使用pager-taglib.jar实现分页

//1.导入pager-taglib.jar包；

//2.引入pager-taglib标签：<%@ taglib prefix="pg" uri="http://jsptags.com/tags/navigation/pager" %>

//3.建立PagerModel类：

public class PagerModel {

/**

* 总记录数

*/

private int total;

/**

* 当前页结果集

*/

private List datas;

public List getDatas() {

return datas;

}

public void setDatas(List datas) {

this.datas = datas;

}

public int getTotal() {

return total;

}

public void setTotal(int total) {

this.total = total;

}

}

//4.pager业务逻辑部分：

public class AbstractManager extends HibernateDaoSupport {

public PagerModel searchHql(String hql){

return searchHql(hql,null,SystemContext.getOffset(),SystemContext.getPageSize());

}

public PagerModel searchHql(String hql,Object datas){

return searchHql(hql,new Object[]{datas},SystemContext.getOffset(),SystemContext.getPageSize());

}

public PagerModel searchHql(String hql,Object[] datas){

return searchHql(hql,datas,SystemContext.getOffset(),SystemContext.getPageSize());

}

public PagerModel searchHql(String hql,int offset,int pageSize){

return searchHql(hql,null,offset,pageSize);

}

public PagerModel searchHql(String hql,Object datas,int offset,int pageSize){

return searchHql(hql,new Object[]{datas},offset,pageSize);

}

public PagerModel searchHql(String hql,Object[] datas,int offset,int pageSize){

String countHql = getQuery(hql);

Query query = getSession().createQuery(countHql);

if(datas !=null && datas.length > 0){

for(int i = 0 ; i<datas.length;i++)

query.setParameter(i, datas[i]);

}

int total = ((Long)query.uniqueResult()).intValue();

Query query1=getSession().createQuery(hql);

if(datas !=null && datas.length > 0){

for(int i = 0 ; i<datas.length;i++)

query1.setParameter(i, datas[i]);

}

List list =query1.setFirstResult(offset)
.setMaxResults(pageSize).list();

PagerModel pm = new PagerModel();

pm.setDatas(list);

pm.setTotal(total);

return pm;

}

public String getQuery(String hql){

int index =hql.indexOf("from");

if(index != -1){

return "select count(*)"+hql.substring(index);

}

throw new SystemException("查询语句出错！");

}

}

//5.定义offset、pagesize类：

public class SystemContext {

private static ThreadLocal offset = new ThreadLocal();

private static ThreadLocal pageSize = new ThreadLocal();

public static int getOffset(){

Integer os = (Integer)offset.get();

if(os == null){

return 0;

}

return os;

}

public static void setOffset(int offsetvalue){

offset.set(offsetvalue);

}

public static void removeOffset(){

offset.remove();

}

public static int getPageSize(){

Integer ps = (Integer)pageSize.get();

if(ps == null){

return Integer.MAX_VALUE;

}

return ps;

}

public static void setPageSize(int pageSizevalue){

pageSize.set(pageSizevalue);

}

public static void removePageSize(){

pageSize.remove();

}

}

//6.过滤器中初始化pagesize、offset：

public class PagerFilter implements Filter {

public void destroy() {

}

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain chain) throws IOException, ServletException {

HttpServletRequest httpRequest =(HttpServletRequest)request;

SystemContext.setOffset(getOffset(httpRequest));

SystemContext.setPageSize(getPageSize(httpRequest));

try{

chain.doFilter(request, response);

}finally{

//清空ThreadLocal中的值

SystemContext.removeOffset();

SystemContext.removePageSize();

}

}

public void init(FilterConfig arg0) throws ServletException {

}

public int getOffset(HttpServletRequest request){

int offset = 0;

try {

offset = Integer.parseInt(request.getParameter("pager.offset"));

} catch (NumberFormatException ignore) {

}

return offset;

}

//设置每页显示多少条记录

public int getPageSize(HttpServletRequest request){

return 3;

}

}

//7.配置过滤器web.xml中：

<filter>

<filter-name>pager-taglib</filter-name>

<filter-class>com.oa.util.filter.PagerFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>pager-taglib</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

//8.显示效果：

<pg:pager url="org.do" items="${pm.total }" export="currentPageNumber=pageNumber">

<pg:param name="parentId"/>

<pg:first>

<a href="${pageUrl}" mce_href="${pageUrl}">首页</a>

</pg:first>

<pg:prev>

<a href="${pageUrl }" mce_href="${pageUrl }">前页</a>

</pg:prev>

<pg:pages>

<c:choose>

<c:when test="${currentPageNumber eq pageNumber }">

<font color="red">${pageNumber }</font>

</c:when>

<c:otherwise>

<a href="${pageUrl }" mce_href="${pageUrl }">${pageNumber }</a>

</c:otherwise>

</c:choose>

</pg:pages>

<pg:next>

<a href="${pageUrl }" mce_href="${pageUrl }">后页</a>

</pg:next>

<pg:last>

<a href="${pageUrl }" mce_href="${pageUrl }">尾页</a>

</pg:last>

</pg:pager>

摘自：/article/5993525.html