【下载文档:  jsp基础教程：中c_foreach遍历和s_iterator遍历异同实例分析.txt 】

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JSP中c:foreach遍历和s:iterator遍历异同实例分析
本文实例分析了JSP中c:foreach遍历和s:iterator遍历的异同。分享给大家供大家参考。具体如下：
①jstl c:foreach
首先我们来看一个普通的servlet:
import com.xy.entity.Board;
import com.xy.entity.Topic;
import com.xy.entity.User;
public class ToMainAction extends HttpServlet
{
private IBoarderDao boardDao = new BoardDaoImpl();
private ITopicDao topicDao = new TopicDaoImpl();
private IUserDao userDao = new UserDaoImpl();
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException,IOException
{
// 板块列表
List boards = boardDao.getAllBoard();
List count = new ArrayList();
List users = new ArrayList();
List lastTopic = new ArrayList();
if (null != boards)
{
for (Board b : boards)
{
// 回帖数
List topic = topicDao.getTopicByBoardId(b.getborderId());
if(null!=topic)
{
int num = topic.size();
count.add(num);
}
else
{
count.add(0);
}
// 最近更新
Topic t = topicDao.getLastTopic(b.getborderId());
lastTopic.add(t);
// 最近更新的作者
User u = userDao.getUserByuId(t.getUid());
users.add(u);
}
request.setAttribute("boards", boards);
request.setAttribute("count", count);
request.setAttribute("users", users);
request.setAttribute("lastTopic", lastTopic);
RequestDispatcher dis = request.getRequestDispatcher("main.jsp");
dis.forward(request, response);
}
}
public void doPost
(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
this.doGet(request, response);
}
}
main.jsp:
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

${b.borderName}

${requestScope.count[status.index]}

${requestScope.lastTopic[status.index].title}

${requestScope.users[status.index].userName}

修改时间：


${requestScope.lastTopic[status.index].modifyTime}

②s:iterator
package com.xy.action;
action
public class ToMainAction extends ActionSupport implements RequestAware
{
private IBoarderDao boardDao = new BoardDaoImpl();
private ITopicDao topicDao = new TopicDaoImpl();
private IUserDao userDao = new UserDaoImpl();
private Map request;
public void setBoardDao(IBoarderDao boardDao)
{
this.boardDao = boardDao;
}
public void setTopicDao(ITopicDao topicDao)
{
this.topicDao = topicDao;
}
public void setUserDao(IUserDao userDao)
{
this.userDao = userDao;
}
public String execute()
{
// 板块列表
List boards = boardDao.getAllBoard();
List count = new ArrayList();
List users = new ArrayList();
List lastTopic = new ArrayList();
if (null != boards)
{
for (Board b : boards)
{
// 回帖数
List topic = topicDao.getTopicByBoardId(b.getBorderId());
if (null != topic)
{
int num = topic.size();
count.add(num);
} else
{
count.add(0);
}
// 最近更新
Topic t = topicDao.getLastTopic(b.getBorderId());
lastTopic.add(t);
// 最近更新的作者
User u = userDao.getUserByuId(t.getUid());
users.add(u);
}
request.put("boards", boards);
request.put("count", count);
request.put("users", users);
request.put("lastTopic", lastTopic);
}
return SUCCESS;
}
public void setRequest(Map request)
{
this.request = request;
}
}
main.jsp：
<%@ taglib uri="/struts-tags" prefix="s"%>

+">

修改时间：

希望本文所述对大家的JSP程序设计有所帮助。