最近在做一个服务器接收客户端消息,之前一直都只接触web开发,第一次接触服务器开发,接触到Netty,但在Netty的Handler类里注入为null。
public class HttpRequestHandler extends SimpleChannelInboundHandler<FullHttpRequest> {
@Autowired
private UserRepository userRepository;
....
}
userRepository注入后为nul,在上寻求了多种方法,参考了一些大神的博文,Spring Boot非controller使用@Autowired注解注入为null的问题(加@Component注解,再写个初始化函数),依旧无效。
最后,参考https://www.cnblogs.com/s648667069/p/6489557.html的方法
写了个SpringUtil工具类,代码如下:
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
@Component
public class SpringUtil implements ApplicationContextAware {
private static ApplicationContext applicationContext;
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
if(SpringUtil.applicationContext == null) {
SpringUtil.applicationContext = applicationContext;
}
}
//获取applicationContext
public static ApplicationContext getApplicationContext() {
return applicationContext;
}
//通过name获取 Bean.
public static Object getBean(String name){
return getApplicationContext().getBean(name);
}
//通过class获取Bean.
public static <T> T getBean(Class<T> clazz){
return getApplicationContext().getBean(clazz);
}
//通过name,以及Clazz返回指定的Bean
public static <T> T getBean(String name,Class<T> clazz){
return getApplicationContext().getBean(name, clazz);
}
}
- 改为:
public class HttpRequestHandler extends SimpleChannelInboundHandler<FullHttpRequest> {
private static UserRepository userRepository;
static {
userRepository = SpringUtil.getBean(UserRepository.class);
}
...
}