Posted on 2008-11-27 13:34
wesley1987 阅读(764)
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struts学习项目
1.。JSP页面中：
////////////数据显示///////////////////////
显示 从数据库查出的，放在 list<offer> 中的数据。
<c:forEach items="${requestScope.list}" var="offer">
<tr>
<td height="25">${offer.offername}</td>
<td height="25">${offer.offeradd}</td>
<td height="25">${offer.tel}</td>
<td height="25">${offer.connecter}</td>
<td height="25">${offer.bank}</td>
<td height="25">${offer.account}</td>
<td height="25">${offer.post}</td>
<td height="25" onclick="showComment(${offer.offerId})"><p id="getshow${offer.offerId}"> 查看备注 </p><p id=${offer.offerId} style="display:none">${offer.comment}</p></td>
<td height="25"><a href="">修改</a></td>
<td height="25"><a onclick="deleteCheck('${offer.offername}')">删除</a></td>
</tr></c:forEach>
<script>
function showComment(sid){
if(document.getElementById(sid).style.display=="none"){
document.getElementById(sid).style.display="inline";
document.getElementById("getshow"+sid).style.display="none";}
else {
document.getElementById(sid).style.display="none";
document.getElementById("getshow"+sid).style.display="inline";}
}
function deleteCheck(offername){
var name=offername;
if(confirm("确认删除供应商 ："+name+" ？"))
window.location="<%=path%>/service/message.jsp?message=needtochange";
return;
}</script>
////////
///////////分页选择单 //////////////////////
参数说明 每次显示 5个页面连接，按 '<' '>' 则显示上/下5个页面：
pagePart 以5页面为以part。从1开始
currPage 当前页数
pageCount 总页数
1<div class=digg align="right">
2 <c:choose>
3 <c:when test="${requestScope.pagePart>1}">
4 <a href="<%=path%>/offerSearch.do?offername=${requestScope.offername}&page=${requestScope.pagePart*5-5}">< </a>
5 </c:when>
6 <c:otherwise>
7 <span class=disabled><</span>
8 </c:otherwise>
9 </c:choose>
10
11 <c:forEach begin="${(requestScope.pagePart*5-4)>0?requestScope.pagePart*5-4:1}" end="${requestScope.pagePart*5<requestScope.pageCount?requestScope.pagePart*5:requestScope.pageCount}" var="page">
12 <c:choose>
13 <c:when test="${requestScope.currPage==page}"><span class=current>${page}</span></c:when>
14 <c:otherwise><a href="<%=path%>/offerSearch.do?offername=${requestScope.offername}&page=${page}">${page}</a></c:otherwise>
15 </c:choose>
16 </c:forEach>
17
18 <c:choose>
19 <c:when test="${requestScope.pagePart*5<requestScope.pageCount}">
20 <a href="<%=path%>/offerSearch.do?offername=${requestScope.offername}&page=${requestScope.pagePart*5+1}"">> </a>
21 </c:when>
22 <c:otherwise><span class=disabled>></span></c:otherwise>
23 </c:choose><span class=disabled>${requestScope.currPage}/${requestScope.pageCount}</span>
24</div>
25
26
分页处用到的CSS
DIV.digg {
}{
PADDING-RIGHT: 3px; PADDING-LEFT: 3px; PADDING-BOTTOM: 3px; MARGIN: 3px; PADDING-TOP: 3px; TEXT-ALIGN: center
}
DIV.digg A {}{
BORDER-RIGHT: #aaaadd 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #aaaadd 1px solid; PADDING-LEFT: 5px; PADDING-BOTTOM: 2px; MARGIN: 2px; BORDER-LEFT: #aaaadd 1px solid; COLOR: #000099; PADDING-TOP: 2px; BORDER-BOTTOM: #aaaadd 1px solid; TEXT-DECORATION: none
}
DIV.digg A:hover {}{
BORDER-RIGHT: #000099 1px solid; BORDER-TOP: #000099 1px solid; BORDER-LEFT: #000099 1px solid; COLOR: #000; BORDER-BOTTOM: #000099 1px solid
}
DIV.digg A:active {}{
BORDER-RIGHT: #000099 1px solid; BORDER-TOP: #000099 1px solid; BORDER-LEFT: #000099 1px solid; COLOR: #000; BORDER-BOTTOM: #000099 1px solid
}
DIV.digg SPAN.current {}{
BORDER-RIGHT: #000099 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #000099 1px solid; PADDING-LEFT: 5px; FONT-WEIGHT: bold; PADDING-BOTTOM: 2px; MARGIN: 2px; BORDER-LEFT: #000099 1px solid; COLOR: #fff; PADDING-TOP: 2px; BORDER-BOTTOM: #000099 1px solid; BACKGROUND-COLOR: #000099
}
DIV.digg SPAN.disabled {}{
BORDER-RIGHT: #eee 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #eee 1px solid; PADDING-LEFT: 5px; PADDING-BOTTOM: 2px; MARGIN: 2px; BORDER-LEFT: #eee 1px solid; COLOR: #ddd; PADDING-TOP: 2px; BORDER-BOTTOM: #eee 1px solid
}
2 处理的Action
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws Exception {}{
String offername = Model.changeStr(request.getParameter("offername"));
request.setAttribute("offername", offername);
request.setAttribute("pageCount", OfferSearchModel.getPageCount(offername));
if(request.getParameter("page")==null){
request.setAttribute("list", OfferSearchModel.getOfferList(offername, 1));
request.setAttribute("pagePart", 1);
request.setAttribute("currPage", 1);
}
else{}{
int page = Integer.parseInt(request.getParameter("page"));
int pagePart = (page-1)/5+1;
request.setAttribute("list", OfferSearchModel.getOfferList(offername, page));
request.setAttribute("pagePart", pagePart);
request.setAttribute("currPage", page);
}
return mapping.findForward("show");
}
3 数据库查询 （pageSize 每页显示条数）
String sql="select count(*) from offer where offername like '%"+offername+"%'";
sql = sql+"where offername like '%"+offername+"%' and rownum <="+pageSize
+"and offerid not in (select offerid from offer where offername like '%"+offername
+"%' and rownum <="+pageSize*(page-1)+")";
后记：第三步的SQL语句 本来是根据top-N的方法得来的，但是在Oracle中使用后发现个错误：
比如取第5页数据：
select * from offer where offername like 'offername' and rownum <=10
and offerid not in (select offerid from offer where offername like 'offername' and rownum <=10*(5-1));
错误原因是 （）中的子查询 和外面的查询的排序方式不同！！非常诡异的问题，折腾一下午也没解决。
现在实际用的是全取出后，再截取需要数据。虽然这个方法不好，但是可以方便做成公共的接口和实现。
这个方法的Oracle替换方法 可以考虑用过程函数的游标实现。还有用集合运算中的MINUS相减，算法应该和上面的是一样的。