如何在Struts中实现分页显示数据(2)

如何在Struts中实现分页显示数据(2)

      由于篇幅较长，所以分开两篇来写。下面是我的一个实际例子，从数据库中分页获取管理员的数据，然后在JSP页面上表示出来。
      我的Action的代码：

 1 import java.util.List;
 2 import javax.servlet.http. * ;
 3
 4 import org.apache.struts.action. * ;
 5
 6 import xxx.Administrator;
 7 import xxx.TurnPageForm;
 8 import xxx.PageData;
 9
10 /**/ /**
11 * <p>Title: </p>
12 *
13 * <p>Description: </p>
14 *
15 * <p>Copyright: Copyright (c) 2003</p>
16 *
17 * <p>Company: </p>
18 *
19 * @author George Hill
20 * @version 1.0
21 */
22
23 public   class  AdminListAction extends Action  {
24
25  private static final int NUMBER = 15;
26
27  /**//**
28   * 执行管理员列表操作
29   * @param mapping ActionMapping
30   * @param form ActionForm
31   * @param request HttpServletRequest
32   * @param response HttpServletResponse
33   * @throws Exception
34   * @return ActionForward
35   */
36  public ActionForward execute(ActionMapping mapping, ActionForm form,
37                               HttpServletRequest request,
38                               HttpServletResponse response) throws Exception {
39    HttpSession session = request.getSession();
40
41    //获取页码
42    String pageStr = request.getParameter("page");
43    if (pageStr == null)
44      pageStr = String.valueOf(session.getAttribute("page"));
45    else
46      session.setAttribute("page", pageStr);
47    int page = 1;
48    try {
49      page = Integer.parseInt(pageStr);
50    } catch (NumberFormatException nfe) {
51    }
52
53    //获得总记录数
54    int count = Administrator.countAllAdministrators();
55    int maxPage = count / NUMBER;
56    if (count % NUMBER != 0)
57      maxPage++;
58
59    //获得列表
60    List list = Administrator.getAdministrators(NUMBER, (page - 1) * NUMBER);
61
62    if (count != 0 && list == null)
63      list = Administrator.getAdministrators(NUMBER, 0);
64
65    if (list != null) {
66      PageData data = new PageData(list, page, maxPage);
67
68      request.setAttribute("admins", data);
69    }
70
71    //分页部分
72    TurnPageForm tform = new TurnPageForm();
73    tform.setCurrentPage(page);
74    tform.setMaxPage(maxPage);
75    request.setAttribute("turnPageForm", tform);
76
77    return mapping.findForward("list");
78  }
79}
80

      JSP页面部分的代码片断：

 1      < logic:present  name ="admins" >
 2        < table  width ="90%"  border ="0"  align ="center"  cellpadding ="0"  cellspacing ="1"  class ="table6" >
 3          < tr  align ="center"  class ="table4" >
 4            < td  width ="10%"  height ="18"  align ="center"  nowrap class ="head1" >< bean:message  key ="list.index" /></ td >
 5            < td  width ="20%"  class ="head1"  align ="center"  nowrap >< bean:message  key ="admin.account" /></ td >
 6            < td  width ="30%"  class ="head1"  align ="center"  nowrap >< bean:message  key ="admin.name" /></ td >
 7            < td  width ="10%"  class ="head1"  align ="center"  nowrap >< bean:message  key ="admin.status" /></ td >
 8            < td  width ="30%"  class ="head1"  align ="center"  nowrap >< bean:message  key ="list.action" /></ td >
 9          </ tr >
10        < logic:iterate  name ="admins"  property ="list"  id ="entry"  indexId ="index" >
11          < tr  class ="table5"  onmouseover ="changeColor(this, '#99CCFF')"  onmouseout ="changeColor(this, '#F2F3F4')" >
12            < td  align ="center"  nowrap >< bean:write  name ="index" /></ td >
13            < td  align ="center"  nowrap >< bean:write  name ="entry"  property ="account" /></ td >
14            < td  align ="center"  nowrap >< bean:write  name ="entry"  property ="name" /></ td >
15          < logic:equal  name ="entry"  property ="status"  value ="true" >
16            < td  align ="center"  nowrap >< bean:message  key ="status.enable" /></ td >
17            < td  align ="center"  nowrap >
18              < html:link  page ="/disableAdmin.do?status=false"  paramId ="account"  paramName ="entry"  paramProperty ="account"  onclick ="return MM_popupDisableMsg()" >
19                < font  color ="red" >< bean:message  key ="status.disable" /></ font >
20              </ html:link >
21              < html:link  page ="/modifyAdmin.do?action=link"  paramId ="account"  paramName ="entry"  paramProperty ="account" >
22                < bean:message  key ="action.modify" />
23              </ html:link >
24              < html:link  action ="/deleteAdmin"  paramId ="account"  paramName ="entry"  paramProperty ="account"  onclick ="return MM_popupDelMsg()" >
25                < font  color ="red" >< bean:message  key ="action.delete" /></ font >
26              </ html:link >
27            </ td >
28          </ logic:equal >
29          < logic:equal  name ="entry"  property ="status"  value ="false" >
30            < td  align ="center"  nowrap >< font  color ="red" >< bean:message  key ="status.disable" /></ font ></ td >
31            < td  align ="center"  nowrap >
32              < html:link  page ="/enableAdmin.do?status=true"  paramId ="account"  paramName ="entry"  paramProperty ="account" >
33                < bean:message  key ="status.enable" />
34              </ html:link >
35              < html:link  page ="/modifyAdmin.do?action=link"  paramId ="account"  paramName ="entry"  paramProperty ="account" >
36                < bean:message  key ="action.modify" />
37              </ html:link >
38              < html:link  action ="/deleteAdmin"  paramId ="account"  paramName ="entry"  paramProperty ="account"  onclick ="return MM_popupDelMsg()" >
39                < font  color ="red" >< bean:message  key ="action.delete" /></ font >
40              </ html:link >
41            </ td >
42          </ logic:equal >
43          </ tr >
44        </ logic:iterate >
45        </ table >
46        < table  width ="90%"  border ="0"  align ="center"  cellpadding ="3"  cellspacing ="0" >
47          < tr >
48            < td  align ="left" ></ td >
49          < html:form  action ="/turnPage"  method ="POST" >
50            < td  align ="right"  nowrap >
51              < html:hidden  property ="url"  value ="/listAdmin.do" />
52              < html:hidden  property ="currentPage" />
53              < html:hidden  property ="maxPage" />
54              < bean:message  key ="page.the" />
55              < bean:write  name ="admins"  property ="page" />
56              < bean:message  key ="page.page" /> /
57              < bean:message  key ="page.all" />< bean:write  name ="admins"  property ="maxPage" />< bean:message  key ="page.page" />
58              < bean:message  key ="page.turn" />
59            < logic:equal  name ="admins"  property ="maxPage"  value ="1" >
60              < html:text  property ="page"  styleClass ="input_log"  styleId ="page"  size ="3"  value =""  disabled ="true" />
61              < html:submit  property ="turn"  styleClass ="t_input"  styleId ="turn"  value ="GO"  disabled ="true" />
62            </ logic:equal >
63            < logic:notEqual  name ="admins"  property ="maxPage"  value ="1" >
64              < html:text  property ="page"  styleClass ="input_log"  styleId ="page"  size ="3"  value ="" />
65              < html:submit  property ="turn"  styleClass ="t_input"  styleId ="turn"  value ="GO" />
66            </ logic:notEqual >
67            < logic:equal  name ="admins"  property ="firstPage"  value ="true" >
68              < html:submit  property ="first"  styleClass ="t_input"  styleId ="first"  disabled ="true" >< bean:message  key ="page.first" /></ html:submit >
69              < html:submit  property ="preview"  styleClass ="t_input"  styleId ="preview"  disabled ="true" >< bean:message  key ="page.previous" /></ html:submit >
70            </ logic:equal >
71            < logic:notEqual  name ="admins"  property ="firstPage"  value ="true" >
72              < html:submit  property ="first"  styleClass ="t_input"  styleId ="first" >< bean:message  key ="page.first" /></ html:submit >
73              < html:submit  property ="preview"  styleClass ="t_input"  styleId ="preview" >< bean:message  key ="page.previous" /></ html:submit >
74            </ logic:notEqual >
75            < logic:equal  name ="admins"  property ="lastPage"  value ="true" >
76              < html:submit  property ="next"  styleClass ="t_input"  styleId ="next"  disabled ="true" >< bean:message  key ="page.next" /></ html:submit >
77              < html:submit  property ="last"  styleClass ="t_input"  styleId ="last"  disabled ="true" >< bean:message  key ="page.last" /></ html:submit >
78            </ logic:equal >
79            < logic:notEqual  name ="admins"  property ="lastPage"  value ="true" >
80              < html:submit  property ="next"  styleClass ="t_input"  styleId ="next" >< bean:message  key ="page.next" /></ html:submit >
81              < html:submit  property ="last"  styleClass ="t_input"  styleId ="last" >< bean:message  key ="page.last" /></ html:submit >
82            </ logic:notEqual >
83            </ td >
84          </ html:form >
85          </ tr >
86        </ table >
87      </ logic:present >

       实际的页面效果图：



      OK，我的整个实现就完成了。我觉得有许多地方还是需要完善的，例如我的实现不够抽象，而且觉得繁琐了点，不过我一直都用着，还没有碰到过什么问题。请各位看完以后多多指教。