1. 新建maven项目

2. 配置pom.xml导入所需jar包

   1. junit
   2. 数据库驱动
   3. 数据库连接池
   4. Servelt JSP
   5. Mybatis
   6. Spring

   <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>
   

3. 连接数据库
   在Schemas里面选择我们要操作的表

4. 新建pojo文件夹，新建类Books.java

   1. 对Books类的私有属性进行定义
   2. 利用注解生成两种构造方法

5. 数据库参数文件database.properties 里面存放数据库链接，用户名，密码

6. mybatis的dao层

   1. 关联数据库配置文件
   2. 配置数据库连接池
   3. sqlSessionFactory
   4. 配置扫描Dao接口包，动态实现Dao接口注入到spring容器中

7. mybatis_config.xml 配置数据源，交给spring去做

8. applicationContext.xml 总的配置文件，奖spring-dao引入到这里<>

9. 建立dao层，新建dao文件夹，接口BookMapper

   1. 定义增删改查方法
   2. 对方法参数是基本类型的 可以设置@Param(“bookId”)别名

10. 在dao文件夹新建BookMapper.xml 实现接口BookMapper
    注意加表头

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

11. 测试一波(测试不通，先放一放)

12. 接下来是spring

13. 新建service服务层的package

14. 写入接口BookService 和 BookMapper基本一样

15. BookServiceImpl 实现 BookService接口

16. 配置文件spring-service.xml

    1. 扫描service相关的bean
    2. BookServiceImpl注入到IOC容器当中
    3. 配置事务管理器
    4. 注入数据库连接池

17. 将spring-service.xml导入到application.xml中

18. 这里测试就OK了，完成了Mybatis和Spring了

    1. 小坑 sql语句不要写错
    2. 数据库一定要链接上
    3. 强转类型不要转错

19. 接下来是SpringMVC

20. 首先添加web依赖 WEB-INF下新建jsp文件夹 这里前端用jsp写的

21. web层 web.xml DispatcherServlet 加载总的配置文件

22. 新建spring-mvc.xml

    1. 开启SpringMVC注解驱动
    2. 静态资源默认servlet配置
    3. 配置jsp 显示ViewResolver视图解析器
    4. 扫描web相关的bean

23. com.kuang下新建controller文件夹 写控制层的类

24. controller先写一个展示全部书籍的方法

25. jsp下 建 allbook.jsp 写前端代码

26. 配置tomcat

27. 小坑：projectStruct ->Artfact->WEB-INF->新建一个lib包，导入所有的jar包

28. 切记写完一个配置 一定要导入到applicationContext.xml中

29. 接下来是增删改书籍—fighting

30. 加入controller中CURD方法，编写对应的jsp

31. dao层 接口不要随便加@param()，不然不加的就读不到了（麻了，卡了几个小时）
    
    BookController.java

package com.kuang.controller;import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;@Controller
@RequestMapping("/book")
public class BookController {//controller 调 service 层@Autowired@Qualifier("BookServiceImpl")private BookService bookService;// 查询全部的书籍， 并返回一个书籍展示页面@RequestMapping("/allBook")public String List(Model model){List<Books> list = bookService.queryAllBook();model.addAttribute("list",list);return "allBook";}//    增加书籍@RequestMapping("/toAddBook")public String toAddPaper() {return "addBook";}@RequestMapping("/addBook")public String addPaper(Books books) {System.out.println(books);bookService.addBook(books);return "redirect:/book/allBook";}//    修改书籍@RequestMapping("/toUpdateBook")public String toUpdateBook(Model model, int id) {Books books = bookService.queryBookById(id);System.out.println(books);model.addAttribute("book",books );return "updateBook";}@RequestMapping("/updateBook")public String updateBook(Model model, Books book) {System.out.println(book);bookService.updateBook(book);Books books = bookService.queryBookById(book.getBookID());model.addAttribute("books", books);return "redirect:/book/allBook";}//删除书籍@RequestMapping("/del/{bookId}")public String deleteBook(@PathVariable("bookId") int id) {bookService.deleteBooksById(id);return "redirect:/book/allBook";}
}

BookMapper.java

package com.kuang.dao;import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;import java.util.List;public interface BookMapper {int addBook(Books books);int deleteBooksById( int id);int updateBook(Books books);Books queryBookById( int id);List<Books> queryAllBook();
}

BookMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.kuang.dao.BookMapper"><insert id="addBook" parameterType="Books">insert into ssmbuild.books(bookName,bookCounts,detail)values (#{bookName}, #{bookCounts}, #{detail})</insert><delete id="deleteBooksById" parameterType="int">delete from ssmbuild.books where bookID=#{BookId}</delete><update id="updateBook" parameterType="com.kuang.pojo.Books">update ssmbuild.booksset bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}where bookID = #{bookID}</update><select id="queryBookById" resultType="Books">select * from ssmbuild.bookswhere bookID = #{bookID}</select><select id="queryAllBook" resultType="Books">SELECT * from ssmbuild.books</select>
</mapper>

Books.java

package com.kuang.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;
}

BookService.java

package com.kuang.service;import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;import java.util.List;public interface BookService {int addBook(Books books);int deleteBooksById(@Param("bookID") int id);int updateBook(Books books);Books queryBookById(@Param("bookID") int id);List<Books> queryAllBook();
}

BookServiceImpl.java

package com.kuang.service;import com.kuang.dao.BookMapper;
import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;import java.util.List;public class BookServiceImpl implements BookService{private BookMapper bookMapper;public void setBookMapper(BookMapper bookMapper){this.bookMapper = bookMapper;}@Overridepublic int addBook(Books books) {return bookMapper.addBook(books);}@Overridepublic int deleteBooksById(int id) {return bookMapper.deleteBooksById(id);}@Overridepublic int updateBook(Books books) {return bookMapper.updateBook(books);}@Overridepublic Books queryBookById(int id) {return bookMapper.queryBookById(id);}@Overridepublic List<Books> queryAllBook() {return bookMapper.queryAllBook();}
}

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/beanshttp://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>

database.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=false&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456

mybatis_config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><!--配置数据源 交给spring去做--><typeAliases><package name="com.kuang.pojo"/></typeAliases><mappers><mapper class="com.kuang.dao.BookMapper"/></mappers>
</configuration>

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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"><!--    1、关联数据库配置文件--><context:property-placeholder location="classpath:database.properties"/><!--    2、连接池dbcp:半自动 不能自动连接c3p0:自动化 自动加载配置文件druid:hikari--><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><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、sqlSessionFactory--><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource"/><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 --><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/><property name="basePackage" value="com.kuang.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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/mvchttps://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.kuang.controller" /></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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"><!-- 扫描service相关的bean --><context:component-scan base-package="com.kuang.service" /><!--BookServiceImpl注入到IOC容器中--><bean id="BookServiceImpl" class="com.kuang.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>

addBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %><html>
<head><title>新增书籍</title><meta name="viewport" content="width=device-width, initial-scale=1.0"><!-- 引入 Bootstrap --><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">书籍名称：<input type="text" name="bookName"><br><br><br>书籍数量：<input type="text" name="bookCounts"><br><br><br>书籍详情：<input type="text" name="detail"><br><br><br><input type="submit" value="添加"></form></div>

addBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>书籍列表</title><meta name="viewport" content="width=device-width, initial-scale=1.0"><!-- 引入 Bootstrap --><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><div class="row"><div class="col-md-4 column"><a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增</a></div></div><div class="row clearfix"><div class="col-md-12 column"><table class="table table-hover table-striped"><thead><tr><th>书籍编号</th><th>书籍名字</th><th>书籍数量</th><th>书籍详情</th><th>操作</th></tr></thead><tbody><c:forEach var="book" items="${requestScope.get('list')}"><tr><td>${book.getBookID()}</td><td>${book.getBookName()}</td><td>${book.getBookCounts()}</td><td>${book.getDetail()}</td><td><a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.getBookID()}">更改</a> |<a href="${pageContext.request.contextPath}/book/del/${book.getBookID()}">删除</a></td></tr></c:forEach></tbody></table></div></div>
</div>

updateBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>修改信息</title><meta name="viewport" content="width=device-width, initial-scale=1.0"><!-- 引入 Bootstrap --><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>修改信息</small></h1></div></div></div><form action="${pageContext.request.contextPath}/book/updateBook" method="post"><input type="hidden" name="bookID" value="${book.getBookID()}"/>书籍名称：<input type="text" name="bookName" value="${book.getBookName()}"/>书籍数量：<input type="text" name="bookCounts" value="${book.getBookCounts()}"/>书籍详情：<input type="text" name="detail" value="${book.getDetail() }"/><input type="submit" value="提交"/></form>
</div>

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><!--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>

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE HTML>
<html>
<head><title>首页</title><style type="text/css">a {text-decoration: none;color: black;font-size: 18px;}h3 {width: 180px;height: 38px;margin: 100px auto;text-align: center;line-height: 38px;background: deepskyblue;border-radius: 4px;}</style>
</head>
<body><h3><a href="${pageContext.request.contextPath}/book/allBook">点击进入列表页</a>
</h3>
</body>
</html>

pom.xml

<?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>org.example</groupId><artifactId>ssm_my</artifactId><version>1.0-SNAPSHOT</version><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target></properties><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.47</version></dependency><dependency><groupId>com.mchange</groupId><artifactId>c3p0</artifactId><version>0.9.5.2</version></dependency><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><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><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>1.16.10</version></dependency><dependency><groupId>org.jetbrains</groupId><artifactId>annotations</artifactId><version>22.0.0</version></dependency></dependencies><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>

问题： bean 不存在

步骤：
1.查看这个bean注入是否成功
2.Junit单元测试，看我们的代码能否查询出结果
3.问题一定不在我们底层，是spring出了问题！
4.SpringMVC，整合的时候没有调用我们的service层的bean
1.applicationContext没有注册bean
2.web.xml中，我们也绑定过配置文件