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:
