SpringMVC对于SSM(Spring,SpringMVC,Mybatis)的整合，源于：遇见狂神说

环境：

Mybatis3官方文档
IDEA
MySQL 5.7
Tomcat 9
Maven 3.6
数据库创建代码

`CREATE DATABASE `ssmbuild`;

USE `ssmbuild`;
DROP TABLE IF EXISTS `books`;

CREATE TABLE `books` (
`bookID` INT(10) NOT NULL 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',
KEY `bookID` (`bookID`)
) ENGINE=INNODB DEFAULT CHARSET=utf8

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

基本环境搭建
1.新建一Maven项目！项目名称：ssmbuild ， 添加web的支持
2.导入相关的pom依赖！

<?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.strong</groupId>
    <artifactId>ssmbuild</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--依赖：junit,数据库驱动，连接池，servlet,jsp,mybatis,mybatis-spring,spring-->
    <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  c3p0-->
        <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>
        <!--Lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
        </dependency>
    </dependencies>

     <!--静态资源导出问题-->
    <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>

3.建立基本项目结构
com.strong.pojo

com.strong.dao

com.strong.service

com.strong.controller

mybatis-config.xml

项目整体结构

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.关联数据库配置文件 -->
    <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）
        druid
        hikari
    -->
    <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="initialPoolSize" 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.strong.dao"/>
    </bean>

</beans>

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


    <!-- 4.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/html/" />
        <property name="suffix" value=".jsp" />
    </bean>

</beans>

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">

    <!--1. 扫描service相关的bean -->
    <context:component-scan base-package="com.strong.service" />

    <!--2. BookServiceImpl注入到IOC容器中-->
    <bean id="BookServiceImpl" class="com.strong.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>

    <!--3. 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>
    <!-- 4.AOP事务支持 -->

</beans>

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

</beans>

database.properties

jdbc.driver=com.mysql.jdbc.Driver
# 若使用的是MySQL8.0+，需要增加时区的配置
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=false&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=

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>
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
    <typeAliases>
        <package name="com.strong.pojo"/>
    </typeAliases>
    <mappers>
        <mapper resource="com/strong/dao/BookMapper.xml"/>
    </mappers>
</configuration>

注意！！！连接数据库时如果忘记密码，会有：

在URL上写上：jdbc:mysql://localhost:3306?serverTimezone=GMT%2B8即可

连接到数据库之后是这样

pojo下的实体类
Java类Books

package com.strong.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;
}

dao目录下
BookMapper（或者BookDao）接口

package com.strong.dao;

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

import java.util.List;

public interface BookMapper {
    
    

    //增加一本书
    int addBook(Books books);

    //删除一本书
    int deleteBookById(@Param("bookID") int id);

    //更新一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBookById(@Param("bookID") int id);

    //查询全部的书
    List<Books> queryAllBook();

    //根据书名查询书籍
    Books queryBookByName(@Param("bookName") String bookName);
}

bookMapper.xml

<?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.strong.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>

    <!-- 根据书名查询书籍-->
    <select id="queryBookByName" parameterType="String" resultType="Books">
        select * from ssmbuild.books where bookName=#{bookName}
    </select>


</mapper>

service下
BookService接口

package com.strong.service;

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

import java.util.List;

public interface BookService {
    
    
    //增加一本书
    int addBook(Books books);

    //删除一本书
    int deleteBookById( int id);

    //更新一本书
    int updateBook(Books books);

    //查询一本书
    Books queryBookById( int id);

    //查询全部的书
    List<Books> queryAllBook();

    //根据书名查询书籍
    Books queryBookByName(@Param("bookName") String bookName);
}

bookServiceImpl实现类

package com.strong.service;

import com.strong.dao.BookMapper;
import com.strong.pojo.Books;


import java.util.List;


public class BookServiceImpl implements BookService{
    
    
    //业务层（service）调用dao层，此处组合dao层

    private BookMapper bookMapper;

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

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

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

    public int updateBook(Books books) {
    
    
        System.out.println("BookServiceImpl:updateBook=>"+books);
        return bookMapper.updateBook(books);
    }

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

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

    @Override
    public Books queryBookByName(String bookName) {
    
    
        return bookMapper.queryBookByName(bookName);
    }
}

html(jsp下)

addBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: QUANTUM
  Date: 2021/9/9
  Time: 15:50
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示页面</title>
    <%--BootStrap美化页面--%>
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>

<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>新增书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/book/addBook" method="post">
        <label>书籍名称：</label>
        <input type="text" class="form-control" name="bookName" required><br><br><br>
        <label>书籍数量：</label>
        <input type="text" class="form-control" name="bookCounts" required><br><br><br>
        <label>书籍详情：</label>
        <input type="text" class="form-control" name="detail" required><br><br><br>
        <input type="submit"   value="添加">
    </form>
</div>

</body>
</html>

allBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: QUANTUM
  Date: 2021/9/8
  Time: 17:50
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示页面</title>
    <%--BootStrap美化页面--%>
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>

<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>书籍列表——显示所有书籍</small>
                </h1>
            </div>
        </div>

        <div class="row">
            <div class="col-md-4 column">
                <%-- toAddBook--%>
                <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
                <a class="btn btn-primary" href="${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">
                <%-- 根据书名查询书籍--%>
                <form action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right" class="form-inline">
                    <span style="color: red;font-weight: bold">${
    
    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" class="btn btn-primary">
                </form>
            </div>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12 column">
            <table class="table table-hover table-striped">
                <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>
                <%-- 书籍从数据库中查询出来，从这个list中遍历出来：foreach --%>
                <tbody>
                   <c:forEach var="book" items="${list}">
                       <tr>
                           <td>${
    
    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>

updateBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: QUANTUM
  Date: 2021/9/9
  Time: 15:50
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍页面</title>
    <%--BootStrap美化页面--%>
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>

<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>修改书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
        <%--出现的问题：我们提交了修改sql的请求，但是修改失败，初次考虑事务问题，配置完毕事务，依旧失败！--%>
        <%--查看一下有bookID=0的情况，显然是SQL执行失败，修改未完成--%>
            <%--前端传递隐藏域名--%>
            <input type="hidden" name="bookID" value="${QBook.bookID}">


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

</body>
</html>

index.jsp(!!,此页面与html页面同级)

<%--
  Created by IntelliJ IDEA.
  User: QUANTUM
  Date: 2021/9/8
  Time: 10:23
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>首页</title>
    <style>
      a{
    
    
        text-decoration: none;
        color: black;
        font-size: 20px;
      }
      h3{
    
    
        width: 180px;
        height: 30px;
        margin: 100px auto;
        text-align: center;
        line-height: 30px;
        background: deepskyblue;
        border-radius: 5px;
      }
    </style>
  </head>
  <body>
  <h3>
    <a href="${pageContext.request.contextPath}/book/allBook">进入书籍页面</a>
  </h3>

  </body>
</html>

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>springmvc</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>springmvc</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>

        <!--encodingFilter-->
        <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>

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