Apache camel netty自定义编码器和解码器示例

时间:2015-10-27 15:46:35

标签: java tcp apache-camel netty

Apache camel netty tcp组件doc(http://camel.apache.org/netty.html)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.

解码器

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

请你指点一下如何在覆盖课堂上做什么/做什么。我想要一个自定义的tcp编码器/解码器来读/写字节。

3 个答案:

答案 0 :(得分:1)

这个类及它的超类是编码器,你可以用它作为例子:org.jboss.netty.handler.codec.string.StringEncoder

在“使用多个编解码器”标题的netty页面上的示例中使用了其他类,您可以查看源代码以了解它们如何使用该接口。

如果没有,最好查看netty项目并查看编码器的单元测试。

答案 1 :(得分:1)

在netty文档中,有编码器和解码器使用ChannelHandler的代码。来自文档:

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);

然后你参考编码器/解码器:

from("netty4:tcp://localhost:{{port}}?decoders=#length-decoder,#string-decoder&sync=false")

我建议您先退后一步,使用textline = true和allowDefaultCodec = false运行您的netty流程,看看您的网络通信是否正常工作。然后交出编码器/解码器部分。

答案 2 :(得分:0)

创建一个SimpleRegistry并将其传递给CamelContext:

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