请教JAVAWEB大神

好长。排版一下撒。
你这是想要 jstl 嵌套遍历吗？怎么没有看到 jstl 遍历标签代码？

VO类：
package Tmall.com.VO;import java.util.ArrayList;
import java.util.List;public class HeaderVO
{
private int id;
private int pId;
private String myTmallName;
private HeaderVO parent;
private List<HeaderVO> child = new ArrayList<HeaderVO>();

public List<HeaderVO> getChild() {
return child;
}
public void setChild(List<HeaderVO> child) {
this.child = child;
}
public HeaderVO getParent() {
return parent;
}
public void setParent(HeaderVO parent) {
this.parent = parent;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getpId() {
return pId;
}
public void setpId(int pId) {
this.pId = pId;
}
public String getMyTmallName() {
return myTmallName;
}
public void setMyTmallName(String myTmallName) {
this.myTmallName = myTmallName;
}
}public List<HeaderVO> getHeaderNav()
{
List<HeaderVO> headerNavList = new ArrayList<HeaderVO>();
DBConnection DBC = new DBConnection();
HeaderVO myHeaderNav = null;
String sql = "select * from Test";
ResultSet rs;
try {
rs = DBC.executeQuery(sql);
while(rs.next())
{
int id = rs.getInt("id");
int pId = rs.getInt("pId");
String myHeaderNavName = rs.getString("navName");

myHeaderNav = new HeaderVO();
myHeaderNav.setId(id);
myHeaderNav.setpId(pId);
myHeaderNav.setMyTmallName(myHeaderNavName);

HeaderVO grandParent = new HeaderVO();
grandParent.setId(pId);
myHeaderNav.setParent(grandParent);

HeaderVO parent = new HeaderVO();
parent.setId(pId);
myHeaderNav.setParent(parent);

HeaderVO nephew = new HeaderVO();
nephew.setId(pId);
myHeaderNav.setParent(nephew);

headerNavList.add(myHeaderNav);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
DBC.close();
}
return wrapHeaderNavList(headerNavList);
        }
private List<HeaderVO> wrapHeaderNavList(List<HeaderVO> headerNavList)
{
List<HeaderVO> grandParent = new ArrayList<HeaderVO>();
if(headerNavList != null && headerNavList.size() > 0)
{
for(HeaderVO headerNavListGrandParent : headerNavList)
{
if(headerNavListGrandParent.getParent().getId() == 0)
{
grandParent.add(headerNavListGrandParent);
for(HeaderVO headerNavListParent : headerNavList)
{
if(headerNavListParent.getParent().getId() == headerNavListGrandParent.getId())
{
headerNavListParent.setParent(headerNavListGrandParent);
headerNavListGrandParent.getChild().add(headerNavListParent);
for(HeaderVO headerNavListChild : headerNavList)
{
if(headerNavListChild.getParent().getId() == headerNavListParent.getId())
{
headerNavListChild.setParent(headerNavListParent);
headerNavListParent.getChild().add(headerNavListChild);
for(HeaderVO headerNavListNephew : headerNavList)
{
if(headerNavListNephew.getParent().getId() == headerNavListChild.getId())
{
headerNavListChild.getChild().add(headerNavListNephew);
headerNavListNephew.setParent(headerNavListChild);
}
}
}
}
}
}
}
}
}
return grandParent;
      }JSTL：
<c:forEach items="${myHeaderNav}" var="myHeaderNavs">
                            <i><img src="IMG/nav.png"></i>
                            <a href="#">${myHeaderNavs.myTmallName}</a>
                            <b></b>
                         <div class="headerNavDiv">
                                <c:forEach items="${myHeaderNavs.parent}" var="myHeaderNavParents">
                                    <div class="headerNavDivListLeft">
                                        <p>${myHeaderNavParents.myTmallName}</p>
                                        <c:forEach items="${myHeaderNavParents.child}" var="myHeaderNavParentChilds">
                                            <ol class="headerleft">
                                            <c:forEach items="${myHeaderNavParentChilds.nephew}" var="myHeaderNavnephews">
                                                <li><a href="#">${myHeaderNavnephews.myTmallName}</a></li>
                                            </c:forEach>
                                            </ol>
                                        </c:forEach>
                                    <div class="block"></div>
                                    </div>
                                </c:forEach>
</c:forEach>

你有把对象setAttribute（）吗？我怎么没看到。你这是放哪个作用域了？

你能把你使用的框架配置文件信息给看吗？ "${myHeaderNavs.parent}" 你这个得到是一个对象？还是一个属性？JSL是什么东西？你说的是JSTL吧

import java.util.*;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.*;
import Tmall.com.DAO.HeaderDAO;
import Tmall.com.VO.HeaderVO;public class IndexServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub

this.doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub

HeaderDAO headerDAO = new HeaderDAO();
List<HeaderVO> myTmall = headerDAO.getMyTmall();
req.setAttribute("myTmall", myTmall);
List<HeaderVO> myCollection = headerDAO.getCollection();
req.setAttribute("myCollection", myCollection);
List<HeaderVO> myHeaderNav = headerDAO.getHeaderNav();
req.setAttribute("myHeaderNav", myHeaderNav);
req.getRequestDispatcher("/index.jsp").forward(req,resp);
}
}

调试易

请教JAVAWEB大神

解决方案 »