有人可以帮助我吗？我似乎无法找出为什么索引页不会与servlet交谈。我只是想尝试使用doGet（）方法，它甚至不会打印出我实施的system.out。
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="java.util.ArrayList" %>
<%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Add a Customer/Pet</title>
</head>
<body>
<h1>List of Customers</h1>
<form method="get" action="fetchDataServlet">
<c:forEach items="${sessionScope.customers}" var="customer">
<ul>
<li>${customer.getFirstName()}</li>
</ul>
</c:forEach>
</form>
</body>
</html>
package edu.witc.Assignment05.controller;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//import javax.servlet.annotation.WebServlet;
//import javax.servlet.http.HttpServlet;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import edu.witc.Assignment05.model.Customer;
import edu.witc.Assignment05.model.CustomerDAO;
@WebServlet(description = "servlet to get act as controller between form and models", urlPatterns = { "/fetchDataServlet","/addCustomer","/addPet", "/customerManagement" })
public class FetchDataServlet<T> extends HttpServlet {
private static final long serialVersionUID = 1L;
public FetchDataServlet() {
super();
}
@Override
public void init() throws ServletException {
System.out.print("INIT");
}
private List<edu.witc.Assignment05.model.Customer> customers = new ArrayList<Customer>();
private void addCustomer(HttpServletResponse response, HttpServletRequest request)//redirect to form
throws IOException, ServletException {
String url = "/customerManagement.jsp";
//processRequest(request, response);
Customer customer = new Customer();
HttpSession session = request.getSession();
session.setAttribute("customer", customer);
request.getRequestDispatcher(url).forward(request,response);
}
private void addPet(HttpServletResponse response, HttpServletRequest request)//redirect to pet page
throws IOException, ServletException {
String url = "/pets.jsp";
request.getRequestDispatcher(url).forward(request,response);
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession();
System.out.println("MADE IT");
CustomerDAO<T> dao;
try {
dao = new CustomerDAO<T>();
customers = dao.getData();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
request.setAttribute("customers", customers);
System.out.println(customers.size());
String url = "/index.jsp";
request.getRequestDispatcher(url).forward(request,response);
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
System.out.println("IN THE POST");
int customerId = 0;
Customer customer = new Customer();
if (customer != null) {
customerId = customers.size()+1;
customer.setCustomerId(customerId);
customer.setFirstName(request.getParameter("firstName"));
customer.setLastName(request.getParameter("lastName"));
customer.setEmailAddress(request.getParameter("email"));
customer.setPhoneNumber(request.getParameter("phone"));
customers.add(customer);
}
}
}
Apr 30, 2014 5:23:13 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre7\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\windows\system32;C:\windows;C:\windows\System32\Wbem;C:\windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x64;C:\Program Files\Lenovo\Bluetooth Software\;C:\Program Files\Lenovo\Bluetooth Software\syswow64;c:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;c:\Program Files\Microsoft SQL Server\100\Tools\Binn\;c:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files\Microsoft SQL Server\110\DTS\Binn\;C:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn\ManagementStudio\;C:\Program Files (x86)\Microsoft SQL Server\110\DTS\Binn\;C:\Program Files (x86)\nodejs\;C:\Program Files (x86)\QuickTime\QTSystem\;C:\Program Files\Microsoft\Web Platform Installer\;C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\;C:\Program Files (x86)\Windows Kits\8.0\Windows Performance Toolkit\;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\RailsInstaller\Git\cmd;C:\RailsInstaller\Ruby1.9.3\bin;C:\Users\esder_000\AppData\Roaming\npm;.
Apr 30, 2014 5:23:13 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Justin_EJ_Assignment05_15400579' did not find a matching property.
Apr 30, 2014 5:23:13 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Justin_EJ_Assignment02_15400579' did not find a matching property.
Apr 30, 2014 5:23:13 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Apr 30, 2014 5:23:13 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Apr 30, 2014 5:23:13 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 643 ms
Apr 30, 2014 5:23:13 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Apr 30, 2014 5:23:13 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.52
Apr 30, 2014 5:23:14 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Apr 30, 2014 5:23:14 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Apr 30, 2014 5:23:14 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1145 ms