struts2分页实现

1.定义一个page类，里面包括每一个的数量，当前页码，总记录数，等

2.将page对象传入dao中，dao输出分页查询好的数据。返回到action中，action放到request中，jsp从request中获取

3.jsp传一个curPageNum到action中，action设置好page对象，传给dao查询

page类

 /**
  * 用于分页显示
  * @author GXF
  *
  */
 public class Page {
     private int pageSize = 10;                    //每一页显示大小,默认为10
     private int totalNum;                        //记录总数
     private int pageNums;                        //一共有多少页
     private int curPageNum;                        //当前页页号

     public int getPageSize() {
         return pageSize;
     }
     public void setPageSize(int pageSize) {
         this.pageSize = pageSize;
     }
     public int getTotalNum() {
         return totalNum;
     }
     public void setTotalNum(int totalNum) {
         this.totalNum = totalNum;
     }
     public int getPageNums() {
         return pageNums;
     }
     public void setPageNums(int pageNums) {
         this.pageNums = pageNums;
     }
     public int getCurPageNum() {
         return curPageNum;
     }
     public void setCurPageNum(int curPageNum) {
         this.curPageNum = curPageNum;
     }

 }

Dao类的方法

 /**
      * 分页查询
      * @param page
      * @return
      */
     public List<Employee> queryEmployeeByPage(Page page){
         int total = getEmployeeTotalCount();
         page.setTotalNum(total);                                     //设置page总数

         //设置页数
         int pageNum = total / page.getPageSize();
         if(total % page.getPageSize() != 0)
             pageNum++;
         page.setPageNums(pageNum);

         //开始查询的记录
         int start = page.getCurPageNum() * page.getPageSize();
         //显示最后一页内容
         if(start >= total){
             start = (page.getPageNums() - 1) * page.getPageSize();
         }

         //开始查询
         List<Employee> listOfEmployee = new ArrayList<Employee>();
         Session session = baseDao.getSession();
         session.beginTransaction();
         String hql = "from Employee";
         Query query = session.createQuery(hql);
         query.setFirstResult(start);
         query.setMaxResults(page.getPageSize());
         listOfEmployee = query.list();
         session.getTransaction().commit();

         session.close();

         return listOfEmployee;

     }

action类

 import java.util.List;
 import java.util.Map;

 import org.apache.struts2.interceptor.RequestAware;

 import com.gxf.IDao.IEmployeeDao;
 import com.gxf.entity.Employee;
 import com.gxf.util.Page;
 import com.opensymphony.xwork2.ActionSupport;

 /**
  * 员工分页显示
  * @author GXF
  *
  */
 public class EmployeeAction extends ActionSupport implements RequestAware{
     private Map<String, Object> request;
     private IEmployeeDao employeeDao;
     private Page page = new Page();
     private int curPageNumber;

     /**
      *
      */
     private static final long serialVersionUID = 1L;

     public String queryAllEmployee(){
         //设置好当前页码
         page.setCurPageNum(curPageNumber);

         List<Employee> listOfEmployee = employeeDao.queryEmployeeByPage(page);
         if(curPageNumber <= 0)
             curPageNumber = 0;
         if(curPageNumber >= page.getPageNums())
             curPageNumber = page.getPageNums();
         request.put("listOfEmployee", listOfEmployee);
         for(int i = 0; i < listOfEmployee.size(); i++)
             System.out.println(listOfEmployee.get(i).getName());
         return SUCCESS;
     }

     @Override
     public void setRequest(Map<String, Object> request) {
         this.request = request;
     }

     public IEmployeeDao getEmployeeDao() {
         return employeeDao;
     }

     public void setEmployeeDao(IEmployeeDao employeeDao) {
         this.employeeDao = employeeDao;
     }

     public Page getPage() {
         return page;
     }

     public void setPage(Page page) {
         this.page = page;
     }

     public int getCurPageNumber() {
         return curPageNumber;
     }

     public void setCurPageNumber(int curPageNumber) {
         this.curPageNumber = curPageNumber;
     }

 }

JSP页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>employee分页显示实现</title>
</head>
<body>
    employeeList分页显示<br>
    <form action="#">
        <s:iterator value="#request.listOfEmployee" id="employee">
            <s:property value="#employee.name"/><br>
        </s:iterator>
        <br>
        <a href="queryEmployee?curPageNumber=0">首页</a>
        <a href="queryEmployee?curPageNumber=${curPageNumber-1} ">上一页</a>
        <a href="queryEmployee?curPageNumber=${curPageNumber+1}">下一页</a>
        <a href="queryEmployee?curPageNumber=<s:property value="page.pageNums"/>">尾页</a>
        一共<s:property value="page.pageNums"/>页
    </form>
</body>
</html>

效果