Question

我在这里有两个配置：

let date = this.Model.year + '-' + this.Model.month + '-' + this.Model.day

----------另一个配置-------------

@Configuration
public class DataConfig {

@Value("${datasource.jdbcUrl}")
private String jdbcUrl;
@Value("${datasource.username}")
private String username;
@Value("${datasource.password}")
private String password;
@Value("${datasource.driverClassName:com.mysql.jdbc.Driver}")
private String driverClassName;
@Value("${datasource.initialSize:20}")
private int initialSize;
@Value("${datasource.maxActive:30}")
private int maxActive;
@Value("${datasource.minIdle:20}")
private int minIdle;
@Value("${datasource.transactionTimeoutS:30}")
private int transactionTimeoutS;

@Value("${datasource.basePackage:com.tg.ms.mapper}")
private String basePackage;
@Value("${datasource.mapperLocations}")
private String mapperLocations;


@Bean
public DataSource dataSource() {
    DruidDataSource ds = new DruidDataSource();
    ds.setMaxWait(maxWait);
    ds.setValidationQuery(validationQuery);
    ds.setRemoveAbandoned(removeAbandoned);
    ds.setRemoveAbandonedTimeout(removeAbandonedTimeout);
    ds.setTestWhileIdle(testWhileIdle);
    ds.setTestOnReturn(testOnReturn);
    ds.setTestOnBorrow(testOnBorrow);
    ds.setMinIdle(minIdle);
    return ds;
}


@Bean
public SqlSessionFactory sqlSessionFactoryBean() throws Exception {

    SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
    sqlSessionFactoryBean.setDataSource(dataSource());

    PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();

    sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:/mybatis/*.xml"));

    return sqlSessionFactoryBean.getObject();
}

我可以将@Configuration @AutoConfigureAfter(DataBaseConfig.class) public class MapperScannerConfig { @Value("${datasource.basePackage:com.tg.ms.mapper}") private String basePackage; @Bean public MapperScannerConfigurer BPMapperScannerConfigurer() { System.out.println("mapper--1.----******----"+basePackage+"----*******"); MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer(); mapperScannerConfigurer.setBasePackage("com.tg.mapper"); mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactoryBean"); return mapperScannerConfigurer; } }加入@Bean public MapperScannerConfigurer BPMapperScannerConfigurer()吗？我试着打印：

DataConfig
Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'testController': Unsatisfied dependency expressed through field 'testMapper'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testMapper' defined in file [/Users/twogoods/codesource/mainetset/target/classes/com/tg/mapper/TestMapper.class]: Cannot resolve reference to bean 'sqlSessionFactoryBean' while setting bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactoryBean' defined in class path resource [com/tg/config/DataConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactoryBean' threw exception; nested exception is java.lang.NullPointerException init早于MapperScannerConfig，我从打印日志中获取，DataConfig无法获取值（@Value("${datasource.basePackage:com.tg.ms.mapper}") private String basePackage;可以获得），我使用{ {1}}没用，DataConfig也是预告片，我无法配置mapper basePackage

日志：@AutoConfigureAfter

Answer 1

我遇到了同样的问题。 MapperScannerConfigurer在spring框架中过早地初始化，我认为它会导致注释@AutoConfigureAfter变得无用。所以我解决它：避免使用MapperScannerConfigurer：两种方式：

只需使用@MapperScan（“com.a.b.package”）
在mybatis映射器界面中使用注释@ org.apache.ibatis.annotations.Mapper。

如何在springboot中配置mybatis

1 个答案: