用代码来实现上面每个步骤
时间: 2024-04-10 16:27:51 浏览: 18
以下是一个简单的示例代码,展示了如何使用Netty处理TCP连接和收发Kafka请求:
```java
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
public class NettyKafkaServer {
private static final int PORT = 8080;
public static void main(String[] args) 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 StringDecoder());
pipeline.addLast(new StringEncoder());
pipeline.addLast(new NettyKafkaServerHandler());
}
});
bootstrap.bind(PORT).sync().channel().closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
class NettyKafkaServerHandler extends SimpleChannelInboundHandler<String> {
private KafkaProducer<String, String> kafkaProducer;
public NettyKafkaServerHandler() {
// 初始化KafkaProducer
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
kafkaProducer = new KafkaProducer<>(props);
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
// TCP连接建立后的操作
System.out.println("Client connected: " + ctx.channel().remoteAddress());
}
@Override
protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
// 处理客户端发送的请求
System.out.println("Received message from client: " + msg);
// 发送消息到Kafka
String topic = "my_topic";
String key = "key";
ProducerRecord<String, String> record = new ProducerRecord<>(topic, key, msg);
kafkaProducer.send(record);
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
// TCP连接断开的操作
System.out.println("Client disconnected: " + ctx.channel().remoteAddress());
// 关闭KafkaProducer连接
kafkaProducer.close();
}
}
```
请注意,上述代码仅提供了一个简单的示例,实际应用中可能需要根据具体需求进行更复杂的处理。
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