Mybatis与spring集成

1、导入pom依赖

1.1 添加spring相关依赖(5.0.2.RELEASE)

       spring-core

       spring-beans

       spring-context

       spring-orm

       spring-tx

       spring-aspects

       spring-web

   1.2 添加mybatis相关依赖

           mybatis核心：mybatis(3.4.5)

           Mybatis分页：pagehelper(5.1.2) 

   1.3 spring整合mybatis(1.3.1)

          mybatis-spring 

   1.4 添加dbcp2连接池

         commons-dbcp2(2.1.1)

         commons-pool2(2.4.3) 

   1.5 添加日志配置(2.9.1)

          log4j-core

          log4j-api

          log4j-web 

   1.6 其他

         junit(4.12)

         javax.servlet-api(4.0.0)

         lombok(1.18.2)

   注：使用mybatis-generator插件，pom文件添加支持 

 pom依赖：

<?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>com.cjh</groupId>
  <artifactId>ssm</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>ssm Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.plugin.version>3.7.0</maven.compiler.plugin.version>

    <!--添加jar包依赖-->
    <!--1.spring 5.0.2.RELEASE相关-->
    <spring.version>5.0.2.RELEASE</spring.version>
    <!--2.mybatis相关-->
    <mybatis.version>3.4.5</mybatis.version>
    <!--mysql-->
    <mysql.version>5.1.44</mysql.version>
    <!--pagehelper分页jar依赖-->
    <pagehelper.version>5.1.2</pagehelper.version>
    <!--mybatis与spring集成jar依赖-->
    <mybatis.spring.version>1.3.1</mybatis.spring.version>
    <!--3.dbcp2连接池相关 druid-->
    <commons.dbcp2.version>2.1.1</commons.dbcp2.version>
    <commons.pool2.version>2.4.3</commons.pool2.version>
    <!--4.log日志相关-->
    <log4j2.version>2.9.1</log4j2.version>
    <!--5.其他-->
    <junit.version>4.12</junit.version>
    <servlet.version>4.0.0</servlet.version>
    <lombok.version>1.18.2</lombok.version>
  </properties>


  <dependencies>
    <!--1.spring相关-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-orm</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!--2.mybatis相关-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <!--2.mybatis相关-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <!--mysql-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql.version}</version>
    </dependency>
    <!--pagehelper分页插件jar包依赖-->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>${pagehelper.version}</version>
    </dependency>
    <!--mybatis与spring集成jar包依赖-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${mybatis.spring.version}</version>
    </dependency>
    <!--3.dbcp2连接池相关-->
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-dbcp2</artifactId>
      <version>${commons.dbcp2.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-pool2</artifactId>
      <version>${commons.pool2.version}</version>
    </dependency>
    <!--4.log日志相关依赖-->
    <!--核心log4j2jar包-->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-core</artifactId>
      <version>${log4j2.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-api</artifactId>
      <version>${log4j2.version}</version>
    </dependency>
    <!--web工程需要包含log4j-web，非web工程不需要-->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-web</artifactId>
      <version>${log4j2.version}</version>
    </dependency>
    <!--5.其他-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>${junit.version}</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>${servlet.version}</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>${lombok.version}</version>
      <scope>provided</scope>
    </dependency>


  </dependencies>

  <build>
    <finalName>ssm</finalName>
    <resources>
      <!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题-->
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
        </includes>
      </resource>
      <!--解决mybatis-generator-maven-plugin运行时没有将jdbc.properites文件放入target文件夹的问题-->
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>jdbc.properties</include>
          <include>*.xml</include>
        </includes>
      </resource>
    </resources>

    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>${maven.compiler.plugin.version}</version>
          <configuration>
            <source>${maven.compiler.source}</source>
            <target>${maven.compiler.target}</target>
            <encoding>${project.build.sourceEncoding}</encoding>
          </configuration>
        </plugin>
        <plugin>
          <groupId>org.mybatis.generator</groupId>
          <artifactId>mybatis-generator-maven-plugin</artifactId>
          <version>1.3.2</version>
          <dependencies>
            <!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
            <dependency>
              <groupId>mysql</groupId>
              <artifactId>mysql-connector-java</artifactId>
              <version>${mysql.version}</version>
            </dependency>
          </dependencies>
          <configuration>
            <overwrite>true</overwrite>
          </configuration>
        </plugin>

        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

利用mybatis逆向工程生成模型层层代码 

 注解式开发

   1.开启注解   

 <!--1. 注解式开发 -->
   <!-- 注解驱动 -->
   <context:annotation-config/>
   <!-- 用注解方式注入bean，并指定查找范围：com.javaxl.ssm及子子孙孙包-->
   <context:component-scan base-package="com.javaxl.ssm"/>

2.引入外部jdbc配置文件

  <context:property-placeholder location="classpath:jdbc.properties"/>

3. 配置dbcp2数据库连接池

  4. spring和mybatis整合 

  5 注解式事物配置

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager" /

6 开启动态代理

 <aop:aspectj-autoproxy/>

7 注解式开发

   @Repository：将DAO类声明为Bean

   @Service：通常作用在业务层

   @Constroller：通常作用在控制层，将在Spring MVC中使用

   @Component：是一个泛化的概念，仅仅表示spring中的一个组件（Bean），可以作用在任何层次

   @Scope：模式声明（singleton|prototype）

   @Autowired：将自动在代码上下文与其匹配（默认是类型匹配）的Bean，并自动注入到相应的地方

   @Resource：

   1）@Resource后面没有任何内容，默认通过name属性去匹配bean，找不到再按type去匹配

   2）指定了name或者type则根据指定的类型去匹配bean

   3）指定了name和type则根据指定的name和type去匹配bean，任何一个不匹配都将报错

   问题：@Autowired和@Resource两个注解的区别：

   1）@Autowired默认按照byType方式进行bean匹配，@Resource默认按照byName方式进行bean匹配

   2）@Autowired是Spring的注解，@Resource是J2EE的注解，这个看一下导入注解的时候这两个注解的包名就一清二楚了

   Spring属于第三方的，J2EE是Java自己的东西，因此，建议使用@Resource注解，以减少代码和Spring之间的耦合。

   @Transactional

   注：个人感觉注解式事务比以前的声明式事务更加麻烦，要写的东西更多

applicationContext-Mybatis.xml 这是spring整合mybatis 的配置文件

<?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:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">


    <!--1. 注解式开发 -->
    <!-- 注解驱动 -->
    <context:annotation-config/>
    <!-- 用注解方式注入bean，并指定查找范围：com.javaxl.ssm及子子孙孙包-->
    <context:component-scan base-package="com.cjh"/>

    <context:property-placeholder location="classpath:jdbc.properties"/>

    <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"
          destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <!--初始连接数-->
        <property name="initialSize" value="10"/>
        <!--最大活动连接数-->
        <property name="maxTotal" value="100"/>
        <!--最大空闲连接数-->
        <property name="maxIdle" value="50"/>
        <!--最小空闲连接数-->
        <property name="minIdle" value="10"/>
        <!--设置为-1时，如果没有可用连接，连接池会一直无限期等待，直到获取到连接为止。-->
        <!--如果设置为N（毫秒），则连接池会等待N毫秒，等待不到，则抛出异常-->
        <property name="maxWaitMillis" value="-1"/>
    </bean>

    <!--4. spring和MyBatis整合 -->
    <!--1) 创建sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 指定数据源 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 自动扫描XxxMapping.xml文件，**任意路径 -->
        <property name="mapperLocations" value="classpath*:com/cjh/**/mapper/*.xml"/>
        <!-- 指定别名 -->
        <property name="typeAliasesPackage" value="com/cjh/**/model"/>
        <!--配置pagehelper插件-->
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <value>
                            helperDialect=mysql
                        </value>
                    </property>
                </bean>
            </array>
        </property>
    </bean>

    <!--2) 自动扫描com/javaxl/ssm/**/mapper下的所有XxxMapper接口(其实就是DAO接口)，并实现这些接口，-->
    <!--   即可直接在程序中使用dao接口，不用再获取sqlsession对象-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--basePackage 属性是映射器接口文件的包路径。-->
        <!--你可以使用分号或逗号 作为分隔符设置多于一个的包路径-->
        <property name="basePackage" value="com/cjh/**/mapper"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
    <tx:annotation-driven transaction-manager="transactionManager" />
    <aop:aspectj-autoproxy/>

</beans>

applicationContext.xml
spring核心配置文件中 引入 applicationContext-mybatis.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">

   <!--整合Mybastis框架-->
    <import resource="applicationContext-Mybatis.xml"></import>
</beans> 

Spring Test+junit完美组合

在工程的pom文件中增加spring-test的依赖

 <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-test</artifactId>
       <version>${spring.version}</version>
     </dependency>

2 创建BaseTestCase，并在该类上加上两个注解

   @RunWith(SpringJUnit4ClassRunner.class)

   @ContextConfiguration(locations={"classpath:applicationContext.xml"})

相关代码：

service层：

package com.cjh.service;

import com.cjh.model.Book;
import com.cjh.util.PageBean;

import java.util.List;
import java.util.Map;

/**
 * @author
 * @site
 * @company
 * @create 2019-09-24 11:53
 */
public interface BookService {
    int deleteByPrimaryKey(Integer bid);

    int insert(Book record);

    int insertSelective(Book record);

    Book selectByPrimaryKey(Integer bid);

    int updateByPrimaryKeySelective(Book record);

    int updateByPrimaryKey(Book record);

    List<Map> aaaa(Map map, PageBean pageBean);

    List<Map> listPager(Map map, PageBean pageBean);
}

bookservieimpl

package com.cjh.service.Impl;

import com.cjh.mapper.BookMapper;
import com.cjh.model.Book;
import com.cjh.service.BookService;
import com.cjh.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;

/**
 * @author
 * @site
 * @company
 * @create 2019-09-24 11:54
 */
@Service
public class BookServiceImpl implements BookService {
    @Autowired
    private BookMapper bookMapper;
    @Override
    public int deleteByPrimaryKey(Integer bid) {
        return bookMapper.deleteByPrimaryKey(bid);
    }

    @Override
    public int insert(Book record) {
        return bookMapper.insert(record);
    }

    @Override
    public int insertSelective(Book record) {
        return bookMapper.insertSelective(record);
    }

    @Override
    public Book selectByPrimaryKey(Integer bid) {
        return bookMapper.selectByPrimaryKey(bid);
    }

    @Override
    public int updateByPrimaryKeySelective(Book record) {
        return bookMapper.updateByPrimaryKeySelective(record);
    }

    @Override
   }

SpringBaseTest.java：

package com.cjh;

import com.cjh.model.Book;
import com.cjh.util.PageBean;
import org.junit.Before;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * @author
 * @site
 * @company
 * @create 2019-09-24 11:48
 *
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext.xml"})

public class SpringBaseTest {
    protected Book book;
    protected PageBean pageBean;

    @Before
    public void init(){
        book = new Book();
        pageBean = new PageBean();
    }

}

测试：

package com.cjh.service.Impl;

import com.cjh.SpringBaseTest;
import com.cjh.model.Book;
import com.cjh.service.BookService;
import com.cjh.util.StringUtils;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.junit.Assert.*;

/**
 * @author
 * @site
 * @company
 * @create 2019-09-24 12:00
 */
public class BookServiceImplTest extends SpringBaseTest {

    @Autowired
    private BookService bookService;

    @Test
    public void insert() {
        book.setBid(10006);
        book.setBname("T224 ssm");
        book.setPrice(996f);
        this.bookService.insert(book);
    }

    @Test
    public void selectByPrimaryKey() {
        Book book = this.bookService.selectByPrimaryKey(10006);
        System.out.println(book);
    }
}

结果：

 Aop整合pagehelper插件 

注意：记得开动态代理

使用AOP编程解决分页代码重复的问题

   @Around("execution(* *..*Service.*pager(..))")

   public Object invoke(ProceedingJoinPoint args)

语法结构：execution(方法修饰符  方法返回值  方法所属类 匹配方法名 (  方法中的形参表 )  方法申明抛出的异常  )

"*"  ：代表一个任意类型的参数；

“..”：代表零个或多个任意类型的参数。

PagerAspect

package com.cjh;

import com.cjh.util.PageBean;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

import java.util.List;

/**
 * @author
 * @site
 * @company
 * @create 2019-09-24 13:36
 *
 * 处理* *..*Service.*Pager这个方法，只要调用这个方法，就能够达到分页的效果
 *
 * pageHelper.start()
 * 调用目标方法之前
 * 处理结果集
 * 。*Pager(map pagebean)
 *
 */
@Component
@Aspect
public class PagerAspect {

    @Around("execution(* *..*Service.*Pager(..))")//切面
    public Object invoke(ProceedingJoinPoint args) throws Throwable{
//判断符合条件的方法是否包含pagebean参数
        Object[] params = args.getArgs();
        PageBean pageBean = null;
        for (Object param : params) {
            if(param instanceof  PageBean){
                pageBean = (PageBean) param;
                break;
            }

        }

        if(pageBean !=null &&pageBean.isPagination() ){
            PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
        }

        Object list = args.proceed(params);

        if(pageBean !=null &&pageBean.isPagination() ){
            PageInfo pageInfo = new PageInfo((List) list);
            pageBean.setTotal(pageInfo.getTotal()+"");
        }

        return list;
    }
}

测试代码

List<Map>list(Map map);

BooKMapper.xml

  <select id="aaaa" resultType="java.util.Map" parameterType="java.util.Map">
    select * from t_mvc_book
    <where>
      <if test="null !=bname and bname !=''">
        and bname like #{bname}
      </if>
    </where>
  </select>

service:

  List<Map> aaaa(Map map, PageBean pageBean);

    List<Map> listPager(Map map, PageBean pageBean);

bookserviceimpl;

  @Override
    public List<Map> aaaa(Map map, PageBean pageBean) {
        return bookMapper.aaaa(map);
    }

    @Override
    public List<Map> listPager(Map map, PageBean pageBean) {
        return bookMapper.aaaa(map);
    }

测试：

 @Test
    public void aaaa() {
        Map map = new HashMap();
        map.put("bname", StringUtils.toLikeStr("圣墟"));
        List<Map> aaaa = this.bookService.aaaa(map, pageBean);
        for (Map m : aaaa) {
            System.out.println(m);
        }
    }

    @Test
    public void listPager() {
        Map map = new HashMap();
        map.put("bname", StringUtils.toLikeStr("圣墟"));
        pageBean.setPage(3);
        List<Map> maps = this.bookService.listPager(map, pageBean);
        for (Map m : maps) {
            System.out.println(m);
        }
    }

aaaa的结果：

listpager: