struts分页的一种实现！(二)

最新推荐文章于 2025-05-13 11:50:38 发布

最新推荐文章于 2025-05-13 11:50:38 发布 · 65 阅读

文章标签：

#Struts #Bean #JSP

博客给出了Struts框架下查询与翻页功能的代码示例。包含查询Action、翻页Action的代码，展示了数据库访问bean中数据查询逻辑，还给出了JSP里翻页部分代码，实现了翻页功能向客户端的展示。

查询Action的代码片断

public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
Base queryForm= (Base) form;

if(!queryForm.getName().equals("")){
PageController pc=new PageController();
EmployeeBase service=new EmployeeBase();
ArrayList result=(ArrayList)service.search(queryForm,pc);

HttpSession session=request.getSession();

session.setAttribute("queryForm",queryForm);
session.setAttribute("pageController",service.getPageController());

request.setAttribute("queryResult",result);
request.setAttribute("pageController",service.getPageController());
return mapping.findForward("haveResult");
}else{
return mapping.findForward("noResult");
}

}

（3），翻页Action的代码片断

public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {

file://读取翻页参数

TurnPageForm turnPageForm=(TurnPageForm)form;

file://从PageController中取出查询信息，并使用bean提供的调用接口处理结果

HttpSession session=request.getSession();
PageController pc=(PageController)session.getAttribute("pageController");
Base queryForm=(Base)session.getAttribute("queryForm");

pc.setCurrentPage(turnPageForm.getViewPage());

EmployeeBase service=new EmployeeBase();

ArrayList result=(ArrayList)service.search(queryForm,pc);

file://根据参数将数据写入 request

request.removeAttribute("queryResult");
request.removeAttribute("pageController");
request.setAttribute("queryResult",result);
request.setAttribute("pageController",pc);

file://forward 到显示页面

return mapping.findForward("haveResult");

}

（4）数据库访问bean中的片断

public Collection search(Base base, PageController pc)
throws SQLException {
ArrayList emps = new ArrayList();
ResultSet rs = getSearchResult(base);

rs.absolute(-1);
pc.setTotalRowsAmount(rs.getRow());
setPageController(pc);
if (rs.getRow() > 0) {

rs.absolute(pc.getPageStartRow());

do {
System.out.println("in loop" + rs.getRow());

Base b = new Base();
b.setName(rs.getString("Name"));
b.setIdCard(rs.getString("IDCard"));
System.out.println("From db:" + rs.getString("IDCard"));
emps.add(b);
if (!rs.next()) {
break;
}
} while (rs.getRow() < (pc.getPageEndRow() + 1));
}
return emps;
}

(5)在jsp中，翻页部分的代码片断

<bean:write name="pageController" property="description"/>

<logic:equal name="pageController" property="hasPrevious" value="true">
<a href="turnPage.do?viewPage=<bean:write name="pageController" property="previousPage"/>" class="a02">
Previous
</a>
</logic:equal>

<logic:equal name="pageController" property="hasNext" value="true">
<a href="turnPage.do?viewPage=<bean:write name="pageController" property="nextPage"/>" class="a02">
Next
</a>
</logic:equal>

这样一来，翻页的功能可以以你喜欢的方式表现给client