spring boot 静态变量注入配置文件

时间:2023-03-08 17:37:26
spring boot 静态变量注入配置文件

spring 静态变量注入

spring 中不支持直接进行静态变量值的注入,我们看一下代码:

@Component(value = "KafkaConfig")
@ConfigurationProperties(prefix = "baseConfig")
public class KafkaConfig {
private static String logBrokerList; public static String getLogBrokerList() {
return logBrokerList;
} public static void setLogBrokerList(String logBrokerList) {
KafkaConfig.logBrokerList = logBrokerList;
}
}

配置文件如下:

baseConfig:
logBrokerList: 10.10.2.154:9092
logTopic: test
monitorTopic: monitor

项目启动时使用 logBrokerList变量

@SpringBootApplication
public class Application {
public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class, args);
System.out.println("config static test :" + KafkaConfig.getLogBrokerList());
}
}

执行结果:config static test :null


解决办法

利用spring的set注入方法,通过非静态的setter方法注入静态变量 
,我们可以改成这样就静态变量可以获取到你配置的信息了:

@Component(value = "KafkaConfig")
@ConfigurationProperties(prefix = "baseConfig")
public class KafkaConfig {
private static String logBrokerList; public static String getLogBrokerList() {
return logBrokerList;
}
@Value("${baseConfig.logBrokerList}")
public void setLogBrokerList(String logBrokerList) {
KafkaConfig.logBrokerList = logBrokerList;
}
}

执行结果:config static test :10.10.2.154:9092