Mybatis 自定义SqlSessionFactoryBean扫描通配符typeAliasesPackage

最新推荐文章于 2023-11-06 13:25:14 发布

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最新推荐文章于 2023-11-06 13:25:14 发布

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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>