1.项目前期准备
1.1 导入maven jar包
<dependencies><!-- spring依赖 --><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.2.5.RELEASE</version></dependency><!-- spring事务依赖 --><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>5.2.5.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.5.RELEASE</version></dependency><!-- mybatis依赖 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.1</version></dependency><!-- mybatis和spring集成依赖 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.3.1</version></dependency><!-- mysql驱动 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.9</version></dependency><!-- 阿里的连接池 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.12</version></dependency><!-- 单元测试 --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency></dependencies>
1.2项目相关的文件夹
说明:
- mapper文件夹:存所有的sql语句的接口
- service文件夹:存所有具体的实现的方法
- spring-mybatis文件夹:存所有整合spring和mybatis的文件
- resources文件夹存所有的资源文件
1.2.1 UserMapper.java文件
package com.nq.mapper;import org.apache.ibatis.annotations.Select;/*** @author Nickel* @version 1.0* @date 2023/7/28 0:24*/
public interface UserMapper {@Select("select 'user'")String selectById();
}
1.2.2 AppConfig.java文件
package com.nq.service;import org.springframework.context.annotation.ComponentScan;/*** @author Nickel* @version 1.0* @date 2023/7/28 14:59*/
@ComponentScan("com.nq")
public class AppConfig {
}
1.2.3 UserService.java文件
package com.nq.service;
import com.nq.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;/*** @author Nickel* @version 1.0* @date 2023/7/28 14:45*/
@Component
public class UserService {@Autowiredprivate UserMapper userMapper;public void test(){System.out.println(userMapper.selectById());}}
1.2.4 mybatis.xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration><environments default="development"><environment id="development"><!-- 使用jdbc事务管理 --><transactionManager type="JDBC"/><!-- 数据库连接池 --><dataSource type="POOLED"><property name="driver" value="com.mysql.jdbc.Driver"/><property name="url"value="jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf-8&useSSL=false"/><property name="username" value="root"/><property name="password" value="root"/></dataSource></environment></environments>
</configuration>
1.2.5 Test.java文件
package com.nq.service;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import java.io.IOException;/*** @author Nickel* @version 1.0* @date 2023/7/27 23:48*/
public class Test {public static void main(String[] args) throws IOException {AnnotationConfigApplicationContext context=new AnnotationConfigApplicationContext();context.register(AppConfig.class);context.refresh();UserService userService=(UserService)context.getBean("userService");userService.test();}
}
说明:由于UserMapper是接口类型,不能被spring加载,所以spring加载的时候这里就要解决接口不能够被加载的情况,其二;由于UserMapper是执行sql语句,所有需要Mybatis生成UserMapper代理对象注入到UserMapper类型当中。
2.手写spring-mybatis执行过程
2.1 NickelFactoryBean.java文件
package com.nq.mybatis.spring;import com.nq.mapper.UserMapper;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.stereotype.Component;import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;/*** @author Nickel* @version 1.0* @date 2023/7/28 16:00*/
@Component
public class NickelFactoryBean implements FactoryBean {@Overridepublic Object getObject() throws Exception {Object proxyInstance = Proxy.newProxyInstance(NickelFactoryBean.class.getClassLoader(), new Class[]{UserMapper.class}, new InvocationHandler() {@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {return null;}});return proxyInstance;}@Overridepublic Class<?> getObjectType() {return UserMapper.class;}
}
说明:这里让UserMapper接口成为一个bean对象,这样程序就不会报错了
说明:这里确实让UserMapper成为一个bean对象了,但是这里会有一个问题,假如我们建立一个OrderMappe文件的话,这里不能识别OrderMapper对象
2.2建立OrderMapper对象和UserService对象
1.OrderMapper.java对象
package com.nq.mapper;import org.apache.ibatis.annotations.Select;/*** @author Nickel* @version 1.0* @date 2023/7/28 0:24*/
public interface OrderMapper {@Select("select 'order'")String selectById();
}
2.UserService.java对象修改
package com.nq.service;
import com.nq.mapper.OrderMapper;
import com.nq.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;/*** @author Nickel* @version 1.0* @date 2023/7/28 14:45*/
@Component
public class UserService {@Autowiredprivate UserMapper userMapper;@Autowiredprivate OrderMapper orderMapper;public void test(){System.out.println(userMapper.selectById());System.out.println(orderMapper.selectById());}}
3.测试结果
说明:无法读取到OrderMapper对象
2.3让每一个mapper文件都成为bean对象
1.修改NickelFactoryBean.java文件,这里可以建立一个外部对象的形式,对所有的接口进行赋值
package com.nq.mybatis.spring;import com.nq.mapper.UserMapper;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.stereotype.Component;import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;/*** @author Nickel* @version 1.0* @date 2023/7/28 16:00*/
public class NickelFactoryBean implements FactoryBean {private Class mapperInterface;public NickelFactoryBean(Class mapperInterface) {this.mapperInterface = mapperInterface;}@Overridepublic Object getObject() throws Exception {Object proxyInstance = Proxy.newProxyInstance(NickelFactoryBean.class.getClassLoader(), new Class[]{mapperInterface}, new InvocationHandler() {@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {System.out.println(method.getName());return null;}});return proxyInstance;}@Overridepublic Class<?> getObjectType() {return mapperInterface;}
}
注意:这里需要去掉@Component注解,不然有这个注解spring将会加载一次,这和多个mapper去使用相违背。
2.Test方法中指定对对象成为bean对象
package com.nq.service;import com.nq.mapper.OrderMapper;
import com.nq.mapper.UserMapper;
import com.nq.mybatis.spring.NickelFactoryBean;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;import java.io.IOException;/*** @author Nickel* @version 1.0* @date 2023/7/27 23:48*/
public class Test {public static void main(String[] args) throws IOException {AnnotationConfigApplicationContext context=new AnnotationConfigApplicationContext();context.register(AppConfig.class);AbstractBeanDefinition beanDefinition= BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();beanDefinition.setBeanClass(NickelFactoryBean.class);beanDefinition.getConstructorArgumentValues().addGenericArgumentValue(UserMapper.class);//userMapper UserMapper代理对象context.registerBeanDefinition("userMapper",beanDefinition);AbstractBeanDefinition beanDefinition1= BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();beanDefinition1.setBeanClass(NickelFactoryBean.class);beanDefinition1.getConstructorArgumentValues().addGenericArgumentValue(OrderMapper.class);//orderMapper OrderMapper代理对象context.registerBeanDefinition("orderMapper",beanDefinition1);context.refresh();UserService userService=(UserService)context.getBean("userService");userService.test();}
}
3.Test结果显示
说明;这里我们把每一个mapper接口创建为bean的形式,但是这里有一个问题,假如出现第三mapper文件,我们在这里需要又去添加一个,思考这里有什么方式去注册bean呢
2.4NickelBeanDefinitionRegistryPostProcess.java文件通过继承BeanDefinitionRegistryPostProcessor去注册对应的接口
package com.nq.mybatis.spring;import com.nq.mapper.OrderMapper;
import com.nq.mapper.UserMapper;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
import org.springframework.stereotype.Component;/*** @author Nickel* @version 1.0* @date 2023/7/28 17:17*/
@Component
public class NickelBeanDefinitionRegistryPostProcess implements BeanDefinitionRegistryPostProcessor {@Overridepublic void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {AbstractBeanDefinition beanDefinition= BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();beanDefinition.setBeanClass(NickelFactoryBean.class);beanDefinition.getConstructorArgumentValues().addGenericArgumentValue(UserMapper.class);//userMapper UserMapper代理对象registry.registerBeanDefinition("userMapper",beanDefinition);AbstractBeanDefinition beanDefinition1= BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();beanDefinition1.setBeanClass(NickelFactoryBean.class);beanDefinition1.getConstructorArgumentValues().addGenericArgumentValue(OrderMapper.class);//orderMapper OrderMapper代理对象registry.registerBeanDefinition("orderMapper",beanDefinition1);}@Overridepublic void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {}
}
说明;通过这种获取方式,依然没有解决新加mapper文件的时候,需要增加修改代码的形式,所以这里我们需要通过spring扫描的方式去修改mapper文件的动态获取
2.5我们通过提供注解的形式,得到需要扫描的路径,提供NickelMapperScan注解
package com.nq.mybatis.spring;import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;/*** @author Nickel* @version 1.0* @date 2023/7/28 17:24*/
@Retention(RetentionPolicy.RUNTIME)//运行时
@Target(ElementType.TYPE)//注解只能写在类上面
public @interface NickelMapperScan {String value();
}
2.6ImportBeanDefinitionRegistrar实现接口的方式我们也能够进行注册
2.6.1修改NickelBeanDefinitionRegistryPostProcess文件
package com.nq.mybatis.spring;import com.nq.mapper.OrderMapper;
import com.nq.mapper.UserMapper;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
import org.springframework.stereotype.Component;/*** @author Nickel* @version 1.0* @date 2023/7/28 17:17*/
//@Component
public class NickelBeanDefinitionRegistryPostProcess implements BeanDefinitionRegistryPostProcessor {@Overridepublic void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
// AbstractBeanDefinition beanDefinition= BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();
// beanDefinition.setBeanClass(NickelFactoryBean.class);
// beanDefinition.getConstructorArgumentValues().addGenericArgumentValue(UserMapper.class);//userMapper UserMapper代理对象
// registry.registerBeanDefinition("userMapper",beanDefinition);
//
// AbstractBeanDefinition beanDefinition1= BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();
// beanDefinition1.setBeanClass(NickelFactoryBean.class);
// beanDefinition1.getConstructorArgumentValues().addGenericArgumentValue(OrderMapper.class);//orderMapper OrderMapper代理对象
// registry.registerBeanDefinition("orderMapper",beanDefinition1);}@Overridepublic void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {}
}
2.6.2创建NickelImportBeanDefinitionRegisty.java实现接口ImportBeanDefinitionRegistrar
package com.nq.mybatis.spring;import com.nq.mapper.OrderMapper;
import com.nq.mapper.UserMapper;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanNameGenerator;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.stereotype.Component;/*** @author Nickel* @version 1.0* @date 2023/7/28 17:32*/
public class NickelImportBeanDefinitionRegisty implements ImportBeanDefinitionRegistrar {@Overridepublic void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry, BeanNameGenerator importBeanNameGenerator) {AbstractBeanDefinition beanDefinition= BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();beanDefinition.setBeanClass(NickelFactoryBean.class);beanDefinition.getConstructorArgumentValues().addGenericArgumentValue(UserMapper.class);//userMapper UserMapper代理对象registry.registerBeanDefinition("userMapper",beanDefinition);AbstractBeanDefinition beanDefinition1= BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();beanDefinition1.setBeanClass(NickelFactoryBean.class);beanDefinition1.getConstructorArgumentValues().addGenericArgumentValue(OrderMapper.class);//orderMapper OrderMapper代理对象registry.registerBeanDefinition("orderMapper",beanDefinition1);}
}
2.6.3这里我们需要NickelImportBeanDefinitionRegisty生效,需要在AppConfig中导入
package com.nq.service;import com.nq.mybatis.spring.NickelImportBeanDefinitionRegisty;
import com.nq.mybatis.spring.NickelMapperScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Import;/*** @author Nickel* @version 1.0* @date 2023/7/28 14:59*/
@ComponentScan("com.nq")
@NickelMapperScan("com.nq.mapper")
@Import(NickelImportBeanDefinitionRegisty.class)
public class AppConfig {
}
2.6.4测试运行效果
2.7获取扫描路径
2.7.1把注解移动到扫描类上
1.修改AppConfig文件
package com.nq.service;import com.nq.mybatis.spring.NickelImportBeanDefinitionRegisty;
import com.nq.mybatis.spring.NickelMapperScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Import;/*** @author Nickel* @version 1.0* @date 2023/7/28 14:59*/
@ComponentScan("com.nq")
@NickelMapperScan("com.nq.mapper")
public class AppConfig {
}
2.修改NickelMapperScan文件
package com.nq.mybatis.spring;import org.springframework.context.annotation.Import;import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;/*** @author Nickel* @version 1.0* @date 2023/7/28 17:24*/
@Retention(RetentionPolicy.RUNTIME)//运行时
@Target(ElementType.TYPE)//注解只能写在类上面
@Import(NickelImportBeanDefinitionRegisty.class)
public @interface NickelMapperScan {String value();
}
3在NickelImportBeanDefinitionRegisty获取扫描的路径
package com.nq.mybatis.spring;import com.nq.mapper.OrderMapper;
import com.nq.mapper.UserMapper;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanNameGenerator;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.stereotype.Component;import java.util.Map;/*** @author Nickel* @version 1.0* @date 2023/7/28 17:32*/
public class NickelImportBeanDefinitionRegisty implements ImportBeanDefinitionRegistrar {@Overridepublic void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry, BeanNameGenerator importBeanNameGenerator) {//获取扫描路径Map<String, Object> annotationAttributes = importingClassMetadata.getAnnotationAttributes(NickelMapperScan.class.getName());String path = (String)annotationAttributes.get("value");System.out.println(path);AbstractBeanDefinition beanDefinition= BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();beanDefinition.setBeanClass(NickelFactoryBean.class);beanDefinition.getConstructorArgumentValues().addGenericArgumentValue(UserMapper.class);//userMapper UserMapper代理对象registry.registerBeanDefinition("userMapper",beanDefinition);AbstractBeanDefinition beanDefinition1= BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();beanDefinition1.setBeanClass(NickelFactoryBean.class);beanDefinition1.getConstructorArgumentValues().addGenericArgumentValue(OrderMapper.class);//orderMapper OrderMapper代理对象registry.registerBeanDefinition("orderMapper",beanDefinition1);}
}
说明:打印结果如下
4.通过spring的扫描逻辑获取扫描路径
1.创建类NickelClassPathBeanDefinitionScan继承spring扫描类ClassPathBeanDefinitionScanner
package com.nq.mybatis.spring;import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.annotation.ClassPathBeanDefinitionScanner;/*** @author Nickel* @version 1.0* @date 2023/7/29 14:31*/
public class NickelClassPathBeanDefinitionScan extends ClassPathBeanDefinitionScanner {public NickelClassPathBeanDefinitionScan(BeanDefinitionRegistry registry) {super(registry);}
}
2.NickelImportBeanDefinitionRegisty获取NickelClassPathBeanDefinitionScan得到扫描类
package com.nq.mybatis.spring;import com.nq.mapper.OrderMapper;
import com.nq.mapper.UserMapper;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanNameGenerator;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.stereotype.Component;import java.util.Map;/*** @author Nickel* @version 1.0* @date 2023/7/28 17:32*/
public class NickelImportBeanDefinitionRegisty implements ImportBeanDefinitionRegistrar {@Overridepublic void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry, BeanNameGenerator importBeanNameGenerator) {//获取扫描路径Map<String, Object> annotationAttributes = importingClassMetadata.getAnnotationAttributes(NickelMapperScan.class.getName());String path = (String)annotationAttributes.get("value");System.out.println(path);NickelClassPathBeanDefinitionScan nickelClassPathBeanDefinitionScan=new NickelClassPathBeanDefinitionScan(registry);nickelClassPathBeanDefinitionScan.scan(path);AbstractBeanDefinition beanDefinition= BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();beanDefinition.setBeanClass(NickelFactoryBean.class);beanDefinition.getConstructorArgumentValues().addGenericArgumentValue(UserMapper.class);//userMapper UserMapper代理对象registry.registerBeanDefinition("userMapper",beanDefinition);AbstractBeanDefinition beanDefinition1= BeanDefinitionBuilder.genericBeanDefinition().getBeanDefinition();beanDefinition1.setBeanClass(NickelFactoryBean.class);beanDefinition1.getConstructorArgumentValues().addGenericArgumentValue(OrderMapper.class);//orderMapper OrderMapper代理对象registry.registerBeanDefinition("orderMapper",beanDefinition1);}
}
说明:由于spring扫描方法只能获取扫描类,而不能获取扫描接口。
5.NickelClassPathBeanDefinitionScan通过重写isCandidateComponent方法修饰,实现只能扫描接口
package com.nq.mybatis.spring;import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
import org.springframework.beans.factory.config.BeanDefinitionHolder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.annotation.ClassPathBeanDefinitionScanner;
import org.springframework.core.type.classreading.MetadataReader;import java.io.IOException;
import java.util.Set;/*** @author Nickel* @version 1.0* @date 2023/7/29 14:31*/
public class NickelClassPathBeanDefinitionScan extends ClassPathBeanDefinitionScanner {//注册对象public NickelClassPathBeanDefinitionScan(BeanDefinitionRegistry registry) {super(registry);}/*** 获取扫描类是否有值* @param basePackages* @return*/@Overrideprotected Set<BeanDefinitionHolder> doScan(String... basePackages) {Set<BeanDefinitionHolder> beanDefinitionHolders = super.doScan(basePackages);return beanDefinitionHolders;}/*** 判断是否是接口* @param beanDefinition* @return*/@Overrideprotected boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {return beanDefinition.getMetadata().isInterface();}
}
说明:由于spring扫描只会扫描includeFilters里面的类,这里的类指的是类上面加了@Component类才会被扫描到。
6.在NickelClassPathBeanDefinitionScan时候,重写isCandidateComponent(MetadataReader metadataReader)方法,让方法都返回true
1.重写isCandidateComponent方法
package com.nq.mybatis.spring;import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
import org.springframework.beans.factory.config.BeanDefinitionHolder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.annotation.ClassPathBeanDefinitionScanner;
import org.springframework.core.type.classreading.MetadataReader;import java.io.IOException;
import java.util.Set;/*** @author Nickel* @version 1.0* @date 2023/7/29 14:31*/
public class NickelClassPathBeanDefinitionScan extends ClassPathBeanDefinitionScanner {//注册对象public NickelClassPathBeanDefinitionScan(BeanDefinitionRegistry registry) {super(registry);}/*** 获取扫描类是否有值* @param basePackages* @return*/@Overrideprotected Set<BeanDefinitionHolder> doScan(String... basePackages) {Set<BeanDefinitionHolder> beanDefinitionHolders = super.doScan(basePackages);return beanDefinitionHolders;}/*** 判断是否是接口* @param beanDefinition* @return*/@Overrideprotected boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {return beanDefinition.getMetadata().isInterface();}/*** 重新是否包含的接口* @param metadataReader* @return* @throws IOException*/@Overrideprotected boolean isCandidateComponent(MetadataReader metadataReader) throws IOException {return true;}
}
2.修改NickelImportBeanDefinitionRegisty方法
package com.nq.mybatis.spring;import com.nq.mapper.OrderMapper;
import com.nq.mapper.UserMapper;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanNameGenerator;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.core.type.filter.TypeFilter;
import org.springframework.stereotype.Component;import java.io.IOException;
import java.util.Map;/*** @author Nickel* @version 1.0* @date 2023/7/28 17:32*/
public class NickelImportBeanDefinitionRegisty implements ImportBeanDefinitionRegistrar {@Overridepublic void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry, BeanNameGenerator importBeanNameGenerator) {//获取扫描路径Map<String, Object> annotationAttributes = importingClassMetadata.getAnnotationAttributes(NickelMapperScan.class.getName());String path = (String)annotationAttributes.get("value");System.out.println(path);NickelClassPathBeanDefinitionScan scanner=new NickelClassPathBeanDefinitionScan(registry);scanner.scan(path);}
}
3.修改NickelClassPathBeanDefinitionScan让方法的类都属于NickelFactoryBean对象
package com.nq.mybatis.spring;import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanDefinitionHolder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.annotation.ClassPathBeanDefinitionScanner;
import org.springframework.core.type.classreading.MetadataReader;import java.io.IOException;
import java.util.Set;/*** @author Nickel* @version 1.0* @date 2023/7/29 14:31*/
public class NickelClassPathBeanDefinitionScan extends ClassPathBeanDefinitionScanner {//注册对象public NickelClassPathBeanDefinitionScan(BeanDefinitionRegistry registry) {super(registry);}/*** 获取扫描类是否有值* @param basePackages* @return*/@Overrideprotected Set<BeanDefinitionHolder> doScan(String... basePackages) {Set<BeanDefinitionHolder> beanDefinitionHolders = super.doScan(basePackages);for (BeanDefinitionHolder beanDefinitionHolder : beanDefinitionHolders) {BeanDefinition beanDefinition = beanDefinitionHolder.getBeanDefinition();beanDefinition.getConstructorArgumentValues().addGenericArgumentValue(beanDefinition.getBeanClassName());beanDefinition.setBeanClassName(NickelFactoryBean.class.getName());}return beanDefinitionHolders;}/*** 判断是否是接口* @param beanDefinition* @return*/@Overrideprotected boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {return beanDefinition.getMetadata().isInterface();}/*** 重新是否包含的接口* @param metadataReader* @return* @throws IOException*/@Overrideprotected boolean isCandidateComponent(MetadataReader metadataReader) throws IOException {return true;}
}
4.增加MemberMapper.java接口
package com.nq.mapper;import org.apache.ibatis.annotations.Select;/*** @author Nickel* @version 1.0* @date 2023/7/28 0:24*/
public interface MemberMapper {@Select("select 'user'")String selectById();
}
5.修改UserService.java
package com.nq.service;
import com.nq.mapper.MemberMapper;
import com.nq.mapper.OrderMapper;
import com.nq.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;/*** @author Nickel* @version 1.0* @date 2023/7/28 14:45*/
@Component
public class UserService {@Autowiredprivate UserMapper userMapper;@Autowiredprivate OrderMapper orderMapper;@Autowiredprivate MemberMapper memberMapper;public void test(){System.out.println(userMapper.selectById());System.out.println(orderMapper.selectById());System.out.println(memberMapper.selectById());}}
6.打印结果显示
结果显示
7.修改NickelFactoryBean代理,使得代理对象为mybatis
1.修改NickelFactoryBean对象
package com.nq.mybatis.spring;import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.annotation.Autowired;import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;/*** @author Nickel* @version 1.0* @date 2023/7/28 16:00*/
public class NickelFactoryBean implements FactoryBean {private Class mapperInterface;private SqlSession sqlSession;public NickelFactoryBean(Class mapperInterface) {this.mapperInterface = mapperInterface;}@Autowiredpublic void setSqlSession(SqlSessionFactory sqlSessionFactory) {sqlSessionFactory.getConfiguration().addMapper(mapperInterface);this.sqlSession = sqlSessionFactory.openSession();}@Overridepublic Object getObject() throws Exception {return sqlSession.getMapper(mapperInterface);}@Overridepublic Class<?> getObjectType() {return mapperInterface;}
}
2.修改AppConfig配置启动类
package com.nq.service;import com.nq.mybatis.spring.NickelImportBeanDefinitionRegisty;
import com.nq.mybatis.spring.NickelMapperScan;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Import;import java.io.IOException;
import java.io.InputStream;/*** @author Nickel* @version 1.0* @date 2023/7/28 14:59*/
@ComponentScan("com.nq")
@NickelMapperScan("com.nq.mapper")
public class AppConfig {@Beanpublic SqlSessionFactory sqlSessionFactory() throws IOException {InputStream inputStream = Resources.getResourceAsStream("mybatis.xml");SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);return sqlSessionFactory;}
}
代码路径:
https://gitee.com/nickel369369/spring-mybatis/mirrors#/