MyBatis集成Spring流程详解

目录

• 一、Mybatis与spring集成
• 1. 导入pom依赖
• 2. 编写配置文件
• 3. 使用注解开发
• 4. 测试
• 5. 管理数据源
• 二、Aop整合pagehelper插件
• 要解决的问题

一、Mybatis与spring集成

1. 导入pom依赖

<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>${mybatis.version}</version>
    </dependency>
    <!--mysql-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${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>
<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>
<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>

2. 编写配置文件

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"
       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.xlb"/>
    <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/xlb/**/mapper/*.xml"/>
        <!-- 指定别名 -->
        <property name="typeAliasesPackage" value="com/javaxl/ssm/**/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/javaxl/ssm/**/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>

3. 使用注解开发

@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

4. 测试

我们就可以把BookBizImpl实现类里面添加两个注解，相当于省略了set、get方法

package com.xlb.biz.impl;
import com.xlb.biz.BookBiz;
import com.xlb.mapper.BookMapper;
import com.xlb.model.Book;
import com.xlb.model.BookVo;
import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
import java.util.Map;
@Service
public class BookBizImpl implements BookBiz {
    @Autowired
    private BookMapper bookMapper;
    //Alt+Enter 快速构建实现类，填充代码的前半部分 Ctrl+1
    //Alt+Insert 快速提供set/get/toString/构造方法

    /*public BookMapper getBookMapper() {
        return bookMapper;
    }
    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }*/
    @Override
    public int deleteByPrimaryKey(Integer bid) {
        return bookMapper.deleteByPrimaryKey(bid);
    }
    @Override
    public Book selectByPrimaryKey(Integer bid) {
        return bookMapper.selectByPrimaryKey(bid);
    }
    @Override
    public List<Book> selectByIn(List bookIds) {
        return bookMapper.selectByIn(bookIds);
    }
    public List<Book> selectBooksLike1(String bname){
        return  bookMapper.selectBooksLike1(bname);
    }
    public List<Book> selectBooksLike2(String bname){
        return  bookMapper.
    selectBooksLike2(bname);
}
    public List<Book> selectBooksLike3(String bname){
        return  bookMapper.selectBooksLike3(bname);
    }
    @Override
    public List<Book> list1() {
        return bookMapper.list1();
    }
    @Override
    public List<Book> list2() {
        return bookMapper.list2();
    }
    @Override
    public List<Book> list3(BookVo vo) {
        return bookMapper.list3(vo);
    }
    @Override
    public List<Map> list4() {
        return bookMapper.list4();
    }
    @Override
    public Map list5(Map map) {
        return bookMapper.list5(map);
    }
    @Override
    public List<Book> list6(BookVo bookVo) {
        return bookMapper.list6(bookVo);
    }
    @Override
    public List<Book> list7(BookVo bookVo) {
        return list7(bookVo);
    }
}

5. 管理数据源

管理sqlsession

我们还要给BookMapper.java添加一个标记：

然后在测试类里面添加：

@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration(locations={“classpath:applicationContext-mybatis.xml”})

package com.xlb.biz.impl;
import com.xlb.biz.BookBiz;
import com.xlb.mapper.BookMapper;
import com.xlb.model.BookVo;
import com.xlb.util.SessionUtil;
import com.xlb.biz.impl.BookBizImpl;
import org.apache.ibatis.session.SqlSession;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static org.junit.Assert.*;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:applicationContext-mybatis.xml"})
public class BookBizImplTest {
    private BookBiz bookBiz;
    private SqlSession sqlSession;
    @Before
    public void setUp() throws Exception {
        System.out.println("初始化方法...");
        BookBizImpl bookBiz = new BookBizImpl();
        //工具类中获取session对象
        sqlSession = SessionUtil.openSession();
        System.out.println(sqlSession+"初始化方法");
        //从session对象中获取mapper对象
        BookMapper mapper = sqlSession.getMapper(BookMapper.class);
        bookBiz.setBookMapper(mapper);
        this.bookBiz = bookBiz;
    }
    @After
    public void tearDown() throws Exception {
        System.out.println("方法测试结束...");
        System.out.println(sqlSession);
        sqlSession.commit();
        sqlSession.close();
    }
    @Test
    public void deleteByPrimaryKey() {
        bookBiz.deleteByPrimaryKey(44);
        sqlSession.commit();
        sqlSession.close();
    }
    @Test
    public void selectByPrimaryKey() {
        System.out.println("测试的业务方法...");
        System.out.println(bookBiz.selectByPrimaryKey(44));
    }
    @Test
    public void text3() {
       int[] ints = {1,2,3,4};
       //将数组变为字符串
        StringBuffer sb = new StringBuffer();
        for (int i : ints){
            sb.append(",").append(i);
        }
        String s = sb.toString();
        System.out.println(s.substring(1));
    }
    @Test
    public void selectByIn() {
        List<Integer> integers = Arrays.asList(new Integer[] {33,34,32});
        bookBiz.selectByIn(integers).forEach(System.out::println);
    }
    @Test
    public void selectBooksLike1() {
        bookBiz.selectBooksLike1("%圣嘘%").forEach(System.out::println);
    }
    @Test
    public void selectBooksLike2() {
        bookBiz.selectBooksLike2("%圣嘘%").forEach(System.out::println);
    }
    @Test
    public void selectBooksLike3() {
        bookBiz.selectBooksLike3("圣嘘").forEach(System.out::println);
    }
    @Test
    public void list1() {
        bookBiz.list1().forEach(System.out::println);
    }
    @Test
    public void list2() {
        bookBiz.list2().forEach(System.out::println);
    }
    @Test
    public void list3() {
        BookVo vo = new BookVo();
        vo.setBooKIds(Arrays.asList(new Integer[]{31,32,33,34}));
        bookBiz.list3(vo).forEach(System.out::println);
    }
    @Test
    public void list4() {
        bookBiz.list4().forEach(System.out::println);
    }
    @Test
    public void list5() {
        Map map = new HashMap();
        map.put("bid",32);
        System.out.println(bookBiz.list5(map));
    }
    @Test
    public void list6() {
        BookVo vo = new BookVo();
        vo.setMax(45);
        vo.setMin(35);
        bookBiz.list6(vo).forEach(System.out::println);
    }
    @Test
    public void list7() {
        BookVo vo = new BookVo();
        vo.setMax(45);
        vo.setMin(35);
        bookBiz.list7(vo).forEach(System.out::println);
    }
}

结果

二、Aop整合pagehelper插件

要解决的问题

  @Override
    public List<Map> listPager(Map map, PageBean pageBean) {
        //pageHelper分页插件相关代码
        if(pageBean != null && pageBean.isPagination()){
            PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
        }
        List<Map> maps=bookMapper.listPager(map,pageBean);
        if(pageBean != null && pageBean.isPagination()){
            //处理查询结果的前提，是需要分页的
            PageInfo info=new PageInfo(maps);
            pageBean.setTotal(info.getTotal()+"");
        }
        return maps;
    }

可以使用AOP编程解决分页代码重复的问题，省掉重复的代码。

根据Spring aop所学，我们可以利用环绕通知来解决；

1、找到目标对象 -> *Biz.*Pager

2、写通知

目标对象该方法一定携带了PageBean对象

注解：@aspect：相当于配置了环绕通知

@component：交给Spring进行管理

@excution

建立一个切面类：PageAspect

package com.xlb.ssm.aspect;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.xlb.ssm.entity.PageBean;
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;
@Component
@Aspect
public class PageAspect {
    /**
     * *：返回值
     * *..：无限包
     * *Service：以Service结尾的接口名
     * .Pager：以Pager方法
     * 只要同时匹配上诉四个条件，就会被列为目标对象
     * 上诉配置要生效，代理注释一定要打开：<aop:aspectj-autoproxy/>
     * @param args
     * @return
     * @throws Throwable
     */
    @Around("execution(* *..*Biz.*Pager(..))")
    public Object invoke(ProceedingJoinPoint args) throws Throwable {
        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(null != pageBean && pageBean.isPagination()){
            PageInfo pageInfo = new PageInfo((List) list);
            pageBean.setTotal(pageInfo.getTotal()+"");
        }
        return list;
    }
}

@Around：代表这是一个环绕通知

测试一下

    @Test
    public void listPager() {
        Map map=new HashMap();
        map.put("bname","圣墟");
        //查询出第二页的20条数据
        PageBean pageBean=new PageBean();
        pageBean.setPage(2);
        pageBean.setRows(20);
        bookBiz.listPager(map,pageBean).forEach(System.out::println);
    }

结果：

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