标签：protect code ted byte Matter generate oid pip remote
TCP是个“流”协议，所谓流，就是没有界限的一串数据。大家可以想想河里的流水，是连成一片的，其间并没有分界线。TCP底层并不了解上层业务数据的具体含义，它会根据TCP缓冲区的实际情况进行包的划分，所以在业务上认为，一个完整的包可能会被TCP拆分成多个包进行发送，也有可能把多个小的包封装成一个大的数据包发送，这就是所谓的TCP粘包和拆包问题。
服务端Server
package com.xm.netty.demo02;
import java.net.InetSocketAddress;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
public class Server {
private final int port;
public Server(int port) {
this.port = port;
}
public static void main(String[] args) {
int port = 8989;
try {
new Server(port).start();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void start() throws InterruptedException {
EventLoopGroup g1 = new NioEventLoopGroup();
EventLoopGroup g2 = new NioEventLoopGroup();
try {
ServerBootstrap bootstrap = new ServerBootstrap();
bootstrap
.group(g1,g2)
.channel(NioServerSocketChannel.class)
.localAddress(new InetSocketAddress( port))
.childHandler(new ChannelInitializer() {
@Override
protected void initChannel(Channel ch) throws Exception {
ch.pipeline().addLast(new ServerHandler());
}
});
ChannelFuture future = bootstrap.bind().sync();
future.channel().closeFuture().sync();
} finally {
g1.shutdownGracefully().sync();
g2.shutdownGracefully().sync();
}
}
}
服务端ServerHandler
package com.xm.netty.demo02;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.CharsetUtil;
public class ServerHandler extends ChannelHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
ByteBuf in = (ByteBuf) msg;
String str = in.toString(CharsetUtil.UTF_8);
System.out.println("Server:"+str);
str = "服务器返回--->"+ str;
ctx.writeAndFlush(Unpooled.copiedBuffer(str.getBytes()));
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
cause.printStackTrace();
ctx.close();
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
System.out.println(DateTimeFormatter.ISO_LOCAL_DATE_TIME.format(LocalDateTime.now())+"一个客户端连接!");
}
}
客户端Client
package com.xm.netty.demo02;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
public class Client {
private final int port;
private final String host;
public Client(int port, String host) {
this.port = port;
this.host = host;
}
public static void main(String[] args) {
String host = "127.0.0.1";
int port = 8989;
try {
new Client(port, host).start();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void start() throws InterruptedException {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap bootstrap = new Bootstrap();
bootstrap
.group(group)
.channel(NioSocketChannel.class)
.remoteAddress(host, port)
.handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(new ClientHandler());
}
});
ChannelFuture future = bootstrap.connect().sync();
for(int i=10;i<20;i++) {
String str = DateTimeFormatter.ISO_LOCAL_DATE_TIME.format(LocalDateTime.now()) + "---- " +i+"<<<";
future.channel().writeAndFlush(Unpooled.copiedBuffer(str.getBytes()));
}
future.channel().closeFuture().sync();
} finally {
group.shutdownGracefully().sync();
}
}
}
客户端ClientHandler
package com.xm.netty.demo02;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.CharsetUtil;
import io.netty.util.ReferenceCountUtil;
public class ClientHandler extends ChannelHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
try {
ByteBuf in = (ByteBuf) msg;
String str = in.toString(CharsetUtil.UTF_8);
System.out.println("Client:"+str);
} finally {
ReferenceCountUtil.release(msg);
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
cause.printStackTrace();
ctx.close();
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
System.out.println(DateTimeFormatter.ISO_LOCAL_DATE_TIME.format(LocalDateTime.now())+" 已连接上服务器！");
}
}
添加依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.xm</groupId>
<artifactId>netty</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>5.0.0.Alpha2</version>
</dependency>
</dependencies>
</project>预期结果
1）服务器
2018-10-11T18:37:19.857一个客户端连接!
Server:2018-10-11T18:37:19.855---- 10<<<
Server:2018-10-11T18:37:20.377---- 11<<<
Server:2018-10-11T18:37:20.877---- 12<<<
Server:2018-10-11T18:37:21.378---- 13<<<
Server:2018-10-11T18:37:21.879---- 14<<<
Server:2018-10-11T18:37:22.379---- 15<<<
Server:2018-10-11T18:37:22.879---- 16<<<
Server:2018-10-11T18:37:23.38---- 17<<<
Server:2018-10-11T18:37:23.881---- 18<<<
Server:2018-10-11T18:37:24.382---- 19<<<
（2）客户端
2018-10-11T18:37:19.855 已连接上服务器！
Client:服务器返回--->2018-10-11T18:37:19.855---- 10<<<
Client:服务器返回--->2018-10-11T18:37:20.377---- 11<<<
Client:服务器返回--->2018-10-11T18:37:20.877---- 12<<<
Client:服务器返回--->2018-10-11T18:37:21.378---- 13<<<
Client:服务器返回--->2018-10-11T18:37:21.879---- 14<<<
Client:服务器返回--->2018-10-11T18:37:22.379---- 15<<<
Client:服务器返回--->2018-10-11T18:37:22.879---- 16<<<
Client:服务器返回--->2018-10-11T18:37:23.38---- 17<<<
Client:服务器返回--->2018-10-11T18:37:23.881---- 18<<<
Client:服务器返回--->2018-10-11T18:37:24.382---- 19<<<
实际结果
（1）服务器
2018-10-11T18:35:40.988一个客户端连接!
Server:2018-10-11T18:35:40.986---- 10<<<2018-10-11T18:35:41.01---- 11<<<2018-10-11T18:35:41.01---- 12<<<2018-10-11T18:35:41.01---- 13<<<2018-10-11T18:35:41.01---- 14<<<2018-10-11T18:35:41.01---- 15<<<2018-10-11T18:35:41.01---- 16<<<2018-10-11T18:35:41.01---- 17<<<2018-10-11T18:35:41.01---- 18<<<2018-10-11T18:35:41.01---- 19<<<
（2）客户端
2018-10-11T18:35:40.986 已连接上服务器！
Client:服务器返回--->2018-10-11T18:35:40.986---- 10<<<2018-10-11T18:35:41.01---- 11<<<2018-10-11T18:35:41.01---- 12<<<2018-10-11T18:35:41.01---- 13<<<2018-10-11T18:35:41.01---- 14<<<2018-10-11T18:35:41.01---- 15<<<2018-10-11T18:35:41.01---- 16<<<2018-10-11T18:35:41.01---- 17<<<2018-10-11T18:35:41.01---- 18<<<2018-10-11T18:35:41.01---- 19<<<
标签：protect code ted byte Matter generate oid pip remote
原文地址：https://www.cnblogs.com/TimerHotel/p/netty02.html
