Javaweb——(day08)书城项目3-5
书城项目第三阶段
1.页面jsp动态化
1、在html页面顶行添加page指令。
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
2、修改文件后缀名为：.jsp
3、使用IDEA搜索替换.html为.jsp
替换结果，及运行检测：
2.抽取页面中相同的内容
1.head中css、jquery、base标签——head.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String basePath = request.getScheme()
+ "://"
+ request.getServerName()
+ ":"
+ request.getServerPort()
+ request.getContextPath()
+ "/";
%>
<html>
<head>
<title>Title</title>
</head>
<body>
<!--写base标签，永远固定相对路径跳转的结果-->
<base href="<%=basePath%>">
<link type="text/css" rel="stylesheet" href="static/css/style.css" >
<script type="text/javascript" src="static/script/jquery-1.7.2.js"></script>
</body>
</html>
<%-- 静态包含 base标签、css样式、jQuery文件 --%>
<%@ include file="/pages/common/head.jsp"%>
<script type="text/javascript">
2.每个页面的页脚——footer.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<div id="bottom">
<span>
PDD书城.Copyright ©2020
</span>
</div>
</body>
</html>
<%--静态包含页脚内容--%>
<%@include file="/pages/common/footer.jsp"%>
3.替换登录成功后的菜单——login_success_menu.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<div>
<span>欢迎<span class="um_span">subeiLY</span>光临PDD书城</span>
<a href="../order/order.jsp">我的订单</a>
<a href="../../index.jsp">注销</a>
<a href="../../index.jsp">返回</a>
</div>
</body>
</html>
<%--静态包含，登录 成功之后的菜单 --%>
<%@ include file="/pages/common/login_success_menu.jsp"%>
4.manager模块的菜单——manager_menu.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<div>
<a href="book_manager.jsp">图书管理</a>
<a href="order_manager.jsp">订单管理</a>
<a href="../../index.jsp">返回商城</a>
</div>
</body>
</html>
<%-- 静态包含 manager管理模块的菜单 --%>
<%@include file="/pages/common/manager_menu.jsp"%>
3.登录，注册错误提示，及表单回显
以登陆为例，Servlet程序端需要添加回显信息到Request域中:
// 把错误信息，和回显的表单项信息，保存到Request域中
req.setAttribute("msg","用户或密码错误！");
req.setAttribute("username", username);
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>PDD会员登录页面</title>
<%-- 静态包含 base标签、css样式、jQuery文件 --%>
<%@ include file="/pages/common/head.jsp"%>
</head>
<body>
<div id="login_header">
<img class="logo_img" alt="" src="static/img/login.png" >
</div>
<div class="login_banner">
<div id="l_content">
<span class="login_word">欢迎登录</span>
</div>
<div id="content">
<div class="login_form">
<div class="login_box">
<div class="tit">
<h1>PDD会员</h1>
<a href="regist.jsp">立即注册</a>
</div>
<div class="msg_cont">
<b></b>
<span class="errorMsg">
${ empty requestScope.msg ? "请输入用户名和密码":requestScope.msg }
</span>
</div>
<div class="form">
<form action="loginServlet" method="post">
<label>用户名称：</label>
<input class="itxt" type="text" placeholder="请输入用户名"
autocomplete="off" tabindex="1" name="username"
value="${requestScope.username}" />
<br />
<br />
<label>用户密码：</label>
<input class="itxt" type="password" placeholder="请输入密码" autocomplete="off" tabindex="1" name="password" />
<br />
<br />
<input type="submit" value="登录" id="sub_btn" />
</form>
</div>
</div>
</div>
</div>
</div>
<%--静态包含页脚内容--%>
<%@include file="/pages/common/footer.jsp"%>
</body>
</html>
4.BaseServlet的抽取
在实际的项目开发中，一个模块，一般只使用一个Servlet程序。
- 合并LoginServlet和RegistServlet程序为UserServlet程序
- 抽取BaseServlet程序
BaseServlet程序代码
package github.web;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.Method;
public abstract class BaseServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 解决post请求中文乱码问题
// 一定要在获取请求参数之前调用才有效
req.setCharacterEncoding("UTF-8");
String action = req.getParameter("action");
try {
// 获取action业务鉴别字符串，获取相应的业务 方法反射对象
Method method = this.getClass().getDeclaredMethod(action, HttpServletRequest.class, HttpServletResponse.class);
// System.out.println(method);
// 调用目标业务 方法
method.invoke(this, req, resp);
} catch (Exception e) {
e.printStackTrace();
}
}
}
BeanUtils工具类，它可以一次性的把所有请求的参数注入到JavaBean中。
BeanUtils工具类，经常用于把Map中的值注入到JavaBean中，或者是对象属性值的拷贝操作。
BeanUtils它不是Jdk的类。而是第三方的工具类。所以需要导包。
1、导入需要的jar包：
commons-beanutils-1.8.0.jar
commons-logging-1.1.1.jar
编写WebUtils工具类——WebUtil.java
import org.apache.commons.beanutils.BeanUtils;
import java.util.Map;
public class WebUtils {
// 把Map中的值注入到对应的JavaBean属性中。
public static <T> T copyParamToBean(Map value , T bean ){
try {
System.out.println("注入之前：" + bean);
// 把所有请求的参数都注入到user对象中
BeanUtils.populate(bean, value);
System.out.println("注入之后：" + bean);
} catch (Exception e) {
e.printStackTrace();
}
return bean;
}
}
RegistServlet.java
import github.pojo.User;
import github.service.UserService;
import github.service.impl.UserServiceImpl;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class RegistServlet extends HttpServlet {
private UserService userService = new UserServiceImpl();
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 1、获取请求的参数
String username = req.getParameter("username");
String password = req.getParameter("password");
String email = req.getParameter("email");
String code = req.getParameter("code");
// 2、检查 验证码是否正确 === 写死,要求验证码为:abcde
if ("abcde".equalsIgnoreCase(code)) {
// 3、检查 用户名是否可用
if (userService.existsUsername(username)) {
System.out.println("用户名[" + username + "]已存在!");
// 把回显信息，保存到Request域中
req.setAttribute("msg", "用户名已存在！！");
req.setAttribute("username", username);
req.setAttribute("email", email);
// 跳回注册页面
req.getRequestDispatcher("/pages/user/regist.jsp").forward(req, resp);
} else {
// 可用
// 调用Sservice保存到数据库
userService.registUser(new User(null, username, password, email));
//
// 跳到注册成功页面 regist_success.jsp
req.getRequestDispatcher("/pages/user/regist_success.jsp").forward(req, resp);
}
} else {
// 把回显信息，保存到Request域中
req.setAttribute("msg", "验证码错误！！");
req.setAttribute("username", username);
req.setAttribute("email", email);
System.out.println("验证码[" + code + "]错误");
req.getRequestDispatcher("/pages/user/regist.jsp").forward(req, resp);
}
}
}
UserServlet.java
import github.pojo.User;
import github.service.UserService;
import github.service.impl.UserServiceImpl;
import github.utils.WebUtils;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class UserServlet extends BaseServlet{
private UserService userService = new UserServiceImpl();
/**
* 处理登录的功能
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 1、获取请求的参数
String username = req.getParameter("username");
String password = req.getParameter("password");
// 调用 userService.login()登录处理业务
User loginUser = userService.login(new User(null, username, password, null));
// 如果等于null,说明登录 失败!
if (loginUser == null) {
// 把错误信息，和回显的表单项信息，保存到Request域中
req.setAttribute("msg", "用户或密码错误！");
req.setAttribute("username", username);
// 跳回登录页面
req.getRequestDispatcher("/pages/user/login.jsp").forward(req, resp);
} else {
// 登录 成功
//跳到成功页面login_success.html
req.getRequestDispatcher("/pages/user/login_success.jsp").forward(req, resp);
}
}
/**
* 处理注册的功能
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void regist(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 1、获取请求的参数
String username = req.getParameter("username");
String password = req.getParameter("password");
String email = req.getParameter("email");
String code = req.getParameter("code");
User user = WebUtils.copyParamToBean(req.getParameterMap(), new User());
// 2、检查 验证码是否正确 === 写死,要求验证码为:abcde
if ("abcde".equalsIgnoreCase(code)) {
// 3、检查 用户名是否可用
if (userService.existsUsername(username)) {
System.out.println("用户名[" + username + "]已存在!");
// 把回显信息，保存到Request域中
req.setAttribute("msg", "用户名已存在！！");
req.setAttribute("username", username);
req.setAttribute("email", email);
// 跳回注册页面
req.getRequestDispatcher("/pages/user/regist.jsp").forward(req, resp);
} else {
// 可用
// 调用Sservice保存到数据库
userService.registUser(new User(null, username, password, email));
//
// 跳到注册成功页面 regist_success.jsp
req.getRequestDispatcher("/pages/user/regist_success.jsp").forward(req, resp);
}
} else {
// 把回显信息，保存到Request域中
req.setAttribute("msg", "验证码错误！！");
req.setAttribute("username", username);
req.setAttribute("email", email);
System.out.println("验证码[" + code + "]错误");
req.getRequestDispatcher("/pages/user/regist.jsp").forward(req, resp);
}
}
}
给login.jsp添加隐藏域和修改请求地址:
web.xml配置
<servlet>
<servlet-name>UserServlet</servlet-name>
<servlet-class>github.web.UserServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UserServlet</servlet-name>
<url-pattern>/userServlet</url-pattern>
</servlet-mapping>
5.使用EL表达式修改表单回显
书城项目第四阶段——图书模块
1.MVC概念
MVC全称：Model模型、View视图、Controller控制器。
MVC最早出现在JavaEE三层中的Web层，它可以有效的指导Web层的代码如何有效分离，单独工作。
View视图：只负责数据和界面的显示，不接受任何与显示数据无关的代码，便于程序员和美工的分工合作——JSP/HTML。
Controller控制器：只负责接收请求，调用业务层的代码处理请求，然后派发页面，是一个“调度者”的角色——Servlet。转到某个页面。或者是重定向到某个页面。
Model模型：将与业务逻辑相关的数据封装为具体的JavaBean类，其中不掺杂任何与数据处理相关的代码——JavaBean/domain/entity/pojo。
MVC是一种思想。
MVC的理念是将软件代码拆分成为组件，单独开发，组合使用（目的还是为了降低耦合度）。
MVC的作用还是为了降低耦合。让代码合理分层。方便后期升级和维护。
2.编写图书模块的数据库表
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for t_book
-- ----------------------------
DROP TABLE IF EXISTS `t_book`;
##创建图书表
CREATE TABLE `t_book` (
`id` int(11) NOT NULL AUTO_INCREMENT, ## 主键
`name` varchar(50) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL, ## 书名
`author` varchar(50) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL, ## 作者
`price` decimal(11, 2) NOT NULL, ## 价格
`sales` int(11) NOT NULL, ## 销量
`stock` int(11) NOT NULL, ## 库存
`img_path` varchar(200) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL, ## 书的图片路径
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 21 CHARACTER SET = utf8 COLLATE = utf8_bin ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of t_book
-- ----------------------------
## 插入初始化测试数据
INSERT INTO `t_book` VALUES (1, 'java从入门到放弃', '国哥', 80.00, 9999, 9, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (2, '数据结构与算法', '严敏君', 78.50, 6, 13, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (3, '怎样拐跑别人的媳妇', '龙伍', 68.00, 99999, 52, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (4, '木虚肉盖饭', '小胖', 16.00, 1000, 50, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (5, 'C++编程思想', '刚哥', 45.50, 14, 95, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (6, '蛋炒饭', '周星星', 9.90, 12, 53, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (7, '赌神', '龙伍', 66.50, 125, 535, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (8, 'Java编程思想', '阳哥', 99.50, 47, 36, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (9, 'JavaScript从入门到精通', '婷姐', 9.90, 85, 95, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (10, 'cocos2d-x游戏编程入门', '国哥', 49.00, 52, 62, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (11, 'C语言程序设计', '谭浩强', 28.00, 52, 74, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (12, 'Lua语言程序设计', '雷丰阳', 51.50, 48, 82, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (13, '西游记', '罗贯中', 12.00, 19, 9999, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (14, '水浒传', '华仔', 33.05, 22, 88, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (15, '操作系统原理', '刘优', 133.05, 122, 188, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (16, '数据结构 java版', '封大神', 173.15, 21, 81, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (17, 'UNIX高级环境编程', '乐天', 99.15, 210, 810, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (18, 'javaScript高级编程', '国哥', 69.15, 210, 810, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (19, '大话设计模式', '国哥', 89.15, 20, 10, 'static/img/default.jpg');
INSERT INTO `t_book` VALUES (20, '人月神话', '刚哥', 88.15, 20, 80, 'static/img/default.jpg');
-- ----------------------------
-- Table structure for t_user
-- ----------------------------
DROP TABLE IF EXISTS `t_user`;
CREATE TABLE `t_user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(20) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
`password` varchar(32) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
`email` varchar(200) CHARACTER SET utf8 COLLATE utf8_bin NULL DEFAULT NULL,
PRIMARY KEY (`id`) USING BTREE,
UNIQUE INDEX `username`(`username`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 11 CHARACTER SET = utf8 COLLATE = utf8_bin ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of t_user
-- ----------------------------
INSERT INTO `t_user` VALUES (1, 'admin', 'admin', 'admin@atguigu.com');
INSERT INTO `t_user` VALUES (2, 'subei365', '666666', 'subei@qq.com');
INSERT INTO `t_user` VALUES (3, 'teah4399', '1314912', 'hoist@qq.com');
INSERT INTO `t_user` VALUES (7, 'æ??å??', '123456', 'lisi@qq.com');
INSERT INTO `t_user` VALUES (8, '赵�', '123456', 'zhao@qq.com');
INSERT INTO `t_user` VALUES (9, 'wzg168', '123456', 'wzg168@qq.com');
SET FOREIGN_KEY_CHECKS = 1;
## 查看表内容
select id,name,author,price,sales,stock,img_path from t_book;
3.编写图书模块的JavaBean
package github.pojo;
import java.math.BigDecimal;
public class Book {
private Integer id;
private String name;
private String author;
private BigDecimal price;
private Integer sales;
private Integer stock;
private String imgPath = "static/img/bookhuo.jpg";
public Book() {
super();
}
public Book(Integer id, String name, String author, BigDecimal price, Integer sales, Integer stock, String imgPath) {
this.id = id;
this.name = name;
this.author = author;
this.price = price;
this.sales = sales;
this.stock = stock;
// 要求给定的图书封面图书路径不能为空
if (imgPath != null && !"".equals(imgPath)) {
this.imgPath = imgPath;
}
}
@Override
public int hashCode() {
return super.hashCode();
}
@Override
public boolean equals(Object obj) {
return super.equals(obj);
}
@Override
protected Object clone() throws CloneNotSupportedException {
return super.clone();
}
@Override
protected void finalize() throws Throwable {
super.finalize();
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public BigDecimal getPrice() {
return price;
}
public void setPrice(BigDecimal price) {
this.price = price;
}
public Integer getSales() {
return sales;
}
public void setSales(Integer sales) {
this.sales = sales;
}
public Integer getStock() {
return stock;
}
public void setStock(Integer stock) {
this.stock = stock;
}
public String getImgPath() {
return imgPath;
}
public void setImgPath(String imgPath) {
// 要求给定的图书封面图书路径不能为空
if (imgPath != null && !"".equals(imgPath)) {
this.imgPath = imgPath;
}
}
@Override
public String toString() {
return "Book{" +
"id=" + id +
", name='" + name + '\'' +
", author='" + author + '\'' +
", price=" + price +
", sales=" + sales +
", stock=" + stock +
", imgPath='" + imgPath + '\'' +
'}';
}
}
4.编写图书模块的Dao和测试Dao
Dao接口
package github.dao;
import github.pojo.Book;
import java.util.List;
public interface BookDao {
public int addBook(Book book);
public int deleteBookById(Integer id);
public int updateBook(Book book);
public Book queryBookById(Integer id);
public List<Book> queryBooks();
}
BookDaoImpl实现类
package github.dao.impl;
import github.dao.BookDao;
import github.pojo.Book;
import java.util.List;
public class BookDaoImpl extends BaseDao implements BookDao {
@Override
public int addBook(Book book) {
String sql = "insert into t_book(`name`,`author`,`price`,`sales`,`stock`,`img_path`) values(?,?,?,?,?,?)";
return update(sql, book.getName(),book.getAuthor(),book.getPrice(),book.getSales(),book.getStock(),book.getImgPath());
}
@Override
public int deleteBookById(Integer id) {
String sql = "delete from t_book where id = ?";
return update(sql, id);
}
@Override
public int updateBook(Book book) {
String sql = "update t_book set `name`=?,`author`=?,`price`=?,`sales`=?,`stock`=?,`img_path`=? where id = ?";
return update(sql,book.getName(),book.getAuthor(),book.getPrice(),book.getSales(),book.getStock(),book.getImgPath(),book.getId());
}
@Override
public Book queryBookById(Integer id) {
String sql = "select `id` , `name` , `author` , `price` , `sales` , `stock` , `img_path` imgPath from t_book where id = ?";
return queryForOne(Book.class, sql,id);
}
@Override
public List<Book> queryBooks() {
String sql = "select `id` , `name` , `author` , `price` , `sales` , `stock` , `img_path` imgPath from t_book";
return queryForList(Book.class, sql);
}
}
在idea中创建测试类,方法：鼠标点中类名，使用"Alt+Enter"， 会弹出intention action -> create tests
BookDao的测试
package github.test;
import github.dao.BookDao;
import github.dao.impl.BookDaoImpl;
import github.pojo.Book;
import org.junit.Test;
import java.math.BigDecimal;
public class BookDaoTest {
private BookDao bookDao = new BookDaoImpl();
@Test
public void addBook() {
bookDao.addBook(new Book(null,"代码为什么这么多！", "952761", new BigDecimal(99999),510000,0,null
));
}
@Test
public void deleteBookById() {
bookDao.deleteBookById(21);
}
@Test
public void updateBook() {
bookDao.updateBook(new Book(21,"我该怎么选！", "升学", new BigDecimal(99999),510000,0,null
));
}
@Test
public void queryBookById() {
System.out.println( bookDao.queryBookById(21) );
}
@Test
public void queryBooks() {
for (Book queryBook : bookDao.queryBooks()) {
System.out.println(queryBook);
}
}
}
5.编写图书模块的Service和测试Service
BookService接口
package github.service;
import github.pojo.Book;
import java.util.List;
public interface BookService {
public void addBook(Book book);
public void deleteBookById(Integer id);
public void updateBook(Book book);
public Book queryBookById(Integer id);
public List<Book> queryBooks();
}
BookServiceImpl实现类：
package github.service.impl;
import github.dao.BookDao;
import github.dao.impl.BookDaoImpl;
import github.pojo.Book;
import github.service.BookService;
import java.util.List;
public class BookServiceImpl implements BookService {
private BookDao bookDao = new BookDaoImpl();
@Override
public void addBook(Book book) {
bookDao.addBook(book);
}
@Override
public void deleteBookById(Integer id) {
bookDao.deleteBookById(id);
}
@Override
public void updateBook(Book book) {
bookDao.updateBook(book);
}
@Override
public Book queryBookById(Integer id) {
return bookDao.queryBookById(id);
}
@Override
public List<Book> queryBooks() {
return bookDao.queryBooks();
}
}
BookService的测试：
package github.test;
import github.pojo.Book;
import github.service.BookService;
import github.service.impl.BookServiceImpl;
import org.junit.Test;
import java.math.BigDecimal;
import static org.junit.Assert.*;
public class BookServiceTest {
private BookService bookService = new BookServiceImpl();
@Test
public void addBook() {
bookService.addBook(new Book(null,"系统在手，天下我有！", "2415", new BigDecimal(1000000), 100000000, 0, null));
}
@Test
public void deleteBookById() {
bookService.deleteBookById(22);
}
@Test
public void updateBook() {
bookService.updateBook(new Book(22,"落红不是无情物，化作春泥更护花！", "2415", new BigDecimal(999999), 10, 111110, null));
}
@Test
public void queryBookById() {
System.out.println(bookService.queryBookById(22));
}
@Test
public void queryBooks() {
for (Book queryBook : bookService.queryBooks()) {
System.out.println(queryBook);
}
}
}
6.编写图书模块的Web层，和页面联调测试
1.图书列表功能的实现
BookServlet程序中添加list方法
package github.web;
import github.pojo.Book;
import github.service.BookService;
import github.service.impl.BookServiceImpl;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
public class BookServlet extends BaseServlet{
private BookService bookService = new BookServiceImpl();
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req,resp);
}
protected void list(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1 通过BookService查询全部图书
List<Book> books = bookService.queryBooks();
//2 把全部图书保存到Request域中
req.setAttribute("books", books);
//3、请求转发到/pages/manager/book_manager.jsp页面
req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
}
}
修改【图书管理】请求地址
修改pages/manager/book_manager.jsp页面的数据遍历输出
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图书管理</title>
<%-- 静态包含 base标签、css样式、jQuery文件 --%>
<%@ include file="/pages/common/head.jsp"%>
<script type="text/javascript">
$(function () {
// 给删除的a标签绑定单击事件，用于删除的确认提示操作
$("a.deleteClass").click(function () {
// 在事件的function函数中，有一个this对象。这个this对象，是当前正在响应事件的dom对象。
/**
* confirm是确认提示框函数
* 参数是它的提示内容
* 它有两个按钮，一个确认，一个是取消。
* 返回true表示点击了，确认，返回false表示点击取消。
*/
return confirm("你确定要删除【" + $(this).parent().parent().find("td:first").text() + "】?");
// return false// 阻止元素的默认行为===不提交请求
});
});
</script>
</head>
<body>
<div id="header">
<img class="logo_img" alt="" src="../../static/img/login.png" >
<span class="wel_word">图书管理系统</span>
<%-- 静态包含 manager管理模块的菜单 --%>
<%@include file="/pages/common/manager_menu.jsp"%>
</div>
<div id="main">
<table>
<tr>
<td>名称</td>
<td>价格</td>
<td>作者</td>
<td>销量</td>
<td>库存</td>
<td colspan="2">操作</td>
</tr>
<c:forEach items="${requestScope.books}" var="book">
<tr>
<td>${book.name}</td>
<td>${book.price}</td>
<td>${book.author}</td>
<td>${book.sales}</td>
<td>${book.stock}</td>
<td><a href="manager/bookServlet?action=getBook&id=${book.id}">修改</a></td>
<td><a class="deleteClass" href="manager/bookServlet?action=delete&id=${book.id}">删除</a></td>
</tr>
</c:forEach>
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><a href="book_edit.jsp">添加图书</a></td>
</tr>
</table>
</div>
<%--静态包含页脚内容--%>
<%@include file="/pages/common/footer.jsp"%>
</body>
</html>
web.xml配置
<servlet>
<servlet-name>BookServlet</servlet-name>
<servlet-class>github.web.BookServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BookServlet</servlet-name>
<url-pattern>/manager/bookServlet</url-pattern>
</servlet-mapping>
运行结果如下：
2.前后台的简单介绍
3.添加图书功能的实现
当用户提交完请求，浏览器会记录下最后一次请求的全部信息。当用户按下功能键F5，就会发起浏览器记录的最后一次请求。
BookServlet程序中添加add方法
protected void add(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 1、获取请求的参数==封装成为Book对象
Book book = WebUtils.copyParamToBean(req.getParameterMap(),new Book());
// 2、调用BookService.addBook()保存图书
bookService.addBook(book);
// 3、跳到图书列表页面
// /manager/bookServlet?action=list
// req.getRequestDispatcher("/manager/bookServlet?action=list").forward(req, resp);
resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=list");
}
修改book_edit.jsp页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>编辑图书</title>
<%-- 静态包含 base标签、css样式、jQuery文件 --%>
<%@ include file="/pages/common/head.jsp"%>
<style type="text/css">
h1 {
text-align: center;
margin-top: 200px;
}
h1 a {
color:red;
}
input {
text-align: center;
}
</style>
</head>
<body>
<div id="header">
<img class="logo_img" alt="" src="../../static/img/login.png" >
<span class="wel_word">编辑图书</span>
<%-- 静态包含 manager管理模块的菜单 --%>
<%@include file="/pages/common/manager_menu.jsp"%>
</div>
<div id="main">
<form action="manager/bookServlet" method="get">
<input type="hidden" name="action" value="add" />
<table>
<tr>
<td>名称</td>
<td>价格</td>
<td>作者</td>
<td>销量</td>
<td>库存</td>
<td colspan="2">操作</td>
</tr>
<tr>
<td><input name="name" type="text" value="算法笔记"/></td>
<td><input name="price" type="text" value="59"/></td>
<td><input name="author" type="text" value="胡凡"/></td>
<td><input name="sales" type="text" value="200"/></td>
<td><input name="stock" type="text" value="300"/></td>
<td><input type="submit" value="提交"/></td>
</tr>
</table>
</form>
</div>
<%--静态包含页脚内容--%>
<%@include file="/pages/common/footer.jsp"%>
</body>
</html>
运行结果：
4.删除图书功能的实现
BookServlet程序中的delete方法
protected void delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 1、获取请求的参数id，图书编程
int id = WebUtils.parseInt(req.getParameter("id"), 0);
// 2、调用bookService.deleteBookById();删除图书
bookService.deleteBookById(id);
// 3、重定向回图书列表管理页面
// /book/manager/bookServlet?action=list
resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=list");
}
给WebUtils工具类添加转换 int 类型的工具方法
/**
* 将字符串转换成为int类型的数据
* @param strInt
* @param defaultValue
* @return
*/
public static int parseInt(String strInt,int defaultValue) {
try {
return Integer.parseInt(strInt);
} catch (Exception e) {
e.printStackTrace();
}
return defaultValue;
}
修改删除的连接地址
<td><a class="deleteClass" href="manager/bookServlet?action=delete&id=${book.id}">删除</a></td>
给删除添加确认提示操作
<script type="text/javascript">
$(function () {
// 给删除的a标签绑定单击事件，用于删除的确认提示操作
$("a.deleteClass").click(function () {
// 在事件的function函数中，有一个this对象。这个this对象，是当前正在响应事件的dom对象。
/**
* confirm是确认提示框函数
* 参数是它的提示内容
* 它有两个按钮，一个确认，一个是取消。
* 返回true表示点击了，确认，返回false表示点击取消。
*/
return confirm("你确定要删除【" + $(this).parent().parent().find("td:first").text() + "】?");
// return false// 阻止元素的默认行为===不提交请求
});
});
</script>
运行结果如下：
5.修改图书功能的实现
更新【修改】的请求地址
<td><a href="manager/bookServlet?action=getBook&id=${book.id}">修改</a></td>
BookServlet程序中添加getBook方法
protected void getBook(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1 获取请求的参数图书编号
int id = WebUtils.parseInt(req.getParameter("id"), 0);
//2 调用bookService.queryBookById查询图书
Book book = bookService.queryBookById(id);
//3 保存到图书到Request域中
req.setAttribute("book", book) ;
//4 请求转发到。pages/manager/book_edit.jsp页面
req.getRequestDispatcher("/pages/manager/book_edit.jsp").forward(req,resp);
}
在book_edit.jsp页面中显示修改的数据
<tr>
<td><input name="name" type="text" value="${requestScope.book.name}"/></td>
<td><input name="price" type="text" value="${requestScope.book.price}"/></td>
<td><input name="author" type="text" value="${requestScope.book.author}"/></td>
<td><input name="sales" type="text" value="${requestScope.book.sales}"/></td>
<td><input name="stock" type="text" value="${requestScope.book.stock}"/></td>
<td><input type="submit" value="提交"/></td>
</tr>
运行结果如下：
在BookServlet程序中添加update方法
protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 1、获取请求的参数==封装成为Book对象
Book book = WebUtils.copyParamToBean(req.getParameterMap(),new Book());
// 2、调用BookService.updateBook( book );修改图书
bookService.updateBook(book);
// 3、重定向回图书列表管理页面
// 地址：/工程名/manager/bookServlet?action=list
resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=list");
}
解决book_edit.jsp页面，即要实现添加，又要实现修改操作。
书城项目第五阶段——分页
1.图书分页
分页模块的分析:
1.分页模型Page的抽取
public class Page<T> {
public static final Integer PAGE_SIZE=4;
//当前页码
private Integer pageNo;
//总页码
private Integer pageTotal;
//当前页显示数量
private Integer pageSize=PAGE_SIZE;
//总记录数
private Integer pageTotalCount;
//当前页数据
private List<T> items;
public Integer getPageNo() {
return pageNo;
}
public void setPageNo(Integer pageNo) {
this.pageNo = pageNo;
}
public Integer getPageTotal() {
return pageTotal;
}
public void setPageTotal(Integer pageTotal) {
this.pageTotal = pageTotal;
}
public Integer getPageSize() {
return pageSize;
}
public void setPageSize(Integer pageSize) {
this.pageSize = pageSize;
}
public Integer getPageTotalCount() {
return pageTotalCount;
}
public void setPageTotalCount(Integer pageTotalCount) {
this.pageTotalCount = pageTotalCount;
}
public List<T> getItems() {
return items;
}
public void setItems(List<T> items) {
this.items = items;
}
@Override
public String toString() {
return "Page{" +
"pageNo=" + pageNo +
", pageTotal=" + pageTotal +
", pageSize=" + pageSize +
", pageTotalCount=" + pageTotalCount +
", items=" + items +
'}';
}
}
2.分页的初步实现
BookDao.java代码:
Integer queryForPageTotalCount();
List<Book> queryForPageItems(int begin, int pageSize);
BookDaoImpl.java代码：
@Override
public Integer queryForPageTotalCount() {
String sql = "select count(*) from t_book";
Number count = (Number) queryForSingle(sql);
return count.intValue();
}
@Override
public List<Book> queryForPageItems(int begin, int pageSize) {
String sql = "select `id` , `name` , `author` , `price` , `sales` , `stock` , `img_path` imgPath from t_book limit ?,?";
return queryForList(Book.class,sql,begin,pageSize);
}
BookService.java代码:
Page<Book> page(int pageNo, int pageSize);
BookServiceImpl.java代码:
@Override
public Page<Book> page(int pageNo, int pageSize) {
Page<Book> page = new Page<Book>();
// 设置每页显示的数量
page.setPageSize(pageSize);
// 求总记录数
Integer pageTotalCount = bookDao.queryForPageTotalCount();
// 求总页码
Integer pageTotal = pageTotalCount / pageSize;
if (pageTotalCount % pageSize > 0) {
pageTotal+=1;
}
// 设置总页码
page.setPageTotal(pageTotal);
// 设置当前页码
page.setPageNo(pageNo);
// 求当前页数据的开始索引
int begin = (page.getPageNo() - 1) * pageSize;
// 求当前页数据
List<Book> items = bookDao.queryForPageItems(begin,pageSize);
// 设置当前页数据
page.setItems(items);
return page;
}
BookServlet.java程序的代码:
/**
* 处理分页功能
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1 获取请求的参数 pageNo 和 pageSize
int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 1);
int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
//2 调用BookService.page(pageNo，pageSize)：Page对象
Page<Book> page = bookService.page(pageNo,pageSize);
//3 保存Page对象到Request域中
req.setAttribute("page",page);
//4 请求转发到pages/manager/book_manager.jsp页面
req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
}
manager_menu.jsp中【图书管理】请求地址的修改:
<a href="manager/bookServlet?action=page">图书管理</a>
book_manager.jsp修改：
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图书管理</title>
<%-- 静态包含 base标签、css样式、jQuery文件 --%>
<%@ include file="/pages/common/head.jsp"%>
<script type="text/javascript">
$(function () {
// 给删除的a标签绑定单击事件，用于删除的确认提示操作
$("a.deleteClass").click(function () {
// 在事件的function函数中，有一个this对象。这个this对象，是当前正在响应事件的dom对象。
/**
* confirm是确认提示框函数
* 参数是它的提示内容
* 它有两个按钮，一个确认，一个是取消。
* 返回true表示点击了，确认，返回false表示点击取消。
*/
return confirm("你确定要删除【" + $(this).parent().parent().find("td:first").text() + "】?");
// return false// 阻止元素的默认行为===不提交请求
});
});
</script>
</head>
<body>
<div id="header">
<img class="logo_img" alt="" src="../../static/img/login.png" >
<span class="wel_word">图书管理系统</span>
<%-- 静态包含 manager管理模块的菜单 --%>
<%@include file="/pages/common/manager_menu.jsp"%>
</div>
<div id="main">
<table>
<tr>
<td>名称</td>
<td>价格</td>
<td>作者</td>
<td>销量</td>
<td>库存</td>
<td colspan="2">操作</td>
</tr>
<c:forEach items="${requestScope.page.items}" var="book">
<tr>
<td>${book.name}</td>
<td>${book.price}</td>
<td>${book.author}</td>
<td>${book.sales}</td>
<td>${book.stock}</td>
<td><a href="manager/bookServlet?action=getBook&id=${book.id}">修改</a></td>
<td><a class="deleteClass" href="manager/bookServlet?action=delete&id=${book.id}">删除</a></td>
</tr>
</c:forEach>
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><a href="pages/manager/book_edit.jsp">添加图书</a></td>
</tr>
</table>
<div id="page_nav">
<a href="#">首页</a>
<a href="#">上一页</a>
<a href="#">3</a>
【${requestScope.page.pageNo}】
<a href="#">5</a>
<a href="#">下一页</a>
<a href="#">末页</a>共${requestScope.page.pageTotal}页，${requestScope.page.pageTotalCount}条记录
到第<input value="4" name="pn" id="pn_input"/>页
<input type="button"value="确定">
</div>
</div>
<%--静态包含页脚内容--%>
<%@include file="/pages/common/footer.jsp"%>
</body>
</html>
运行结果如下：
3.首页、上一页、下一页、末页实现
<div id="page_nav"> <%--大于首页，才显示--%> <c:if test="${requestScope.page.pageNo > 1}"> <a href="manager/bookServlet?action=page&pageNo=1">首页</a> <a href="manager/bookServlet?action=page&pageNo=${requestScope.page.pageNo-1}">上一页</a> </c:if> <a href="#">3</a> 【${requestScope.page.pageNo}】 <a href="#">5</a> <%--如果已经是最后一页，则不显示下一页，末页--%> <c:if test="${requestScope.page.pageNo<requestScope.page.pageTotal}"> <a href="manager/bookServlet?action=page&pageNo=${requestScope.page.pageNo+1}">下一页</a> <a href="manager/bookServlet?action=page&pageNo=${requestScope.page.pageTotal}">末页</a> </c:if> 共${requestScope.page.pageTotal}页，${requestScope.page.pageTotalCount}条记录 到第<input value="4" name="pn" id="pn_input"/>页 <input type="button"value="确定"> </div>
运行结果：
4.分页模块中跳转到指定页数功能实现
<div id="page_nav">
<%--大于首页，才显示--%>
<c:if test="${requestScope.page.pageNo > 1}">
<a href="manager/bookServlet?action=page&pageNo=1">首页</a>
<a href="manager/bookServlet?action=page&pageNo=${requestScope.page.pageNo-1}">上一页</a>
</c:if>
<a href="#">3</a>
【${requestScope.page.pageNo}】
<a href="#">5</a>
<%--如果已经是最后一页，则不显示下一页，末页--%>
<c:if test="${requestScope.page.pageNo<requestScope.page.pageTotal}">
<a href="manager/bookServlet?action=page&pageNo=${requestScope.page.pageNo+1}">下一页</a>
<a href="manager/bookServlet?action=page&pageNo=${requestScope.page.pageTotal}">末页</a>
</c:if>
共${requestScope.page.pageTotal}页，${requestScope.page.pageTotalCount}条记录
到第<input value="${param.pageNo}" name="pn" id="pn_input"/>页
<input id="searchPageBtn" type="button" value="确定">
<script type="text/javascript">
$(function () {
// 跳到指定的页码
$("#searchPageBtn").click(function () {
var pageNo = $("#pn_input").val();
<%--var pageTotal=${requestScope.page.pageTotal};--%>
<%--alert(pageTotal);--%>
// javaScript语言中提供了一个location地址栏对象
// 它有一个属性叫href.它可以获取浏览器地址栏中的地址
// href属性可读，可写
location.href = "${pageScope.basePath}manager/bookServlet?action=page&pageNo="+pageNo;
});
});
</script>
</div>
Page对象中的修改:
public void setPageNo(Integer pageNo) {
// 数据边界的有效检查
if (pageNo < 1) {
pageNo = 1;
}
if (pageNo > pageTotal) {
pageNo = pageTotal;
}
this.pageNo = pageNo;
}
BookService中page方法的修改:
@Override
public Page<Book> page(int pageNo, int pageSize) {
Page<Book> page = new Page<Book>();
// 设置每页显示的数量
page.setPageSize(pageSize);
// 求总记录数
Integer pageTotalCount = bookDao.queryForPageTotalCount();
//设置总记录数
page.setPageTotalCount(pageTotalCount);
// 求总页码
Integer pageTotal = pageTotalCount / pageSize;
if (pageTotalCount % pageSize > 0) {
pageTotal+=1;
}
// 设置总页码
page.setPageTotal(pageTotal);
// 设置当前页码
page.setPageNo(pageNo);
// 求当前页数据的开始索引
int begin = (page.getPageNo() - 1) * pageSize;
// 求当前页数据
List<Book> items = bookDao.queryForPageItems(begin,pageSize);
// 设置当前页数据
page.setItems(items);
return page;
}
5.分页模块中，页码1,2,3,4,5的显示，要显示5个页码，并且页码可以点击跳转
需求：显示5个连续的页码，而且当前页码在中间。除了当前页码之外，每个页码都可以点击跳到指定页。
<%--页码输出的开始 --%>
<c:choose>
<%--情况1：如果总页码小于等于5的情况，页码的范围是：1-总页码--%>
<c:when test="${requestScope.page.pageTotal<=5}">
<c:set var="begin"value="1"/>
<c:set var="end"value="${requestScope.page.pageTotal}"/>
</c:when>
<%--情况2：总页码大于5的情况--%>
<c:when test="${requestScope.page.pageTotal>5}">
<c:choose>
<%--小情况1：当前页码为前面3个：1，2，3的情况，页码范围是：1-5.--%>
<c:when test="${requestScope.page.pageNo<=3}">
<c:set var="begin"value="1"/>
<c:set var="end"value="5"/>
</c:when>
<%--小情况2：当前页码为最后3个，8，9，10，页码范围是：总页码减4-总页码--%>
<c:when test="${requestScope.page.pageNo>requestScope.page.pageTotal-3}">
<c:set var="begin"value="${requestScope.page.pageTotal-4}"/>
<c:set var="end"value="${requestScope.page.pageTotal}"/>
</c:when>
<%--小情况3：4，5，6，7，页码范围是：当前页码减2-当前页码加2--%>
<c:otherwise>
<c:set var="begin"value="${requestScope.page.pageNo-2}"/>
<c:set var="end"value="${requestScope.page.pageNo+2}"/>
</c:otherwise>
</c:choose>
</c:when>
</c:choose>
<c:forEach begin="${begin}"end="${end}"var="i">
<c:if test="${i==requestScope.page.pageNo}">
【${i}】
</c:if>
<c:if test="${i!=requestScope.page.pageNo}">
<a href="manager/bookServlet?action=page&pageNo=${i}">${i}</a>
</c:if>
</c:forEach>
<%--页码输出的结束 --%>
6.修改分页后，增加，删除，修改图书信息的回显页面
1.在修改的请求地址上追加当前页码参数:
2.在book_edit.jsp页面中使用隐藏域记录下pageNo参数:
3.在服务器重定向的时候，获取当前页码追加上进行跳转:
package github.web;
import github.pojo.Book;
import github.pojo.Page;
import github.service.BookService;
import github.service.impl.BookServiceImpl;
import github.utils.WebUtils;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
public class BookServlet extends BaseServlet{
private BookService bookService = new BookServiceImpl();
/**
* 处理分页功能
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1 获取请求的参数 pageNo 和 pageSize
int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 1);
int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
//2 调用BookService.page(pageNo，pageSize)：Page对象
Page<Book> page = bookService.page(pageNo,pageSize);
//3 保存Page对象到Request域中
req.setAttribute("page",page);
//4 请求转发到pages/manager/book_manager.jsp页面
req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
}
protected void list(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1 通过BookService查询全部图书
List<Book> books = bookService.queryBooks();
//2 把全部图书保存到Request域中
req.setAttribute("books", books);
//3、请求转发到/pages/manager/book_manager.jsp页面
req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
}
protected void add(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 0);
pageNo+=1;
// 1、获取请求的参数==封装成为Book对象
Book book = WebUtils.copyParamToBean(req.getParameterMap(),new Book());
// 2、调用BookService.addBook()保存图书
bookService.addBook(book);
// 3、跳到图书列表页面
// /manager/bookServlet?action=list
// req.getRequestDispatcher("/manager/bookServlet?action=list").forward(req, resp);
resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=page&pageNo=" + pageNo);
}
protected void delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 1、获取请求的参数id，图书编程
int id = WebUtils.parseInt(req.getParameter("id"), 0);
// 2、调用bookService.deleteBookById();删除图书
bookService.deleteBookById(id);
// 3、重定向回图书列表管理页面
// /book/manager/bookServlet?action=list
resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=page&pageNo=" + req.getParameter("pageNo"));
}
protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 1、获取请求的参数==封装成为Book对象
Book book = WebUtils.copyParamToBean(req.getParameterMap(),new Book());
// 2、调用BookService.updateBook( book );修改图书
bookService.updateBook(book);
// 3、重定向回图书列表管理页面
// 地址：/工程名/manager/bookServlet?action=list
resp.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=page&pageNo=" + req.getParameter("pageNo"));
}
protected void getBook(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1 获取请求的参数图书编号
int id = WebUtils.parseInt(req.getParameter("id"), 0);
//2 调用bookService.queryBookById查询图书
Book book = bookService.queryBookById(id);
//3 保存到图书到Request域中
req.setAttribute("book", book) ;
//4 请求转发到。pages/manager/book_edit.jsp页面
req.getRequestDispatcher("/pages/manager/book_edit.jsp").forward(req,resp);
}
}
2.首页index.jsp的跳转
1.在web下新建ClientBookServlet.java文件:
package github.web;
import github.pojo.Book;
import github.pojo.Page;
import github.service.BookService;
import github.service.impl.BookServiceImpl;
import github.utils.WebUtils;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class ClientBookServlet extends BaseServlet {
private BookService bookService = new BookServiceImpl();
/**
* 处理分页功能
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1 获取请求的参数 pageNo 和 pageSize
int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 1);
int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
//2 调用BookService.page(pageNo，pageSize)：Page对象
Page<Book> page = bookService.page(pageNo,pageSize);
page.setUrl("client/bookServlet?action=page");
//3 保存Page对象到Request域中
req.setAttribute("page",page);
//4 请求转发到pages/manager/book_manager.jsp页面
req.getRequestDispatcher("/pages/client/index.jsp").forward(req,resp);
}
}
2.在page目录下新建client文件夹，在此文件夹下新建index.jsp文件：
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>书城首页</title>
<%-- 静态包含 base标签、css样式、jQuery文件 --%>
<%@ include file="/pages/common/head.jsp"%>
</head>
<body>
<div id="header">
<img class="logo_img" alt="" src="static/img/logo.gif" >
<span class="wel_word">网上书城</span>
<div>
<a href="pages/user/login.jsp">登录</a> |
<a href="pages/user/regist.jsp">注册</a>
<a href="pages/cart/cart.jsp">购物车</a>
<a href="pages/manager/manager.jsp">后台管理</a>
</div>
</div>
<div id="main">
<div id="book">
<div class="book_cond">
<form action="client/bookServlet" method="get">
<input type="hidden" name="action" value="pageByPrice">
价格：<input id="min" type="text" name="min" value=""> 元 -
<input id="max" type="text" name="max" value=""> 元
<input type="submit" value="查询" />
</form>
</div>
<div style="text-align: center">
<span>您的购物车中有3件商品</span>
<div>
您刚刚将<span style="color: red">时间简史</span>加入到了购物车中
</div>
</div>
<c:forEach items="${requestScope.page.items}" var="book">
<div class="b_list">
<div class="img_div">
<img class="book_img" alt="" src="${book.imgPath}" />
</div>
<div class="book_info">
<div class="book_name">
<span class="sp1">书名:</span>
<span class="sp2">${book.name}</span>
</div>
<div class="book_author">
<span class="sp1">作者:</span>
<span class="sp2">${book.author}</span>
</div>
<div class="book_price">
<span class="sp1">价格:</span>
<span class="sp2">￥${book.price}</span>
</div>
<div class="book_sales">
<span class="sp1">销量:</span>
<span class="sp2">${book.sales}</span>
</div>
<div class="book_amount">
<span class="sp1">库存:</span>
<span class="sp2">${book.stock}</span>
</div>
<div class="book_add">
<button>加入购物车</button>
</div>
</div>
</div>
</c:forEach>
</div>
<%--静态包含分页条--%>
<%@include file="/pages/common/page_nav.jsp"%>
</div>
<%--静态包含页脚内容--%>
<%@include file="/pages/common/footer.jsp"%>
</body>
</html>
3.WEB-INF文件夹下的web.xml文件配置:
<servlet>
<servlet-name>ClientBookServlet</servlet-name>
<servlet-class>github.web.ClientBookServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ClientBookServlet</servlet-name>
<url-pattern>/client/bookServlet</url-pattern>
</servlet-mapping>
4.将web文件夹下的index.jsp文件修改：
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%--只负责请求转发--%>
<jsp:forward page="/client/bookServlet?action=page"></jsp:forward>
3.分页条的抽取
抽取分页条中请求地址为url变量
1.在page对象中添加url属性,并重新生成get、set方法与tostring:
2.在Servlet程序的page分页方法中设置url的分页请求地址:
- 后台的！
protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1 获取请求的参数 pageNo 和 pageSize
int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 1);
int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
//2 调用BookService.page(pageNo，pageSize)：Page对象
Page<Book> page = bookService.page(pageNo,pageSize);
page.setUrl("manager/bookServlet?action=page");
//3 保存Page对象到Request域中
req.setAttribute("page",page);
//4 请求转发到pages/manager/book_manager.jsp页面
req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
}
- 前台的！
protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1 获取请求的参数 pageNo 和 pageSize
int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 1);
int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
//2 调用BookService.page(pageNo，pageSize)：Page对象
Page<Book> page = bookService.page(pageNo,pageSize);
page.setUrl("client/bookServlet?action=page");
//3 保存Page对象到Request域中
req.setAttribute("page",page);
//4 请求转发到pages/manager/book_manager.jsp页面
req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
}
3.修改分页条中请求地址为url变量输出,并抽取一个单独的jsp页面
<div id="page_nav">
<%--大于首页，才显示--%>
<c:if test="${requestScope.page.pageNo > 1}">
<a href="${requestScope.page.url}&pageNo=1">首页</a>
<a href="${requestScope.page.url}&pageNo=${requestScope.page.pageNo-1}">上一页</a>
</c:if>
<%--页码输出的开始 --%>
<c:choose>
<%--情况1：如果总页码小于等于5的情况，页码的范围是：1-总页码--%>
<c:when test="${requestScope.page.pageTotal<=5}">
<c:set var="begin" value="1"/>
<c:set var="end" value="${requestScope.page.pageTotal}"/>
</c:when>
<%--情况2：总页码大于5的情况--%>
<c:when test="${requestScope.page.pageTotal>5}">
<c:choose>
<%--分情况1：当前页码为前面3个：1，2，3的情况，页码范围是：1-5.--%>
<c:when test="${requestScope.page.pageNo<=3}">
<c:set var="begin" value="1"/>
<c:set var="end" value="5"/>
</c:when>
<%--分情况2：当前页码为最后3个，8，9，10，页码范围是：总页码减4-总页码--%>
<c:when test="${requestScope.page.pageNo>requestScope.page.pageTotal-3}">
<c:set var="begin" value="${requestScope.page.pageTotal-4}"/>
<c:set var="end" value="${requestScope.page.pageTotal}"/>
</c:when>
<%--分情况3：4，5，6，7，页码范围是：当前页码减2-当前页码加2--%>
<c:otherwise>
<c:set var="begin" value="${requestScope.page.pageNo-2}"/>
<c:set var="end" value="${requestScope.page.pageNo+2}"/>
</c:otherwise>
</c:choose>
</c:when>
</c:choose>
<c:forEach begin="${begin}" end="${end}" var="i">
<c:if test="${i==requestScope.page.pageNo}">
【${i}】
</c:if>
<c:if test="${i!=requestScope.page.pageNo}">
<a href="${requestScope.page.url}&pageNo=${i}">${i}</a>
</c:if>
</c:forEach>
<%--页码输出的结束 --%>
<%--如果已经是最后一页，则不显示下一页，末页--%>
<c:if test="${requestScope.page.pageNo<requestScope.page.pageTotal}">
<a href="${requestScope.page.url}&pageNo=${requestScope.page.pageNo+1}">下一页</a>
<a href="${requestScope.page.url}&pageNo=${requestScope.page.pageTotal}">末页</a>
</c:if>
共${requestScope.page.pageTotal}页，${requestScope.page.pageTotalCount}条记录
到第<input value="${param.pageNo}" name="pn" id="pn_input"/>页
<input id="searchPageBtn" type="button" value="确定">
<script type="text/javascript">
$(function () {
// 跳到指定的页码
$("#searchPageBtn").click(function () {
var pageNo = $("#pn_input").val();
<%--var pageTotal=${requestScope.page.pageTotal};--%>
<%--alert(pageTotal);--%>
// javaScript语言中提供了一个location地址栏对象
// 它有一个属性叫href.它可以获取浏览器地址栏中的地址
// href属性可读，可写
location.href = "${pageScope.basePath}${requestScope.page.url}&pageNo="+pageNo;
});
});
</script>
</div>
这里太长了，看不懂的话请参考源码，具体步骤就是这样。主要分前后台同时修改！
4.首页价格搜索
1.修改client文件夹下的index.jsp文件：
2.在BookService.java文件下，新建如下方法:
3.ClientBookServlet.java文件添加如下代码：
protected void pageByPrice(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1 获取请求的参数 pageNo 和 pageSize
int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 1);
int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
int min = WebUtils.parseInt(req.getParameter("min"), 0);
int max = WebUtils.parseInt(req.getParameter("max"), Integer.MAX_VALUE);
//2 调用BookService.page(pageNo，pageSize)：Page对象
Page<Book> page = bookService.pageByPrice(pageNo,pageSize,min,max);
StringBuilder sb = new StringBuilder("client/bookServlet?action=pageByPrice");
// 如果有最小价格的参数,追加到分页条的地址参数中
if (req.getParameter("min") != null) {
sb.append("&min=").append(req.getParameter("min"));
}
// 如果有最大价格的参数,追加到分页条的地址参数中
if (req.getParameter("max") != null) {
sb.append("&max=").append(req.getParameter("max"));
}
page.setUrl(sb.toString());
//3 保存Page对象到Request域中
req.setAttribute("page",page);
//4 请求转发到pages/manager/book_manager.jsp页面
req.getRequestDispatcher("/pages/client/index.jsp").forward(req,resp);
}
4.继续修改BookServiceImpl.java：
@Override
public Page<Book> pageByPrice(int pageNo, int pageSize, int min, int max) {
Page<Book> page = new Page<Book>();
// 设置每页显示的数量
page.setPageSize(pageSize);
// 求总记录数
Integer pageTotalCount = bookDao.queryForPageTotalCountByPrice(min,max);
// 设置总记录数
page.setPageTotalCount(pageTotalCount);
// 求总页码
Integer pageTotal = pageTotalCount / pageSize;
if (pageTotalCount % pageSize > 0) {
pageTotal+=1;
}
// 设置总页码
page.setPageTotal(pageTotal);
// 设置当前页码
page.setPageNo(pageNo);
// 求当前页数据的开始索引
int begin = (page.getPageNo() - 1) * pageSize;
// 求当前页数据
List<Book> items = bookDao.queryForPageItemsByPrice(begin,pageSize,min,max);
// 设置当前页数据
page.setItems(items);
return page;
}
5.在BookDao.java添加如下代码:
6.在BookDaoImpl.java文件下添加如下：
package github.dao.impl;
import github.dao.BookDao;
import github.pojo.Book;
import java.util.List;
public class BookDaoImpl extends BaseDao implements BookDao {
@Override
public int addBook(Book book) {
String sql = "insert into t_book(`name`,`author`,`price`,`sales`,`stock`,`img_path`) values(?,?,?,?,?,?)";
return update(sql, book.getName(),book.getAuthor(),book.getPrice(),book.getSales(),book.getStock(),book.getImgPath());
}
@Override
public int deleteBookById(Integer id) {
String sql = "delete from t_book where id = ?";
return update(sql, id);
}
@Override
public int updateBook(Book book) {
String sql = "update t_book set `name`=?,`author`=?,`price`=?,`sales`=?,`stock`=?,`img_path`=? where id = ?";
return update(sql,book.getName(),book.getAuthor(),book.getPrice(),book.getSales(),book.getStock(),book.getImgPath(),book.getId());
}
@Override
public Book queryBookById(Integer id) {
String sql = "select `id` , `name` , `author` , `price` , `sales` , `stock` , `img_path` imgPath from t_book where id = ?";
return queryForOne(Book.class, sql,id);
}
@Override
public List<Book> queryBooks() {
String sql = "select `id` , `name` , `author` , `price` , `sales` , `stock` , `img_path` imgPath from t_book";
return queryForList(Book.class, sql);
}
@Override
public Integer queryForPageTotalCount() {
String sql = "select count(*) from t_book";
Number count = (Number) queryForSingle(sql);
return count.intValue();
}
@Override
public List<Book> queryForPageItems(int begin, int pageSize) {
String sql = "select `id` , `name` , `author` , `price` , `sales` , `stock` , `img_path` imgPath from t_book limit ?,?";
return queryForList(Book.class,sql,begin,pageSize);
}
@Override
public Integer queryForPageTotalCountByPrice(int min, int max) {
String sql = "select count(*) from t_book where price between ? and ?";
Number count = (Number) queryForSingle(sql,min,max);
return count.intValue();
}
@Override
public List<Book> queryForPageItemsByPrice(int begin, int pageSize, int min, int max) {
String sql = "select `id`,`name`,`author`,`price`,`sales`,`stock`,`img_path` imgPath " +
"from t_book where price between ? and ? order by price limit ?,?";
return queryForList(Book.class,sql,min,max,begin,pageSize);
}
}
7.局部具体测试：
5.价格区间搜索并分页功能的实现
欢迎查阅
