It calls Servlet by click a href.
<li ><a href="<%=request.getContextPath() %>/ProviderServlet">privilegeManagement</a></li>
this code is include in the navigation.jsp which is included in the main.jsp.
then it's my servlet.
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
ProviderDao pd = new ProviderDao();
List<ProviderArchives> list = pd.getArchives();
String str = "chenfeng";
req.setAttribute("list", list);
req.setAttribute("hu" , str);
getServletContext().getRequestDispatcher("/jsp/main.jsp").forward(req,resp);
}
then it's my main.jsp.
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@page import="java.util.*"%>
<%@page import="com.chenfeng.javabean.ProviderArchives"%>
<%@ taglib prefix="c" uri="http://ift.tt/QfKAz6" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://ift.tt/kTyqzh">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>main</title>
</head>
<body>
<%@ include file="navigation.jsp"%>
<div>
<%@ include file="management.jsp"%>
</div>
<div>
<%
String k = (String)request.getAttribute("hu");
out.println(k);
%>
<c:forEach items="${list}" var="item">
<tr>
<td>${item.provideID() }</td>
<td>${item.GID }</td>
<td>${item.Gname }</td>
<td>${item.PID }</td>
<td>${item.TEL }</td>
<td>${item.ADDR }</td>
<td>
<a href="QueryUserByIdServlet?id=${item.provideID }">Modify</a>
<a href="DeleteUserServlet?id=${item.provideID }">Delete</a>
</td>
</tr>
</c:forEach>
</div>
</body>
</html>
then when I run this on server,it shows like this 
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