JSP实现带查询条件的通用分页组件

分页功能的代码就是这样的，在需要展示列表的页面，我们基本都需要加上分页功能，如果某天boss想要修改分页功能的样式，我们不能去一个一个的改吧。

下边给大家分享一个自己封装的通用分页组件。

1. 效果展示

2. 使用方式

1 ）在需要显示分页信息的位置，直接引入pagination.jsp页面。

<!-- 分页内容 --> <%@include file="/WEB-INF/decorators/pagination.jsp" %><!-- 分页内容结束 -->

2 ）在java代码中

Controller层代码：

@RequiresPermissions("func_vasadmin_userMoneyList")@RequestMapping("/user/money/list")public String list(Model model, ServletRequest request) {  // 获取所有的查询条件参数（为了使用方便，所有查询条件的参数命名前缀都是"search_"） Map<String, Object> searchParams = WebUtils.getParametersStartingWith(request, "search_");  // 获取分页页码信息和每页条数 int pageNum = PageUtil.getTargetPage(request); int pageSize = PageUtil.getPageSize(request); Page page = new Page(pageSize, pageNum);  // 查询需要展示的内容 List<UserMoney> list = vasMoneyService.getUserMoneyList(page,searchParams);  model.addAttribute("data", list); model.addAttribute("page", page); // 将搜索条件编码成字符串，用于排序，分页的URL model.addAttribute("searchParams", PageUtil.encodeParameterStringWithPrefix(searchParams, "search_"));  return "vasadmin/user_money_list";}

Service层代码：

public List<UserMoney> getUserMoneyList(Page page, Map<String, Object> searchParams) { // 从map中获取查询条件 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); // 查询总条数 int totleElements = vasMoneyDao.getUserMoneyListCount( DataBaseName.DB_TATA_MONEY, userId, minMoney, maxMoney); // 设置总条数 page.setTotleElements(totleElements); // 查询需要展示的数据 return vasMoneyDao.getUserMoneyList(DataBaseName.DB_TATA_MONEY, userId, minMoney, maxMoney, page.getStartNum(), page.getEndNum());}

**每次需要分页，只需要操作上边这两步，是不是很简单啊~~。**接下来，给大家贴出封装的pagination.jsp代码，和其它的一些帮助类的代码。

**3. 代码示例 **

pagination.jsp （封装的通用分页代码）

<%@ 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" %><!-- 分页信息 --><div> <div> 每次显示 <select 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> 条 </div> <div> <ul> <li><a href="#" >共 ${page.totlePages} 页，${page.totleElements} 条</a></li> <c:if test="${page.hasPrevious == false}"> <li><a href="#" >首页</a></li> <li><a href="#" >上一页</a></li> </c:if> <c:if test="${page.hasPrevious == true}"> <li><a href="?pageNum=1&pageSize=${page.pageSize}&${searchParams}" rel="external nofollow" >首页</a></li> <li><a href="?pageNum=${page.prePage}&pageSize=${page.pageSize}&${searchParams}" rel="external nofollow" >上一页</a></li> </c:if> <c:forEach var="i" begin="${page.begin}" end="${page.end}"> <c:choose> <c:when test="${i == page.pageNum}"> <li><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" >下一页</a></li> <li><a href="?pageNum=${page.totlePages}&pageSize=${page.pageSize}&${searchParams}" rel="external nofollow" >末页</a></li> </c:if> <c:if test="${page.hasNext == false}"> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下一页</a></li> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >末页</a></li> </c:if> </ul> </div></div><!-- 分页信息结束 -->

Page.java （分页信息类）

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; } } /** * 初始化各个值 */ public void initValue(){ // 计算总共有多少页 totlePages = (int)Math.ceil(totleElements * 1.0 / pageSize);  if(totlePages == 0){ totlePages = 1; }  // 页码矫正 if(pageNum <= 0){ pageNum = 1; } if(pageNum > totlePages){ pageNum = totlePages; }  // 是否有上一页和首页 if(pageNum > 1){ hasPrevious = true; prePage = pageNum - 1; }  // 是否有下一页和尾页 if(totlePages > pageNum){ hasNext = true; nextPage = pageNum + 1; }  // 分页页码开始数值 begin = Math.max(1, pageNum - paginationSize/2);  // 分页页码结束数值 end = Math.min(begin + (paginationSize - 1), totlePages); }  /** * 分页下标最多显示多少页 */ private int paginationSize = 10; /** * 页码开始 */ private int begin = 1; /** * 页码结束 */ private int end = 1; /** * 每页显示多少条 */ private int pageSize = 15; /** * 当前页码 */ private int pageNum = 1; /** * 是否有下一页 */ private boolean hasNext = false; /** * 是否有上一页 */ private boolean hasPrevious = false; /** * 下一页的页码 */ private int nextPage; /** * 上一页的页码 */ private int prePage; /** * 总页数 */ private int totlePages = 1; /** * 总条数 */ 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; // 知道总条数之后，初始化一下其它值 initValue(); }  public static void main(String[] args) { System.out.println(Math.min(1, 2)); }  /** * 从第几条开始查询 * @return */ public int getStartNum(){ return (pageNum -1) * pageSize + 1; }  /** * 到第几条结束 * @return */ public int getEndNum(){ return pageNum * pageSize; }}

PageUtil.java （分页辅助类）

public class PageUtil implements Serializable { private static final long serialVersionUID = 1L;  /** * 获取目标页码 * @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; }  /** * 获取每页条数 * @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; }  /** * 将Map中的查询条件，加上前缀，以&拼接 * @param map * @param prefix 每个参数的前缀 * @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页面中查询条件参数编写示例如下：

<!-- 查询条件 --><div> <form action="${ctx }/vasadmin/user/money/list" method="get"> <div> <input type="text" name="search_userId" value="${param.search_userId }" placeholder="用户ID" onkeyup="this.value=this.value.replace(/\D/g,"")" onafterpaste="this.value=this.value.replace(/\D/g,"")"> </div> <div> <input type="text" name="search_minMoney" value="${param.search_minMoney }" placeholder="最小余额" onkeyup="this.value=this.value.replace(/\D/g,"")" onafterpaste="this.value=this.value.replace(/\D/g,"")"> </div> <div> <input type="text" name="search_maxMoney" value="${param.search_maxMoney }" placeholder="最大余额" onkeyup="this.value=this.value.replace(/\D/g,"")" onafterpaste="this.value=this.value.replace(/\D/g,"")"> </div> <div> <button type="submit"> <span></span> 搜索 </button> </div> </form></div><!-- /查询条件 -->

源码下载地址：分页源码

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