messagelist.do -> messagelist.jsp
用 messagelist.do?start=0 来显示第一个页面
参数说明:
list:信息列表
start:开始位置
page:每页显示的信息数目
previous:上页开始位置
next:下页开始位置
MessageListAction 里的 perform 是这样写的:
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int start = Integer.parseInt(request.getParameter("start"));
System.out.println ("Start:" + start);
int page = 4;
// create a message list
Message[] list = new Message[16];
for (int i=0; i<list.length; i++){
list[i] = new Message(i ,"message" + i);
}
request.setAttribute("list", list);
request.setAttribute("start", new Integer(start));
request.setAttribute("page", new Integer(page));
// if there is a previous page, set the previous variable
int previous = start-page;
if ( previous>=0 ){
request.setAttribute("previous", new Integer(previous));
System.out.println ("previous:" + previous);
}
// if there is a next page, set the next variable
int next = start+page;
if ( next<list.length ){
request.setAttribute("next", new Integer(next));
System.out.println ("next:" + next);
}
return (mapping.findForward("sUCcess"));
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下面是 messagelist.jsp 里的内容:
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<logic:iterate id="message" name="list" offset="start" length="page">
<br><Html:link
paramId="id" paramName="message" paramProperty="id"
page="/messagedetail.do">
<bean:write name="message" property="name" />
</html:link>
</logic:iterate>
<logic:present name="previous">
<br><html:link
paramId="start" paramName="previous"
page="/messagelist.do">
上一页
</html:link>
</logic:present>
<logic:present name="next">
<br><html:link
paramId="start" paramName="next"
page="/messagelist.do">
下一页
</html:link>
</logic:present>
------------------------------------------------------------------------------------
以此例子来说明 logic:iterate 在分页里的用法
由于每次 messagelist.do 都会处理所有的 message,所以性能上还是可以再优化
比如把 message 数组存放在 session 里。
:)
原文地址
http://www.chinaXP.org/forum/viewThread.go?parentId=1051714599611&forum=3