[英]How to send ISO message Object from client to Netty server in java
[英]How to manipulate Message coming from Netty server/client
我正在為Netty客戶端/服務器傳輸的字符串制作原型,現在我想在字符串到達服務器端時將這些字符串傳遞給文件。
客戶:
private ClientBootstrap bootstrap;
private Channel connector;
private MyHandler handler=new MyHandler();
public boolean start() {
// Standard netty bootstrapping stuff.
Executor bossPool = Executors.newCachedThreadPool();
Executor workerPool = Executors.newCachedThreadPool();
ChannelFactory factory =
new NioClientSocketChannelFactory(bossPool, workerPool);
this.bootstrap = new ClientBootstrap(factory);
// Declared outside to fit under 80 char limit
final DelimiterBasedFrameDecoder frameDecoder =
new DelimiterBasedFrameDecoder(Integer.MAX_VALUE,
Delimiters.lineDelimiter());
this.bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
public ChannelPipeline getPipeline() throws Exception {
return Channels.pipeline(
handler,
frameDecoder,
new StringDecoder(),
new StringEncoder());
}
});
ChannelFuture future = this.bootstrap
.connect(new InetSocketAddress("localhost", 12345));
if (!future.awaitUninterruptibly().isSuccess()) {
System.out.println("--- CLIENT - Failed to connect to server at " +
"localhost:12345.");
this.bootstrap.releaseExternalResources();
return false;
}
this.connector = future.getChannel();
return this.connector.isConnected();
}
public void stop() {
if (this.connector != null) {
this.connector.close().awaitUninterruptibly();
}
this.bootstrap.releaseExternalResources();
System.out.println("--- CLIENT - Stopped.");
}
public boolean sendMessage(String message) {
if (this.connector.isConnected()) {
// Append \n if it's not present, because of the frame delimiter
if (!message.endsWith("\n")) {
this.connector.write(message + '\n');
} else {
this.connector.write(message);
}
System.out.print(message);
return true;
}
return false;
}
服務器:
private final String id;
private ServerBootstrap bootstrap;
private ChannelGroup channelGroup;
private MyHandler handler= new MyHandler();
public Server(String id) {
this.id = id;
}
// public methods ---------------------------------------------------------
public boolean start() {
// Pretty standard Netty startup stuff...
// boss/worker executors, channel factory, channel group, pipeline, ...
Executor bossPool = Executors.newCachedThreadPool();
Executor workerPool = Executors.newCachedThreadPool();
ChannelFactory factory =
new NioServerSocketChannelFactory(bossPool, workerPool);
this.bootstrap = new ServerBootstrap(factory);
this.channelGroup = new DefaultChannelGroup(this.id + "-all-channels");
// declared here to fit under the 80 char limit
final ChannelHandler delimiter =
new DelimiterBasedFrameDecoder(Integer.MAX_VALUE,
Delimiters.lineDelimiter());
this.bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
@Override
public ChannelPipeline getPipeline() throws Exception {
SimpleChannelHandler handshakeHandler =
new SimpleChannelHandler();
return Channels.pipeline(
handler,
delimiter,
new StringDecoder(),
new StringEncoder(),
handshakeHandler);
}
});
Channel acceptor = this.bootstrap.bind(new InetSocketAddress(12345));
if (acceptor.isBound()) {
System.out.println("+++ SERVER - bound to *:12345");
this.channelGroup.add(acceptor);
return true;
} else {
System.err.println("+++ SERVER - Failed to bind to *:12345");
this.bootstrap.releaseExternalResources();
return false;
}
}
public void stop() {
this.channelGroup.close().awaitUninterruptibly();
this.bootstrap.releaseExternalResources();
System.err.println("+++ SERVER - Stopped.");
}
使用的處理程序:客戶端處理程序:
public class MyHandler extends SimpleChannelUpstreamHandler{
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
throws Exception {
if(e.getMessage() instanceof String){
System.out.println((String)e.getMessage());
}
System.out.println(e.getMessage().toString());
}
}
服務器處理程序:
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
throws Exception {
Channel channel= ctx.getChannel();
channel.write(e.getMessage());
if(e.getMessage() instanceof String){
System.out.println((String)e.getMessage());
}
System.out.println(e.getMessage().toString());
}
客戶亞軍:
public static void main(String[] args) throws InterruptedException {
final int nMessages = 5;
try {
Client c = new Client();
if (!c.start()) {
return;
}
for (int i = 0; i < nMessages; i++) {
Thread.sleep(1L);
c.sendMessage((i + 1) + "\n");
}
c.stop();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
服務器運行器:
public static void main(String[] args) {
final Server s = new Server("server1");
if (!s.start()) {
return;
}
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
s.stop();
}
});
}
現在,我真正需要的是打印我在客戶端和服務器端在通道上編寫的消息,對此我感到非常困惑。
乍一看,您的管道創建似乎是錯誤的。 在服務器端進行解碼時,首先需要使用Delimiter
,然后是StringDecoder
,然后是業務處理程序。 您可以通過在這些解碼器和編碼器中放置斷點來解決此問題。 還可以查看此鏈接,以獲取有關其工作原理的非常好的文檔。
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