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JSP實(shí)現(xiàn)帶查詢條件的通用分頁組件

來源：本站原創(chuàng)|時(shí)間：2020-01-11|欄目：JSP編程|點(diǎn)擊： 次

分頁功能的代碼就是這樣的，在需要展示列表的頁面，我們基本都需要加上分頁功能，如果某天boss想要修改分頁功能的樣式，我們不能去一個(gè)一個(gè)的改吧。

下邊給大家分享一個(gè)自己封裝的通用分頁組件。

1. 效果展示

2. 使用方式

1 ）在需要顯示分頁信息的位置，直接引入pagination.jsp頁面。

<!-- 分頁內(nèi)容 -->
 <%@include file="/WEB-INF/decorators/pagination.jsp" %>
<!-- 分頁內(nèi)容結(jié)束 -->

2 ）在java代碼中

Controller層代碼：

@RequiresPermissions("func_vasadmin_userMoneyList")
@RequestMapping("/user/money/list")
public String list(Model model, ServletRequest request) {
 
 // 獲取所有的查詢條件參數(shù)（為了使用方便，所有查詢條件的參數(shù)命名前綴都是"search_"）
 Map<String, Object> searchParams = WebUtils.getParametersStartingWith(request, "search_");
 
 // 獲取分頁頁碼信息和每頁條數(shù)
 int pageNum = PageUtil.getTargetPage(request);
 int pageSize = PageUtil.getPageSize(request);
 Page page = new Page(pageSize, pageNum);
 
 // 查詢需要展示的內(nèi)容
 List<UserMoney> list = vasMoneyService.getUserMoneyList(page,searchParams);
 
 model.addAttribute("data", list);
 model.addAttribute("page", page);
 // 將搜索條件編碼成字符串，用于排序，分頁的URL
 model.addAttribute("searchParams", PageUtil.encodeParameterStringWithPrefix(searchParams, "search_"));
 
 return "vasadmin/user_money_list";
}

Service層代碼：

public List<UserMoney> getUserMoneyList(Page page,
 Map<String, Object> searchParams) {

 // 從map中獲取查詢條件
 long userId = (Long) DataConvertUtil.data2(searchParams.get("userId"),
 DataConvertUtil.DataType.LONG);
 long minMoney = (Long) DataConvertUtil.data2(
 searchParams.get("minMoney"), DataConvertUtil.DataType.LONG);
 long maxMoney = (Long) DataConvertUtil.data2(
 searchParams.get("maxMoney"), DataConvertUtil.DataType.LONG);

 // 查詢總條數(shù)
 int totleElements = vasMoneyDao.getUserMoneyListCount(
 DataBaseName.DB_TATA_MONEY, userId, minMoney, maxMoney);
 // 設(shè)置總條數(shù)
 page.setTotleElements(totleElements);

 // 查詢需要展示的數(shù)據(jù)
 return vasMoneyDao.getUserMoneyList(DataBaseName.DB_TATA_MONEY, userId,
 minMoney, maxMoney, page.getStartNum(), page.getEndNum());
}

**每次需要分頁，只需要操作上邊這兩步，是不是很簡(jiǎn)單啊~~。**接下來，給大家貼出封裝的pagination.jsp代碼，和其它的一些幫助類的代碼。

**3. 代碼示例 **

pagination.jsp （封裝的通用分頁代碼）

<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

<!-- 分頁信息 -->
<div class="row">
 <div class="col-md-3 page-number">
 每次顯示 <select class="form-control input-mini"
 onchange="self.location.href=options[selectedIndex].value">
 <option value="?pageNum=1&pageSize=10&${searchParams}"
 <c:if test="${page.pageSize eq '10' }">selected</c:if>>10</option>
 <option value="?pageNum=1&pageSize=50&${searchParams}"
 <c:if test="${page.pageSize eq '50' }">selected</c:if>>50</option>
 <option value="?pageNum=1&pageSize=100&${searchParams}"
 <c:if test="${page.pageSize eq '100' }">selected</c:if>>100</option>

 </select> 條
 </div>

 <div class="col-md-9 paging">
 <ul class="pagination">
 <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >共 ${page.totlePages} 頁，${page.totleElements}
 條</a></li>
 <c:if test="${page.hasPrevious == false}">
 <li class="disabled"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首頁</a></li>
 <li class="disabled"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上一頁</a></li>
 </c:if>
 <c:if test="${page.hasPrevious == true}">
 <li><a
 href="?pageNum=1&pageSize=${page.pageSize}&${searchParams}" rel="external nofollow" >首頁</a></li>
 <li><a
 href="?pageNum=${page.prePage}&pageSize=${page.pageSize}&${searchParams}" rel="external nofollow" >上一頁</a></li>
 </c:if>

 <c:forEach var="i" begin="${page.begin}" end="${page.end}">
 <c:choose>
 <c:when test="${i == page.pageNum}">
 <li class="active"><a
 href="?pageNum=${i}&pageSize=${page.pageSize}&${searchParams}" rel="external nofollow" rel="external nofollow" >${i}</a></li>
 </c:when>
 <c:otherwise>
 <li><a
 href="?pageNum=${i}&pageSize=${page.pageSize}&${searchParams}" rel="external nofollow" rel="external nofollow" >${i}</a></li>
 </c:otherwise>
 </c:choose>
 </c:forEach>
 <c:if test="${page.hasNext == true}">
 <li><a
 href="?pageNum=${page.nextPage}&pageSize=${page.pageSize}&${searchParams}" rel="external nofollow" >下一頁</a></li>
 <li><a
 href="?pageNum=${page.totlePages}&pageSize=${page.pageSize}&${searchParams}" rel="external nofollow" >末頁</a></li>
 </c:if>
 <c:if test="${page.hasNext == false}">
 <li class="disabled"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下一頁</a></li>
 <li class="disabled"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >末頁</a></li>
 </c:if>

 </ul>

 </div>
</div>
<!-- 分頁信息結(jié)束 -->

Page.java （分頁信息類）

public class Page implements Serializable {

 private static final long serialVersionUID = 1L;
 
 public Page(int pageSize, int pageNum) {
 if(pageSize > 0 ){
 this.pageSize = pageSize;
 }
 if(pageNum > 0){
 this.pageNum = pageNum;
 }
 }

 /**
 * 初始化各個(gè)值
 */
 public void initValue(){
 // 計(jì)算總共有多少頁
 totlePages = (int)Math.ceil(totleElements * 1.0 / pageSize);
 
 if(totlePages == 0){
 totlePages = 1;
 }
 
 // 頁碼矯正
 if(pageNum <= 0){
 pageNum = 1;
 }
 if(pageNum > totlePages){
 pageNum = totlePages;
 }
 
 // 是否有上一頁和首頁
 if(pageNum > 1){
 hasPrevious = true;
 prePage = pageNum - 1;
 }
 
 // 是否有下一頁和尾頁
 if(totlePages > pageNum){
 hasNext = true;
 nextPage = pageNum + 1;
 }
 
 // 分頁頁碼開始數(shù)值
 begin = Math.max(1, pageNum - paginationSize/2);
 
 // 分頁頁碼結(jié)束數(shù)值
 end = Math.min(begin + (paginationSize - 1), totlePages);
 }
 
 /**
 * 分頁下標(biāo)最多顯示多少頁
 */
 private int paginationSize = 10;
 /**
 * 頁碼開始
 */
 private int begin = 1;
 /**
 * 頁碼結(jié)束
 */
 private int end = 1;
 /**
 * 每頁顯示多少條
 */
 private int pageSize = 15;
 /**
 * 當(dāng)前頁碼
 */
 private int pageNum = 1;
 /**
 * 是否有下一頁
 */
 private boolean hasNext = false;
 /**
 * 是否有上一頁
 */
 private boolean hasPrevious = false;
 /**
 * 下一頁的頁碼
 */
 private int nextPage;
 /**
 * 上一頁的頁碼
 */
 private int prePage;
 /**
 * 總頁數(shù)
 */
 private int totlePages = 1;
 /**
 * 總條數(shù)
 */
 private int totleElements = 0;
 
 public static int maxNum = 999999;

 public int getPaginationSize() {
 return paginationSize;
 }
 public void setPaginationSize(int paginationSize) {
 this.paginationSize = paginationSize;
 }
 public int getBegin() {
 return begin;
 }
 public void setBegin(int begin) {
 this.begin = begin;
 }
 public int getEnd() {
 return end;
 }
 public void setEnd(int end) {
 this.end = end;
 }
 public int getPageSize() {
 return pageSize;
 }
 public void setPageSize(int pageSize) {
 this.pageSize = pageSize;
 }
 public int getPageNum() {
 return pageNum;
 }
 public void setPageNum(int pageNum) {
 this.pageNum = pageNum;
 }
 public boolean isHasNext() {
 return hasNext;
 }
 public void setHasNext(boolean hasNext) {
 this.hasNext = hasNext;
 }
 public boolean isHasPrevious() {
 return hasPrevious;
 }
 public void setHasPrevious(boolean hasPrevious) {
 this.hasPrevious = hasPrevious;
 }
 public int getNextPage() {
 return nextPage;
 }
 public void setNextPage(int nextPage) {
 this.nextPage = nextPage;
 }
 public int getPrePage() {
 return prePage;
 }
 public void setPrePage(int prePage) {
 this.prePage = prePage;
 }
 public int getTotlePages() {
 return totlePages;
 }
 public void setTotlePages(int totlePages) {
 this.totlePages = totlePages;
 }
 public int getTotleElements() {
 return totleElements;
 }
 public void setTotleElements(int totleElements) {
 this.totleElements = totleElements;
 // 知道總條數(shù)之后，初始化一下其它值
 initValue();
 }
 
 public static void main(String[] args) {
 System.out.println(Math.min(1, 2));
 }
 
 /**
 * 從第幾條開始查詢
 * @return
 */
 public int getStartNum(){
 return (pageNum -1) * pageSize + 1;
 }
 
 /**
 * 到第幾條結(jié)束
 * @return
 */
 public int getEndNum(){
 return pageNum * pageSize;
 }
}

PageUtil.java （分頁輔助類）

public class PageUtil implements Serializable {

 private static final long serialVersionUID = 1L;
 
 /**
 * 獲取目標(biāo)頁碼
 * @return
 */
 public static int getTargetPage(ServletRequest request){
 
 int pageNum = 0;
 
 String pageNumStr = request.getParameter("pageNum");
 
 if(StringUtils.isNotBlank(pageNumStr)){
 try{
 pageNum = Integer.valueOf(pageNumStr);
 }catch(Exception e){
 pageNum = 0;
 }
 }
 
 return pageNum;
 }
 
 /**
 * 獲取每頁條數(shù)
 * @return
 */
 public static int getPageSize(ServletRequest request){
 
 int pageSize = 0;
 
 String pageSizeStr = request.getParameter("pageSize");
 
 if(StringUtils.isNotBlank(pageSizeStr)){
 try{
 pageSize = Integer.valueOf(pageSizeStr);
 }catch(Exception e){
 pageSize = 0;
 }
 }
 
 return pageSize;
 }
 
 /**
 * 將Map中的查詢條件，加上前綴，以&拼接
 * @param map
 * @param prefix 每個(gè)參數(shù)的前綴
 * @return
 */
 public static String encodeParameterStringWithPrefix(Map<String,Object> map, String prefix){
 
 if(null == map || map.isEmpty()){
 return "";
 }
 
 StringBuffer sb = new StringBuffer();
 
 Iterator<Map.Entry<String,Object>> entries = map.entrySet().iterator();
 
 while (entries.hasNext()) {
 
 if(StringUtils.isNotEmpty(sb.toString())){
 sb.append("&");
 }
 
 Map.Entry<String,Object> entry = entries.next();
 
 sb.append(prefix);
 sb.append(entry.getKey());
 sb.append("=");
 sb.append(entry.getValue());
 
 } 
 
 return sb.toString();
 
 }

}

jsp頁面中查詢條件參數(shù)編寫示例如下：

<!-- 查詢條件 -->
<div class="col-md-10 search">

 <form class="form-inline" action="${ctx }/vasadmin/user/money/list"
 method="get">
 <div class="form-group">
 <input type="text" class="form-control input-sm"
 name="search_userId" value="${param.search_userId }"
 placeholder="用戶ID"
 onkeyup="this.value=this.value.replace(/\D/g,'')"
 onafterpaste="this.value=this.value.replace(/\D/g,'')">
 </div>
 <div class="form-group">
 <input type="text" class="form-control input-sm"
 name="search_minMoney" value="${param.search_minMoney }"
 placeholder="最小余額"
 onkeyup="this.value=this.value.replace(/\D/g,'')"
 onafterpaste="this.value=this.value.replace(/\D/g,'')">
 </div>
 <div class="form-group">
 <input type="text" class="form-control input-sm"
 name="search_maxMoney" value="${param.search_maxMoney }"
 placeholder="最大余額"
 onkeyup="this.value=this.value.replace(/\D/g,'')"
 onafterpaste="this.value=this.value.replace(/\D/g,'')">
 </div>
 <div class="form-group">
 <button type="submit" class="btn btn-primary btn-sm">
 <span class="glyphicon glyphicon-search"></span> 搜索
 </button>
 </div>
 </form>

</div>
<!-- /查詢條件 -->

源碼下載地址：分頁源碼

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