JSP实现带查询条件的通用分页组件(jsp实现查询)这样也行?

随心笔谈11个月前发布 admin
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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 class=”row”>
<div class=”col-md-3 page-number”>
每次显示 <select class=”form-control input-mini”
onchange=”self.location.href=https://www.jb51.net/article/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 class=”col-md-9 paging”>
<ul class=”pagination”>
<li><a href=”https://www.jb51.net/article/162094.htm#” >共 ${page.totlePages} 页,${page.totleElements}
条</a></li>
<c:if test=”${page.hasPrevious==false}”>
<li class=”disabled”><a href=”https://www.jb51.net/article/162094.htm#” >首页</a></li>
<li class=”disabled”><a href=”https://www.jb51.net/article/162094.htm#” >上一页</a></li>
</c:if>
<c:if test=”${page.hasPrevious==true}”>
<li><a
href=”https://www.jb51.net/article/?pageNum=1&pageSize=${page.pageSize}&${searchParams}” rel=”external nofollow” >首页</a></li>
<li><a
href=”https://www.jb51.net/article/?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=”${i==page.pageNum}”>
<li class=”active”><a
href=”https://www.jb51.net/article/?pageNum=${i}&pageSize=${page.pageSize}&${searchParams}” rel=”external nofollow” rel=”external nofollow” >${i}</a></li>
</c:when>
<c:otherwise>
<li><a
href=”https://www.jb51.net/article/?pageNum=${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=”https://www.jb51.net/article/?pageNum=${page.nextPage}&pageSize=${page.pageSize}&${searchParams}” rel=”external nofollow” >下一页</a></li>
<li><a
href=”https://www.jb51.net/article/?pageNum=${page.totlePages}&pageSize=${page.pageSize}&${searchParams}” rel=”external nofollow” >末页</a></li>
</c:if>
<c:if test=”${page.hasNext==false}”>
<li class=”disabled”><a href=”https://www.jb51.net/article/162094.htm#” rel=”external nofollow” rel=”external nofollow” rel=”external nofollow” rel=”external nofollow” rel=”external nofollow” >下一页</a></li>
<li class=”disabled”><a href=”https://www.jb51.net/article/162094.htm#” 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;
}
}

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);
}

private int paginationSize=10;

private int begin=1;

private int end=1;

private int pageSize=15;

private int pageNum=1;

private boolean hasNext=false;

private boolean hasPrevious=false;

private int nextPage;

private int prePage;

private int totlePages=1;

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));
}

public int getStartNum(){
return (pageNum -1) * pageSize + 1;
}

public int getEndNum(){
return pageNum * pageSize;
}
}

PageUtil.java (分页辅助类)

public class PageUtil implements Serializable {

private static final long serialVersionUID=1L;

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;
}

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;
}

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 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=”用户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=”${param.search_minMoney }”
placeholder=”最小余额”
onkeyup=”this.value=this.value.replace(/\D/g,”)”
onafterpaste=”this.value=this.value.replace(/\D/g,”)”>
</div>
<div class=”form-group”>
<input type=”text” class=”form-control input-sm”
name=”search_maxMoney” value=”${param.search_maxMoney }”
placeholder=”最大余额”
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>
<!– /查询条件 –>

源码下载地址:分页源码

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

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