spring boot 读取.yml失败

Question

1、application.yml spring: profiles: active: dev datasource: url: jdbc:mysql://192.168.2.201:3306/pmsd?useUnicode=true&characterEncoding=utf8&ssl=false username: app_pmsd password: 635151_Itp driver-class-name: com.mysql.jdbc.Driver druid: initial-size: 1 minIdle: 5 maxActive: 20 timeBetweenEvictionRunsMillis: 60000 minEvictableIdleTimeMillis: 300000 2、DataSourceProperties.java @Component @ConfigurationProperties(prefix = "spring.datasource") public class DataSourceProperties { private String url; public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } } 3、MybatisConfigurer.java @Configuration public class MybatisConfigurer { @Autowired private DataSourceProperties dataSourceProperties; @Bean(name = "dataSource") public DataSource dataSource() { DruidDataSource druidDataSource = new DruidDataSource(); druidDataSource.setUrl(dataSourceProperties.getUrl()); //druidDataSource.setUsername(dataSourceProperties.getUserName()); //druidDataSource.setPassword(dataSourceProperties.getPassWord()); //druidDataSource.setDriverClassName(dataSourceProperties.getDriverClassName()); return druidDataSource; } } 4、pom.xml有引用 <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-configuration-processor</artifactId> <optional>true</optional> </dependency> 代码如上，我在获取dataSourceProperties得到的是null，请问各位大神是哪里写的不对呢？谢谢

Answer 1

已经解决。原因是我在MybatisConfigurer类中还有另外一个方法MapperScannerConfigurer造成的，因为spring会首先执行MapperScannerConfigurer方法，在执行的时候还没有创建sqlsessionFactory，所以就会造成空指针异常

Answer 2

DataSourceProperties 里加入代码

 public DataSource config(DruidDataSource dataSource){
        dataSource.setUrl(url);
        return dataSource;
 }

MybatisConfigurer里修改为

    @Bean
    public DruidDataSource dataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        druidProperties.config(dataSource);
        return dataSource;
    }