自定义组件

1. 使用自定义注册，@import的方式进行实例化

@Target({ElementType.METHOD, ElementType.TYPE})

@Retention(RetentionPolicy.RUNTIME)

@Documented

@Inherited

@Import({xxxConfiguration.class,yyyConfiguration.class})

• 新建注解类 public @interface EnableResource{}

• 目录结构

src

main

anno

EnableResource

config

xxxConfiguration

@Configuration
@ConditionOnProperty(value='policy.type',havingValue='标识')
@MapperScan(basePackages = 'com.xg.mapper' ,sqlSessionFactoryRef = 'mysqlSqlSessionFactory')
public class xxxConfiguration{
    @Value("$(param.jdbc.url)") //调用方的配置文件中
    private String jdbcUrl
    @Bean
    public xxxService xxxServiceBean(){
        return new xxxServiceImpl();
    }
    @Bean(name="mysqlDataSource")
    public DataSource mysqlDataSource(String jdbcUrl){
       HikariConfig hikariConfig = new HikariConfig();
       hikariConfig.setJdbcUrl(jdbcUrl)
       hikariConfig....
       return new new HikariDataSource(hikariConfig);
    }

    @Primary
    @Bean(name = "mysqlSqlSessionFactory")
    public SqlSessionFactory mysqlSqlSessionFactory(@Qualifier("mysqlDataSource")  DataSource datasource) throw Exception{
      MybatisSqlSessionFactoryBean factoryBean = MybatisSqlSessionFactoryBean();
      MybatisConfiguration config = new MybatisConfiguration();
      config.addInterceptor(new PaginationInterceptor());
      factoryBean.setConfiguration(config);
      factoryBean.setDataSource(datasource);
factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(classpath:mapper/*.xml));
return factoryBean.getObject();
    }
}

entity

mapper

service

impl

resources

mapper

xxx.xml

调用方：在启动类上添加 引入Enable的注解

2. 使用spring.factories的方式进行实例化