使用SpringBoot 脚手架搭建的一个简单的 web demo ，开启了属性自动注入，配置文件如下：
@Setter
@Getter
@Configuration
@ConfigurationProperties(prefix = "com.ff")
@EnableConfigurationProperties(FFProperties.class)
public class FFProperties {
private String database;
}
@Component
public class LocalDataBase {
private final FFProperties properties;
public LocalDataBase(FFProperties properties) {
this.properties = properties;
}
}
启动服务失败，根据错误信息很明显可以判断出是Spring容器有两个实例，不知道要注入哪个
***************************
APPLICATION FAILED TO START
***************************
Description:
Parameter 0 of constructor in com.hoperun.database.LocalDataBase required a single bean, but 2 were found:
- ffProperties: defined in file [D:\workspace\demo\target\classes\com\ff\properties\FFProperties.class]
- com.ff-com.ff.properties.FFProperties: defined in null
Action:
Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed
Process finished with exit code 0
这里配置有个坑，需要注意下，如果注解在配置类的头上，则不要再写上类本身了, 按下面的修改，即可正常运行了
@Setter
@Getter
@Configuration
@ConfigurationProperties(prefix = "com.ff")
@EnableConfigurationProperties
public class FFProperties {
private String database;
}