利用LineBasedFrameDecoder解决TCP粘包问题
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1：TimeServer类
import io.netty.bootstrap.ServerBootstrap;import io.netty.channel.ChannelFuture;import io.netty.channel.ChannelInitializer;import io.netty.channel.ChannelOption;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.LineBasedFrameDecoder;import io.netty.handler.codec.string.StringDecoder;public class TimeServer { public void bind(int port) throws Exception { EventLoopGroup bossGroup = new NioEventLoopGroup(); EventLoopGroup workerGroup = new NioEventLoopGroup(); try { ServerBootstrap serverBootstrap = new ServerBootstrap(); serverBootstrap.group(bossGroup, workerGroup) .channel(NioServerSocketChannel.class) .option(ChannelOption.SO_BACKLOG, 1024) .childHandler(new ChildChannelHandler()); //绑定端口，同步等待成功 ChannelFuture future = serverBootstrap.bind(port).sync(); //等待服务端监听端口关闭 future.channel().closeFuture().sync(); } catch (Exception e) { e.printStackTrace(); } finally { //优雅退出 bossGroup.shutdownGracefully(); workerGroup.shutdownGracefully(); } } private class ChildChannelHandler extends ChannelInitializer<SocketChannel> { @Override protected void initChannel(SocketChannel socketChannel) throws Exception { socketChannel.pipeline().addLast(new LineBasedFrameDecoder(1024)); socketChannel.pipeline().addLast(new StringDecoder()); socketChannel.pipeline().addLast(new TimeServerHandler()); } } public static void main(String[] args) throws Exception { int port = 8080; if (args != null && args.length > 0) { try { port = Integer.parseInt(args[0]); } catch (Exception e) { e.printStackTrace(); } } new TimeServer().bind(port); }}2：TimeServerHandler
import io.netty.buffer.ByteBuf;import io.netty.buffer.Unpooled;import io.netty.channel.ChannelHandlerAdapter;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelInboundHandlerAdapter;import java.sql.Timestamp;import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.Date;public class TimeServerHandler extends ChannelInboundHandlerAdapter { private int counter = 0; public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { String body = (String)msg; System.out.println("The time server receive order : " + body + "; the counter is " + (++this.counter)); String currentTime = "QUERY TIME ORDER".equalsIgnoreCase(body) ? new Date(System.currentTimeMillis()).toString() : "BAD ORDER"; currentTime += System.getProperty("line.separator"); ByteBuf resp = Unpooled.copiedBuffer(currentTime.getBytes()); ctx.writeAndFlush(resp); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { super.exceptionCaught(ctx, cause); }}3：TimeClient
import io.netty.bootstrap.Bootstrap;import io.netty.channel.ChannelFuture;import io.netty.channel.ChannelInitializer;import io.netty.channel.ChannelOption;import io.netty.channel.EventLoopGroup;import io.netty.channel.nio.NioEventLoopGroup;import io.netty.channel.socket.SocketChannel;import io.netty.channel.socket.nio.NioSocketChannel;import io.netty.handler.codec.LineBasedFrameDecoder;import io.netty.handler.codec.string.StringDecoder;public class TimeClient { public void connect(int port, String host) throws Exception { //配置客户端NIO线程组 EventLoopGroup eventLoopGroup = new NioEventLoopGroup(); try { Bootstrap bootstrap = new Bootstrap(); bootstrap.group(eventLoopGroup) .channel(NioSocketChannel.class) .option(ChannelOption.SO_BACKLOG, 1024) .handler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel socketChannel) throws Exception { socketChannel.pipeline().addLast(new LineBasedFrameDecoder(1024)); socketChannel.pipeline().addLast(new StringDecoder()); socketChannel.pipeline().addLast(new TimeClientHandler()); } }); //发起异步链接操作 ChannelFuture channelFuture = bootstrap.connect(host, port).sync(); //等待客户端链路关闭 channelFuture.channel().closeFuture().sync(); } catch (Exception e) { e.printStackTrace(); } finally { //优雅退出，释放NIO线程组 eventLoopGroup.shutdownGracefully(); } } public static void main(String[] args) throws Exception { int port = 8080; if (args != null && args.length > 0) { try { port = Integer.parseInt(args[0]); } catch (Exception e) { //采用默认值 e.printStackTrace(); } } new TimeClient().connect(port, "127.0.0.1"); }}4：TimeClientHandler
import io.netty.buffer.ByteBuf;import io.netty.buffer.Unpooled;import io.netty.channel.ChannelHandlerAdapter;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelInboundHandlerAdapter;public class TimeClientHandler extends ChannelInboundHandlerAdapter { private int counter = 0; private byte[] req; public TimeClientHandler() { req = ("QUERY TIME ORDER" + System.getProperty("line.separator")).getBytes(); } public void channelActive(ChannelHandlerContext ctx) { ByteBuf message = null; for (int i = 0; i < 100; i++) { message = Unpooled.buffer(req.length); message.writeBytes(req); ctx.writeAndFlush(message); } } public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { String body = (String)msg; System.out.println("Now is " + body + "; the counter is " + (++this.counter)); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { super.exceptionCaught(ctx, cause); }}TimeServer端：
The time server receive order : QUERY TIME ORDER; the counter is 1
The time server receive order : QUERY TIME ORDER; the counter is 2
The time server receive order : QUERY TIME ORDER; the counter is 3
The time server receive order : QUERY TIME ORDER; the counter is 4
The time server receive order : QUERY TIME ORDER; the counter is 5
The time server receive order : QUERY TIME ORDER; the counter is 6
The time server receive order : QUERY TIME ORDER; the counter is 7
The time server receive order : QUERY TIME ORDER; the counter is 8
The time server receive order : QUERY TIME ORDER; the counter is 9
The time server receive order : QUERY TIME ORDER; the counter is 10
The time server receive order : QUERY TIME ORDER; the counter is 11
The time server receive order : QUERY TIME ORDER; the counter is 12
The time server receive order : QUERY TIME ORDER; the counter is 13
The time server receive order : QUERY TIME ORDER; the counter is 14
The time server receive order : QUERY TIME ORDER; the counter is 15
The time server receive order : QUERY TIME ORDER; the counter is 16
The time server receive order : QUERY TIME ORDER; the counter is 17
The time server receive order : QUERY TIME ORDER; the counter is 18
The time server receive order : QUERY TIME ORDER; the counter is 19
The time server receive order : QUERY TIME ORDER; the counter is 20
The time server receive order : QUERY TIME ORDER; the counter is 21
The time server receive order : QUERY TIME ORDER; the counter is 22
The time server receive order : QUERY TIME ORDER; the counter is 23
The time server receive order : QUERY TIME ORDER; the counter is 24
The time server receive order : QUERY TIME ORDER; the counter is 25
The time server receive order : QUERY TIME ORDER; the counter is 26
The time server receive order : QUERY TIME ORDER; the counter is 27
The time server receive order : QUERY TIME ORDER; the counter is 28
The time server receive order : QUERY TIME ORDER; the counter is 29
The time server receive order : QUERY TIME ORDER; the counter is 30
The time server receive order : QUERY TIME ORDER; the counter is 31
The time server receive order : QUERY TIME ORDER; the counter is 32
The time server receive order : QUERY TIME ORDER; the counter is 33
The time server receive order : QUERY TIME ORDER; the counter is 34
The time server receive order : QUERY TIME ORDER; the counter is 35
The time server receive order : QUERY TIME ORDER; the counter is 36
The time server receive order : QUERY TIME ORDER; the counter is 37
The time server receive order : QUERY TIME ORDER; the counter is 38
The time server receive order : QUERY TIME ORDER; the counter is 39
The time server receive order : QUERY TIME ORDER; the counter is 40
The time server receive order : QUERY TIME ORDER; the counter is 41
The time server receive order : QUERY TIME ORDER; the counter is 42
The time server receive order : QUERY TIME ORDER; the counter is 43
The time server receive order : QUERY TIME ORDER; the counter is 44
The time server receive order : QUERY TIME ORDER; the counter is 45
The time server receive order : QUERY TIME ORDER; the counter is 46
The time server receive order : QUERY TIME ORDER; the counter is 47
The time server receive order : QUERY TIME ORDER; the counter is 48
The time server receive order : QUERY TIME ORDER; the counter is 49
The time server receive order : QUERY TIME ORDER; the counter is 50
The time server receive order : QUERY TIME ORDER; the counter is 51
The time server receive order : QUERY TIME ORDER; the counter is 52
The time server receive order : QUERY TIME ORDER; the counter is 53
The time server receive order : QUERY TIME ORDER; the counter is 54
The time server receive order : QUERY TIME ORDER; the counter is 55
The time server receive order : QUERY TIME ORDER; the counter is 56
The time server receive order : QUERY TIME ORDER; the counter is 57
The time server receive order : QUERY TIME ORDER; the counter is 58
The time server receive order : QUERY TIME ORDER; the counter is 59
The time server receive order : QUERY TIME ORDER; the counter is 60
The time server receive order : QUERY TIME ORDER; the counter is 61
The time server receive order : QUERY TIME ORDER; the counter is 62
The time server receive order : QUERY TIME ORDER; the counter is 63
The time server receive order : QUERY TIME ORDER; the counter is 64
The time server receive order : QUERY TIME ORDER; the counter is 65
The time server receive order : QUERY TIME ORDER; the counter is 66
The time server receive order : QUERY TIME ORDER; the counter is 67
The time server receive order : QUERY TIME ORDER; the counter is 68
The time server receive order : QUERY TIME ORDER; the counter is 69
The time server receive order : QUERY TIME ORDER; the counter is 70
The time server receive order : QUERY TIME ORDER; the counter is 71
The time server receive order : QUERY TIME ORDER; the counter is 72
The time server receive order : QUERY TIME ORDER; the counter is 73
The time server receive order : QUERY TIME ORDER; the counter is 74
The time server receive order : QUERY TIME ORDER; the counter is 75
The time server receive order : QUERY TIME ORDER; the counter is 76
The time server receive order : QUERY TIME ORDER; the counter is 77
The time server receive order : QUERY TIME ORDER; the counter is 78
The time server receive order : QUERY TIME ORDER; the counter is 79
The time server receive order : QUERY TIME ORDER; the counter is 80
The time server receive order : QUERY TIME ORDER; the counter is 81
The time server receive order : QUERY TIME ORDER; the counter is 82
The time server receive order : QUERY TIME ORDER; the counter is 83
The time server receive order : QUERY TIME ORDER; the counter is 84
The time server receive order : QUERY TIME ORDER; the counter is 85
The time server receive order : QUERY TIME ORDER; the counter is 86
The time server receive order : QUERY TIME ORDER; the counter is 87
The time server receive order : QUERY TIME ORDER; the counter is 88
The time server receive order : QUERY TIME ORDER; the counter is 89
The time server receive order : QUERY TIME ORDER; the counter is 90
The time server receive order : QUERY TIME ORDER; the counter is 91
The time server receive order : QUERY TIME ORDER; the counter is 92
The time server receive order : QUERY TIME ORDER; the counter is 93
The time server receive order : QUERY TIME ORDER; the counter is 94
The time server receive order : QUERY TIME ORDER; the counter is 95
The time server receive order : QUERY TIME ORDER; the counter is 96
The time server receive order : QUERY TIME ORDER; the counter is 97
The time server receive order : QUERY TIME ORDER; the counter is 98
The time server receive order : QUERY TIME ORDER; the counter is 99
The time server receive order : QUERY TIME ORDER; the counter is 100
TimeClient端：
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 1
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 2
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 3
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 4
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 5
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 6
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 7
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 8
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 9
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 10
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 11
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 12
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 13
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 14
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 15
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 16
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 17
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 18
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 19
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 20
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 21
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 22
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 23
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 24
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 25
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 26
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 27
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 28
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 29
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 30
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 31
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 32
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 33
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 34
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 35
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 36
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 37
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 38
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 39
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 40
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 41
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 42
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 43
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 44
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 45
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 46
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 47
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 48
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 49
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 50
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 51
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 52
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 53
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 54
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 55
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 56
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 57
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 58
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 59
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 60
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 61
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 62
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 63
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 64
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 65
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 66
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 67
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 68
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 69
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 70
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 71
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 72
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 73
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 74
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 75
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 76
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 77
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 78
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 79
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 80
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 81
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 82
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 83
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 84
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 85
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 86
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 87
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 88
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 89
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 90
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 91
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 92
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 93
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 94
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 95
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 96
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 97
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 98
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 99
Now is Mon Jul 10 00:55:19 CST 2017; the counter is 100
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