l老师，出现个500的错误

l老师，出现个500的错误

Filter

package com.imooc.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@WebFilter("/AuthFilter")
public class AuthFilter implements Filter {

    
    public AuthFilter() {
        
    }

	public void destroy() {
		
	}

	
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest hrequest=(HttpServletRequest) request;
		HttpServletResponse hresponse=(HttpServletResponse) response;
		String loginUser=(String) hrequest.getSession().getAttribute("loginUser");
		if(loginUser==null) {
			hresponse.sendRedirect(hrequest.getContextPath()+"/login.jsp?flag=1");
			return;
		}else {
			chain.doFilter(request, response);
			return;
		}
		
	}

	
	public void init(FilterConfig fConfig) throws ServletException {
		
	}

}
package com.imooc.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;


@WebFilter("/EncodeFilter")
public class EncodeFilter implements Filter {

	private FilterConfig config;
    
    public EncodeFilter() {
       
    }

	
	public void destroy() {
		
	}

	
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		request.setCharacterEncoding(config.getInitParameter("charset"));
		chain.doFilter(request, response);
	}

	public void init(FilterConfig config) throws ServletException {
	       this.config=config;	
	}


	public FilterConfig getConfig() {
		return config;
	}


	public void setConfig(FilterConfig config) {
		this.config = config;
	}
    
}

mainclass

package com.imooc.mainclass;

public class Book {
	private String bookId;
	private String bookName;
	private String categoryBook;
	private Float price;
	private String path;
	private String description;

	public Book() {
		super();
	}

	public Book(String bookId, String bookName, String categoryBook, Float price, String path, String description) {
		super();
		this.bookId = bookId;
		this.bookName = bookName;
		this.categoryBook = categoryBook;
		this.price = price;
		this.path = path;
		this.description = description;
	}

	public String getBookId() {
		return bookId;
	}

	public void setBookId(String bookId) {
		this.bookId = bookId;
	}

	public String getBookName() {
		return bookName;
	}

	public void setBookName(String bookName) {
		this.bookName = bookName;
	}

	public String getCategoryBook() {
		return categoryBook;
	}

	public void setCategoryBook(String categoryBook) {
		this.categoryBook = categoryBook;
	}

	public Float getPrice() {
		return price;
	}

	public void setPrice(Float price) {
		this.price = price;
	}

	public String getPath() {
		return path;
	}

	public void setPath(String path) {
		this.path = path;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	@Override
	public String toString() {
		return "Book [bookId=" + bookId + ", bookName=" + bookName + ", categoryBook=" + categoryBook + ", price="
				+ price + ", path=" + path + ", description=" + description + "]";
	}

}
package com.imooc.mainclass;

public class Category {
	private String categoryId;
	private String categoryName;

	public Category() {
		super();
	}

	public Category(String categoryId, String categoryName) {
		super();
		this.categoryId = categoryId;
		this.categoryName = categoryName;
	}

	public String getCategoryId() {
		return categoryId;
	}

	public void setCategoryId(String categoryId) {
		this.categoryId = categoryId;
	}

	public String getCategoryName() {
		return categoryName;
	}

	public void setCategoryName(String categoryName) {
		this.categoryName = categoryName;
	}

	@Override
	public String toString() {
		return "Category [categoryId=" + categoryId + ", categoryName=" + categoryName + "]";
	}

}
package com.imooc.mainclass;

public class User {

	private String username;
	private String password;

	public User() {

	}

	public User(String username, String password) {
		super();
		this.username = username;
		this.password = password;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	@Override
	public String toString() {
		return "User [username=" + username + ", password=" + password + "]";
	}

}

service

package com.imooc.service;

import com.imooc.mainclass.Category;
import com.imooc.service.impl.CategoryServiceImpl;

public interface CategoryService {

	public void addCategory(String categoryId, String categoryName);

	public Category check(Category category);

	
	public void deleteCategory(String categoryId);
	
	
}
package com.imooc.service;

import java.util.List;

import com.imooc.mainclass.User;

public interface UserService {

	User login(List<User> userList, User user);

	

}

serviceImpl

package com.imooc.service.impl;

import java.util.ArrayList;
import java.util.List;

import com.imooc.mainclass.Category;
import com.imooc.service.CategoryService;

public class CategoryServiceImpl implements CategoryService {
	private static final List<Category> categoryDb = new ArrayList<Category>();

	public void addCategory(String categoryId, String categoryName) {
		categoryDb.add(new Category(categoryId, categoryName));
	}

	public void deleteCategory(String categoryId) {
		Category cgy = null;
		for (Category category : categoryDb) {
			if (category.getCategoryId().equals(categoryId)) {
				cgy = category;
			}
		}
		categoryDb.remove(cgy);
	}

	@Override
	public Category check(Category category) {
		for (Category existCategory : categoryDb) {
			if (existCategory.getCategoryId().equals(category.getCategoryId())
					|| existCategory.getCategoryName().equals(category.getCategoryName())) {
                   return existCategory;  
			}

		}
		return null;

	}

}
package com.imooc.service.impl;

import java.util.List;

import com.imooc.mainclass.User;
import com.imooc.service.UserService;

public class UserServiceImpl implements UserService {

	@Override
	public User login(List<User> userList, User user) {
	   for(User existUser:userList) {
		   if(existUser.getUsername().equals(user.getUsername())&&existUser.getPassword().equals(user.getPassword())) {
			 return existUser;  
		   }
	   }
		return null;
	}

}

utils

package com.imooc.utils;

import java.util.UUID;

public class UploadUtils {
	public static String getUuidFileName(String fileName) {
		int idx=fileName.lastIndexOf(".");
		String exName=fileName.substring(idx);
		String UUidFileName=UUID.randomUUID().toString().replace("-", "")+exName;
		return UUidFileName;
	}

}

Listener

package com.imooc.web.listener;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;

import com.imooc.mainclass.User;

@WebListener
public class InitServletContextListener implements ServletContextListener {

    public InitServletContextListener() {
        
    }

	
    public void contextDestroyed(ServletContextEvent sce)  { 
         
    }

	
    public void contextInitialized(ServletContextEvent sce)  { 
         //创建一个用于保存用户信息的List集合
    	List<User> userList=new ArrayList<User>();
    	userList.add(new User("admin","123456"));
    	userList.add(new User("user","654321"));
    	userList.add(new User("aaa","123123"));
    	userList.add(new User("bbb","456456"));
    	userList.add(new User("ccc","123456"));
    	sce.getServletContext().setAttribute("userList", userList);
    }
	
}

servlet

package com.imooc.web.servlet;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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 org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import com.imooc.mainclass.Book;
import com.imooc.utils.UploadUtils;

@WebServlet("/addBookServlet")
public class addBookServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
 
    public addBookServlet() {
        super();
       
    }

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	
		Map<String,String> map=new HashMap<String,String>();
		//创建磁盘文件项工厂
		DiskFileItemFactory diskFileItemFactory=new DiskFileItemFactory();
		//创建核心解析类
		ServletFileUpload fileUpload=new ServletFileUpload(diskFileItemFactory);
		//解析请求对象，将请求分成几个部分FileItem
		try {
			List<FileItem> list=fileUpload.parseRequest(request);
			//遍历集合，获得各个部分的对象
			for(FileItem fileItem:list) {
				if(fileItem.isFormField()) {
					String name=fileItem.getName();
					String value=fileItem.getString("UTF-8");
					map.put(name, value);
				}else {
					String fileName=fileItem.getName();
					String uuidFileName=UploadUtils.getUuidFileName(fileName);
					InputStream is=fileItem.getInputStream();
					String path=getServletContext().getRealPath("/upload");
					String url= path+"\\"+uuidFileName;
					map.put("path", request.getContextPath()+"/upload"+uuidFileName);
					OutputStream os=new FileOutputStream(url);
					int len=0;
					byte[] b=new byte[1024];
					while((len=is.read(b))!=-1) {
						os.write(b, 0, len);
					}
					is.close();
					os.close();
				}
			}
		} catch (FileUploadException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		Book book=new Book();
		book.setBookId(map.get("bookId"));
		book.setBookName(map.get("bookName"));
		book.setCategoryBook(map.get("categoryId"));
		book.setPrice(Float.parseFloat(map.get("bookPrice")));
		book.setDescription(map.get("remarks"));
		book.setPath(map.get("path"));
		response.sendRedirect(request.getContextPath()+"/bookList.jsp");
	
	}

}
package com.imooc.web.servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

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 com.imooc.mainclass.Category;
import com.imooc.service.CategoryService;
import com.imooc.service.impl.CategoryServiceImpl;


@WebServlet("/addCategoryServlet")
public class addCategoryServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
    
    public addCategoryServlet() {
        super();
        
    }

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//获取数据
		String categoryId=request.getParameter("categoryId");
		String categoryName=request.getParameter("categoryName");
		Category category=new Category(categoryId,categoryName);
		CategoryService categoryService=new CategoryServiceImpl();
		List<Category> categoryList=(List<Category>)request.getSession().getAttribute("categoryList");
		if(categoryList==null) {
			categoryList=new ArrayList();
		}
		//将输入的数据与后台比对
		Category existCategory=categoryService.check(category);
		if(existCategory==null) {
			//如果后台数据中为空，则添加数据，同时将分类加入到分类列表中
			categoryService.addCategory(categoryId, categoryName);
			categoryList.add(category);
			//将列表的集合存入session中
			request.getSession().setAttribute("categoryList", categoryList);
			response.sendRedirect(request.getContextPath()+"/categoryList.jsp");
		}else {
			response.sendRedirect(request.getContextPath()+"/addCategory.jsp?flag=1");
		}
		
				
	}

}
package com.imooc.web.servlet;

import java.io.IOException;
import java.util.List;

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 com.imooc.mainclass.Category;
import com.imooc.service.CategoryService;
import com.imooc.service.impl.CategoryServiceImpl;


@WebServlet("/deleteCategoryServlet")
public class deleteCategoryServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
    
    public deleteCategoryServlet() {
        super();
      
    }
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String categoryId=request.getParameter("categoryId");
		CategoryService categoryService=new CategoryServiceImpl();
		categoryService.deleteCategory(categoryId);
		List<Category> categoryList=(List<Category>) request.getSession().getAttribute("categoryList");
		Category cate=null;
		for(Category category:categoryList) {
			if(category.getCategoryId().equals(categoryId)) {
				cate=category;
			}
		}
		categoryList.remove(cate);
		request.getSession().setAttribute("categoryList", categoryList);
		response.sendRedirect(request.getContextPath()+"/categoryList.jsp");
		
	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		doGet(request, response);
	}

}
package com.imooc.web.servlet;

import java.io.IOException;
import java.util.List;

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 com.imooc.mainclass.User;
import com.imooc.service.UserService;
import com.imooc.service.impl.UserServiceImpl;


@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
   
    public LoginServlet() {
        super();
       
    }

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String code1=(String) request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);
		String code2=request.getParameter("checkCode");
		if(code2==null||!code2.equalsIgnoreCase(code1)) {
			request.setAttribute("msg", "验证码输入不正确！");
			request.getRequestDispatcher("/login.jsp").forward(request, response);
			return;
		}
		 
		//接收数据
		String username=request.getParameter("username");
		String password=request.getParameter("password");
		//封装数据
		User user=new User(username,password);
		//处理数据，完成登录
		UserService userService=new UserServiceImpl();
		//获取用户列表的集合
		List<User> userList=(List<User>)getServletContext().getAttribute("userList");
		User existUser=userService.login(userList,user);
		//显示结果
		if(existUser==null) {
			//登录失败
			request.setAttribute("msg", "用户名或者密码错误");
			request.getRequestDispatcher("/login.jsp").forward(request, response);
		}else {
			//登录成功
			request.getSession().setAttribute("existUser",existUser);
			request.getSession().setAttribute("loginUser", username);
			response.sendRedirect(request.getContextPath()+"/categoryList.jsp");
		}
	}

}

jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>        
<% 
String loginUser=(String)request.getSession().getAttribute("loginUser");
%>    
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>新建图书信息</title>
        <link rel="stylesheet" href="css/bootstrap.min.css">
        <link rel="stylesheet" href="css/add.css">
    </head>
    <body>
        <nav class="navbar navbar-default">
            <div class="container">
                <div class="navbar-header">
                    <a class="navbar-brand" href="/dept/list.do">
                        图书信息管理
                    </a>
                </div>
            </div>
        </nav>
        <div class="container">
            <div class="jumbotron">
                <h1>Hello, <%=loginUser%>!</h1>
                <p>请小心地新增图书信息，要是建了一个错误的就不好了。。。</p>
            </div>
            <div class="page-header">
                <h3><small>新建</small></h3>
            </div>
            <form class="form-horizontal" action="${pageContext.request.contextPath}/addBookServlet" method="post" enctype="multipart/form-data">

                <div class="form-group">
                    <label for="name" class="col-sm-2 control-label">图书编号 ：</label>
                    <div class="col-sm-8">
                        <input name="bookId" class="form-control" id="bookId">
                    </div>
                </div>
                <div class="form-group">
                    <label for="name" class="col-sm-2 control-label">图书名称 ：</label>
                    <div class="col-sm-8">
                        <input name="bookName" class="form-control" id="bookName">
                    </div>
                </div>
                <div class="form-group">
                    <label for="categoryId" class="col-sm-2 control-label">分类 ：</label>
                    <select id="categoryId" name="categoryId" class="col-sm-2 form-control" style="width: auto;margin-left: 15px">
                       <c:forEach items="${sessionScope.categoryList}" var="cList" varStatus="idx">
                       <option value="${cList.categoryId}" selected="">${cList.categoryName}</option>
                       </c:forEach>
                       <!-- 下拉列表的内容要从分类中进行读取，value值是分类id -->
                    </select>
                </div>

                 <div class="form-group">
                    <label for="name" class="col-sm-2 control-label">价格 ：</label>
                    <div class="col-sm-8">
                        <input name="bookPrice" class="form-control" id="bookPrice">
                    </div>
                  </div>
                   
                  <div class="form-group" >
                    <label for="name" class="col-sm-2 control-label">图书封面 ：</label>
                    <input type="file" id="bookPic" name="bookPic" style="padding-left: 15px">
                  </div>

                  <div class="form-group">
                    <label for="name" class="col-sm-2 control-label">备注 ：</label>
                    <div class="col-sm-8">
                        <input name="remarks" class="form-control" id="remarks">
                    </div>
                  </div>

                <div class="form-group">
                    <div class="col-sm-offset-2 col-sm-10">
                        <button type="submit" class="btn btn-primary">保存</button>&nbsp;&nbsp;&nbsp;
                    </div>
                </div>
            </form>
        </div>
        <footer class="text-center" >
            copy@imooc
        </footer>
    </body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<% 
String loginUser=(String)request.getSession().getAttribute("loginUser");
String flag=(String)request.getParameter("flag");
%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>新建图书分类</title>
        <link rel="stylesheet" href="css/bootstrap.min.css">
        <link rel="stylesheet" href="css/add.css">
        <script type="text/javascript">
        var flag='<%=flag%>';
        if(flag=="1"){
        	alert("您输入的分类已存在，请重新输入");
        }
        </script>
    </head>
    <body>
        <nav class="navbar navbar-default">
            <div class="container">
                <div class="navbar-header">
                    <a class="navbar-brand" href="">
                        图书分类管理
                    </a>
                </div>
            </div>
        </nav>
        <div class="container">
            <div class="jumbotron">
                <h1>Hello, <%=loginUser%>!</h1>
                <p>请小心地新增图书分类，要是建了一个错误的就不好了。。。</p>
                
            </div>
            <div class="page-header">
                <h3><small>新建</small></h3>
            </div>
            <form class="form-horizontal" action="${pageContext.request.contextPath}/addCategoryServlet" method="post">
                <div class="form-group">
                    <label for="name" class="col-sm-2 control-label">分类ID ：</label>
                    <div class="col-sm-8">
                        <input name="categoryId" class="form-control" id="categoryId">
                    </div>
                </div>
                <div class="form-group">
                    <label for="name" class="col-sm-2 control-label">分类名称 ：</label>
                    <div class="col-sm-8">
                        <input name="categoryName" class="form-control" id="categoryName">
                    </div>
                </div>

                <div class="form-group">
                    <div class="col-sm-offset-2 col-sm-10">
                        <button type="submit" class="btn btn-primary">保存</button>&nbsp;&nbsp;&nbsp;
                    </div>
                </div>
            </form>
        </div>
        <footer class="text-center" >
            copy@imooc
        </footer>
    </body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>图书后台管理</title>
        <link rel="stylesheet" href="css/index.css">
        <link rel="stylesheet" href="css/bootstrap.min.css">
      
    </head>

    <body>
       <header>
            <div class="container">
                    <nav>
                            <a href="${pageContext.request.contextPath}/bookList.jsp" >图书信息管理</a>
                    </nav>
                    <nav>
                            <a href="${pageContext.request.contextPath}/categoryList.jsp" >分类管理</a>
                    </nav>
                   
            </div>
        </header>
        <section class="banner">
            <div class="container">
                <div>
                    <h1>图书管理系统</h1>
                    <p>图书信息管理</p>
                </div>
            </div>
        </section>
        <section class="main">


            <div class="container">
                <form class="form-horizontal" action="/searchBook" method="post">
                <div class="form-group"  style="float: right;">
                    <div class="col-sm-offset-2 col-sm-10">
                        <button type="submit" class="btn btn-primary">查询</button>&nbsp;&nbsp;&nbsp;
                    </div>
                </div>
                <div class="form-group" style="float: right;width: 300px;">
                    <div class="col-sm-8">
                        <input name="searchContent" class="form-control" id="searchContent"
                        placeholder="输入要查询的分类" style="width: 250px">
                    </div>
                </div>

                
            </form>
            </div>
            <div class="container">

                <table class="table table-striped">
                    <thead>
                    <tr>
                        <th>序号</th>
                        <th>图书编号</th>
                        <th>图书名称</th>
                        <th>分类</th>
                        <th>价格</th>
                        <th>图书封面</th>
                        <th>操作</th>

                    </tr>
                    </thead>
                    <tbody>
                        <c:forEach items="" var="">
                            <tr id="tr1">
                                <td>1</td>
                                <td>book0001</td>
                                <td>Java基础</td>
                                <td>计算机类</td>
                                <td>￥29</td>
                                <td><img src="img/g1.jpg"></td>
                                <td>
                                <a href="/updateBook?bookId=book0001">修改</a>
                                <a href="/deleteBook?bookId=book0001">删除</a>

                                </td>
                                <!--在循环显示数据时，此处的book0001可以用EL表达式进行替换-->

                            </tr>
                        </c:forEach>
                    </tbody>
                </table>
            </div>
        </section>
        <section class="page">
            <div class="container">
                <div id="fatie">
                    <a href="${pageContext.request.contextPath}/addBook.jsp"><button>新建</button></a>
                </div>
            </div>
        </section>
        <footer>
            copy@慕课网
        </footer>
    </body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>    
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>图书后台管理</title>
        <link rel="stylesheet" href="css/index.css">
        <link rel="stylesheet" href="css/bootstrap.min.css">
    </head>

    <body>
       <header>
            <div class="container">
                    <nav>
                            <a href="${pageContext.request.contextPath}/bookList.jsp" >图书信息管理</a>
                    </nav>
                    <nav>
                            <a href="${pageContext.request.contextPath}/categoryList.jsp" >分类管理</a>
                    </nav>
                   
            </div>
        </header>
        <section class="banner">
            <div class="container">
                <div>
                    <h1>图书管理系统</h1>
                    <p>图书分类管理</p>
                </div>
            </div>
        </section>
        <section class="main">
            <div class="container">
                <table class="table table-striped">
                    <thead>
                    <tr>
                        <th>序号</th>
                        <th>分类编号</th>
                        <th>分类名称</th>
                        <th>操作</th>
                    </tr>
                    </thead>
                    <tbody>
                        <c:forEach items="${sessionScope.categoryList}" var="cList" varStatus="idx">
                        <c:if test="${sessionScope.categoryList!=null}">
                            <tr>
                                <td>${idx.index+1}</td>
                                <td>${cList.categoryId}</td>
                                <td>${cList.categoryName}</td>
                                <td><a href="${pageContext.request.contextPath}/deleteCategoryServlet?categoryId=${cList.categoryId}">删除</a></td>
                                <!--在循环显示数据时，此处的ca0001可以用EL表达式进行替换-->

                            </tr>
                           </c:if>
                        </c:forEach>
                    </tbody>
                </table>
            </div>
        </section>
        <section class="page">
            <div class="container">
                <div id="fatie">
                    <a href="${pageContext.request.contextPath}/addCategory.jsp"><button>新建</button></a>
                </div>
            </div>
        </section>
        <footer>
            copy@慕课网
        </footer>
    </body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
String flag=request.getParameter("flag");
%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>登录</title>
        <link rel="stylesheet" href="css/login.css">
         <script type="text/javascript">
          function changeImg(){
        	  var codeImg=document.getElementById("codeImg");
        	  codeImg.src="${pageContext.request.contextPath}/KaptchaServlet?time="+new Date().getTime();
          }
          var flag='<%=flag%>';
          if(flag=="1"){
        	  alert("请登录系统");
          } 
        </script>
    </head>
    <body>
        <div class="login">
            <div class="header">
                <h1>
                    <a href="/login.do">登录</a>
                </h1>
                <button></button>
            </div>
            <form action="${pageContext.request.contextPath}/LoginServlet" method="post">
                <div class="name">
                    <input type="text" id="name" name="username" placeholder="用户名">
                    <p>${msg}</p>
                </div>
                <div class="pwd">
                    <input type="password" id="pwd" name="password" placeholder="密码">
                    <p></p>
                </div>
                <div class="code">
                    <input type="text" id="code" name="checkCode" placeholder="验证码" style="width: 150px">
                    &nbsp;&nbsp;&nbsp;&nbsp;
                    <img id="codeImg" onclick="changeImg()" src="${pageContext.request.contextPath}/KaptchaServlet" style="width: 150px;height: 42px;vertical-align: middle;">
                    <p></p>
                </div>
                <div class="btn-red">
                    <input type="submit" value="登录" id="login-btn">
                </div>
            </form>
        </div>
       
    </body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>修改图书信息</title>
        <link rel="stylesheet" href="css/bootstrap.min.css">
        <link rel="stylesheet" href="css/add.css">
    </head>
    <body>
        <nav class="navbar navbar-default">
            <div class="container">
                <div class="navbar-header">
                    <a class="navbar-brand" href="/dept/list.do">
                        图书信息管理
                    </a>
                </div>
            </div>
        </nav>
        <div class="container">
            <div class="jumbotron">
                <h1>Hello, XXX!</h1>
                <p>请小心的修改图书信息。。。</p>
            </div>
            <div class="page-header">
                <h3><small>修改</small></h3>
            </div>
            <form class="form-horizontal" action="/dept/add.do" method="post">

                <div class="form-group">
                    <label for="name" class="col-sm-2 control-label">图书编号 ：</label>
                    <div class="col-sm-8">
                        <input name="bookId" class="form-control" id="bookId" readonly="readonly">
                    </div>
                </div>
                <div class="form-group">
                    <label for="name" class="col-sm-2 control-label">图书名称 ：</label>
                    <div class="col-sm-8">
                        <input name="bookName" class="form-control" id="bookName">
                    </div>
                </div>
                <div class="form-group">
                    <label for="categoryId" class="col-sm-2 control-label">分类 ：</label>
                    <select id="categoryId" name="categoryId" class="col-sm-2 form-control" style="width: auto;margin-left: 15px">
                       <option value="ca0001" selected="">计算机</option>
                       <option value="ca0002">文学</option>
                       <option value="ca0003">历史</option>
                       <!-- 下拉列表的内容要从分类中进行读取，value值是分类id -->
                    </select>
                </div>

                 <div class="form-group">
                    <label for="name" class="col-sm-2 control-label">价格 ：</label>
                    <div class="col-sm-8">
                        <input name="bookPrice" class="form-control" id="bookPrice">
                    </div>
                  </div>
                   
                  <div class="form-group" >
                    <label for="name" class="col-sm-2 control-label">图书封面 ：</label>
                    <input type="file" id="bookPic" name="bookPic" style="padding-left: 15px">
                  </div>

                  <div class="form-group">
                    <label for="name" class="col-sm-2 control-label">备注 ：</label>
                    <div class="col-sm-8">
                        <input name="remarks" class="form-control" id="remarks">
                    </div>
                  </div>

                <div class="form-group">
                    <div class="col-sm-offset-2 col-sm-10">
                        <button type="submit" class="btn btn-primary">修改</button>&nbsp;&nbsp;&nbsp;
                    </div>
                </div>
            </form>
        </div>
        <footer class="text-center" >
            copy@imooc
        </footer>
    </body>
</html>

xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>test6_2</display-name>
  <servlet>
    <servlet-name>KaptchaServlet</servlet-name>
    <servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>
    <init-param>
     <param-name>kaptcha.textproducer.char.length</param-name>
     <param-value>4</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
  <servlet-name>KaptchaServlet</servlet-name>
  <url-pattern>/KaptchaServlet</url-pattern>
  </servlet-mapping>
  <filter>
    <filter-name>EncodeFilter</filter-name>
    <filter-class>com.imooc.filter.EncodeFilter</filter-class>
    <init-param>
    <param-name>charset</param-name>
    <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
  <filter-name>EncodeFilter</filter-name>
  <url-pattern>/*</url-pattern>
  </filter-mapping>
  <filter>
  <filter-name>AuthFilter</filter-name>
  <filter-class>com.imooc.filter.AuthFilter</filter-class>
  </filter>
  <filter-mapping>
  <filter-name>AuthFilter</filter-name>
  <url-pattern>/categoryList.jsp</url-pattern>
  </filter-mapping>

</web-app>

jar包和js

http://img1.sycdn.imooc.com//climg/5d689f910001a66203170281.jpg
Mr__Gao 2019-08-30
源自：项目：登录注册功能   6-2 项目作业
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4回答
好帮手慕柯南 2019-09-01 09:48:30

同学你好！
1.clean一下项目，重新启动测试一下

2.如果不可以，同学找到项目在tomcat下部署的位置，删除，重新编译一下项目

如果我的回答解决了你的疑惑，请采纳，祝学习愉快~

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  • 提问者 Mr__Gao #1
    我按照这些做了，项目也重新编译了，还是出现这个错误
    2019-09-01 10:21:05
好帮手慕阿莹 2019-08-31 11:22:12

同学你好，如下报错的意思是没有加载到这DeferrdeFileOutputStream，有可能是jar包没有加载好

http://img1.sycdn.imooc.com//climg/5d69e30a0001c5a207040350.jpg

建议同学在jar包上右键，看看有没有如下图这个选项：

http://img1.sycdn.imooc.com//climg/5d69e79e00011cfd05100049.jpg

如果有，请同学把所有的jar包都 add 一下，重启项目后在试试。

如果我的回答解决了你的疑惑，请采纳！祝学习愉快！

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  • 提问者 Mr__Gao #1
    老师，我全部都重新添加了一下，可是还是不行，还是这个错误
    2019-08-31 22:43:29
  • 好帮手慕柯南 回复 提问者 Mr__Gao #2
    同学重新创建一个项目测试看一下。祝学习愉快~
    2019-09-01 11:21:25
  • 提问者 Mr__Gao 回复 好帮手慕柯南 #3
    问题解决了 ，我上传了2个commons-fileupload，没上传io
    2019-09-01 11:51:03
点开查看后面1条评论
提问者 Mr__Gao 2019-08-30 19:05:46

http://img1.sycdn.imooc.com//climg/5d6902bb000140bd07870687.jpg


再新增图书信息点击保存完以后就这样了

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好帮手慕小班 2019-08-30 16:43:50

同学你好，这里建议同学能够将具体的报错信息贴出，是哪里的页面在跳转时报出错误，具体报错了500中的什么错误，还有建议同学将jsp页面的名称具体标识一下，便于我们复制运行代码。

如果我的回答解决了你的疑惑，请采纳！祝学习愉快！

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  • 提问者 Mr__Gao #1
    老师，图和问题发在下边了
    2019-08-30 19:06:16
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