荒野的尘埃 通过本文主要向大家介绍了Netty学习教程之Netty与Marshalling结合发送对象等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
前言
之前的一篇文章是Netty简单的学习，我们可以传递一个字符串，那么如果我们想要在Netty中传递一个对象该怎么办呢 ？
那么这个时候我们可以结合Marshalling来传递。
方法如下：
首先需要导入两个Marshalling的依赖包
jboss-marshalling-1.3.0.CR9.jar jboss-marshalling-serial-1.3.0.CR9.jar</div>
注意：我开始学习的时候只导入了第一个jar包，没有导入第二个，结果是不报错，但是客户端和服务端之间传递不了消息。所以两个包一定要都导入才行。
MarshallingCodeCFactory工具类
public class MarshallingCodeCFactory {
public static MarshallingDecoder buildMarshallingDecoder() {
final MarshallerFactory factory = Marshalling.getProvidedMarshallerFactory("serial");
final MarshallingConfiguration configuration = new MarshallingConfiguration();
configuration.setVersion(5);
UnmarshallerProvider provider = new DefaultUnmarshallerProvider(factory, configuration);
MarshallingDecoder decoder = new MarshallingDecoder(provider, 1024*1024);
return decoder;
}
public static MarshallingEncoder buildMarshallingEncoder() {
final MarshallerFactory factory = Marshalling.getProvidedMarshallerFactory("serial");
final MarshallingConfiguration configuration = new MarshallingConfiguration();
configuration.setVersion(5);
MarshallerProvider provider = new DefaultMarshallerProvider(factory, configuration);
MarshallingEncoder encoder = new MarshallingEncoder(provider);
return encoder;
}
}
</div>
server端
public class Server {
public static void main(String[] args) throws InterruptedException {
//1.第一个线程组是用于接收Client端连接的
EventLoopGroup bossGroup = new NioEventLoopGroup();
//2.第二个线程组是用于实际的业务处理的
EventLoopGroup workerGroup = new NioEventLoopGroup();
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup);//绑定两个线程池
b.channel(NioServerSocketChannel.class);//指定NIO的模式，如果是客户端就是NioSocketChannel
b.option(ChannelOption.SO_BACKLOG, 1024);//TCP的缓冲区设置
b.option(ChannelOption.SO_SNDBUF, 32*1024);//设置发送缓冲的大小
b.option(ChannelOption.SO_RCVBUF, 32*1024);//设置接收缓冲区大小
b.option(ChannelOption.SO_KEEPALIVE, true);//保持连续
b.childHandler(new ChannelInitializer<SocketChannel>() {
protected void initChannel(SocketChannel ch) throws Exception {
//设置Marshalling的编码和解码
ch.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingDecoder());
ch.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingEncoder());
ch.pipeline().addLast(new ServertHandler());
}
});
ChannelFuture future = b.bind(8765).sync();//绑定端口
future.channel().closeFuture().sync();//等待关闭(程序阻塞在这里等待客户端请求)
bossGroup.shutdownGracefully();//关闭线程
workerGroup.shutdownGracefully();//关闭线程
}
}
</div>
ServerHandler处理类
public class ServertHandler extends ChannelHandlerAdapter {
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
cause.printStackTrace();
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg)
throws Exception {
Send send = (Send) msg;
System.out.println("client发送："+send);
Receive receive = new Receive();
receive.setId(send.getId());
receive.setMessage(send.getMessage());
receive.setName(send.getName());
ctx.writeAndFlush(receive);
}
}
</div>
由于我们已经在Server端和Client端定义了传递的类型又Marshalling工厂处理，所以此时我们接收的时候直接转成发送的对象类型就行了。
Client端
public class Client {
public static void main(String[] args) throws InterruptedException {
EventLoopGroup worker = new NioEventLoopGroup();
Bootstrap b = new Bootstrap();
b.group(worker)
.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(MarshallingCodeCFactory.buildMarshallingDecoder());
sc.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingEncoder());
sc.pipeline().addLast(new ClientHandler());
}
});
ChannelFuture f=b.connect("127.0.0.1",8765).sync();
for(int i=1;i<=5;i++){
Send send = new Send();
send.setId(i);
send.setMessage("message"+i);
send.setName("name"+i);
f.channel().writeAndFlush(send);
}
f.channel().closeFuture().sync();
worker.shutdownGracefully();
}
}
</div>
ClientHandler端
public class ClientHandler extends ChannelHandlerAdapter{
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
cause.printStackTrace();
ctx.close();
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg)
throws Exception {
Receive receive = (Receive) msg;
System.out.println("server反馈："+receive);
}
}
</div>
send类
public class Send implements Serializable {
/**
* serialVersionUID:TODO（用一句话描述这个变量表示什么）
*
* @since 1.0.0
*/
private static final long serialVersionUID = 1L;
private Integer id;
private String name;
private String message;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
@Override
public String toString() {
return "Send [id=" + id + ", name=" + name + ", message=" + message + "]";
}
}
</div>
Receive类
public class Receive implements Serializable{
/**
* serialVersionUID:TODO（用一句话描述这个变量表示什么）
* @since 1.0.0
*/
private static final long serialVersionUID = 1L;
private Integer id;
private String name;
private String message;
private byte[] sss;
public byte[] getSss() {
return sss;
}
public void setSss(byte[] sss) {
this.sss = sss;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
@Override
public String toString() {
return "Receive [id=" + id + ", name=" + name + ", message=" + message + ", sss=" + Arrays.toString(sss) + "]";
}