netty 权威指南 第二版 MessagePack demo
最近在看netty 权威指南 第二版的书，坑得是运行事例时老是不能走通，网上想找第七章的源码，一个个都是积分，还是第一版的！其实demo很简单，就是有个坑，不注意，可能就是凉凉了，不深入debug，不知道有没有一次走通的？反正 我是郁闷了好久。
废话少说，上代码无组织无纪律，如果有缺少的类，以你们的能力自己补上，看不上的不要喷：（maven工程）
io.netty
netty-all
5.0.0.Alpha2
org.msgpack
msgpack
0.6.12
codec相关：
public class MessagePackDecoder extends MessageToMessageDecoder {
@Override
protected void decode(ChannelHandlerContext arg0, ByteBuf arg1, List
public class MessagePackEncoder extends MessageToByteEncoderhandler相关：
public class EchoClientHandler extends ChannelHandlerAdapter {
private final int sendNumber;
public EchoClientHandler(int sendNumber) {
this.sendNumber = sendNumber;
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
cause.printStackTrace();
ctx.close();
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
UserInfo[] infos = UserInfo();
for(UserInfo infoE:infos){
ctx.writeAndFlush(infoE);
}
ctx.flush();
}
private UserInfo[] UserInfo(){
UserInfo[] infos = new UserInfo[sendNumber];
UserInfo user = null;
for(int i=0; i"+i);
infos[i] = user;
}
return infos;
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
System.out.println("Client receive the msgpack message:"+msg );
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
ctx.flush();
}
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
System.out.println("write");
super.write(ctx, msg, promise);
}
}
public class EchoServerHandler extends ChannelHandlerAdapter {
int counter = 0;
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
cause.printStackTrace();
ctx.close();
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
System.out.println("This is " + (++counter)+" times receive client:[" + msg +"]");
ctx.writeAndFlush(msg);
}
}
最坑的就是这个UserInfo，@Message 这个注解一定要加上，不然server端收不到消息，我运行时是出现这样的问题，如果没有遇到这样的问题那你很幸运，其他的就很简单
@Message
public class UserInfo {
private int age;
private String name;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "[" +age+
"," + name +
']';
}
}
服务端EchoServer
public class EchoServer {
public void bind(int port) throws Exception{
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try{
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup,workerGroup)
.channel(NioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG,100)
.handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new ChannelInitializer() {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast("frameDecoder",new LengthFieldBasedFrameDecoder(65535,0,2,0,2));
ch.pipeline().addLast("msgpack decoder",new MessagePackDecoder());
ch.pipeline().addLast("frameEncoder",new LengthFieldPrepender(2));
ch.pipeline().addLast("msgpack encoder",new MessagePackEncoder());
ch.pipeline().addLast(new EchoServerHandler());
}
});
ChannelFuture f = b.bind(port).sync();
f.channel().closeFuture().sync();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
public static void main(String[] args) throws Exception{
int port = 8080;
new EchoServer().bind(port);
}
}
客户端 EchoClient
public class EchoClient {
public void connect(int port, String host)throws Exception{
EventLoopGroup group = new NioEventLoopGroup();
try{
Bootstrap b = new Bootstrap();
b.group(group).channel(NioSocketChannel.class)
.option(ChannelOption.TCP_NODELAY,true)
.option(ChannelOption.CONNECT_TIMEOUT_MILLIS,3000)
.handler(new ChannelInitializer() {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast("frameDecoder",new LengthFieldBasedFrameDecoder(65535,0,2,0,2));
ch.pipeline().addLast("msgpack decoder",new MessagePackDecoder());
ch.pipeline().addLast("frameEncoder",new LengthFieldPrepender(2));
ch.pipeline().addLast("msgpack encoder",new MessagePackEncoder());
ch.pipeline().addLast(new EchoClientHandler(10));
}
});
ChannelFuture f = b.connect(host,port).sync();
f.channel().closeFuture().sync();
}finally {
group.shutdownGracefully();
}
}
public static void main(String[] args) throws Exception {
int port = 8080;
new EchoClient().connect(port,"127.0.0.1");
}
} 好运！