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

 1 /**
 2  * 用于分页显示
 3  * @author GXF
 4  *
 5  */
 6 public class Page {
 7     private int pageSize = 10;                    //每一页显示大小,默认为10
 8     private int totalNum;                        //记录总数
 9     private int pageNums;                        //一共有多少页
10     private int curPageNum;                        //当前页页号
11     
12     public int getPageSize() {
13         return pageSize;
14     }
15     public void setPageSize(int pageSize) {
16         this.pageSize = pageSize;
17     }
18     public int getTotalNum() {
19         return totalNum;
20     }
21     public void setTotalNum(int totalNum) {
22         this.totalNum = totalNum;
23     }
24     public int getPageNums() {
25         return pageNums;
26     }
27     public void setPageNums(int pageNums) {
28         this.pageNums = pageNums;
29     }
30     public int getCurPageNum() {
31         return curPageNum;
32     }
33     public void setCurPageNum(int curPageNum) {
34         this.curPageNum = curPageNum;
35     }
36     
37     
38     
39 }

Dao类的方法

 1 /**
 2      * 分页查询
 3      * @param page
 4      * @return
 5      */
 6     public List<Employee> queryEmployeeByPage(Page page){
 7         int total = getEmployeeTotalCount();
 8         page.setTotalNum(total);                                     //设置page总数
 9         
10         //设置页数
11         int pageNum = total / page.getPageSize();
12         if(total % page.getPageSize() != 0)
13             pageNum++;
14         page.setPageNums(pageNum);
15         
16         //开始查询的记录
17         int start = page.getCurPageNum() * page.getPageSize();
18         //显示最后一页内容
19         if(start >= total){
20             start = (page.getPageNums() - 1) * page.getPageSize();
21         }
22 
23         //开始查询
24         List<Employee> listOfEmployee = new ArrayList<Employee>();
25         Session session = baseDao.getSession();
26         session.beginTransaction();
27         String hql = "from Employee";
28         Query query = session.createQuery(hql);
29         query.setFirstResult(start);
30         query.setMaxResults(page.getPageSize());
31         listOfEmployee = query.list();
32         session.getTransaction().commit();
33         
34         session.close();
35         
36         return listOfEmployee;
37         
38     }

action类

 1 import java.util.List;
 2 import java.util.Map;
 3 
 4 import org.apache.struts2.interceptor.RequestAware;
 5 
 6 import com.gxf.IDao.IEmployeeDao;
 7 import com.gxf.entity.Employee;
 8 import com.gxf.util.Page;
 9 import com.opensymphony.xwork2.ActionSupport;
10 
11 /**
12  * 员工分页显示
13  * @author GXF
14  *
15  */
16 public class EmployeeAction extends ActionSupport implements RequestAware{
17     private Map<String, Object> request;
18     private IEmployeeDao employeeDao;
19     private Page page = new Page();
20     private int curPageNumber;
21     
22     /**
23      * 
24      */
25     private static final long serialVersionUID = 1L;
26 
27     public String queryAllEmployee(){
28         //设置好当前页码
29         page.setCurPageNum(curPageNumber);
30         
31         List<Employee> listOfEmployee = employeeDao.queryEmployeeByPage(page);
32         if(curPageNumber <= 0)
33             curPageNumber = 0;
34         if(curPageNumber >= page.getPageNums())
35             curPageNumber = page.getPageNums();
36         request.put("listOfEmployee", listOfEmployee);
37         for(int i = 0; i < listOfEmployee.size(); i++)
38             System.out.println(listOfEmployee.get(i).getName());
39         return SUCCESS;
40     }
41 
42     @Override
43     public void setRequest(Map<String, Object> request) {
44         this.request = request;    
45     }
46 
47     public IEmployeeDao getEmployeeDao() {
48         return employeeDao;
49     }
50 
51     public void setEmployeeDao(IEmployeeDao employeeDao) {
52         this.employeeDao = employeeDao;
53     }
54 
55     public Page getPage() {
56         return page;
57     }
58 
59     public void setPage(Page page) {
60         this.page = page;
61     }
62 
63     public int getCurPageNumber() {
64         return curPageNumber;
65     }
66 
67     public void setCurPageNumber(int curPageNumber) {
68         this.curPageNumber = curPageNumber;
69     }
70     
71 }

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