基于Java语言的Servlet技术完成的图书管理系统源码+部署教程.zip

package com.bite.mybook.action; import com.alibaba.fastjson.JSON; import com.bite.mybook.bean.Book; import com.bite.mybook.biz.BookBiz; import com.bite.mybook.util.DateHelper; 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 javax.servlet.ServletException; 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 java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.util.List; /* * 1. query 查询 * 2. * */ @WebServlet("/book") public class BookServlet extends HttpServlet { // Book类型的业务操作对象 BookBiz bookBiz = new BookBiz(); @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); } /** * /book?type=add 添加图书 * /book?type=modifypre&id=xx 修改前准备 * /book?type=modify 修改 * /book?type=remove&id=xx 删除 * /book?type=query&pageIndex=1 :分页查询(request:转发) * /book?type=details&id=xx 展示书籍详细信息 * /book?type=doajax&name=xx :使用ajax查询图书名对应的图书信息 * * @param req * @param resp * @throws ServletException * @throws IOException */ @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.setCharacterEncoding("utf-8"); resp.setContentType("text/html;charset=utf-8"); PrintWriter out = resp.getWriter(); //验证用户是否登录 HttpSession session = req.getSession(); if (session.getAttribute("user") == null) { out.println("<script>alert('请登录');parent.window.location.href='login.html';</script>"); return; } String type = req.getParameter("type"); switch (type) { case "add": try { add(req, resp, out); } catch (FileUploadException e) { e.printStackTrace(); resp.sendError(500, "文件上传失败"); } catch (Exception e) { e.printStackTrace(); resp.sendError(500, e.getMessage()); } break; case "modifypre": //book?type=modifypre&id=xx long bookId = Long.parseLong(req.getParameter("id")); Book book = bookBiz.getBookByBookId(bookId); req.setAttribute("book", book); req.getRequestDispatcher("book_modify.jsp").forward(req, resp); break; case "modify": try { modify(req, resp, out); } catch (Exception e) { e.printStackTrace(); } break; case "remove": //1.获取删除的bookid long removeId = Long.parseLong(req.getParameter("id")); //2. 调用biz删除方法 try { boolean count = bookBiz.remove(removeId); if (count) { out.println("<script>alert('图书删除成功'); location.href='book?type=query&pageIndex=1';</script>"); } else { out.println("<script>alert('图书删除失败'); location.href='book?type=query&pageIndex=1';</script>"); } } catch (Exception e) { e.printStackTrace(); out.println("<script>alert('" + e.getMessage() + "'); location.href='book?type=query&pageIndex=1';</script>"); } //3. 提示+跳转=>out (查询的servlet) break; case "query": query(req, resp, out); break; case "details": details(req, resp, out); break; case "doajax": String name = req.getParameter("name"); Book book2 = bookBiz.getBookByName(name); if (book2 == null) { out.print("{}");//null json 对象 } else { out.print(JSON.toJSONString(book2)); } break; default: resp.sendError(404); } } /** * 修改图书信息的方法 * * @param req * @param resp * @param out */ private void modify(HttpServletRequest req, HttpServletResponse resp, PrintWriter out) throws Exception { //1.构建一个磁盘工厂 DiskFileItemFactory factory = new DiskFileItemFactory(); //1.1 设置大小 factory.setSizeThreshold(1024 * 9); //1.2 临时仓库 File file = new File("c:\\temp"); if (!file.exists()) { file.mkdir();//创建文件夹 } factory.setRepository(file); //2.文件上传+表单数据 ServletFileUpload fileUpload = new ServletFileUpload(factory); //3.将请求解析成一个个FileItem(文件+表单元素) List<FileItem> fileItems = fileUpload.parseRequest(req); //4.遍历FileItem Book book = new Book(); for (FileItem item : fileItems) { if (item.isFormField()) { //4.1 元素名称和用户填写的值 name: 文城 String name = item.getFieldName(); String value = item.getString("utf-8");//防止乱码 switch (name) { case "id": book.setId(Long.parseLong(value)); break; case "pic": book.setPic(value); break; case "typeId": book.setTypeId(Long.parseLong(value)); break; case "name": book.setName(value); break; case "price": book.setPrice(Double.parseDouble(value)); break; case "desc": book.setDesc(value); break; case "publish": book.setPublish(value); break; case "author": book.setAuthor(value); break; case "stock": book.setStock(Long.parseLong(value)); break; case "address": book.setAddress(value); break; } } else { //4.2 文件: 图片的文件名 文城.png,用户不选择图片时，fileName的数据为"" String fileName = item.getName(); //避免文件替换：当前的系统时间.png if (fileName.trim().length() > 0) { //4.2.1 获取后缀名 .png String filterName = fileName.substring(fileName.lastIndexOf(".")); //4.2.2 修改文件名 20211117112512234.png fileName = DateHelper.getImageName() + filterName; //保存到哪里 //虚拟路径: Images/cover/1-1.png //文件的读写:实际路径 D://xx --> 虚拟路径: Images/cover对应的实际路径 String path = req.getServletContext().getRealPath("/Images/cover")