io.netty.handler.codec

类 LineBasedFrameDecoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.handler.codec.ByteToMessageDecoder

io.netty.handler.codec.LineBasedFrameDecoder

所有已实现的接口:

ChannelHandler, ChannelInboundHandler

直接已知子类:

SmtpResponseDecoder

public class LineBasedFrameDecoder
extends ByteToMessageDecoder

A decoder that splits the received ByteBufs on line endings.

Both "\n" and "\r\n" are handled.

The byte stream is expected to be in UTF-8 character encoding or ASCII. The current implementation uses direct byte to char cast and then compares that char to a few low range ASCII characters like '\n' or '\r'. UTF-8 is not using low range [0..0x7F] byte values for multibyte codepoint representations therefore fully supported by this implementation.

For a more general delimiter-based decoder, see DelimiterBasedFrameDecoder.

Users should be aware that used as is, the lenient approach on lone '\n might result on a parser diffenrencial on line based protocols requiring the use of "\r\n" delimiters like SMTP and can result in attacks similar to SMTP smuggling. Validating afterward the end of line pattern can be a possible mitigation.

嵌套类概要

从类继承的嵌套类/接口 io.netty.handler.codec.ByteToMessageDecoder

ByteToMessageDecoder.Cumulator

从接口继承的嵌套类/接口 io.netty.channel.ChannelHandler

ChannelHandler.Sharable

字段概要

从类继承的字段 io.netty.handler.codec.ByteToMessageDecoder

COMPOSITE_CUMULATOR, MERGE_CUMULATOR

构造器概要

构造器

构造器和说明
LineBasedFrameDecoder(int maxLength) Creates a new decoder.
LineBasedFrameDecoder(int maxLength, boolean stripDelimiter, boolean failFast) Creates a new decoder.

方法概要

限定符和类型	方法和说明
protected java.lang.Object	decode(ChannelHandlerContext ctx, ByteBuf buffer) Create a frame out of the ByteBuf and return it.
protected void	decode(ChannelHandlerContext ctx, ByteBuf in, java.util.List<java.lang.Object> out) Decode the from one ByteBuf to an other.

从类继承的方法 io.netty.handler.codec.ByteToMessageDecoder

actualReadableBytes, callDecode, channelInactive, channelRead, channelReadComplete, decodeLast, discardSomeReadBytes, handlerRemoved, handlerRemoved0, internalBuffer, isSingleDecode, setCumulator, setDiscardAfterReads, setSingleDecode, userEventTriggered

从类继承的方法 io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught

从类继承的方法 io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, handlerAdded, isSharable

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 io.netty.channel.ChannelHandler

handlerAdded

构造器详细资料

LineBasedFrameDecoder

public LineBasedFrameDecoder(int maxLength)

Creates a new decoder.

参数:

maxLength - the maximum length of the decoded frame. A TooLongFrameException is thrown if the length of the frame exceeds this value.

LineBasedFrameDecoder

public LineBasedFrameDecoder(int maxLength,
                             boolean stripDelimiter,
                             boolean failFast)

Creates a new decoder.

参数:

maxLength - the maximum length of the decoded frame. A TooLongFrameException is thrown if the length of the frame exceeds this value.

stripDelimiter - whether the decoded frame should strip out the delimiter or not

failFast - If true, a TooLongFrameException is thrown as soon as the decoder notices the length of the frame will exceed maxFrameLength regardless of whether the entire frame has been read. If false, a TooLongFrameException is thrown after the entire frame that exceeds maxFrameLength has been read.

方法详细资料

decode

protected final void decode(ChannelHandlerContext ctx,
                            ByteBuf in,
                            java.util.List<java.lang.Object> out)
                     throws java.lang.Exception

从类复制的说明: ByteToMessageDecoder

Decode the from one ByteBuf to an other. This method will be called till either the input ByteBuf has nothing to read when return from this method or till nothing was read from the input ByteBuf.

指定者:

decode 在类中 ByteToMessageDecoder

参数:

ctx - the ChannelHandlerContext which this ByteToMessageDecoder belongs to

in - the ByteBuf from which to read data

out - the List to which decoded messages should be added

抛出:

java.lang.Exception - is thrown if an error occurs

decode

protected java.lang.Object decode(ChannelHandlerContext ctx,
                                  ByteBuf buffer)
                           throws java.lang.Exception

Create a frame out of the ByteBuf and return it.

参数:

ctx - the ChannelHandlerContext which this ByteToMessageDecoder belongs to

buffer - the ByteBuf from which to read data

返回:

frame the ByteBuf which represent the frame or null if no frame could be created.

抛出:

java.lang.Exception