一. Mybatis与Spring的集成
将MyBatis与Spring进行整合,主要解决的问题就是将SqlSessionFactory对象交由Spring容器来管理,所以,该整合,只需要将SqlSessionFactory的对象生成器SqlSessionFactoryBean注册在Spring容器中,再将其注入给Dao的实现类即可完成整合。
1. 导入pom依赖
- 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 - 添加mybatis相关依赖
mybatis核心:mybatis(3.4.5)
Mybatis分页:pagehelper(5.1.2) - spring整合mybatis(1.3.1)
mybatis-spring - 添加dbcp2连接池
commons-dbcp2(2.1.1)
commons-pool2(2.4.3) - 添加日志配置(2.9.1)
log4j-core
log4j-api
log4j-web - 其他
junit(4.12)
javax.servlet-api(4.0.0)
lombok(1.18.2)
<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>
数据库连接池:会初始化n个数据库连接对象,当需要用户请求操作数据库时,那么会直接在数据库连接池中获取连接,用完会放回连接池中。
2. 利用mybatis逆向工程生成模型层层代码
3. 添加配置文件
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
spring-context.xml(核心文件)
<?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"> <!-- spring框架与mybatis整合的配置文件加载到spring上下文中--> <import resource="classpath:spring-mybatis.xml"></import> </beans>
spring-mybatis.xml
1.扫描所有JavaBean,将对应的组件加载到spring上下文中
2.配置数据源(也就是数据库连接池)
3.配置session工厂
4.配置mapper扫描接口
5.配置事务管理器
6.配置aop自动代理
<?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.xissl及子子孙孙包--> <context:component-scan base-package="com.xissl"/> <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/xissl/**/mapper/*.xml"/> <!-- 指定别名 --> <property name="typeAliasesPackage" value="com/xissl/**/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/xissl/**/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>
4. 测试
业务层
package com.xissl.biz; import com.xissl.model.Book; /** * @author xissl * @create 2023-08-25 14:37 */ public interface BookBiz { int deleteByPrimaryKey(Integer bid); int insert(Book record); int insertSelective(Book record); Book selectByPrimaryKey(Integer bid); int updateByPrimaryKeySelective(Book record); int updateByPrimaryKey(Book record); }
package com.xissl.biz.impl; import com.xissl.biz.BookBiz; import com.xissl.mapper.BookMapper; import com.xissl.model.Book; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; /** * @author xissl * @create 2023-08-25 14:38 */ @Service public class BookBizImpl implements BookBiz { @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 public int updateByPrimaryKey(Book record) { return bookMapper.updateByPrimaryKey(record); } }
测试代码
package com.xissl.biz.impl; import com.xissl.biz.BookBiz; import com.xissl.model.Book; import org.junit.After; import org.junit.Before; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import static org.junit.Assert.*; /** * @author xissl * @create 2023-08-25 14:44 */ @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations={"classpath:spring-context.xml"}) public class BookBizImplTest { @Autowired private BookBiz bookBiz; @Before public void setUp() throws Exception { } @After public void tearDown() throws Exception { } @Test public void selectByPrimaryKey() { Book book = bookBiz.selectByPrimaryKey(33); System.out.println(book); } }
运行结果:
二. Aop整合pagehelper插件
好处: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。
切面类:
package com.xissl.aspect; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; import com.xissl.utils.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; /** * @author xissl * @create 2023-08-25 16:48 */ @Aspect //代表当前类为切面类 @Component //代表当前类交给spring进行管理 public class PagerAspect { @Around("execution(* *..*Biz.*Pager(..))") public Object invoke(ProceedingJoinPoint args) throws Throwable{ PageBean pageBean = null; // 获取目标方法中的所有参数 Object[] argsArgs = args.getArgs(); for (Object argsArg : argsArgs) { if(argsArg instanceof PageBean){ pageBean = (PageBean) argsArg; break; } } if(pageBean!=null && pageBean.isPagination()){ PageHelper.startPage(pageBean.getPage(),pageBean.getRows()); } // 执行目标方法 Object proceed = args.proceed(); if(pageBean!=null && pageBean.isPagination()){ PageInfo info = new PageInfo((List) proceed); pageBean.setTotal(info.getTotal()+""); } return proceed; } }
测试代码:
mapper层
<select id="listPager" resultType="com.xissl.model.Book" parameterType="com.xissl.model.Book" > select <include refid="Base_Column_List" /> from t_mvc_book <where> <if test="bname !=null"> and bname like concat('%',#{bname},'%') </if> </where> </select>
业务层
@Override public List<Book> listPager(Book book, PageBean pageBean) { return bookMapper.listPager(book); }
测试:
@Test public void listPager() { Book book = new Book(); PageBean pageBean = new PageBean(); pageBean.setPage(5); pageBean.setRows(10); // book.setBname("圣墟"); this.bookBiz.listPager(book,pageBean).forEach(System.out::println); }
运行结果: