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Springboot+Mybatis中typeAliasesPackage正則掃描實現(xiàn)方式

更新時間：2021年07月13日 10:47:31 作者：楊仙僧

這篇文章主要介紹了Springboot+Mybatis中typeAliasesPackage正則掃描實現(xiàn)方式，具有很好的參考價值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教

Mybatis typeAliasesPackage正則掃描

mybatis默認配置typeAliasesPackage是不支持正則掃描package的，因此需要手動繼承org.mybatis.spring.SqlSessionFactoryBean，自己實現(xiàn)正則掃描，方法和傳統(tǒng)的spring+mybatis沒什么區(qū)別，不同的是一個需要繼承類一個是使用的掃描實現(xiàn)。

對于兩個或多個掃描路徑，例：

cn.com.onethird.integration.entity

cn.com.onethird.business.entity

application.properties配置Mybatis 如下

mybatis.typeAliasesPackage=cn.com.onethird.*.*.entity
mybatis.mapperLocations=classpath:mapper/*.xml

package cn.com.onethird.nursinghome; 
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Properties; 
import javax.sql.DataSource;
 
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
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 com.Application;
 
/** 
 * 
 * @Title: MyBatisConfig.java * 
 * @Package 
 * @Description: mybtis實現(xiàn)正則掃描java bean包 * 
 * @author 
 * @date 
 * @version V1.0 
 */
 
@Configuration
@PropertySource("classpath:application.properties")
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);
        typeAliasesPackage = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX
                + ClassUtils.convertClassNameToResourcePath(typeAliasesPackage)
                + "/" + DEFAULT_RESOURCE_PATTERN;
        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) {
                HashSet<String> h = new HashSet<String>(result);
                result.clear();
                result.addAll(h);
                typeAliasesPackage = String.join("," ,(String[]) result.toArray(new String[0]));
            } else {
                throw new RuntimeException(
                        "mybatis typeAliasesPackage 路徑掃描錯誤, 參數(shù)typeAliasesPackage:" + typeAliasesPackage + "未找到任何包");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return typeAliasesPackage;
    }
 
    @Bean
    public SqlSessionFactory sqlSessionFactory(DataSource dataSource)
            throws Exception {
        System.out.println(">>>>>>>>>>>配置[typeAliasesPackage,mapperLocations]START>>>>>>>>>>>>>>");
        Properties props = new Properties();
        String typeAliasesPackage = env
                .getProperty("mybatis.typeAliasesPackage");
        String mapperLocations = env.getProperty("mybatis.mapperLocations");
        typeAliasesPackage=setTypeAliasesPackage(typeAliasesPackage);
 
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        sessionFactory.setTypeAliasesPackage(typeAliasesPackage);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations));
        System.out.println(">>>>>>>>>>>配置[typeAliasesPackage,mapperLocations]END>>>>>>>>>>>>>>");
        return sessionFactory.getObject();
    }
 
    public static void main(String[] args) throws Exception {
        setTypeAliasesPackage("cn.com.onethird.*.*.entity");
    }
}

Mybatis 自定義掃描通配符typeAliasesPackage

typeAliasesPackage 默認只能掃描某一個路徑下，或以逗號等分割的幾個路徑下的內(nèi)容，不支持通配符和正則，采用重寫的方式解決

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;  
  
        //將加載多個絕對匹配的所有Resource  
        //將首先通過ClassLoader.getResource("META-INF")加載非模式路徑部分  
        //然后進行遍歷模式匹配  
        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("參數(shù)typeAliasesPackage:"+typeAliasesPackage+"，未找到任何包");  
            }  
            //logger.info("d");  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }    
}

<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>

以上為個人經(jīng)驗，希望能給大家一個參考，也希望大家多多支持腳本之家。

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