我的CSS停止工作

Question

我的css文件有问题，我暂时无法解决。我在java web技术方面比较新，我不知道会导致什么。我试图编写一个基于MVC的应用程序，其中我的servlet作为控制器工作，jsp作为视图，而我的数据库是我的模型。我的HomeController现在应该从数据库中检索类别的名称并将其转发给视图（home.jsp）。它工作正常，我可以在我的视图中显示类别，但自实施HomeController后，我的css文件已停止工作。所以我结束了工作控制器和awfull视图。我不知道问题出在哪里。

这里有显著文件：

的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" id="WebApp_ID" version="3.0"> 

    <context-param> 
    <param-name>databaseURL</param-name> 
    <param-value>jdbc:postgresql://localhost:5432/buyandsell</param-value> 
    </context-param> 
    <context-param> 
    <param-name>username</param-name> 
    <param-value>admin</param-value> 
    </context-param> 
    <context-param> 
    <param-name>password</param-name> 
    <param-value>admin</param-value> 
    </context-param> 

    <servlet> 
    <servlet-name>HomeController</servlet-name> 
    <servlet-class>controllers.HomeController</servlet-class> 
    </servlet> 

    <servlet-mapping> 
    <servlet-name>HomeController</servlet-name> 
    <url-pattern>/</url-pattern> 
    </servlet-mapping> 

</web-app> 

的HomeController：

public class HomeController extends HttpServlet { 

    private static final long serialVersionUID = 1L; 

    private String databaseURL; 
    private String username; 
    private String password; 

    /** 
    * @see HttpServlet#HttpServlet() 
    */ 
    public HomeController() { 
     super(); 
    } 

    @Override 
    public void init(ServletConfig config) throws ServletException { 
     // Retrieve the database-URL, username, password from webapp init parameters 
     super.init(config); 
     ServletContext context = config.getServletContext(); 
     databaseURL = context.getInitParameter("databaseURL"); 
     username = context.getInitParameter("username"); 
     password = context.getInitParameter("password"); 
    } 

    /** 
    * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 
    */ 
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
     Connection conn = null; 
     Statement stmt = null; 
     RequestDispatcher rd = null; 
     ArrayList<Category> categories = null; 
     try { 
      // Indicating proper database driver 
      Class.forName("org.postgresql.Driver"); 
      // Creating a database connection object 
      conn = DriverManager.getConnection(databaseURL, username, password); 
      // Creating a statement object inside our connection object 
      stmt = conn.createStatement(); 
      // Fetching a categories names 
      categories = fetchCategories(stmt); 
      // Setting categories for the view to display 
      request.setAttribute("categories", categories); 
      rd = request.getRequestDispatcher("/home.jsp"); 
      rd.forward(request, response); 
     } catch(ClassNotFoundException e) { 
      e.printStackTrace(); 
     } catch (SQLException e) { 
      e.printStackTrace(); 
     } finally { 
      try { 
       if(stmt != null) stmt.close(); 
       if(conn != null) conn.close(); 
      } catch(SQLException e) { 
       e.printStackTrace(); 
      } 
     } 
    } 

    /** 
    * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 
    */ 
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
     doGet(request, response); 
    } 

    /** 
    * Method responsible for fetching categories names from database. 
    * @param Reference to statement object. 
    * @return Returns object which contains names of available categories in array list or null if SQLException was thrown. 
    */ 

    private ArrayList<Category> fetchCategories(Statement stmt) { 
     ArrayList<Category> categories = new ArrayList<Category>(); 
     String query = "SELECT * FROM categories"; 
     try { 
      // Retrieving data from defined query 
      ResultSet rset = stmt.executeQuery(query); 
      // Creating category objects which will be forwarded to the view 
      while(rset.next()) { 
       int id = rset.getInt(1); 
       String name = rset.getString(2); 
       int parentId = rset.getInt(3); 
       categories.add(new Category(id, name, parentId)); 
      } 
      return categories; 
     } catch(SQLException e) { 
      e.printStackTrace(); 
     } 
     return null; 
    } 

} 

和片段针对home.jsp的：

    <%@ page import="java.util.ArrayList" %> 
        <%@ page import="models.Category" %> 
        <ul> 
         <% 
          ArrayList<Category> categories = (ArrayList<Category>) request.getAttribute("categories"); 
          if(categories != null && !categories.isEmpty()) { 
           for(int i=0; i<categories.size(); i++) { 
         %> 
            <li><a href="category?id=<%= categories.get(i).getId() %>"><span><%= categories.get(i).getName() %></span></a> 
         <% 
           } 
          } 
         %> 
        </ul> 
       </div> 

和：

<%@ 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=UTF-8"> 
    <link rel="stylesheet" href="stylesheet.css" type="text/css" />   
    <title>Buy&amp;Sell - online auctions.</title> 
</head> 

stylesheet.css被放置在WebContent文件夹中。

在此先感谢。

编辑：自从一开始，CSS文件就在同一个文件夹中。

Answer 1

您已将您的servlet映射到/。这是一个映射，这意味着：每个请求都发送到servlet。因此，当浏览器向/stylesheet.css发送请求时，请求将发送到servlet，而不是由提供静态文件的默认容器提供的servlet处理。

将您的servlet映射到另一个URL。