

private int startIndex;// 起始頁面索引

private int endIndex;// 結束頁面索引

// 顯示的頁面數(shù)量

private static final int PAGE_INDEX_COUNT = 10;

// 在構造方法中生成各種需要的信息

public PageView(int currentPage, int pageSize, int recordTotal,

List recordList) {

this.currentPage = currentPage;

this.pageSzie = pageSize;

this.recordTotal = recordTotal;

this.recordList = recordList;

// 通過計算生成startIndex和endIndex

/*

* 因為顯示的頁面索引數(shù)量是有限的 我們不能把所以的頁面索引一下子全列出來 我們需要動態(tài)顯示頁面索引列表

*/

this.pageTotal = (this.recordTotal + this.pageSzie - 1) / this.pageSzie;

// 如果頁面總數(shù)<=顯示頁面索引數(shù)量

if (this.pageTotal <= PAGE_INDEX_COUNT) {

this.startIndex = 1;

this.endIndex = this.pageTotal;

} else {

// 根據(jù)當前頁面索引生成，頁面起始索引和結束索引。

// 區(qū)分偶數(shù)和奇數(shù) 頁面索引數(shù)量

if (PAGE_INDEX_COUNT % 2 == 0) {

this.startIndex = this.currentPage - (PAGE_INDEX_COUNT / 2 - 1);

this.endIndex = this.currentPage + (PAGE_INDEX_COUNT / 2);

} else {

this.startIndex = this.currentPage - (PAGE_INDEX_COUNT / 2);

this.endIndex = this.currentPage + (PAGE_INDEX_COUNT / 2);

}

// 如果生成的起始索引小于1

if(this.startIndex < 1){

this.startIndex = 1;

this.endIndex = PAGE_INDEX_COUNT;

}

// 如果生成的結束索引大于總頁面索引數(shù)量

if(this.endIndex > this.pageTotal){

this.endIndex = this.pageTotal;

this.startIndex = this.pageTotal - PAGE_INDEX_COUNT;

}

}

}

// ...getters AND setters

}

/** 

 * 顯示審批流程列表 

 */

public ActionForward list(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)

throws Exception {

int pageNum = Integer.parseInt(request.getParameter("pageNum"));

// 調用ProcessDefinitionService接口的getPageView方法獲取PageView對象

PageView pageView = processDefinitionService.getPageView(pageNum);

// 將PageView對象存放到request的pageView屬性中

request.setAttribute("pageView", pageView);

return mapping.findForward("list"); // list.jsp

}

/**

 * 獲取pageView信息

 */

public PageView getPageView(int pageNum) {

// 每面顯示10條記錄

int pageSize = 10;

// 查詢數(shù)據(jù)庫

// 使用Number防止不同數(shù)據(jù)庫返回的數(shù)值類型不同，而引發(fā)的異常。

int count = ((Number) this.getSession().createQuery(

"SELECT COUNT(*) FROM " + ProcessDefinition.class.getName()

+ " pd").uniqueResult()).intValue();

// 第一條記錄的索引

int firstRecoderIndex = (pageNum - 1) * pageSize;

// 獲取記錄列表

List list = this.getSession().createQuery(

"FROM " + ProcessDefinition.class.getName() + " pd")

.setFirstResult(firstRecoderIndex).setMaxResults(pageSize)

.list();

return new PageView(pageNum, pageSize, count, list);

}

<%@ page language="java" pageEncoding="utf-8" %>

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

<c:if test="${pageView.totalPage gt 1 }">

<!-- 分頁信息 -->

頁碼：${pageView.currentPage}/${pageView.totalPage}頁

每頁顯示：${pageView.pageSize}條

總記錄數(shù)：${pageView.recordCount}條

分頁：

<a href="javascript:gotoPage(1)">[首頁]</a> 

<c:if test="${pageView.currentPage gt 1}">

<a href="javascript:gotoPage(${pageView.currentPage - 1})">[上一頁]</a> 

</c:if>

<c:if test="${pageView.currentPage lt pageView.totalPage}">

<a href="javascript:gotoPage(${pageView.currentPage + 1})">[下一頁]</a> 

</c:if>

<a href="javascript:gotoPage(${pageView.totalPage})">[尾頁]</a>

<!-- 顯示頁碼 -->

<c:forEach begin="${pageView.startPageIndex}" end="${pageView.endPageIndex}" var="pageNum">

<c:if test="${pageNum eq pageView.currentPage}">

<span class="current_page">${pageNum}</span>

</c:if>

<c:if test="${pageNum ne pageView.currentPage}">

<a href="javascript:gotoPage(${pageNum})">${pageNum}</a>

</c:if>

</c:forEach>

轉到：

<input type="text" id="txtPageNum" size="4" class="input_pagenum"/>

<input type="button" onclick="gotoPage(document.getElementById('txtPageNum').value)" value="Go"/>

<script type="text/javascript">

/**

* 跳轉到指定的頁碼

*/

function gotoPage( pageNum ){

if( isNaN(pageNum) ){ // not a number

alert("請輸入正確的頁碼");

document.getElementById('txtPageNum').focus();

return false;

}

if( pageNum < 1 || pageNum > ${pageView.totalPage} ){

alert("請輸入正確的頁碼，范圍為 1-${pageView.totalPage}");

document.getElementById('txtPageNum').focus();

return false;

}

window.location.href = getPageViewUrl( pageNum );

// getPageViewUrl為在include頁面添加的javscript代碼，

     // 所以此頁面可以適用于任何分頁信息的顯示。例如下：

//function getPageViewUrl( pageNum ){

// return "?method=list&pageNum=" + pageNum;

//}

}

</script>

</c:if>

/** 

 * 部署流程頁面 

 */

public ActionForward deployUI(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)

throws Exception {

return mapping.findForward("deployUI"); // deployUI.jsp

}

/** 

 * 部署流程 

 */

public ActionForward deploy(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)

throws Exception {

try {

// 獲取<html:file>表單提交過來的流程資源

ProcessDefinitionActionForm adaf = (ProcessDefinitionActionForm) form;

ZipInputStream zipIn = new ZipInputStream(adaf.getParResource().getInputStream());

// 創(chuàng)建流程定義

ProcessDefinition pd = ProcessDefinition.parseParZipInputStream(zipIn);

// 部署流程定義

this.processDefinitionService.deploy(pd);

} catch (Exception e) {

// 發(fā)生異常顯示錯誤

ActionErrors errors = new ActionErrors();

errors.add("error", new ActionMessage("非法的文件格式！",false));

this.saveErrors(request, errors);

return mapping.findForward("deployUI");

}

return mapping.findForward("toList"); // path="/pd.do?method=list" redirect="true"

}

/**

 * 刪除流程

 */

public ActionForward del(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

// 獲取流程ID并刪除

Long id = Long.parseLong(request.getParameter("id"));

this.processDefinitionService.delete(id);

// 需要刷新流程顯示列表

String pageNum = request.getParameter("pageNum");

ActionForward af = mapping.findForward("toList");

return new ActionForward(af.getPath() + "&pageNum=" + pageNum, af.getRedirect());

}

/**

 * 查詢流程定義文件（processdefinition.xml）

 */

public ActionForward showProcessFile(ActionMapping mapping,

ActionForm form, HttpServletRequest request,

HttpServletResponse response) throws Exception {

// 獲取流程id

Long id = Long.parseLong(request.getParameter("id"));

// 獲取流程定義

ProcessDefinition pd = this.processDefinitionService.getById(id);

// 獲取文件

byte[] content = pd.getFileDefinition().getBytes(

"processdefinition.xml");

// 寫出文件

response.setContentType("text/xml;charset=UTF-8");

response.getWriter().write(new String(content, "UTF-8"));

return null;

}

/**

 * 查詢流程圖片（processimage.jpg）

 */

public ActionForward showProcessImage(ActionMapping mapping,

ActionForm form, HttpServletRequest request,

HttpServletResponse response) throws Exception {

// 獲取流程id

Long id = Long.parseLong(request.getParameter("id"));

// 獲取流程定義

ProcessDefinition pd = this.processDefinitionService.getById(id);

// 獲取文件

byte[] content = pd.getFileDefinition().getBytes("processimage.jpg");

// 寫出文件

response.setContentType("image/jpeg");

response.getOutputStream().write(content);

return null;

}