本篇内容主要讲解“Springboot+Mybatis中怎么实现typeAliasesPackage正则扫描”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“Springboot+Mybatis中怎么实现typeAliasesPackage正则扫描”吧!
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mybatis默认配置typeAliasesPackage是不支持正则扫描package的，因此需要手动继承org.mybatis.spring.SqlSessionFactoryBean，自己实现正则扫描，方法和传统的spring+mybatis没什么区别，不同的是一个需要继承类一个是使用的扫描实现。
对于两个或多个扫描路径，例：
cn.com.onethird.integration.entity
cn.com.onethird.business.entity
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实现正则扫描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 result = new ArrayList();
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 h = new HashSet(result);
result.clear();
result.addAll(h);
typeAliasesPackage = String.join("," ,(String[]) result.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 {
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");
}
} 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 result = new ArrayList();
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();
}
}
} 
