7.ssm整合

7.1环境要求

环境：

IDEA
MySQL 5.7.19
Tomcat 9
Maven 3.6

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；

7.2创建books数据库

7.3基本环境搭建

新建maven项目

导入pom依赖

<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>
            <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>
</dependencies>

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>

建立基本的包结构和配置框架

com.lwj.pojo
com.lwj.dao
com.lwj.service
com.lwj.controller

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>

applicationContext.xml（spring核心配置文件）

<?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>

7.4Mybatis层编写

编写数据库配置文件

jdbc.driver=com.mysql.jdbc.Driver
#如果使用的MySQL8.0以上版本，增加一个时区配置
jdbc.url=jdbc:mysql://localhost:3306/mybatis_test
jdbc.username=root
jdbc.password=liwenjie

编写mybatis配置文件

    <!--日志-->
 <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
 </settings>
<typeAliases>
    <package name="com.lwj.pojo"/>
</typeAliases>
<mappers>
    <mapper resource="mappers/BookMapper.xml"/>
</mappers>

idea关联数据库

编写数据库对应的实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;
}

编写dao层mapper接口

public interface BookMapper {
    //增加一本书
    int addBook(Books book);
    //删除一本书
    int deleteBookById(int id);
    //更新一本书
    int updateBook(Books book);
    //查询一本书
    Books queryBookById(int id);
    //查询全部书
    List<Books> queryAllBook();

}

编写mapper接口对应的mapper文件，放到resource/mappers/BookMapper.xml下

<?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.lwj.dao.BookMapper">

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

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

    <!--更新Book-->
    <update id="updateBook" parameterType="Books">
        update 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 books
        where bookID = #{bookID}
    </select>

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

</mapper>

编写业务层Service的接口和实现类

package com.lwj.service;

import com.lwj.pojo.Books;

import java.util.List;

public interface BookService {
    //增加一本书
    int addBook(Books book);
    //删除一本书
    int deleteBookById(int id);
    //更新一本书
    int updateBook(Books book);
    //查询一本书
    Books queryBookById(int id);
    //查询全部书
    List<Books> queryAllBook();
}

package com.lwj.service;

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

import java.util.List;
@Service
public class BookServiceImpl implements BookService {
    //service 调dao层
    @Autowired
    private BookMapper bookMapper;

    //之后让spring来注入
    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 book) {
        return bookMapper.updateBook(book);
    }

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

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

mybatis层到此为止，整合完毕

7.5spring层编写

配置Spring整合MyBatis，我们这里数据源使用c3p0连接池；

我们去编写Spring整合Mybatis的相关的配置文件； 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">
    <!--关联数据库配置文件-->
    <context:property-placeholder location="database.properties"></context:property-placeholder>
    <!--连接池
    dbcp:半自动化操作，不能自动连接
    c3p0:自动化操作（自动化加载配置文件，并且自动设置到对象中）
    druid:
    hikari：
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>

        <!-- 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>
    <!--sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <!--绑定mybatis的配置文件-->
        <property name="configLocation" value="mybatis-config.xml"></property>
    </bean>

    <!--配置dao接口扫描包，动态的实现了dao接口可以注入到spring容器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
        <!--扫描dao包-->
        <property name="basePackage" value="com.lwj.dao"></property>
    </bean>


</beans>

spring整合service

新建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 https://www.springframework.org/schema/context/spring-context.xsd">

    <!--扫描service下的包-->
    <context:component-scan base-package="com.lwj.service"></context:component-scan>

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

    <!--声明式事务-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!--aop横切事务-->


</beans>

7.6springMVC层

添加web支持

配置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>
            <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>

新建spring-mvc.xml

配置springMVC

<?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.lwj.controller" />

</beans>

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

在web-inf下建立jsp文件夹，配置结束

7.7配置tomcat

在第一个springMVC程序文章中已经详细介绍了，这里就不再累述。

添加tomcat；

配置tomcat项目；

配置artifacts，添加lib文件夹，导入全部包，否则404

7.8排错思路

查看bean是否注入成功
Junit单元测试，看我们代码是否能查询结果
问题一定不在底层，是spring出问题
springMVC整合的时候没有调用service层的bean
- applicationContext.xml没有注入bean
- web.xml中绑定配置文件

7.9查询全部书籍并显示

编写查询controller

@Controller
@RequestMapping("book")
public class BookController {
    //Controller调service层
    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

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

前台展示页面

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: liwen
  Date: 2020/2/18
  Time: 11:14
  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>
</head>
<body>
<h1>书籍展示</h1>
<div>
    <table>
        <thead>
            <tr>
                <td>书籍编号</td>
                <td>书籍名称</td>
                <td>书籍数量</td>
                <td>书籍详情</td>
            </tr>
        </thead>
        <tbody>
            <%--书籍从数据库中查询出来，从这个list中遍历出来--%>
            <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>
</div>
</body>
</html>

7.10添加书籍

新增书籍jsp

<%--
  Created by IntelliJ IDEA.
  User: liwen
  Date: 2020/2/18
  Time: 13:11
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>

<form action="/book/addBook">
    书籍名称：<input type="text" name="bookName"><br>
    书籍数量：<input type="text" name="bookCounts"><br>
    书籍简介：<input type="text" name="detail"><br>
    <input type="submit">

</form>

</body>
</html>

Controller编写

首先跳转到新增页面，提交接口到addBook，添加数据，然后重定向到http://localhost:8080/book/allBook

//跳转到增加页面
@RequestMapping("toAddBookPage")
public String toAddBookPage(Model model){
    return "addBook";
}
@RequestMapping("addBook")
public String addBook(Books books){
    bookService.addBook(books);
    return "redirect:allBook";
}