Mybatis 自定义SqlSessionFactoryBean扫描通配符typeAliasesPackage

本文介绍了一种扩展MyBatis的typeAliasesPackage配置的方法,通过重写SqlSessionFactoryBean来支持通配符扫描,实现了更灵活的类型别名设置。

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typeAliasesPackage 默认只能扫描某一个路径下,或以逗号等分割的 几个路径下的内容,不支持通配符和正则,采用重写的方式解决

package com.xxxx.xxx.util.common;  
  
import com.xxxx.xxx.util.LogUtil;  
import org.apache.commons.lang3.StringUtils;  
import org.mybatis.spring.SqlSessionFactoryBean;  
import org.slf4j.Logger;  
import org.springframework.core.io.Resource;  
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;  
import org.springframework.core.io.support.ResourcePatternResolver;  
import org.springframework.core.type.classreading.CachingMetadataReaderFactory;  
import org.springframework.core.type.classreading.MetadataReader;  
import org.springframework.core.type.classreading.MetadataReaderFactory;  
import org.springframework.util.ClassUtils;  
  
import java.io.IOException;  
import java.util.ArrayList;  
import java.util.List;  
  
/** 
 * Created by Administrator on 2015/10/6. 
 */  
public class PackagesSqlSessionFactoryBean extends SqlSessionFactoryBean {  
  
    static final String DEFAULT_RESOURCE_PATTERN = "**/*.class";  
  
    private static Logger logger = LogUtil.get();  
  
    @Override  
    public void setTypeAliasesPackage(String typeAliasesPackage) {  
        ResourcePatternResolver resolver = (ResourcePatternResolver) new PathMatchingResourcePatternResolver();  
        MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(resolver);  
        typeAliasesPackage = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX +  
                ClassUtils.convertClassNameToResourcePath(typeAliasesPackage) + "/" + DEFAULT_RESOURCE_PATTERN;  
  
        //将加载多个绝对匹配的所有Resource  
        //将首先通过ClassLoader.getResource("META-INF")加载非模式路径部分  
        //然后进行遍历模式匹配  
        try {  
            List<String> result = new ArrayList<String>();  
            Resource[] resources =  resolver.getResources(typeAliasesPackage);  
            if(resources != null && resources.length > 0){  
                MetadataReader metadataReader = null;  
                for(Resource resource : resources){  
                    if(resource.isReadable()){  
                       metadataReader =  metadataReaderFactory.getMetadataReader(resource);  
                        try {  
                            result.add(Class.forName(metadataReader.getClassMetadata().getClassName()).getPackage().getName());  
                        } catch (ClassNotFoundException e) {  
                            e.printStackTrace();  
                        }  
                    }  
                }  
            }  
            if(result.size() > 0) {  
                super.setTypeAliasesPackage(StringUtils.join(result.toArray(), ","));  
            }else{  
                logger.warn("参数typeAliasesPackage:"+typeAliasesPackage+",未找到任何包");  
            }  
            //logger.info("d");  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }  
  
}  

然后在mybatis的配置文件中修改

<bean id="sqlSession" class="com.xxxx.xxxx.util.common.PackagesSqlSessionFactoryBean">  
        <property name="configLocation" value="classpath:config/sqlmap/sqlmap-config.xml" />  
        <property name="dataSource" ref="dataSource"/>  
        <!--<property name="mapperLocations"-->  
                  <!--value="classpath*:com/xxxx/xxxx/merchant/**/domain/mapper/*.xml"/>-->  
        <property name="typeAliasesPackage" value="com.xxxx.xxxx.custom.*.domain"/>  
        <property name="plugins">  
            <array>  
                <ref bean="pageInterceptor"/>  
            </array>  
        </property>  
    </bean>  
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">  
        <property name="basePackage" value="com.xxxx.xxxx.**.dao"/>  
    </bean>  


@Configuration public class MyBatisConfig { @Autowired private Environment env; static final String DEFAULT_RESOURCE_PATTERN = "**/*.class"; public static String setTypeAliasesPackage(String typeAliasesPackage) { ResourcePatternResolver resolver = (ResourcePatternResolver) new PathMatchingResourcePatternResolver(); MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(resolver); List<String> allResult = new ArrayList<String>(); try { for (String aliasesPackage : typeAliasesPackage.split(",")) { List<String> result = new ArrayList<String>(); aliasesPackage = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + ClassUtils.convertClassNameToResourcePath(aliasesPackage.trim()) + "/" + DEFAULT_RESOURCE_PATTERN; Resource[] resources = resolver.getResources(aliasesPackage); if (resources != null && resources.length > 0) { MetadataReader metadataReader = null; for (Resource resource : resources) { if (resource.isReadable()) { metadataReader = metadataReaderFactory.getMetadataReader(resource); try { result.add(Class.forName(metadataReader.getClassMetadata().getClassName()).getPackage().getName()); } catch (ClassNotFoundException e) { e.printStackTrace(); } } } } if (result.size() > 0) { HashSet<String> hashResult = new HashSet<String>(result); allResult.addAll(hashResult); } } if (allResult.size() > 0) { typeAliasesPackage = String.join(",", (String[]) allResult.toArray(new String[0])); } else { throw new RuntimeException("mybatis typeAliasesPackage 路径扫描错误,参数typeAliasesPackage:" + typeAliasesPackage + "未找到任何包"); } } catch (IOException e) { e.printStackTrace(); } return typeAliasesPackage; } @Bean public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception { String typeAliasesPackage = env.getProperty("mybatis.typeAliasesPackage"); String mapperLocations = env.getProperty("mybatis.mapperLocations"); String configLocation = env.getProperty("mybatis.configLocation"); typeAliasesPackage = setTypeAliasesPackage(typeAliasesPackage); VFS.addImplClass(SpringBootVFS.class); final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean(); sessionFactory.setDataSource(dataSource); sessionFactory.setTypeAliasesPackage(typeAliasesPackage); sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations)); sessionFactory.setConfigLocation(new DefaultResourceLoader().getResource(configLocation)); return sessionFactory.getObject(); } }
最新发布
04-01
在Spring Boot项目中,如果你想将mybatisSqlSessionFactoryBean替换为mybatis-plus的MybatisSqlSessionFactoryBean,你需要做以下几个步骤: 1. 添加依赖:首先在你的pom.xml或build.gradle文件中添加mybatis-plus的依赖,例如对于Maven: ```xml <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>版本号</version> <!-- 更新到最新的mybatis-plus版本 --> </dependency> ``` 或者Gradle: ```groovy implementation 'com.baomidou:mybatis-plus-boot-starter:版本号' ``` 2. 替换配置:删除原有的`SqlSessionFactoryBean`配置,并添加`MybatisPlusSqlSessionFactoryBean`。在Spring的配置文件如application.yml或application.properties中,找到mybatis相关的配置部分,然后替换为mybatis-plus的配置: ```yaml # mybatis相关配置 spring.datasource.type=com.alibaba.druid.DruidDataSource mybatis_plus: configuration: db_config: type: MYSQL global-config: lazy-load-proxy: true db-type: mysql mapperLocations: classpath*:mapper/*.xml sqlSessionFactory: mybatisPlusSqlSessionFactory ``` 3. 配置数据源:mybatis-plus需要一个Druid或Spring的DataSource。如果已存在DataSources,确保它与mybatis-plus关联。 4. 注解支持:mybatis-plus通常会自动扫描带有@Mapper、@Table等注解的接口和实体类,无需手动注册。 5. 实体类和映射:确保你的实体类遵循mybatis-plus的命名规则,并提供相应的字段名和类型的映射。 6. 测试整合:最后,重启应用并测试数据库操作,确认Mybatis-Plus是否正常工作。
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