Netty指定分隔的字符

package org.zln.netty.five.part02;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;

/**
 * Created by sherry on 16/11/5.
 */
public class EchoServerInitializer extends ChannelInitializer<SocketChannel> {
    @Override
    protected void initChannel(SocketChannel socketChannel) throws Exception {

        //指定分隔符
        ByteBuf delimiter = Unpooled.copiedBuffer("$_".getBytes("UTF-8"));

        ChannelPipeline pipeline = socketChannel.pipeline();

        pipeline.addLast(new DelimiterBasedFrameDecoder(1024,delimiter));
        pipeline.addLast(new StringDecoder());
        pipeline.addLast(new EchoServerHandler());



    }
}

使用 DelimiterBasedFrameDecoder 解码器

通过 

ByteBuf delimiter = Unpooled.copiedBuffer("$_".getBytes("UTF-8")) ;

构建了自定义的分隔符，在

pipeline.addLast(new DelimiterBasedFrameDecoder(1024,delimiter));

中传入

delimiter 也可以是一个数组

new ByteBuf[] {
                Unpooled.wrappedBuffer(new byte[] { '
', '
' }),
                Unpooled.wrappedBuffer(new byte[] { '
' }),
        };

Netty提供了一个类，保存了常用的分隔符

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.codec;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;

/**
 * A set of commonly used delimiters for {@link DelimiterBasedFrameDecoder}.
 */
public final class Delimiters {

    /**
     * Returns a {@code NUL (0x00)} delimiter, which could be used for
     * Flash XML socket or any similar protocols.
     */
    public static ByteBuf[] nulDelimiter() {
        return new ByteBuf[] {
                Unpooled.wrappedBuffer(new byte[] { 0 }) };
    }

    /**
     * Returns {@code CR ('
')} and {@code LF ('
')} delimiters, which could
     * be used for text-based line protocols.
     */
    public static ByteBuf[] lineDelimiter() {
        return new ByteBuf[] {
                Unpooled.wrappedBuffer(new byte[] { '
', '
' }),
                Unpooled.wrappedBuffer(new byte[] { '
' }),
        };
    }

    private Delimiters() {
        // Unused
    }
}