servlet包ControlServlet类

private void delBook(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        String bookId = request.getParameter("bookId");
        if (bookId != null && !"".equals(bookId)) {
            s.delBook(bookId);
            request.setAttribute("msg", "删除图书分类成功！");
            request.getRequestDispatcher("/message.jsp").forward(request,
                    response);
            return;
        }
        System.out.println("是不是空");
        response.sendRedirect(request.getContextPath() + "/error.jsp");

    }

    //编辑分类：更新内容
    private void editCategory(HttpServletRequest request,
            HttpServletResponse response) {

        try {
            Category category = new Category();

            BeanUtils.populate(category, request.getParameterMap());

            System.out.println("id" + category.getId());

            s.editCategory(category);

            request.setAttribute("msg", "修改分类成功！");

            request.getRequestDispatcher("/message.jsp").forward(request,
                    response);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

    //编辑分类： 回显数据
    private void editCategoryView(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {

        String categoryId = request.getParameter("categoryId");

        Category c = s.findCategoryById(categoryId);

        request.setAttribute("c", c);

        request.getRequestDispatcher("/edit.jsp").forward(request, response);
    }

    //删除分类
    private void delCategory(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        String categoryId = request.getParameter("categoryId");
        if (categoryId != null && !"".equals(categoryId)) {
            s.delCategory(categoryId);
            request.setAttribute("msg", "删除图书分类成功！");
            request.getRequestDispatcher("/message.jsp").forward(request,
                    response);
            return;
        }
        System.out.println("是不是空");
        response.sendRedirect(request.getContextPath() + "/error.jsp");
    }

    //分页查询图书
    private void showBook(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        String pagenum = request.getParameter("pagenum");

        List<Category> cs = s.findAllCategory();

        request.setAttribute("cs", cs);
        Page page = s.findAllBook(pagenum);

        page.setUrl("servlet/ControlServlet?op=showBook");

        request.setAttribute("page", page);
        request.getRequestDispatcher("/bookList.jsp")
                .forward(request, response);
    }

    //添加图书
    private void addBook(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {

        try {
            boolean isMultipart = ServletFileUpload.isMultipartContent(request);
            if (!isMultipart) {
                request.setAttribute("msg", "亲，您的表单填写有误，请检查！");
                request.getRequestDispatcher("/message.jsp").forward(request,
                        response);
                return;
            }
            DiskFileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload upload = new ServletFileUpload(factory);
            List<FileItem> items = upload.parseRequest(request);
            for (FileItem item : items) {
                if (item.isFormField()) {
                    String fieldName = item.getFieldName();
                    String fieldValue = item.getString(request
                            .getCharacterEncoding());
                    BeanUtils.setProperty(book, fieldName, fieldValue);
                } else {
                    String fieldName = item.getName();
                    if (fieldName != null && !fieldName.trim().equals("")) {
                        fieldName = UUID.randomUUID().toString() + "."
                                + FilenameUtils.getExtension(fieldName);
                        String storeDirectory = getServletContext()
                                .getRealPath("/images/");
                        // 路径
                        String path = SetPhotoPath.makeDir(storeDirectory,
                                fieldName);

                        // String path = "";//如果不需要设置多级目录（打散） 可以放开此句话
                        book.setPath(path);
                        book.setPhotoName(fieldName);

                        // 上传
                        item.write(new File(storeDirectory + path + "/"
                                + fieldName));

                    }
                }
            }
            s.addBook(book);
            request.setAttribute("msg", "添加图书成功");
            request.getRequestDispatcher("/message.jsp").forward(request,
                    response);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

    //带着分类名称去跳转到添加图书界面
    private void addBookView(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        List<Category> cs = s.findAllCategory();
        request.setAttribute("cs", cs);
        request.getRequestDispatcher("/addBook.jsp").forward(request, response);

    }

    //用户登录
    private void userLogin(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        String type = request.getParameter("type");

        User u = s.userLogin(username, password, type);
        if (u != null) {
            // session 表示会话 cookie
            HttpSession session = request.getSession();
            session.setAttribute("u", u);
            if ("管理员".equals(u.getType())) {
                response.sendRedirect(request.getContextPath() + "/main.jsp");
                return;
            } else {
                response.sendRedirect(request.getContextPath() + "/index.jsp");
                return;
            }

        } else {
            request.setAttribute("msg", "登录有误！");
            request.getRequestDispatcher("/message.jsp").forward(request,
                    response);
        }

    }

    //用户注册
    private void userRegister(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {

        User user;
        try {
            user = new User();
            BeanUtils.populate(user, request.getParameterMap());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        System.out.println("username:" + user.getUsername());

        s.userRegister(user);

        request.setAttribute("msg", "用户注册成功！");
        request.getRequestDispatcher("/message.jsp").forward(request, response);
    }

    //查询所有分类
    private void findAllCategory(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        List<Category> cs = s.findAllCategory();
        request.setAttribute("cs", cs);
        request.getRequestDispatcher("/categoryList.jsp").forward(request,
                response);

    }

    //添加分类
    private void addCategory(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {

        Category category = new Category();
        String name = request.getParameter("name");
        String description = request.getParameter("description");

        category.setName(name);
        category.setDescription(description);
        System.out.println("分类" + category);

        System.out.println("分类名称：" + category.getName());
        s.addCategory(category);
        request.setAttribute("msg", "添加分类成功！");
        request.getRequestDispatcher("/message.jsp").forward(request, response);

    }

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

}

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 exception包AddBookException类

public class AddBookException extends RuntimeException {

    public AddBookException() {
        // TODO Auto-generated constructor stub
    }

    public AddBookException(String message) {
        super(message);
        // TODO Auto-generated constructor stub
    }

    public AddBookException(Throwable cause) {
        super(cause);
        // TODO Auto-generated constructor stub
    }

    public AddBookException(String message, Throwable cause) {
        super(message, cause);
        // TODO Auto-generated constructor stub
    }

}

View Code