接上篇，有人说不使用super，不就行了，但是netty是需要你super的
public class WangNetty45Server {
private static final Logger LOGGER = LoggerFactory.getLogger(WangNetty45Server.class);
public void start(int port){
EventLoopGroup boss = new NioEventLoopGroup();
EventLoopGroup work = new NioEventLoopGroup();
ServerBootstrap bootstrap = new ServerBootstrap();
try {
bootstrap.group(boss, work)
.channel(NioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG, 1024)
// .option(ChannelOption.SO_TIMEOUT, 5 * 1000)
.childOption(ChannelOption.SO_KEEPALIVE, true)
.childOption(ChannelOption.SO_RCVBUF, 10 * 1024)
.childOption(ChannelOption.SO_SNDBUF, 10 * 1024)
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel sc) throws Exception {
sc.pipeline().addLast(new WangInHandler1());
sc.pipeline().addLast(new WangInHandler2());
sc.pipeline().addLast(new WangInHandler3());
}
});
ChannelFuture future = bootstrap.bind(port).sync();
future.channel().closeFuture().sync();
} catch (Exception e) {
LOGGER.error("server 启动失败",e);
}finally{
boss.shutdownGracefully();
work.shutdownGracefully();
}
}
public static void main(String[] args) {
WangNetty45Server server = new WangNetty45Server();
server.start(8085);
}
}
package com.wang.netty4.five;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
public class WangInHandler1 extends ChannelInboundHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg)
throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler1 channelRead");
// super.channelRead(ctx, msg);
// ctx.fireChannelRead(msg);
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler1 channelReadComplete");
// super.channelReadComplete(ctx);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler1 exceptionCaught");
// super.exceptionCaught(ctx, cause);
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler1 channelActive");
// super.channelActive(ctx);
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler1 channelInactive");
// super.channelInactive(ctx);
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler1 channelRegistered");
// super.channelRegistered(ctx);
}
@Override
public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler1 channelUnregistered");
// super.channelUnregistered(ctx);
}
@Override
public void channelWritabilityChanged(ChannelHandlerContext ctx)
throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler1 channelWritabilityChanged");
// super.channelWritabilityChanged(ctx);
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt)
throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler1 userEventTriggered");
// super.userEventTriggered(ctx, evt);
}
}
public class WangInHandler2 extends ChannelInboundHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg)
throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler2 channelRead");
// super.channelRead(ctx, msg);
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler2 channelReadComplete");
// super.channelReadComplete(ctx);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler2 exceptionCaught");
// super.exceptionCaught(ctx, cause);
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler2 channelActive");
// super.channelActive(ctx);
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler2 channelInactive");
// super.channelInactive(ctx);
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler2 channelRegistered");
// super.channelRegistered(ctx);
}
@Override
public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler2 channelUnregistered");
// super.channelUnregistered(ctx);
}
@Override
public void channelWritabilityChanged(ChannelHandlerContext ctx)
throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler2 channelWritabilityChanged");
// super.channelWritabilityChanged(ctx);
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt)
throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler2 userEventTriggered");
// super.userEventTriggered(ctx, evt);
}
}
public class WangInHandler3 extends ChannelInboundHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg)
throws Exception {
// TODO Auto-generated method stub
// super.channelRead(ctx, msg);
System.out.println(" WangInHandler3 channelRead");
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler3 channelReadComplete");
// super.channelReadComplete(ctx);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler3 exceptionCaught");
// super.exceptionCaught(ctx, cause);
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler3 channelActive");
// super.channelActive(ctx);
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler3 channelInactive");
// super.channelInactive(ctx);
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler3 channelRegistered");
// super.channelRegistered(ctx);
}
@Override
public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler3 channelUnregistered");
// super.channelUnregistered(ctx);
}
@Override
public void channelWritabilityChanged(ChannelHandlerContext ctx)
throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler3 channelWritabilityChanged");
// super.channelWritabilityChanged(ctx);
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt)
throws Exception {
// TODO Auto-generated method stub
System.out.println(" WangInHandler3 userEventTriggered");
// super.userEventTriggered(ctx, evt);
}
}
执行结果
WangInHandler1 channelRegistered
WangInHandler1 channelActive
WangInHandler1 channelRead
WangInHandler1 channelReadComplete
WangInHandler1 channelReadComplete
WangInHandler1 exceptionCaught
WangInHandler1 channelInactive
WangInHandler1 channelUnregistered
大家可以看到不进行super（）的问题，就是不会进行向下传递了
因此总结是先执行自己业务，然后执行super
