書城後臺管理的增刪改查功能以及分頁實現
阿新 • • 發佈：2019-06-18
點選圖書管理按鈕進入圖書管理列表
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <div> <a href="BookServlet?method=getBooksByPage">圖書管理</a> <a href="pages/manager/order_manager.jsp">訂單管理</a> <a href="index.jsp">返回商城</a> </div>
對於根據頁面值傳送請求還是第一次進入頁面的請求做了判斷，判斷如下：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>圖書管理</title> <%@ include file="/WEB-INF/include/base.jsp" %> <script type="text/javascript"> $(function(){ $(".dela").click(function(){ // var title = $(this).parents("tr").children().html(); var title = $(this).attr("id"); if(confirm("確定刪除【"+title+"】嗎？") == false){ return false; } }); //實現確定按鈕分頁查詢 $("#sub_page").click(function(){ //取pageNo值 var pageNo = $("#pn_input").val(); //請求BookServlet location = "BookServlet?method=getBooksByPage&pageNo="+pageNo; }); }); </script> </head> <body> <div id="header"> <img class="logo_img" alt="" src="static/img/logo.gif" > <span class="wel_word">圖書管理系統</span> <%@ include file="/WEB-INF/include/header.jsp" %> </div> <div id="main"> <table> <tr> <td>名稱</td> <td>價格</td> <td>作者</td> <td>銷量</td> <td>庫存</td> <td colspan="2">操作</td> </tr> <c:forEach items="${requestScope.page.list }" var="book"> <tr> <td>${book.title }</td> <td>${book.price }</td> <td>${book.author }</td> <td>${book.sales }</td> <td>${book.stock }</td> <td><a href="BookServlet?method=getBookById&bookId=${book.id }">修改</a></td> <td><a class="dela" id="${book.title }" href="BookServlet?method=delBookById&bookId=${book.id }">刪除</a></td> </tr> </c:forEach> <tr> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td><a href="pages/manager/book_update.jsp">新增圖書</a></td> </tr> </table> <br> <br> <div id="page_nav"> <a href="BookServlet?method=getBooksByPage&pageNo=1">首頁</a> <c:if test="${page.pageNo>1 }"> <a href="BookServlet?method=getBooksByPage&pageNo=${page.pageNo-1 }">上一頁</a> </c:if> <c:if test="${page.pageNo<page.totalPageNo }"> <a href="BookServlet?method=getBooksByPage&pageNo=${page.pageNo+1 }">下一頁</a> </c:if> <a href="BookServlet?method=getBooksByPage&pageNo=${page.totalPageNo }">末頁</a> 共${requestScope.page.pageNo }/${requestScope.page.totalPageNo }頁，${requestScope.page.totalRecord}條記錄 到第<input value="${requestScope.page.pageNo }" name="pn" id="pn_input"/>頁 <input id="sub_page" type="button" value="確定"> </div> </div> <div id="bottom"> <span> 尚矽谷書城.Copyright ©2015 </span> </div> </body> </html>
package com.atguigu.bean; import java.io.Serializable; import java.util.List; public class Page<T> implements Serializable { /** * */ private static final long serialVersionUID = 1L; // 5/19 private int pageNo; //當前頁碼 使用者 private int totalPageNo; //總頁數=總條數/每頁顯示的個數 計算 private int totalRecord; //總條數 dao,sql:select count(*) from books public static final int PAGE_SIZE = 4; //每頁顯示的個數 靜態常量 private List<T> list; //當前頁的資料集合 dao,sql:SELECT * FROM books LIMIT (pageNo-1)*PAGE_SIZE,PAGE_SIZE public int getPageNo() { if(pageNo < 1) { return 1; } if(pageNo > getTotalPageNo()) { return getTotalPageNo(); } return pageNo; } public void setPageNo(int pageNo) { this.pageNo = pageNo; } /** * 計算總頁數 * @return */ public int getTotalPageNo() { return totalRecord%PAGE_SIZE==0?totalRecord/PAGE_SIZE:totalRecord/PAGE_SIZE+1; } public void setTotalPageNo(int totalPageNo) { this.totalPageNo = totalPageNo; } public int getTotalRecord() { return totalRecord; } public void setTotalRecord(int totalRecord) { this.totalRecord = totalRecord; } public List<T> getList() { return list; } public void setList(List<T> list) { this.list = list; } // public static int getPageSize() { // return PAGE_SIZE; // } public Page(int pageNo, int totalPageNo, int totalRecord, List<T> list) { super(); this.pageNo = pageNo; this.totalPageNo = totalPageNo; this.totalRecord = totalRecord; this.list = list; } public Page() { super(); // TODO Auto-generated constructor stub } @Override public String toString() { return "Page [pageNo=" + pageNo + ", totalPageNo=" + totalPageNo + ", totalRecord=" + totalRecord + ", list=" + list + "]"; } }
package com.atguigu.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.atguigu.bean.Book;
import com.atguigu.bean.Page;
import com.atguigu.service.BookService;
import com.atguigu.service.impl.BookServiceImpl;
/**
* Servlet implementation class BookServlet
*/
public class BookServlet extends BaseServlet {
private static final long serialVersionUID = 1L;
private BookService bookService = new BookServiceImpl();
/**
* 查詢所有book資訊
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
// protected void getAllBooks(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// //取值（不用）
// //呼叫service中的相應方法
// List<Book> books = bookService.getAllBooks();
// //將books存放到域中
// request.setAttribute("books",books);
// //跳轉,book_manager.jsp
// request.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(request, response);
// }
/**
* 分頁查詢book
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
protected void getBooksByPage(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//取值
String pageNo = request.getParameter("pageNo");
//呼叫service
Page<Book> page = bookService.getBookByPage(pageNo);
//將page存放到域中
request.setAttribute("page", page);
//跳轉
request.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(request, response);
}
/**
* 新增book資訊
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
protected void delBookById(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//取值
String bookId = request.getParameter("bookId");
//呼叫service
bookService.delBookById(bookId);
//跳轉
response.sendRedirect(request.getContextPath()+"/BookServlet?method=getBooksByPage");
}
/**
* 通過id獲取book資訊
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
protected void getBookById(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//取bookid值
String id = request.getParameter("bookId");
//呼叫Service
Book book = bookService.getBookById(id);
//將book存放域中
request.setAttribute("book", book);
//跳轉,book_update.jsp
request.getRequestDispatcher("/pages/manager/book_update.jsp").forward(request, response);
}
/**
* 新增book資訊
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
// protected void addBook(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// //取值
// String title = request.getParameter("title");
// String author = request.getParameter("author");
// String price = request.getParameter("price");
// String sales = request.getParameter("sales");
// String stock = request.getParameter("stock");
// //呼叫service
// bookService.addBook(new Book(null, title, author, Double.parseDouble(price), Integer.parseInt(sales), Integer.parseInt(stock), null));
// //跳轉,重新查詢,book_manager.jsp
//// getAllBooks(request, response);
// response.sendRedirect(request.getContextPath()+"/BookServlet?method=getAllBooks");
// }
/**
* 通過id獲取book資訊
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
protected void updateBook(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//取值
String id = request.getParameter("bookId");
String title = request.getParameter("title");
String author = request.getParameter("author");
String price = request.getParameter("price");
String sales = request.getParameter("sales");
String stock = request.getParameter("stock");
//通過判斷id值是否為空，執行相應方法
//呼叫service
if(id == null || "".equals(id)) {
//呼叫addBook()
bookService.addBook(new Book(null, title, author, Double.parseDouble(price), Integer.parseInt(sales), Integer.parseInt(stock), null));
}else {
//呼叫updateBook()
bookService.updateBook(new Book(Integer.parseInt(id), title, author, Double.parseDouble(price), Integer.parseInt(sales), Integer.parseInt(stock), null));
}
//跳轉
response.sendRedirect(request.getContextPath()+"/BookServlet?method=getBooksByPage");
}
}
package com.atguigu.service.impl;
import java.util.List;
import com.atguigu.bean.Book;
import com.atguigu.bean.Page;
import com.atguigu.dao.BookDao;
import com.atguigu.dao.impl.BookDaoImpl;
import com.atguigu.service.BookService;
public class BookServiceImpl implements BookService {
private BookDao bookDao = new BookDaoImpl();
@Override
public List<Book> getAllBooks() {
return bookDao.getAllBooks();
}
@Override
public void addBook(Book book) {
bookDao.addBook(book);
}
@Override
public void delBookById(String id) {
bookDao.delBookById(id);
}
@Override
public Book getBookById(String id) {
return bookDao.getBookById(id);
}
@Override
public void updateBook(Book book) {
bookDao.updateBook(book);
}
@Override
public Page<Book> getBookByPage(String pageNo) {
Page<Book> page = new Page<Book>();
int pNo = 1;//先設定為1，保證第一次訪問頁面時有值
try {
//若傳入的有具體的值，就按具體的值來pageNo為String型別的Integer.parseInt(PageNo)
//萬一不可預知原因PageNo為null，那麼程式直接崩掉，防止這個捕獲一下
pNo = Integer.parseInt(pageNo);
} catch (NumberFormatException e) {
// e.printStackTrace();
}
page.setPageNo(pNo);
return bookDao.getBooksByPage(page);
}
@Override
public Page<Book> getBookByPageAndPrice(String pageNo, String min, String max) {
Page<Book> page = new Page<Book>();
int pNo = 1;
try {
pNo = Integer.parseInt(pageNo);
} catch (NumberFormatException e) {
// e.printStackTrace();
}
page.setPageNo(pNo);
//處理min，max
double minEnd = 0;
double maxEnd = Double.MAX_VALUE;
try {
minEnd = Double.parseDouble(min);
maxEnd = Double.parseDouble(max);
//交換值
double temp=0;
if(minEnd > maxEnd) {
temp = minEnd;
minEnd = maxEnd;
maxEnd = temp;
}
} catch (NumberFormatException e) {
// e.printStackTrace();
}
return bookDao.getBooksByPageAndPrice(page, minEnd, maxEnd);
}
}
package com.atguigu.dao.impl;
import java.util.List;
import com.atguigu.bean.Book;
import com.atguigu.bean.Page;
import com.atguigu.dao.BaseDao;
import com.atguigu.dao.BookDao;
public class BookDaoImpl extends BaseDao<Book> implements BookDao {
@Override
public List<Book> getAllBooks() {
String sql = "SELECT id,title,author,price,sales,stock,img_path FROM books";
return this.getBeanList(sql);
}
@Override
public void addBook(Book book) {
String sql = "insert into books(title,author,price,sales,stock,img_path) values(?,?,?,?,?,?)";
this.update(sql, book.getTitle(),book.getAuthor(),book.getPrice(),book.getSales(),book.getStock(),book.getImgPath());
}
@Override
public void delBookById(String id) {
String sql = "delete from books where id = ?";
this.update(sql, id);
}
@Override
public Book getBookById(String id) {
String sql = "SELECT id,title,author,price,sales,stock,img_path FROM books WHERE id = ?";
return this.getBean(sql, id);
}
@Override
public void updateBook(Book book) {
String sql = "update books set title=?,author=?,price=?,sales=?,stock=? where id=?";
this.update(sql, book.getTitle(),book.getAuthor(),book.getPrice(),book.getSales(),book.getStock(),book.getId());
}
@Override
public void updateBook(int stock, int sales, int id) {
String sql = "update books set sales=?,stock=? where id=?";
this.update(sql,sales,stock,id);
}
@Override
public void updateBook(Object[][] params) {
String sql = "update books set sales=?,stock=? where id=?";
this.batchUpdate(sql,params);
}
@Override
public Page<Book> getBooksByPage(Page<Book> page) {
//page:pageNo PAGE_SIZE totalPageNo
//dao:totalRecord
String sql = "select count(*) from books";
//long（int） Integer.parse 強轉是為了防止報錯，this.getSingeValue(sql)返回值為long
//long怎麼轉為Integer呢？先+""然後再進行轉換
int count = Integer.parseInt(this.getSingeValue(sql)+"");
//將totalRecord賦值
page.setTotalRecord(count);//資料總條數
// System.out.println("record:"+page.getTotalRecord());
// System.out.println("pageNo:"+page.getTotalPageNo());
//dao:list
String sql2 = "SELECT id,title,author,price,sales,stock,img_path "
+ "FROM books "
+ "WHERE 1=1 "
+ "LIMIT ?,?";
//pageNo頁從(page.getPageNo()-1)*Page開始為第一條資料，Page.PAGE_SIZE為一頁展示多少條資料
List<Book> list = this.getBeanList(sql2, (page.getPageNo()-1)*Page.PAGE_SIZE,Page.PAGE_SIZE);
//將list存放到page中
page.setList(list);
return page;
}
@Override
public Page<Book> getBooksByPageAndPrice(Page<Book> page,double min,double max) {
String sql = "SELECT count(*) "
+ "FROM books "
+ "WHERE 1=1 "
+ "AND price BETWEEN ? AND ?";
int count = Integer.parseInt(this.getSingeValue(sql, min,max)+""); //long（int） Integer.parse
//將totalRecord賦值
page.setTotalRecord(count);
//dao:list
String sql2 = "SELECT id,title,author,price,sales,stock,img_path "
+ "FROM books "
+ "WHERE 1=1 "
+ "AND price BETWEEN ? AND ? "
+ "LIMIT ?,?";
List<Book> list = this.getBeanList(sql2, min,max,(page.getPageNo()-1)*Page.PAGE_SIZE,Page.PAGE_SIZE);
//將list存放到page中
page.setList(list);
return page;
}
}