【发布时间】：2016-06-25 17:48:18
【问题描述】：
我正在运行 tomcat 7。我在本地计算机上构建了 mysql db 当我尝试运行 jsp 文件时，我得到 HTTP 状态 404 或 HTTP 状态 500。 我在这里阅读了所有问答，但没有找到答案。 对不起，我是servlet的新手......
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>todolistservlet</display-name>
<welcome-file-list>
<welcome-file> ToDoListLogin.jsp</welcome-file>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>login</servlet-name>
<servlet-class>Controller</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/ToDoListLogin.jsp</url-pattern>
</servlet-mapping>
</web-app>
ToDoListLogin.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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">
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>To Do List Login Page</title>
<!-- Bootstrap core CSS -->
<link href="../css/bootstrap.css" rel="stylesheet">
<!-- Custom styles for this template -->
<link href="../css/custom.css" rel="stylesheet">
</head>
<body background="./ToDoListWebPic/icon1.png" style="background-size:62%;">
<%
String authentication = (String)request.getSession().getAttribute("authentication");
%>
<div class="sign-container">
<div class="container">
<%
if (authentication != null && authentication == "false")
{
%>
<div class="alert alert-danger" style="margin-top:0;">
<strong>user id and/or Password Incorrect!</strong>
</div>
<%
}
%>
<form action="loginServlet" method="get" class="form-signin">
<h1 class="form-signin-heading text-primary">Wellcom to MyToDoList </h1>
<h2 class="form-signin-heading text-primary">Please sign in</h2>
<label for="inputUserId" class="sr-only">user Id</label>
<input type="text" id="inputuserId" name="userId" class="form-control" />
</div>
<div>
<label for="inputPassword" class="sr-only">Password</label>
<input type="password" id="inputPassword" name="password" class="form-control" />
<div>
<button class="btn btn-primary btn-lg" type="submit" onsubmit="EncryptorPass.encryptPassword(password)" >Sign in</button>
</div>
<div>
<a href="signup" class="btn btn-default btn-lg">Sign Up</a>
</div>
</form>
</div> <!-- /container -->
</div>
</body>
</html>`
loginServlet.java
package Controller;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import model.IToDoListDAO;
import model.ToDoListException;
/**
* Servlet implementation class loginServlet
*/
@WebServlet("/loginServlet")
public class loginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private IToDoListDAO dao = IToDoListDAO.getInstance();
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String encryptedPass = null;
request.getSession().getAttribute("currentList");
(String)request.getSession().getAttribute("currentItem");
EncryptorPass.encryptPassword(request.getParameter("password"));
boolean isUserExists;
int user = Integer.parseInt(userId);
try {
RequestDispatcher rd = null;
isUserExists = dao.UserAuthentication( user, pwd);
if (isUserExists)
{
// set authentication credentials into session
request.getSession().setAttribute("fullName", dao.getAllUsers());
request.getSession().setAttribute("userId", request.getParameter("userId"));
response.sendRedirect("home");
}
else
{
request.getSession().setAttribute("authentication", "false");
response.sendRedirect("ToDoListLogin");
rd = request.getRequestDispatcher("/errorpage.jsp");
}
rd.forward(request, response);
} catch (ToDoListException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
【问题讨论】：