springboot基于netty加websocket实现高性能IM系统案例
在这个案例中,我们将实现WebSocket的处理器和初始化配置。
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.websocketx.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
@Component
public class WebSocketHandler extends SimpleChannelInboundHandler<WebSocketFrame> {
private static final Map<String, ChannelHandlerContext> clients = new ConcurrentHashMap<>();
@Autowired
private TextWebSocketHandler textWebSocketHandler;
@Override
protected void channelRead0(ChannelHandlerContext ctx, WebSocketFrame frame) throws Exception {
// 判断是否WebSocket握手请求
if (frame instanceof FullHttpRequest) {
handleHttpRequest(ctx, (FullHttpRequest) frame);
} else if (frame instanceof CloseWebSocketFrame) {
// 关闭WebSocket连接
handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame.retain());
} else if (frame instanceof PingWebSocketFrame) {
// 发送Pong消息
ctx.channel().write(new PongWebSocketFrame(frame.content().retain()));
} else if (frame instanceof TextWebSocketFrame) {
// 处理文本消息
String message = ((TextWebSocketFrame) frame).text();
textWebSocketHandler.handleTextMessage(ctx, message);
} else {
throw new UnsupportedOperationException("Unsupported frame type: " + frame.getClass().getName());
}
}
private void handleHttpRequest(ChannelHandlerContext ctx, FullHttpRequest req) {
// 如果HTTP请求不是WebSocket握手请求,则返回HTTP响应
if (!handshaker.isWebSocketUpgradeRequest(req)) {
sendHttpResponse(ctx, req, new DefaultFullHttpResponse(req.protocolVersion(), HttpResponseStatus.BAD_REQUEST));
return;
}
// 构造握手响应返回
handshaker.handshake(ctx.channel(), req);
}
private void sendHttpResponse(ChannelHandlerContext ctx, FullHttpRequest req, DefaultFullHttpResponse res) {
// 发送HTTP响应
if (res.status().code() != 200) {
ByteBuf byteBuf = Unpooled.copiedBuff
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