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