JavaTCP粘包、拆包
import java.nio.ByteBuffer;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
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.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.FixedLengthFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
public class Server {
public static void main(String[] args) throws Exception{
//1 创建2个线程，一个是负责接收客户端的连接。一个是负责进行数据传输的
EventLoopGroup pGroup = new NioEventLoopGroup();
EventLoopGroup cGroup = new NioEventLoopGroup();
//2 创建服务器辅助类
ServerBootstrap b = new ServerBootstrap();
b.group(pGroup, cGroup)
.channel(NioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG, 1024)
.option(ChannelOption.SO_SNDBUF, 32*1024)
.option(ChannelOption.SO_RCVBUF, 32*1024)
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel sc) throws Exception {
//设置特殊分隔符
ByteBuf buf = Unpooled.copiedBuffer("$_".getBytes());
sc.pipeline().addLast(new DelimiterBasedFrameDecoder(1024, buf));
//设置字符串形式的解码
sc.pipeline().addLast(new StringDecoder());
sc.pipeline().addLast(new ServerHandler());
}
});
//4 绑定连接
ChannelFuture cf = b.bind(8765).sync();
//等待服务器监听端口关闭
cf.channel().closeFuture().sync();
pGroup.shutdownGracefully();
cGroup.shutdownGracefully();
}
}
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.FixedLengthFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
public class Client {
public static void main(String[] args) throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
Bootstrap b = new Bootstrap();
b.group(group)
.channel(NioSocketChannel.class)
.handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel sc) throws Exception {
//
ByteBuf buf = Unpooled.copiedBuffer("$_".getBytes());
sc.pipeline().addLast(new DelimiterBasedFrameDecoder(1024, buf));
sc.pipeline().addLast(new StringDecoder());
sc.pipeline().addLast(new ClientHandler());
}
});
ChannelFuture cf = b.connect("127.0.0.1", 8765).sync();
cf.channel().writeAndFlush(Unpooled.wrappedBuffer("bbbb$_".getBytes()));
cf.channel().writeAndFlush(Unpooled.wrappedBuffer("cccc$_".getBytes()));
//等待客户端端口关闭
cf.channel().closeFuture().sync();
group.shutdownGracefully();
}
}
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
public class ServerHandler extends ChannelHandlerAdapter {
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
System.out.println(" server channel active... ");
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
String request = (String)msg;
System.out.println("Server :" + msg);
String response = "服务器响应：" + msg + "$_";
ctx.writeAndFlush(Unpooled.copiedBuffer(response.getBytes()));
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable t) throws Exception {
ctx.close();
}
}
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.ReferenceCountUtil;
public class ClientHandler extends ChannelHandlerAdapter{
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
System.out.println("client channel active... ");
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
try {
String response = (String)msg;
System.out.println("Client: " + response);
} finally {
ReferenceCountUtil.release(msg);
}
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
ctx.close();
}
}
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandler;
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.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.timeout.ReadTimeoutHandler;
public class Server {
public Server() {
}
public static void main(String[] args) throws Exception {
EventLoopGroup pGroup = new NioEventLoopGroup();
EventLoopGroup cGroup = new NioEventLoopGroup();
ServerBootstrap b = new ServerBootstrap();
((ServerBootstrap)((ServerBootstrap)((ServerBootstrap)b.group(pGroup, cGroup).channel(NioServerSocketChannel.class)).option(ChannelOption.SO_BACKLOG, 1024)).handler(new LoggingHandler(LogLevel.INFO))).childHandler(new ChannelInitializer<SocketChannel>() {
protected void initChannel(SocketChannel sc) throws Exception {
sc.pipeline().addLast(new ChannelHandler[]{MarshallingCodeCFactory.buildMarshallingDecoder()});
sc.pipeline().addLast(new ChannelHandler[]{MarshallingCodeCFactory.buildMarshallingEncoder()});
sc.pipeline().addLast(new ChannelHandler[]{new ReadTimeoutHandler(5)});
sc.pipeline().addLast(new ChannelHandler[]{new ServerHandler()});
}
});
ChannelFuture cf = b.bind(8765).sync();
cf.channel().closeFuture().sync();
pGroup.shutdownGracefully();
cGroup.shutdownGracefully();
}
}
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandler;
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;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.timeout.ReadTimeoutHandler;
import java.util.concurrent.TimeUnit;
public class Client {
private EventLoopGroup group;
private Bootstrap b;
private ChannelFuture cf;
public static Client getInstance() {
return Client.SingletonHolder.instance;
}
private Client() {
this.group = new NioEventLoopGroup();
this.b = new Bootstrap();
((Bootstrap)((Bootstrap)((Bootstrap)this.b.group(this.group)).channel(NioSocketChannel.class)).handler(new LoggingHandler(LogLevel.INFO))).handler(new ChannelInitializer<SocketChannel>() {
protected void initChannel(SocketChannel sc) throws Exception {
sc.pipeline().addLast(new ChannelHandler[]{MarshallingCodeCFactory.buildMarshallingDecoder()});
sc.pipeline().addLast(new ChannelHandler[]{MarshallingCodeCFactory.buildMarshallingEncoder()});
sc.pipeline().addLast(new ChannelHandler[]{new ReadTimeoutHandler(5)});
sc.pipeline().addLast(new ChannelHandler[]{new ClientHandler()});
}
});
}
public void connect() {
try {
this.cf = this.b.connect("127.0.0.1", 8765).sync();
System.out.println("远程服务器已经连接, 可以进行数据交换..");
} catch (Exception var2) {
var2.printStackTrace();
}
}
public ChannelFuture getChannelFuture() {
if (this.cf == null) {
this.connect();
}
if (!this.cf.channel().isActive()) {
this.connect();
}
return this.cf;
}
public static void main(String[] args) throws Exception {
final Client c = getInstance();
ChannelFuture cf = c.getChannelFuture();
for(int i = 1; i <= 3; ++i) {
Request request = new Request();
request.setId("" + i);
request.setName("pro" + i);
request.setRequestMessage("数据信息" + i);
cf.channel().writeAndFlush(request);
TimeUnit.SECONDS.sleep(4L);
}
cf.channel().closeFuture().sync();
(new Thread(new Runnable() {
public void run() {
try {
System.out.println("进入子线程...");
ChannelFuture cf = c.getChannelFuture();
System.out.println(cf.channel().isActive());
System.out.println(cf.channel().isOpen());
Request request = new Request();
request.setId("4");
request.setName("pro4");
request.setRequestMessage("数据信息4");
cf.channel().writeAndFlush(request);
cf.channel().closeFuture().sync();
System.out.println("子线程结束.");
} catch (InterruptedException var3) {
var3.printStackTrace();
}
}
})).start();
System.out.println("断开连接,主线程结束..");
}
private static class SingletonHolder {
static final Client instance = new Client((Client)null);
private SingletonHolder() {
}
}
}
