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 class=\”row\”>
<div class=\”col-md-3 page-number\”>
每次显示 <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> 条
</div>

<div class=\”col-md-9 paging\”>
<ul class=\”pagination\”>
<li><a href=\”#\” >共 ${page.totlePages} 页，${page.totleElements}
条</a></li>
<c:if test=\”${page.hasPrevious == false}\”>
<li class=\”disabled\”><a href=\”#\” >首页</a></li>
<li class=\”disabled\”><a href=\”#\” >上一页</a></li>
</c:if>
<c:if test=\”${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=\”${i == page.pageNum}\”>
<li class=\”active\”><a
href=\”?pageNum=${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 class=\”disabled\”><a href=\”#\” 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=\”#\” 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 class=\”col-md-10 search\”>