大项目之网上书城（四）——主页（下中）
- 主要改动
- 1.主页持续施工中
  - 代码
  - 效果图
- 2.index.js
  - 代码
  - 热度
- 3.Book,User表
  - 表结构
- 4.XinShuMingServlet
  - 代码
- 5.RegisterServlet
  - 代码
  - 效果图
- 6.UserServiceImpl
  - 代码
- 7.BookServiceImpl
- 8.总结

大项目之网上书城（四）——主页（下中）

我要更新啊！日更啊！

主要改动

今天完成了昨天计划的任务的准备工作的一部分，以及更早的一些思路，以及为以后筹划的一些思路。

具体点说，今天完成了按照数据库中re_du属性对新书进行排序后展示的功能。也就是说可以在数据库改变后页面做出相应变化。然后计划中为完成的是之前没接触过的往数据库中添加图片，并把这个图片显示到网页上的操作。然后热门推书漏掉了。

哦，还有对注册进行了小小的测试。

1.主页持续施工中

代码

几乎没变，添加了对热度的显示。

<!-- 新书上架中的每一项都加了一个id为re1-9的值来表示热度 -->
<div style="width:50%;height:63%;float:left;background-color:#a8f;margin-left:2%;margin-top:2%;"id="xinShu">
<table border="1"style="width:100%;height:100%"><tr><td><div style="width:94%;height:80%;background-color:white;margin-left:3%;float:left"><img alt="图书" src="${pageContext.request.contextPath}/XinShuImg?shu=1" style="width:100%;height:100%;"/></div><div style="width:94%;float:left;margin-left:3%;height:15%;"><font style="font-size:16px;margin-left:3%;"id="shu1">图书</font><font style="font-size:8px"id="re1"></font></div></td><!-- 新书榜中的列表，每一项加了一个id为r1-9的值来表示热度，同时将本来在li上的id:x1-9移到了li中的一个新的font中。 --><ul><li style="text-align:left;color:black"><font id="x1"></font><font id="r1" style="font-size:8px"></font></li><li style="text-align:left;color:black"><font id="x2"></font><font id="r2" style="font-size:8px"></font></li><li style="text-align:left;color:black"><font id="x3"></font><font id="r3" style="font-size:8px"></font></li><li style="text-align:left;color:black"><font id="x4"></font><font id="r4" style="font-size:8px"></font></li><li style="text-align:left;color:black"><font id="x5"></font><font id="r5" style="font-size:8px"></font></li><li style="text-align:left;color:black"><font id="x6"></font><font id="r6" style="font-size:8px"></font></li><li style="text-align:left;color:black"><font id="x7"></font><font id="r7" style="font-size:8px"></font></li><li style="text-align:left;color:black"><font id="x8"></font><font id="r8" style="font-size:8px"></font></li><li style="text-align:left;color:black"><font id="x9"></font><font id="r9" style="font-size:8px"></font></li></ul>

效果图

表为

时，显示效果为：

表为

时，显示效果为：

2.index.js

超大改动，for循环post的方法竟然失败了，于是我单着一个一个写了。。。建议不要学。

代码

$(function(){//动态显示初始轮播图$("#lun").css("background-image","Url('img/tu1.jpg')");//通过点击切换轮播图$("#l1").click(function(){$("#lun").css("background-image","Url('img/tu1.jpg')");     });$("#l2").click(function(){$("#lun").css("background-image","Url('img/tu2.jpg')");     });$("#l3").click(function(){$("#lun").css("background-image","Url('img/tu3.jpg')");     });$("#l4").click(function(){$("#lun").css("background-image","Url('img/tu4.jpg')");     });//动态显示初始热门书$.post("../ReMen?page=1",function(data){var code=data;code=code.split("#");$("#a1").html(code[0]);$("#a2").html(code[1]);});//动态显示初始新书和初始新书榜$.post("../XinShuMing?shu=1",function(data){data = data.split("@")$("#shu1").html(1+"."+data[0]);$("#x1").html(1+"."+data[0]);$("#re1").html("热度:"+data[1]);$("#r1").html("热度:"+data[1]);});$.post("../XinShuMing?shu=2",function(data){data = data.split("@")$("#shu2").html(2+"."+data[0]);$("#x2").html(2+"."+data[0]);$("#re2").html("热度:"+data[1]);$("#r2").html("热度:"+data[1]);});$.post("../XinShuMing?shu=3",function(data){data = data.split("@")$("#shu3").html(3+"."+data[0]);$("#x3").html(3+"."+data[0]);$("#re3").html("热度:"+data[1]);$("#r3").html("热度:"+data[1]);});$.post("../XinShuMing?shu=4",function(data){data = data.split("@")$("#shu4").html(4+"."+data[0]);$("#x4").html(4+"."+data[0]);$("#re4").html("热度:"+data[1]);$("#r4").html("热度:"+data[1]);});$.post("../XinShuMing?shu=5",function(data){data = data.split("@")$("#shu5").html(5+"."+data[0]);$("#x5").html(5+"."+data[0]);$("#re5").html("热度:"+data[1]);$("#r5").html("热度:"+data[1]);});$.post("../XinShuMing?shu=6",function(data){data = data.split("@")$("#shu6").html(6+"."+data[0]);$("#x6").html(6+"."+data[0]);$("#re6").html("热度:"+data[1]);$("#r6").html("热度:"+data[1]);});$.post("../XinShuMing?shu=7",function(data){data = data.split("@")$("#shu7").html(7+"."+data[0]);$("#x7").html(7+"."+data[0]);$("#re7").html("热度:"+data[1]);$("#r7").html("热度:"+data[1]);});$.post("../XinShuMing?shu=8",function(data){data = data.split("@")$("#shu8").html(8+"."+data[0]);$("#x8").html(8+"."+data[0]);$("#re8").html("热度:"+data[1]);$("#r8").html("热度:"+data[1]);});$.post("../XinShuMing?shu=9",function(data){data = data.split("@")$("#shu9").html(9+"."+data[0]);$("#x9").html(9+"."+data[0]);$("#re9").html("热度:"+data[1]);$("#r9").html("热度:"+data[1]);});//通过点击b5,b6,b7,b8,将前1到36展示在页面上。$("#b5").click(function(){$.post("../XinShuMing?shu=1",function(data){data = data.split("@")$("#x1").html(1+"."+data[0]);$("#r1").html("热度:"+data[1]);});$.post("../XinShuMing?shu=2",function(data){data = data.split("@")$("#x2").html(2+"."+data[0]);$("#r2").html("热度:"+data[1]);});$.post("../XinShuMing?shu=3",function(data){data = data.split("@")$("#x3").html(3+"."+data[0]);$("#r3").html("热度:"+data[1]);});$.post("../XinShuMing?shu=4",function(data){data = data.split("@")$("#x4").html(4+"."+data[0]);$("#r4").html("热度:"+data[1]);});$.post("../XinShuMing?shu=5",function(data){data = data.split("@")$("#x5").html(5+"."+data[0]);$("#r5").html("热度:"+data[1]);});$.post("../XinShuMing?shu=6",function(data){data = data.split("@")$("#x6").html(6+"."+data[0]);$("#r6").html("热度:"+data[1]);});$.post("../XinShuMing?shu=7",function(data){data = data.split("@")$("#x7").html(7+"."+data[0]);$("#r7").html("热度:"+data[1]);});$.post("../XinShuMing?shu=8",function(data){data = data.split("@")$("#x8").html(8+"."+data[0]);$("#r8").html("热度:"+data[1]);});$.post("../XinShuMing?shu=9",function(data){data = data.split("@")$("#x9").html(9+"."+data[0]);$("#r9").html("热度:"+data[1]);});});$("#b6").click(function(){$.post("../XinShuMing?shu=10",function(data){$("#x1").html(10+"."+data);$("#r1").html("热度:"+data[1]);});$.post("../XinShuMing?shu=11",function(data){$("#x2").html(11+"."+data);$("#r2").html("热度:"+data[1]);});$.post("../XinShuMing?shu=12",function(data){$("#x3").html(12+"."+data);$("#r3").html("热度:"+data[1]);});$.post("../XinShuMing?shu=13",function(data){$("#x4").html(13+"."+data);$("#r4").html("热度:"+data[1]);});$.post("../XinShuMing?shu=14",function(data){$("#x5").html(14+"."+data);$("#r5").html("热度:"+data[1]);});$.post("../XinShuMing?shu=15",function(data){$("#x6").html(15+"."+data);$("#r6").html("热度:"+data[1]);});$.post("../XinShuMing?shu=16",function(data){$("#x7").html(16+"."+data);$("#r7").html("热度:"+data[1]);});$.post("../XinShuMing?shu=17",function(data){$("#x8").html(17+"."+data);$("#r8").html("热度:"+data[1]);});$.post("../XinShuMing?shu=18",function(data){$("#x9").html(18+"."+data);$("#r9").html("热度:"+data[1]);});});$("#b7").click(function(){$.post("../XinShuMing?shu=19",function(data){$("#x1").html(19+"."+data);$("#r1").html("热度:"+data[1]);});$.post("../XinShuMing?shu=20",function(data){$("#x2").html(20+"."+data);$("#r2").html("热度:"+data[1]);});$.post("../XinShuMing?shu=21",function(data){$("#x3").html(21+"."+data);$("#r3").html("热度:"+data[1]);});$.post("../XinShuMing?shu=22",function(data){$("#x4").html(22+"."+data);$("#r4").html("热度:"+data[1]);});$.post("../XinShuMing?shu=23",function(data){$("#x5").html(23+"."+data);$("#r5").html("热度:"+data[1]);});$.post("../XinShuMing?shu=24",function(data){$("#x6").html(24+"."+data);$("#r6").html("热度:"+data[1]);});$.post("../XinShuMing?shu=25",function(data){$("#x7").html(25+"."+data);$("#r7").html("热度:"+data[1]);});$.post("../XinShuMing?shu=26",function(data){$("#x8").html(26+"."+data);$("#r8").html("热度:"+data[1]);});$.post("../XinShuMing?shu=27",function(data){$("#x9").html(27+"."+data);$("#r9").html("热度:"+data[1]);});});$("#b8").click(function(){$.post("../XinShuMing?shu=28",function(data){$("#x1").html(28+"."+data);$("#r1").html("热度:"+data[1]);});$.post("../XinShuMing?shu=29",function(data){$("#x2").html(29+"."+data);$("#r2").html("热度:"+data[1]);});$.post("../XinShuMing?shu=30",function(data){$("#x3").html(30+"."+data);$("#r3").html("热度:"+data[1]);});$.post("../XinShuMing?shu=31",function(data){$("#x4").html(31+"."+data);$("#r4").html("热度:"+data[1]);});$.post("../XinShuMing?shu=32",function(data){$("#x5").html(32+"."+data);$("#r5").html("热度:"+data[1]);});$.post("../XinShuMing?shu=33",function(data){$("#x6").html(33+"."+data);$("#r6").html("热度:"+data[1]);});$.post("../XinShuMing?shu=34",function(data){$("#x7").html(34+"."+data);$("#r7").html("热度:"+data[1]);});$.post("../XinShuMing?shu=35",function(data){$("#x8").html(35+"."+data);$("#r8").html("热度:"+data[1]);});$.post("../XinShuMing?shu=36",function(data){$("#x9").html(36+"."+data);$("#r9").html("热度:"+data[1]);});});//通过点击b1,b2,b3,b4，配合以特殊的查询方式，将前8的热门书展示在页面上。$("#b1").click(function(){$.post("../ReMen?page=1",function(data){var code=data;code=code.split("#");$("#a1").html(code[0]);$("#a2").html(code[1]);});});$("#b2").click(function(){$.post("../ReMen?page=2",function(data){var code=data;code=code.split("#");$("#a1").html(code[0]);$("#a2").html(code[1]);});});$("#b3").click(function(){$.post("../ReMen?page=3",function(data){var code=data;code=code.split("#");$("#a1").html(code[0]);$("#a2").html(code[1]);});});$("#b4").click(function(){$.post("../ReMen?page=4",function(data){var code=data;code=code.split("#");$("#a1").html(code[0]);$("#a2").html(code[1]);});     });
});

热度

总得有人好奇下这个热度是怎么来的吧，他是根据book表中的点击量和购买量来计算的哦。恩，先放触发器，表结构一会儿放。emmmm，查询一不小心删了，这是从sql文件里扒出来的~

DROP TRIGGER IF EXISTS `book_insert`;
DELIMITER ;;
CREATE TRIGGER `book_insert` BEFORE INSERT ON `book` FOR EACH ROW beginset NEW.re_du = NEW.click_num + NEW.buy_num * 100;
end
;;
DELIMITER ;
DROP TRIGGER IF EXISTS `book_update`;
DELIMITER ;;
CREATE TRIGGER `book_update` BEFORE UPDATE ON `book` FOR EACH ROW beginset NEW.re_du = NEW.click_num + NEW.buy_num * 100;
end
;;
DELIMITER ;

3.Book,User表

表结构

book表

user表

4.XinShuMingServlet

代码

这个就是js请求的servlet啦，返回对应排名的书的网址存储好的a标签，还有他的热度。

package cn.edu.bdu.mc.servlets;import java.io.IOException;
import java.sql.SQLException;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 cn.edu.bdu.mc.beans.Book;
import cn.edu.bdu.mc.services.BookService;
import cn.edu.bdu.mc.services.impls.BookServiceImpl;/*** Servlet implementation class XinShuServlet*/
@WebServlet("/XinShuMing")
public class XinShuMingServlet extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public XinShuMingServlet() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubtry {//通过js动态从数据库中取书名，以及书的路径，写成一个a标签。int shu = Integer.parseInt(request.getParameter("shu"));Book book = new Book();BookService bookService = new BookServiceImpl();book = bookService.findNewBookByPaiMing(shu);int reDu = book.getRe_du();String re_du = "";if(re_du==null) {String html = "暂无";response.getWriter().print(html);}else if(reDu>10000) {re_du = reDu/10000+"万";}else if(reDu>1000) {re_du = reDu/1000+"千";}else if(reDu>100) {re_du = reDu/100+"百";}else {re_du = reDu+"";}String html = "<a href='${pageContext.request.contextPath}/client/"+book.getClazz()+"/shu?er_id="+book.getSecond_id()+"' style='font-size:16px'>"+book.getBook_name()+"</a>@"+re_du;response.getWriter().print(html);} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

5.RegisterServlet

代码

package cn.edu.bdu.mc.servlets;import java.io.IOException;
import java.sql.SQLException;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 cn.edu.bdu.mc.beans.User;
import cn.edu.bdu.mc.services.UserService;
import cn.edu.bdu.mc.services.impls.UserServiceImpl;/*** Servlet implementation class RegisterServlet*/
@WebServlet("/Register")
public class RegisterServlet extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public RegisterServlet() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubtry {String username = request.getParameter("username");String password = request.getParameter("password");String email = request.getParameter("email");String gender = request.getParameter("gender");String phone = request.getParameter("phone");String describtion = request.getParameter("describtion");User user = new User();user.setUsername(username);user.setPassword(password);user.setEmail(email);user.setGender(gender);if(phone!=null) {               user.setPhone(Integer.parseInt(phone));}user.setDescribtion(describtion);UserService userService = new UserServiceImpl();//如果注册失败,在register.jsp中用${errorMsg}来显示下提示信息。String msg = userService.register(user);if(msg.equals("root")) {request.setAttribute("errorMsg", "用户名不能为root");request.getRequestDispatcher("client/register.jsp").forward(request, response);}else if(msg.equals("user")) {request.setAttribute("errorMsg", "用户名已存在");request.getRequestDispatcher("client/register.jsp").forward(request, response);}else {//如果成功，进入login界面response.sendRedirect("client/login.jsp");}} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

效果图

6.UserServiceImpl

代码

package cn.edu.bdu.mc.services.impls;import java.sql.SQLException;import cn.edu.bdu.mc.beans.User;
import cn.edu.bdu.mc.daos.UserDao;
import cn.edu.bdu.mc.daos.impls.UserDaoImpl;
import cn.edu.bdu.mc.services.UserService;public class UserServiceImpl implements UserService {private static UserDao dao = new UserDaoImpl();@Overridepublic String register(User user) throws SQLException {// TODO Auto-generated method stubif("root".equals(user.getUsername())) {return "root";}if(dao.isExistedUsername(user.getUsername())) {return "user";}dao.addUser(user);return "success";}}

7.BookServiceImpl

package cn.edu.bdu.mc.services.impls;import java.sql.SQLException;import javax.sql.DataSource;import cn.edu.bdu.mc.beans.Book;
import cn.edu.bdu.mc.daos.BookDao;
import cn.edu.bdu.mc.daos.impls.BookDaoImpl;
import cn.edu.bdu.mc.services.BookService;
import cn.edu.bdu.mc.utils.JDBCUtil;public class BookServiceImpl implements BookService {private static DataSource dataSource = JDBCUtil.getDataSource();private static BookDao dao = new BookDaoImpl(); @Overridepublic Book findNewBookByPaiMing(int shu) throws SQLException {// TODO Auto-generated method stubreturn dao.findNewBookByPaiMing(shu);}/*其他都是基本操作，这个来在这里放一下代码吧，按理说这种操作不应该放在dao里，当时脑子没想清楚，就这样吧~private static DataSource dataSource = JDBCUtil.getDataSource();private static QueryRunner queryRunner = new QueryRunner(dataSource);       @Overridepublic Book findNewBookByPaiMing(int shu) throws SQLException {// TODO Auto-generated method stubString sql = "select * from (select * from book where is_new = 1 order by re_du desc)as book1 limit "+(shu-1)+",1";return queryRunner.query(sql, new BeanHandler<Book>(Book.class));}*/@Overridepublic void click(int book_id) throws SQLException {// TODO Auto-generated method stubBook book = dao.findBookById(book_id);book.setClick_num(book.getClick_num()+1);dao.update(book);}@Overridepublic void buy(int book_id) throws SQLException {// TODO Auto-generated method stubBook book = dao.findBookById(book_id);book.setBuy_num(book.getBuy_num()+1);dao.update(book);}
}