SSM整合–详细步骤。–ssmbuild

SpringMVC：整合SSM

环境:
·IDEA

• MySQL
• Tomcat9
• Maven

要求:
需要熟练掌握MySQL数据库，Spring,JavaWeb及MyBatis知识，简单的前端知识;

开始：

一、：数据库环境

包结构：

Web

1：创建一个存放书籍数据的数据库表

CREATE DATABASE `ssmbuild`;

USE `ssmbuild`;

DROP TABLE IF EXISTS `books`;

CREATE TABLE `books`(
		`bookID` INT(10) NOT NULL PRIMARY KEY auto_increment COMMENT '书ID',
		`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
		`bookCounts` INT(11) NOT NULL COMMENT '数量',
		`detail` VARCHAR(200) NOT NULL COMMENT '描述'
) ENGINE=INNODB DEFAULT CHARSET=utf8

INSERT INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES
(1,'java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢')

2：IDEA连接数据库；保证可以打开表

3：导入依赖 ： 解决静态资源导出的问题（注意：导出问题）

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.baidu</groupId>
    <artifactId>ssmBuild</artifactId>
    <version>1.0-SNAPSHOT</version>


    <dependencies>
        <!--Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!--数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!-- 数据库连接池 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

        <!--Servlet - JSP -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!--Mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

        <!--Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.22</version>
        </dependency>


    </dependencies>

    <!--3、Maven资源过滤设置-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

</project>

4：创建包结构（基本的表结构在开头就有写）

5：配置resource资源的文件（mybatis ,spring,jdbc等）

Mybatis配置文件(mybatis-config.xml)

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>


</configuration>

Spring配置文件(applicationContext.xml)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns= "http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">


</beans>

二、MyBatis层

1：MyBatis层编写；
在resource下创建database.properties;

(这里要注意的是mySQL是8+以上的版本，要添加时间设置 &serverTimezone=Asia/Shanghai)

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=false&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=root

2：IDEA关联数据库：

3：编写MyBatis的核心配置文件

在resource下创建mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <!--日志-->
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
    
    <!--别名-->
    <typeAliases>
        <package name="com.baidu.pojo"/>
    </typeAliases>

	<!--绑定接口-->
    <mappers>
        <mapper class="com.baidu.dao.BookMapper"/>
    </mappers>

</configuration>

4：编写数据库对应的实体类，com.baidu.pojo.Books;

使用Lombok插件；

package com.baidu.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {

    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;

}

5：编写dao层的Mapper接口，

package com.baidu.dao;

import com.baidu.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface BookMapper {

    //增加一个Book
    int addBook(Books book);

    //根据id删除一个Book
    int deleteBookById(int id);

    //更新Book
    int updateBook(Books books);

    //根据id查询,返回一个Book
    Books queryBookById(int id);

    //查询全部Book,返回list集合
    List<Books> queryAllBook();

   //查询功能，查询书籍
    List<Books> queryBookByName(@Param("bookName") String bookName);


}

6：编写对应的Mapper.xml文件，需要绑定MyBatis的接口，

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.baidu.dao.BookMapper">

    <!--增加一个Book-->
    <insert id="addBook" parameterType="Books">
      insert into ssmbuild.books(bookName,bookCounts,detail)
      values (#{bookName}, #{bookCounts}, #{detail})
   </insert>

    <!--根据id删除一个Book-->
    <delete id="deleteBookById" parameterType="int">
      delete from ssmbuild.books where bookID=#{bookID}
   </delete>

    <!--更新Book-->
    <update id="updateBook" parameterType="Books">
      update ssmbuild.books
      set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}
      where bookID = #{bookID}
   </update>

    <!--根据id查询,返回一个Book-->
    <select id="queryBookById" resultType="Books">
      select * from ssmbuild.books
      where bookID = #{bookID}
   </select>

    <!--查询全部Book-->
    <select id="queryAllBook" resultType="Books">
      SELECT * from ssmbuild.books
   </select>

    <!--查询功能，查询书籍-->
    <select id="queryBookByName" resultType="Books">
        select * from ssmbuild.books where bookName like #{bookName}
    </select>

</mapper>

7:编写Service层；接口：

package com.baidu.service;

import com.baidu.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

//BookService:底下需要去实现,调用dao层
public interface BookService {
    //增加一个Book
    int addBook(Books book);
    //根据id删除一个Book
    int deleteBookById(int id);
    //更新Book
    int updateBook(Books books);
    //根据id查询,返回一个Book
    Books queryBookById(int id);
    //查询全部Book,返回list集合
    List<Books> queryAllBook();

   //查询功能，查询书籍
    List<Books> queryBookByName(String booksName);
}

Service层的实现类；

package com.baidu.service;


import com.baidu.dao.BookMapper;
import com.baidu.pojo.Books;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class BookServiceImpl implements BookService {

    //调用dao层的操作，设置一个set接口，方便Spring管理
    private BookMapper bookMapper;

    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }

    public int addBook(Books book) {
        return bookMapper.addBook(book);
    }

    public int deleteBookById(int id) {
        return bookMapper.deleteBookById(id);
    }

    public int updateBook(Books books) {
        return bookMapper.updateBook(books);
    }

    public Books queryBookById(int id) {
        return bookMapper.queryBookById(id);
    }

    public List<Books> queryAllBook() {
        return bookMapper.queryAllBook();
    }

  
    @Override
    public List<Books> queryBookByName(String booksName) {
        return bookMapper.queryBookByName(booksName);
    }
}

三、Spring层

1：配置Spring整合Mybatis，这里我们数据源的使用：c3p0连接池

2：我们去编写Spring整合MyBatis的相关配置文件，（spring-dao.xml）

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 配置整合mybatis -->
    <!-- 1.关联数据库文件 -->
    <!-- 原来Spring整合MyBatis 使用的是Spring 的 DriverManagerDataSource整合的 -->
    <context:property-placeholder location="classpath:database.properties"/>

    <!-- 2.数据库连接池 -->
    <!--数据库连接池
        dbcp 半自动化操作 不能自动连接
        c3p0 自动化操作（自动的加载配置文件 并且设置到对象里面）
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 配置连接池属性 -->
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!-- 3.配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
    <!--解释 ：https://www.cnblogs.com/jpfss/p/7799806.html-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 给出需要扫描Dao接口包 -->
        <property name="basePackage" value="com.baidu.dao"/>
    </bean>

</beans>

3：Spring整合Service层（spring-service.xml）

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 扫描service相关的bean -->
    <context:component-scan base-package="com.baidu.service" />

    <!--BookServiceImpl注入到IOC容器中-->
    <bean id="BookServiceImpl" class="com.baidu.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>

    <!-- 配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource" />
    </bean>

</beans>

四、SpringMVC层

1：Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <!--DispatcherServlet-->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了！-->
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--编码处理过滤器-->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--Session过期时间-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>

</web-app>

2：spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context.xsd
   http://www.springframework.org/schema/mvc
   https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!-- 配置SpringMVC -->
    <!-- 1.开启SpringMVC注解驱动 -->
    <mvc:annotation-driven />
    <!-- 2.静态资源默认servlet配置-->
    <mvc:default-servlet-handler/>

    <!-- 3.配置jsp 显示ViewResolver视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- 4.扫描web相关的bean -->
    <context:component-scan base-package="com.baidu.controller" />

</beans>

3：Spring配置整合文件，applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">

    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml"/>

</beans>

配置文件，暂时结束！Controller 和 视图层编写

五、编写一些Controller,实现页面的跳转

1：BookController类编写，方法一：查询全部的书籍；

@Controller
@RequestMapping("/book")
public class BookController {

    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    @RequestMapping("/allBook")
    public String list(Model model) {
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("list", list);
        return "allBook";
    }

2：编写Index.jsp首页 页面；

编写前端的首页 页面，提交前端的表单。（进入书籍页面，进入书籍展示页面）

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>首页</title>


    <style>
      a{
        text-decoration: none;
        color: #000;
        font-size: 18px;

      }

      h3{
        width: 180px;
        height: 38px;
        margin: 100px auto;
        text-align: center;
        line-height: 38px;
        background: lightskyblue;
        border-radius: 5px;

      }
    </style>

  </head>
  <body>

  <h3>
    <a href="${pageContext.request.contextPath}/book/allBook">进入书籍页面</a>
  </h3>

  </body>
</html>

3：书籍列表页面展示

点击进入数据页面，展示书籍列表页面。（显示所有的数据，forEarch循环数据库中拿取）

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示</title>

    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"
          integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">

</head>
<body>


<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>书籍展示 ---------- 显示所有的书籍</small>
                </h1>
            </div>
            <div class="row">
                <div class="col-md-4 column">
                    <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddPaper">新增书籍</a>
                    <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部书籍</a>
                </div>
                <div class="col-md-4 column"></div>

                <div class="col-md-4 column">
                    <form class="form-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post">
                        <span style="color: red;font-weight: bold;width: 20px">${error}</span>
                        <div>
                            <input type="text" name="queryBookByName" class="form-control" placeholder="请输入要查询的书籍名称：">
                            <input type="submit" value="查询">
                        </div>
                    </form>
                </div>

            </div>
        </div>

    </div>


    <div class="row clearfix">
        <div class="col-md-12 column">
            <table class="table table-bordered table-hover">
                <thead>
                    <tr>
                        <th>书籍编号</th>
                        <th>书籍名称</th>
                        <th>书籍数量</th>
                        <th>书籍详情</th>
                        <th>操作：</th>
                    </tr>
                </thead>

                <tbody>

                <%--书籍从数据库中查出来，从这个List遍历出来 ： forEach--%>
                <%--var:代表当前条目的变量名称。items: 要被循环的信息--%>
                <c:forEach var="book" items="${requestScope.get('list')}">

                    <tr>
                        <td>${book.bookID}</td>
                        <td>${book.bookName}</td>
                        <td>${book.bookCounts}</td>
                        <td>${book.detail}</td>
                        <td>
                            <a href="${pageContext.request.contextPath}/book/toUpdate?id=${book.bookID}">修改</a>
                            &nbsp; | &nbsp;
                            <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
                        </td>
                    </tr>

                </c:forEach>
                </tbody>
            </table>
        </div>
    </div>

</div>


</body>
</html>

4：BookController 类编写 ， 方法二：添加书籍操作

这里的业务逻辑是点击添加书籍的按钮，跳转到添加书籍的页面，
添加书籍信息完毕后，点击添加，书籍添加到/addBook页面；

//跳转到增加书籍页面
@RequestMapping("/toAddPaper")
public String toAddPaper(){
    return "addBook";
}

//添加书籍的请求：
@RequestMapping("/addBook")
public String addBook(Books books){
    System.out.println("addBook===>"+books);
    bookService.addBook(books);
    return "redirect:/book/allBook";//重定向到@RequestMapping("/allBook")请求：请求复用

}

5：添加书籍页面：addBook.jsp

在书籍展示页面，添加添加书籍的按钮和显示所有书籍的按钮

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示</title>

    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">

    <!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script>


</head>
<body>



<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>书籍展示   ----------   显示所有的书籍</small>
                </h1>
            </div>
            <div class="row">
                <div class="col-md-4 column">
                    <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddPaper">新增书籍</a>
                    <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部书籍</a>
                </div>
                <div class="col-md-4 column"></div>
                <div class="col-md-4 column">
                    <form class="form-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post">
                        <span style="color: red;font-weight: bold;width: 20px;">${error}</span>
                        <input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询的书籍名称：">
                        <input type="submit"value="查询">

                    </form>
                </div>

            </div>
        </div>


    </div>


    <div class="row clearfix">
        <div class="col-md-12 column">
            <table class="table table-bordered table-hover">
                <thead>
                    <tr>
                        <th>书籍编号</th>
                        <th>书籍名称</th>
                        <th>书籍数量</th>
                        <th>书籍详情</th>
                        <th>操作：</th>
                    </tr>
                </thead>

                <tbody>
                    <c:forEach var="book" items="${requestScope.get('list')}">
                        <tr>
                            <td>${book.bookID}</td>
                            <td>${book.bookName}</td>
                            <td>${book.bookCounts}</td>
                            <td>${book.detail}</td>
                            <td>
                                <a href="${pageContext.request.contextPath}/book/toUpdate?id=${book.bookID}">修改</a>
                                &nbsp; | &nbsp;
                                <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
                            </td>
                        </tr>

                    </c:forEach>
                </tbody>
            </table>
        </div>
    </div>

</div>


</body>
</html>

6: BookController 类编写 ， 方法三：修改书籍

点击修改获取到该修改数据的ID，通过ID修改数据操作。
1、当用户点击修改按钮，页面跳转到修改页面。
2、修改页面点击修改，获取当前的修改数据并提交。返回全部数据页面。

    //跳转到修改页面
    @RequestMapping("/toUpdate")
    public String toUpdatePaper(int id, Model model) {
        Books books = bookService.queryBookById(id);
        model.addAttribute("QBook", books);
        return "updateBook";
    }
    
	//修改书籍
    @RequestMapping("/updateBook")
    public String updateBook(Books books) {
        System.out.println("updateBook==>" + books);
        int i = bookService.updateBook(books);
        if (i > 0) {
            System.out.println("添加books成功" + books);
        }
        return "redirect:/book/allBook";


    }

7、修改书籍页面 updateBook.jsp

通过隐藏域，查询到数据ID，从而进行修改。

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍</title>

    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">

    <!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script>

</head>
<body>


<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                </h1>
                    <small>修改书籍</small>
            </div>
        </div>
    </div>

    <form action="${pageContext.request.contextPath}/book/updateBook" method="post">

        <%--查找书籍出现的问题：
        1：我们提交修改SQL的请求，但是修改失败，初次考虑，是事物的问题，配置完毕后，已久失败，
        2：看一下SQL是否执行成功，SQL执行失败，修改未完成。
        3：重点：前端传递隐藏域（用来取到书的ID）
        --%>

        <input type="hidden" name="bookID" value="${QBook.bookID}">
        
        <div class="form-group">
            <label>书籍名称：</label>
            <input type="text" name="bookName" value="${QBook.bookName}"  class="form-control" required>
        </div>
        <div class="form-group">
            <label>书籍数量：</label>
            <input type="text" name="bookCounts" value="${QBook.bookCounts}"  class="form-control" required>
        </div>
        <div class="form-group">
            <label>书籍表述：</label>
            <input type="text" name="detail" value="${QBook.detail}"  class="form-control" required>
        </div>
        <div class="form-group">
            <input type="submit" class="form-control" value="修改">
        </div>

    </form>

</div>


</body>
</html>

8、BookController 类编写 ， 方法四：删除书籍

这里只有一个业务逻辑，点击删除，通过ID删除数据。

//删除书籍
@RequestMapping("/deleteBook/{bookId}")
public String deleteBook(@PathVariable("bookId") int id){
    bookService.deleteBookById(id);
    return "redirect:/book/allBook";
}

9：查询书籍页面

查询数据：通过模糊查询，查询到数据，返回allBook页面，实现页面的复用。

//查询书籍
    @RequestMapping("/queryBook")
    public String queryBook(String queryBookByName, Model model) {

        List<Books> books = bookService.queryBookByName("%" + queryBookByName + "%");

        System.out.println("books=>" + books);

        model.addAttribute("list", books);

        return "allBook";

    }