springboot使用netty实现服务器之间推送消息的代码
时间: 2023-10-22 16:15:01 浏览: 64
下面是一个使用Spring Boot和Netty实现服务器之间推送消息的简单示例代码:
首先,需要引入Netty和Spring Boot的依赖:
```xml
<!-- Netty -->
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.1.42.Final</version>
</dependency>
<!-- Spring Boot -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
```
接下来,定义一个WebSocket服务器处理程序:
```java
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
public class WebSocketServerHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {
private static ChannelGroup channels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
Channel incoming = ctx.channel();
channels.add(incoming);
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
Channel incoming = ctx.channel();
channels.remove(incoming);
}
@Override
protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {
// 收到消息后,将消息转发给所有连接的客户端
for (Channel channel : channels) {
if (channel != ctx.channel()) {
channel.writeAndFlush(new TextWebSocketFrame(msg.text()));
}
}
}
}
```
然后,在Spring Boot应用程序中定义WebSocket服务器:
```java
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;
@Configuration
public class WebSocketServerConfig {
@Autowired
private WebSocketServerHandler webSocketServerHandler;
@Autowired
private ServerEndpointExporter serverEndpointExporter;
public void init() throws Exception {
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap bootstrap = new ServerBootstrap();
bootstrap.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
pipeline.addLast(new HttpServerCodec());
pipeline.addLast(new HttpObjectAggregator(65536));
pipeline.addLast(new WebSocketServerProtocolHandler("/ws"));
pipeline.addLast(webSocketServerHandler);
}
});
ChannelFuture future = bootstrap.bind(8080).sync();
future.channel().closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
```
最后,在Spring Boot应用程序的启动类中调用WebSocket服务器初始化方法:
```java
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class MyApplication {
@Bean
public WebSocketServerHandler webSocketServerHandler() {
return new WebSocketServerHandler();
}
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
public static void main(String[] args) {
SpringApplication.run(MyApplication.class, args);
WebSocketServerConfig webSocketServer = new WebSocketServerConfig();
try {
webSocketServer.init();
} catch (Exception e) {
e.printStackTrace();
}
}
}
```
这样,就可以使用Netty和Spring Boot实现服务器之间的消息推送了。
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