Spring框架/Spring+SpringMVC+MyBatis整合

此次SSM整合基于黑马教程SSM整合基于黑马教程（使用druid连接池）

1. 创建一个带web的Maven工程，基于JDK 1.8，这里就不赘述；

2. 引入Maven依赖，此次主要用到的有Spring家族 5.2.6 版本、MyBatis 3.5.4 版本、MyBatis-Spring 2.0.4版本、Druid数据库连接池、MySQL驱动、Servlet、JSTL等，具体如下：

<dependencies>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.2.6.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.2.6.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>5.2.6.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>5.2.6.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-tx</artifactId>
    <version>5.2.6.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.4</version>
  </dependency>
  <dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>2.0.4</version>
  </dependency>
  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.22</version>
  </dependency>
  <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.20</version>
  </dependency>
  <dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>4.0.1</version>
    <scope>provided</scope>
  </dependency>
  <dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>jsp-api</artifactId>
    <version>2.0</version>
    <scope>provided</scope>
  </dependency>
  <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.30</version>
  </dependency>
  <dependency>
    <groupId>jstl</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
  </dependency>
  <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.13</version>
    <scope>compile</scope>
  </dependency>
  <dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.9.5</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aop</artifactId>
    <version>5.2.6.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>5.2.6.RELEASE</version>
  </dependency>
</dependencies>

1. 创建基础Controller层、Service层、Dao层和Domain层；

• Account实体类

import java.io.Serializable;
import java.util.Objects;

public class Account implements Serializable {
    private Integer id;
    private String name;
    private Double money;

    public Account() {
    }

    public Account(Integer id, String name, Double money) {
        this.id = id;
        this.name = name;
        this.money = money;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                '}';
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof Account)) return false;
        Account account = (Account) o;
        return Objects.equals(getId(), account.getId()) &&
                Objects.equals(getName(), account.getName()) &&
                Objects.equals(getMoney(), account.getMoney());
    }

    @Override
    public int hashCode() {
        return Objects.hash(getId(), getName(), getMoney());
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getMoney() {
        return money;
    }

    public void setMoney(Double money) {
        this.money = money;
    }
}

这里可以使用 Lombok 化简过程。

• AccountService 接口

import cn.itcast.domain.Account;

import java.util.List;

public interface AccountService {
    //查询数据库所有数据
    List<Account> findAll();

    //存储指定 Account 类型数据
    void saveAccount(Account account);
}

• AccountServiceImpl 实现类

//这里需要添加Service注解，括号里面可以起别名
@Service("accountService")
public class AccountServiceImpl implements AccountService {

    //使用 Autowired 自动注入
    @Autowired
    private AccountDao accountDao;

    public List<Account> findAll() {
        System.out.println("业务层，查询所有账户");
        return accountDao.findAll() ;
    }

    public void saveAccount(Account account) {
        System.out.println("业务层：保存账户");
        accountDao.saveAccount(account);
    }
}

• AccountDao 操作数据库接口

import cn.itcast.domain.Account;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public interface AccountDao {
    @Select("select * from account")
    List<Account> findAll();

    @Insert("insert into account (name, money) values(#{name},#{money})")
    void saveAccount(Account account);
}

• AccountController

import cn.itcast.domain.Account;
import cn.itcast.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
@RequestMapping("/account")
public class AccountController {

    @Autowired
    private AccountService accountService;

    @RequestMapping("/findAll")
    public String findAll(Model model){
        System.out.println("表现层：查询所有账户");
        List<Account> list = accountService.findAll();
        model.addAttribute("list", list);
        return "list";
    }
}

1. 创建数据库和account表

create table account
(
    id    int auto_increment
        primary key,
    name  varchar(20) null,
    money double      null
);

添加如下测试数据：

1. 配置 web.xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
         xmlns="http://java.sun.com/xml/ns/j2ee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<!--Spring监听器，默认只加载WEB-INF目录下的applicationContext.xml配置文件-->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--    设置配置文件路径-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
<!--SpringMVC前端控制器-->
    <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:springmvc.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>

<!--    解决中文乱码-->
    <filter>
        <filter-name>characterEncodingFilter</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>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

1. 配置 applicationContext.xml(Spring 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"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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
        http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--开启注解扫描,controller不需要Spring处理-->
    <context:component-scan base-package="cn.itcast">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!--    Spring整合MyBatis框架-->
    <!--    配置连接池-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <!-- 基本属性 url、user、password -->
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/ssm"/>
        <property name="username" value="root"/>
        <property name="password" value="3570"/>

        <!-- 配置初始化大小、最小、最大 -->
        <property name="initialSize" value="1"/>
        <property name="minIdle" value="3"/>
        <property name="maxActive" value="20"/>

        <!-- 配置获取连接等待超时的时间 -->
        <property name="maxWait" value="60000"/>

        <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
        <property name="timeBetweenEvictionRunsMillis" value="60000"/>

        <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="300000"/>
    </bean>
    <!--    配置SqlSessionFactory工厂-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--    配置AccountDao接口-->
    <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="cn.itcast.dao"/>
    </bean>

    <!--配置Spring框架声明式事务管理-->
    <!--1. 配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!-- 2. 配置事务属性 -->
    <!--<tx:advice>元素声明事务通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!-- 根据方法名指定事务的属性 -->
            <tx:method name="*"/>
            <!--propagation配置事务传播行为-->
            <tx:method name="purchase" propagation="REQUIRES_NEW"/>
            <!--isolation配置事务的隔离级别-->
            <tx:method name="update*" isolation="SERIALIZABLE"/>
            <!--rollback-for配置事务遇到异常必须回滚，no-rollback-for配置事务遇到异常必须不能回滚-->
            <tx:method name="add*" rollback-for="java.io.IOException"
                       no-rollback-for="com.dmsd.spring.tx.BookStockException"/>
            <!--read-only配置事务只读属性-->
            <tx:method name="find*" read-only="true"/>
            <!--timeout配置事务的超时属性-->
            <tx:method name="get*" timeout="3"/>
        </tx:attributes>
    </tx:advice>
    <!-- 3. 配置事务切入点, 以及把事务切入点和事务属性关联起来 -->
    <aop:config>
        <aop:pointcut expression="execution(* cn.itcast.service.*.*(..))"
                      id="txPointCut"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>
</beans>

1. 配置 springmvc.xml (SpringMVC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"
       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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--开启注解扫描-->
    <context:component-scan base-package="cn.itcast">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <!--    配置视图解析器-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--    过滤静态资源-->
    <mvc:resources location="/css/" mapping="/css/**"/>
    <mvc:resources location="/images/" mapping="/images/**"/>
    <mvc:resources location="/js/" mapping="/js/**"/>

    <!--    开启springmvc注解支持-->
    <mvc:annotation-driven/>
</beans>

1. 创建JSP页面

• index.jsp

<%--
  Created by IntelliJ IDEA.
  User: sxl
  Date: 2020/5/30
  Time: 22:05
  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>
<a href="account/findAll">测试</a>
<h3>测试保存</h3>
<form action="/account/save" method="post">
    姓名：<input type="text" name="name"/><br>
    金额：<input type="text" name="money"/><br>
    <input type="submit" value="保存"><br>
</form>
</body>
</html>

• list.jsp

<%--
  Created by IntelliJ IDEA.
  User: sxl
  Date: 2020/5/30
  Time: 22:07
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h3>查询所有账户信息</h3>
    <c:forEach items="${list}" var="account">
        ${account.name}
    </c:forEach>
</body>
</html>

1. 配置 Tomcat 服务器，配置如下图所示：

配置完成后目录结构如下图所示：

1. 启动服务器，测试查询和保存功能，页面显示出 数据库中用户信息则证明整合成功。