Java Apache camel netty自定义编码器和解码器示例

Apache camel netty tcp组件doc（）说

编码器

A custom ChannelHandler class that can be used to perform special marshalling of outbound payloads. Must override org.jboss.netty.channel.ChannelDownStreamHandler.

译码器

A custom ChannelHandler class that can be used to perform special marshalling of inbound payloads. Must override org.jboss.netty.channel.ChannelUpStreamHandler.

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你能给我举个例子说明在重写类中如何/怎么做吗。我需要一个自定义的tcp编码器/解码器来读/写字节。

这个类和它的超类都是编码器，您可以使用它作为示例：

netty页面上的示例中使用了“使用多个编解码器”标题中的其他类，您可以查看源代码以了解它们如何使用接口

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如果不能做到这一点，最好看看netty项目和编码器的单元测试。

在netty文档中，有用于编码器和解码器的ChannelHandler代码。从文件中：

ChannelHandlerFactory lengthDecoder = ChannelHandlerFactories.newLengthFieldBasedFrameDecoder(1048576, 0, 4, 0, 4);

StringDecoder stringDecoder = new StringDecoder();
registry.bind("length-decoder", lengthDecoder);
registry.bind("string-decoder", stringDecoder);

LengthFieldPrepender lengthEncoder = new LengthFieldPrepender(4);
StringEncoder stringEncoder = new StringEncoder();
registry.bind("length-encoder", lengthEncoder);
registry.bind("string-encoder", stringEncoder);

List<ChannelHandler> decoders = new ArrayList<ChannelHandler>();
decoders.add(lengthDecoder);
decoders.add(stringDecoder);

List<ChannelHandler> encoders = new ArrayList<ChannelHandler>();
encoders.add(lengthEncoder);
encoders.add(stringEncoder);

registry.bind("encoders", encoders);
registry.bind("decoders", decoders);

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我建议你先退一步，用textline=true和allowDefaultCodec=false运行netty流，看看netty通信是否正常。然后交给编码器/解码器部分。

创建一个简单注册表并将其传递给上下文：

SimpleRegistry simpleRegistry = new SimpleRegistry();
simpleRegistry.put("stringEncoder", new StringEncoder());
simpleRegistry.put("stringDecoder", new StringDecoder());
CamelContext context = new DefaultCamelContext(simpleRegistry);

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还有一个关于《骆驼行动手册》的小例子，源代码免费提供：

SimpleRegistry simpleRegistry = new SimpleRegistry();
simpleRegistry.put("stringEncoder", new StringEncoder());
simpleRegistry.put("stringDecoder", new StringDecoder());
CamelContext context = new DefaultCamelContext(simpleRegistry);