整合SSM

环境要求

• IDEA
• MySQL 5.7.19
• Tomcat9
• Maven 3.5.4

数据库准备

CREATE DATABASE ssmbuild;
USE ssmbuild;
CREATE TABLE `books`(
`bookID` INT NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT 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,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢')

基本环境搭建

创建一个普通的maven项目

依赖和资源过滤

<!--        junit测试-->
        <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-->
        <!--        Servlet依赖-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!--        JSP依赖-->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.3.3</version>
            <scope>provided</scope>
        </dependency>
        <!--        jstl表达式的依赖-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

<!--        Mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>

<!--        Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.7.RELEASE</version>
        </dependency>

idea连接数据库

jdbc:mysql://localhost:3306/ssmbuild?serverTimezone=GMT%2B8

编写包结构和配置文件

applicationContext.xml

<?xml version="1.0" encoding="UTF8"?>
<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
        https://www.springframework.org/schema/beans/spring-beans.xsd">

</beans>

mybatis-config.xml

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

</configuration>

Mybatis层编写

db.properties

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

配置数据源mybatis-config.xml

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <package name="com.jmu.pojo"/>
    </typeAliases>
</configuration>

编写Mapper层

• 接口（CRUD）

package com.jmu.mapper;

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

import java.util.List;

public interface BookMapper {
    int addBook(Books book);
    int deleteBook(@Param("bookID") int id);
    int updateBook(Books book);
    Books selectBook(@Param("bookID") int id);
    List<Books> selectAllBook();
}

• xml

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.jmu.mapper.BookMapper">
    <insert id="addBook" parameterType="Books">
        insert into books(bookName, bookCounts, detail)
        values(#{bookName},#{bookCounts},#{detail});
    </insert>
    <delete id="deleteBook">
        delete from books where bookID=#{bookID};
    </delete>
    <update id="updateBook" parameterType="Books">
        update books set
        bookName=#{bookName},bookCounts=#{bookCounts},
        detail=#{detail} where bookID=#{bookID};
    </update>
    <select id="selectBook" resultType="Books">
        select * from books where bookID=#{bookID};
    </select>
    <select id="selectAllBook" resultType="Books">
        select * from books;
    </select>

</mapper>

将mapper绑定到配置文件

<?xml version="1.0" encoding="UTF8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <package name="com.jmu.pojo"/>
    </typeAliases>
    <mappers>
        <mapper class="com.jmu.mapper.BookMapper" />
    </mappers>
</configuration>

编写业务层

package com.jmu.service;

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

import java.util.List;

public interface BookService {
    int addBook(Books book);
    int deleteBook(@Param("bookID") int id);
    int updateBook(Books book);
    Books selectBook(@Param("bookID") int id);
    List<Books> selectAllBook();
}

package com.jmu.service;

import com.jmu.mapper.BookMapper;
import com.jmu.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public class BookServiceImpl implements  BookService{

    //service调用mapper层 组合mapper
   private BookMapper bookMapper;

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

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

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

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

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

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

Spring层编写

• 连接池
  • dbcp:半自动操作 不能自动连接
  • c3p0:自动化操作（自动化的加载配置文件，并且可以设置到对象中）
  • druid

编写spring-mapper.xml

<?xml version="1.0" encoding="UTF8"?>
<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
        https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<!--   1.联数据库配置文件-->
    <context:property-placeholder location="classpath:db.properties" />
<!--    2.连接池-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${driver}" />
        <property name="jdbcUrl" value="${url}"/>
        <property name="user" value="${username}" />
        <property name="password" value="${password}"/>
    </bean>
<!--    3.sqlSessionFactory-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactory">
        <property name="dataSource" ref="dataSource" />
<!--        绑定mybatis配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml" />
    </bean>

<!--    配置mapper接口扫描包，动态实现mapper接口可以注入到Spring接口中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /><!--value 就是3的id-->
        <!--要扫描的mapper包-->
        <property name="basePackage" value="com.jmu.mapper" />
    </bean>
</beans>

编写spring-service.xml

注意每次新建的时候，添加到ApplicationContext

<?xml version="1.0" encoding="UTF8"?>
<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
        https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<!--    1.扫描service下的包-->
    <context:component-scan base-package="com.jmu.service" />
<!--    2.将我们的所有业务类，注入到Spring.可以通过配置，或者注解实现-->
    <bean id="BookServiceImpl" class="com.jmu.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper" />
    </bean>
<!--    3.声明式事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!--        注入数据源-->
        <property name="dataSource" ref="dataSource" />
    </bean>
</beans>

SpringMVC层编写

创建项目为web

编写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">
    <!--    DispatchServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <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>
    <!--    乱码过滤-->
    <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>
    <!-- 允许返回html视图 -->
    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>*.html</url-pattern>
    </servlet-mapping>
    <!--    设置首页-->
    <welcome-file-list>
        <welcome-file>WEB-INFviewindex.html</welcome-file>
    </welcome-file-list>
</web-app>

编写web.xml中的spring-mvc.xml

编写spring-mvc.xml

<?xml version="1.0" encoding="UTF8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc.xsd 
        http://www.springframework.org/schema/context 
        https://www.springframework.org/schema/context/spring-context.xsd">
    <!--1.注解驱动 -->
    <mvc:annotation-driven />
    <!--2.静态资源过滤 -->
    <mvc:default-servlet-handler />
    <!--3.扫描包：controller-->
    <context:component-scan base-package="com.jmu.controller" />
    <!--4.视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
    <!--静态资源映射-->
    <mvc:resources mapping="/js/**" location="/WEB-INF/js/"/>
</beans>

新建spring-mvc.xml中的文件夹jsp

整合

import导入3个classpath

<?xml version="1.0" encoding="UTF8"?>
<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
        https://www.springframework.org/schema/beans/spring-beans.xsd">
    <import resource="classpath:spring-mapper.xml" />
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml" />
</beans>

查询图书

controller

package com.jmu.controller;

import com.jmu.pojo.Books;
import com.jmu.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.RequestMapping;

import java.util.List;

@Controller
public class BookController {
    //controller调用service层
    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    //查询全部书籍，并且返回到一个书籍展示页面
    @RequestMapping("/allbook")
    public String list(Model model){
        List<Books> list = bookService.selectAllBook();
        model.addAttribute("list",list);
        return "allBook";
    }
}

页面

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>查询全部书籍</title>
</head>
<body>
<p>书籍展示</p>
<table>
    <thead>
    <tr>
        <th>图书编号</th>
        <th>图书名称</th>
        <th>图书数量</th>
        <th>图书详情</th>
    </tr>
    </thead>
    <tbody>
        <c:forEach var="book" items="${list}">
            <tr>
                <td>${book.bookID}</td>
                <td>${book.bookName}</td>
                <td>${book.bookCounts}</td>
                <td>${book.detail}</td>
            </tr>
        </c:forEach>
    </tbody>
</table>
</body>
</html>

配置Tomcat

注意在项目结构中添加lib文件夹加jar包

不然会出现报错,一看到ClassNotFoundException，就去看看lib那边是不是加了jar

java.lang.ClassNotFoundException: