SSM整合

1.创建web工程

2.导入依赖

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
    <!-- 配置全局spring版本 -->
    <spring.version>5.2.6.RELEASE</spring.version>
  </properties>

  <dependencies>

    <!-- spring -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <!-- 配置版本-->
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.6.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.9.4</version>
    </dependency>

    <!-- mybatis -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.20</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.19</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>

    <!-- springmvc -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.11.0</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

  </dependencies>

3.使用逆向工程生成pojo，mapper以及mapper.xml文件

（ 注意：生成的代码拷贝至工程的指定位置，并在Mapper上加@Repository注解 ）

4. 编写 Service

package com.qf.service;

import com.qf.pojo.TbMusic;

import java.util.List;

public interface MusicService {

    List<TbMusic> findAll();

}

5.编写ServiceImpl

package com.qf.service.impl;

import com.qf.dao.TbMusicMapper;
import com.qf.pojo.TbMusic;
import com.qf.service.MusicService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class MusicServiceImpl implements MusicService {

    @Autowired
    private TbMusicMapper tbMusicMapper;

    @Override
    public List<TbMusic> findAll() {
        return tbMusicMapper.selectByExample(null);
    }

}

6. 编写Controller

package com.qf.controller;

import com.qf.pojo.TbMusic;
import com.qf.service.MusicService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("music")
public class MusicController {

    @Autowired
    private MusicService musicService;

    @RequestMapping("findAll")
    public List<TbMusic> findAll(){
        return musicService.findAll();
    }
}

7.编写 jdbc.properties

jdbc.username = root
jdbc.password= root
jdbc.url = jdbc:mysql:///wyy_music?serverTimezone=Asia/Shanghai
jdbc.driverClassName = com.mysql.cj.jdbc.Driver

8.编写 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>

9.编写 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"
       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
       
        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/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">
    
    <!-- 扫描指定包下的注解 -->
    <context:component-scan base-package="com.qf">
        <!-- 不扫描指定的注解 -->
        <!-- <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />-->
    </context:component-scan>

    <!-- 引入外包properties文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!-- 配置数据源 -->
    <bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="driverClassName" value="${jdbc.driverClassName}"></property>
    </bean>

    <!-- 配置sqlSessionFactoryBean -->
    <bean name="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 配置数据源 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 引入mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
    </bean>

    <!-- 扫描mapper.xml配置文件 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.qf.dao"></property>
    </bean>

    <!-- 配置事务平台管理器 -->
    <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 配置事务通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="find*" isolation="DEFAULT" propagation="REQUIRED" read-only="true"/>
        </tx:attributes>
    </tx:advice>

    <!-- 配置事务-->
    <aop:config>
        <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.qf.service.impl.*ServiceImpl.*(..))"></aop:advisor>
    </aop:config>

</beans>

10. 编写 springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       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
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 扫描指定包下的注解 -->
    <context:component-scan base-package="com.qf.controller"/>
    <!-- 设置静态资源可以访问 -->
    <mvc:default-servlet-handler/>
    <!-- 注解配置 -->
    <mvc:annotation-driven/>
    <!-- 配置视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 前缀和后缀 -->
        <!-- <property name="prefix" value=""></property>-->
        <!-- <property name="suffix" value=""></property>-->
    </bean>
</beans>

11.编写web.xml

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
    <display-name>Archetype Created Web Application</display-name>

    <!-- 配置applicationContext.xml-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

    <!-- 通过监听的方式去加载applicationContext.xml-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- 前端过滤器 -->
    <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>

</web-app>

12.测试

添加分页操作

1.导入依赖

<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper</artifactId>
    <version>5.1.11</version>
</dependency>

2.配置分页插件（两种方式）

2.1 第一种：在 applicationContext.xml 中添加配置

<!-- 配置sqlSessionFactoryBean -->
    <bean name="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 配置数据源 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 引入mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>

        <property name="plugins">
            <set>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <props>
                            <!-- 数据库方言，可选择：oracle,mysql,mariadb 等-->
                            <prop key="helperDialect">mysql</prop>
                            <!--reasonable：分页合理化参数，默认值：false。
                            当该参数设置为true时，pageNum<=0时会查询第一页，
                            pageNum>pages（超过总数时），会查询最后一页-->
                            <prop key="reasonable">true</prop>
                            <!--supportMethodsArguments：
                            是否支持通过 Mapper 接口参数来传递分页参数，默认值：false-->
                            <prop key="supportMethodsArguments">true</prop>
                        </props>
                    </property>
                </bean>
            </set>
        </property>

    </bean>

2.2 第二种：在 mybatis-config.xml 中添加配置

<?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>

    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor">
            <property name="helperDialect" value="mysql"/>
            <property name="reasonable" value="true"/>
            <property name="supportMtehodsArguments" value="true"/>
        </plugin>
    </plugins>

</configuration>

3.在 controller 中添加方法

@RequestMapping("findPage")
    public PageInfo findPage(
        @RequestParam(required = false,defaultValue = "1") Integer pageNum,
        @RequestParam(required = false,defaultValue = "2") Integer pageSize){

        PageHelper.startPage(pageNum,pageSize);
        List<TbMusic> list = musicService.findAll();

        PageInfo pageInfo = new PageInfo(list);

        return pageInfo;
    }