Spring Boot集成MyBatis打包成jar时，setTypeAliasesPackage("xxx")找不到类的问题

MyBatis扫描通过VFS来实现

在Spring Boot中，由于是嵌套Jar，导致Mybatis默认的VFS实现DefaultVFS无法扫描嵌套Jar中的类。

解决办法，实现自定义的VFS，参考DefaultVFS增加对Spring Boot嵌套JAR的处理。

以下为SpringBootVFS

import java.io.IOException;
import java.net.URI;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.ibatis.io.VFS;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

/**
 * Spring Boot集成MyBatis打包成jar时，找不到类的问题
 * @author yuejing
 */
public class SpringBootVFS extends VFS {

    @Override
    public boolean isValid() {
        return true;
    }

    @Override
    protected List<String> list(URL url, String path) throws IOException {
        ClassLoader cl = this.getClass().getClassLoader();
        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(cl);
        Resource[] resources = resolver.getResources(path + "/**/*.class");
        List<Resource> resources1 = Arrays.asList(resources);
        List<String> resourcePaths = new ArrayList<String>();
        for (Resource resource: resources1) {
            resourcePaths.add(preserveSubpackageName(resource.getURI(), path));
        }
        return resourcePaths;
    }

    private static String preserveSubpackageName(final URI uri, final String rootPath) {
        final String uriStr = uri.toString();
        final int start = uriStr.indexOf(rootPath);
        return uriStr.substring(start, uriStr.length());
    }

}

在创建sqlSessionFactoryBean时加入VFS的使用

@Bean(name = "sqlSessionFactory")
	public SqlSessionFactory sqlSessionFactory(DynamicDataSource ds) throws Exception {
		//解决myBatis下 不能嵌套jar文件的问题
    		VFS.addImplClass(SpringBootVFS.class);

		SqlSessionFactoryBean fb = new SqlSessionFactoryBean();
		// 指定数据源(这个必须有，否则报错)
		fb.setDataSource(ds);
		String typeAliasesPackage = "com.frame.sys.pojo;"
				+ "com.frame.user.pojo;"
				+ "com.frame.dep.pojo;"
				+ "com.bps.crm.pojo";
		fb.setTypeAliasesPackage(typeAliasesPackage);
		
		List<Resource> resources = new ArrayList<Resource>();
		resources.addAll(Arrays.asList(new PathMatchingResourcePatternResolver()
		.getResources("classpath*:com/frame/sys/dao/oracle/*.xml")));
		resources.addAll(Arrays.asList(new PathMatchingResourcePatternResolver()
		.getResources("classpath*:com/frame/user/dao/oracle/*.xml")));
		Resource configLocation = new PathMatchingResourcePatternResolver().getResource("classpath:mybatis-config.xml");
		fb.setConfigLocation(configLocation);
		return fb.getObject();
	}

至此该问题已经解决，启动测试下吧。