在上一篇文章中《Android 基於Netty的消息推送方案之字符串的接收和發送(三)》我們介紹了Netty的字符串傳遞,我們知道了Netty的消息傳遞都是基於流,通過ChannelBuffer傳遞的,那麼自然,Object也需要轉換成ChannelBuffer來傳遞。好在Netty本身已經給我們寫好了這樣的轉換工具。ObjectEncoder和ObjectDecoder,下面我們介紹一個案例。
1. 我們構造一個用來傳輸的對象(JavaBean)
@SuppressWarnings("serial")
public class Command implements Serializable {
private String actionName;
public String getActionName() {
return actionName;
}
public void setActionName(String actionName) {
this.actionName = actionName;
}
}
2.我們先看一下Client的代碼
public class ObjectClient {
public static void main(String args[]) {
ClientBootstrap bootstrap = new ClientBootstrap(new NioClientSocketChannelFactory(Executors.newCachedThreadPool(), Executors.newCachedThreadPool()));
bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
@Override
public ChannelPipeline getPipeline() throws Exception {
return Channels.pipeline(new ObjectEncoder(), new ObjectClientHandler());
}
});
bootstrap.connect(new InetSocketAddress("127.0.0.1", 8000));
}
}
class ObjectClientHandler extends SimpleChannelHandler {
/**
* 當綁定到服務端的時候觸發,給服務端發消息。
*/
@Override
public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) {
// 向服務端發送Object信息
sendObject(e.getChannel());
}
/**
* 發送Object
* @param channel
*/
private void sendObject(Channel channel) {
Command command = new Command();
command.setActionName("Hello action.");
channel.write(command);
}
}
3.再看一下服務端的代碼
public class ObjectServer {
public static void main(String args[]) {
// Server服務啓動器
ServerBootstrap bootstrap = new ServerBootstrap(new NioServerSocketChannelFactory(Executors.newCachedThreadPool(), Executors.newCachedThreadPool()));
// 設置一個處理客戶端消息和各種消息事件的類(Handler)
bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
@Override
public ChannelPipeline getPipeline() throws Exception {
//先編碼 --> 後處理自己的業務
return Channels.pipeline(new ObjectDecoder(ClassResolvers.cacheDisabled(this.getClass().getClassLoader())), new ObjectServerHandler());
}
});
bootstrap.bind(new InetSocketAddress(8000));
}
}
class ObjectServerHandler extends SimpleChannelHandler {
/**
* 當接受到消息的時候觸發
*/
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
Command command = (Command) e.getMessage();
// 打印看看是不是我們剛纔傳過來的那個
System.out.println(command.getActionName());
}
}
先運行服務端,再運行客戶端,然後在服務端的控制檯中打印如下字符串
Hello action.