这篇文章主要介绍了怎么在Netty中注解使用Service或者Mapper,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。
SpringBoot搭配Netty使用,在Handler中注解使用Service/Mapper 一直 为null。起初使用 SpringBoot启动类继承ApplicationContextAware,再写一个静态方法获取Bean来解决。
放在服务器上跑了几个小时就出现了问题,好像是该方案造成的。
另辟蹊径,再看网上给出的答案,因为 Handler 是 new出来的,不被Spring管理,所以注解根本就没有什么作用。
思前想后,(有BUG,下文修正解决:觉得可以给Handler添加@Component 注解交给Spring 管理,再通过构造方法把 Handler 传递给Server。结构代码):
@Component
public class OBDHandler extends ChannelInboundHandlerAdapter {
private final Logger logger = LoggerFactory.getLogger(getClass());
@Autowired
private OBDMapper mOBDMapper;
}
public class OBDServer {
private Logger log = LoggerFactory.getLogger(getClass());
private OBDHandler obdHandler;
private int port;
public OBDServer(int port,OBDHandler obdHandler) {
this.port = port;
this.obdHandler = obdHandler;
}
private void bind() throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.group(group)//
.channel(NioServerSocketChannel.class) //
.childHandler(new ChannelInitializer<SocketChannel>() { //
@Override
public void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(new LengthFieldBasedFrameDecoder(1024*1024,0,4));
ch.pipeline().addLast(obdHandler);
}
});
}
}
@Configuration
public class NettyConfig {
@Autowired
private OBDHandler obdHandler;
@Bean
public OBDServer obdServer(){
OBDServer obdServer = new OBDServer(7788,obdHandler);
obdServer.startServer();
return obdServer;
}
}
并发需要创建多个Handler,而被Spring托管的单例Handler会造成以下错误:
is not a @Sharable handler, so can't be added or removed multiple times.
最终通过在Server中注入 Service/Mapper,再通过Handler构造传递:
public class OBDServer {
@Autowired
private OBDMapper mOBDMapper;
public OBDServer(int port) {
this.port = port;
}
private void bind() throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.group(group)//
.channel(NioServerSocketChannel.class) //
.childHandler(new ChannelInitializer<SocketChannel>() { //
@Override
public void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(new LengthFieldBasedFrameDecoder(1024*1024,0,4));
ch.pipeline().addLast(new OBDHandler(mOBDMapper));
}
});
}
}
@Slf4j
@Component
public class BootNettyChannelInboundHandlerAdapter extends ChannelInboundHandlerAdapter {
public static BootNettyChannelInboundHandlerAdapter
bootNettyChannelInboundHandlerAdapter;
//1.正常注入[记得主类也需要使用@Component注解]
@Autowired
private DeviceUpService deviceUpService;
//2.初始化构造方法一定要有
public BootNettyChannelInboundHandlerAdapter() {
}
//3.容器初始化的时候进行执行-这里是重点
@PostConstruct
public void init() {
bootNettyChannelInboundHandlerAdapter = this;
bootNettyChannelInboundHandlerAdapter.deviceUpService = this.deviceUpService;
}
}
完成以上步骤后通过
bootNettyChannelInboundHandlerAdapter.deviceUpService
调用service类即可
感谢你能够认真阅读完这篇文章,希望小编分享的“怎么在Netty中注解使用Service或者Mapper”这篇文章对大家有帮助,同时也希望大家多多支持亿速云,关注亿速云行业资讯频道,更多相关知识等着你来学习!
亿速云「云服务器」,即开即用、新一代英特尔至强铂金CPU、三副本存储NVMe SSD云盘,价格低至29元/月。点击查看>>
免责声明:本站发布的内容(图片、视频和文字)以原创、转载和分享为主,文章观点不代表本网站立场,如果涉及侵权请联系站长邮箱:is@yisu.com进行举报,并提供相关证据,一经查实,将立刻删除涉嫌侵权内容。