EchoServerHandler.java

package com.github.nettybook.ch1;

import java.nio.charset.Charset;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

/**
 * Handles a server-side channel.
 */
public class EchoServerHandler extends ChannelInboundHandlerAdapter {
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        String readMessage = ((ByteBuf) msg).toString(Charset.defaultCharset());

        StringBuilder builder = new StringBuilder();
        builder.append("수신한 문자열 [");
        builder.append(readMessage);
        builder.append("]");
        System.out.println(builder.toString());

        ctx.write(msg);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        // Close the connection when an exception is raised.
        cause.printStackTrace();
        ctx.close();
    }
}