SOCKET
的封裝
C++
通用框架的設(shè)計(jì)
作者：
naven
1??????????
SOCKET
封裝介紹
Socket
通訊程序估計(jì)現(xiàn)在大多數(shù)應(yīng)用系統(tǒng)都會(huì)涉及到，因?yàn)楝F(xiàn)在的世界是一個(gè)由
Internet
網(wǎng)絡(luò)連接的世界，任何個(gè)人電腦或服務(wù)都可能會(huì)有數(shù)據(jù)交換，通過(guò)
TCP/UDP
這樣的
Socket
通訊協(xié)議進(jìn)行聯(lián)系。開(kāi)發(fā)這樣的通訊程序會(huì)是很普遍也很類(lèi)似，每種操作系統(tǒng)都實(shí)現(xiàn)了
Socket
通訊庫(kù)并提供很相似的
API
，通訊步驟都遵循
RFC
規(guī)范。但是有些
API
的具體接口卻稍有不同，比如
Socket IO API
在
win32
系統(tǒng)和
Unix
系統(tǒng)就不一樣，
Win32
用
recv/send
而
Unix
使用標(biāo)準(zhǔn)統(tǒng)一的
read/write
，而且
socket
句柄在不同操作系統(tǒng)處理也不一樣，等等這些都造成編寫(xiě)跨平臺(tái)的
Socket
應(yīng)用不太容易。另外編寫(xiě)服務(wù)器和客戶(hù)端的處理步驟也很繁瑣，
IP
地址和域名的轉(zhuǎn)換也很麻煩，所以實(shí)現(xiàn)一個(gè)標(biāo)準(zhǔn)統(tǒng)一使用更簡(jiǎn)潔的
API
非常有用。本
C++
框架基本參考
Java
的
Socket
相關(guān)類(lèi)實(shí)現(xiàn)了類(lèi)似封裝，除了
ServerSocket
實(shí)現(xiàn)稍有不同，其他原理和方法基本類(lèi)似。用它編寫(xiě)網(wǎng)絡(luò)應(yīng)用基本不用考慮底層的協(xié)議處理，使用非常容易，代碼也更簡(jiǎn)潔易讀。
?
主要有如下一些類(lèi)
?
class Socket ?????????????????????? ???????????????????????????
代表一個(gè)
TCP
連接的
Socket
對(duì)象
???????? class DatagramSocket???????????????????????????????????
代表一個(gè)
UDP
連接的
Socket
對(duì)象（暫未實(shí)現(xiàn)）
???????? class MulticastSocket???????????????????????????????????
一個(gè)
DatagramSocket
的子類(lèi)用于多播（暫未實(shí)現(xiàn)）
class SocketAcceptor???????????????????????????????????
一個(gè)
TCP
服務(wù)端的接收器
class SocketConnector?????????????????????????????????
一個(gè)
TCP
客戶(hù)端的連接器
???????? class SocketInputStream??????????????????????????????
一個(gè)
Socket
連接的輸入流
???????? class SocketOutputStream???????????????????????????
一個(gè)
Socket
連接的輸出流
???????? class SocketReader???????????????????????????????????????
一個(gè)
Socket
連接的讀操作器
???????? class SocketWriter?????????????????????????????????????????
一個(gè)
Socket
連接的寫(xiě)操作器
?
Socket
的意思是在網(wǎng)絡(luò)的機(jī)器之間建立一個(gè)通信線(xiàn)路。通過(guò)
TCP Sockets
發(fā)送或接收的操作時(shí)通過(guò)
InputStream
和
OutputStream
流處理的，
Socket
類(lèi)的
getInputStream
和
getOutputStream
可以取得該
Socket
連接的輸入
/
輸出流對(duì)象。
SocketAcceptor
是用于服務(wù)器端的接收器，它處于接收的狀態(tài)時(shí)會(huì)阻塞，直到接收到客戶(hù)端的連接請(qǐng)求，這時(shí)就會(huì)創(chuàng)建一個(gè)
Socket
對(duì)象代表該服務(wù)器到此客戶(hù)端的連接。而對(duì)應(yīng)的
SocketConnector
是用于客戶(hù)端的連接器，它向服務(wù)端發(fā)出連接請(qǐng)求，如果服務(wù)器允許連接，則也同時(shí)建立一個(gè)
Socket
對(duì)象表示它到服務(wù)器端的連接，這時(shí)就可以獲取輸入
/
輸出流對(duì)象進(jìn)行
Socket
通訊了。
2??????????
Hello World!
下面的程序示例如何用上面的類(lèi)進(jìn)行
Scoket
通訊：
這是服務(wù)端的實(shí)現(xiàn)
void
?servertest()?
{
????
//
?定義一個(gè)接收器綁定?8000?端口
????SocketAcceptor?sa(
8000
);?
????
while
(
1
)?
{
???????
//
?阻塞等待連接請(qǐng)求
????????Socket?sk?
=
?sa.accept();?
????????
//
?獲取此連接的讀操作器和寫(xiě)操作器
????????Reader?
&
rd?
=
?sk.getReader();?
????????Writer?
&
wr?
=
?sk.getWriter();?
????????String?s;?
????????
//
?從客戶(hù)端讀取?10?個(gè)字節(jié)
????????rd.read(s,?
10
);?
????????
//
?向客戶(hù)端寫(xiě)信息
????????wr.write(“read?ok”);?
????????
//
?關(guān)閉連接
????????sk.close();?
}
}
這是客戶(hù)端的實(shí)現(xiàn)
void
?clienttest()
{
????
//
?定義一個(gè)連接器
SocketConnector?sc;?
//
?連接指定的服務(wù)器地址及端口,?返回一個(gè)Socket對(duì)象
Socket?sk?
=
?sc.connect(“l(fā)ocalhost”,?
8000
);?
//
?如果已成功連上
????
if
(?sk.isConnected()?)?
{
????
//
?獲取此連接的讀操作器和寫(xiě)操作器
????????Reader
&
?reader?
=
?sk.getReader();?
????????Writer
&
?writer?
=
?sk.getWriter();?
????????
//
?可以在讀操作器上建立一個(gè)帶緩沖的讀操作器
????????BufferedReader?rd(reader);
????????
//
?向服務(wù)器發(fā)送信息
????????writer.write(“hello?server”);
????????
//
?接收信息,?帶緩沖的讀操作器可以讀取一行
????????rd.readLine(s);
????????
//
?關(guān)閉連接
????????sk.close();
????}
}
1??????????
Socket
類(lèi)
此類(lèi)定義一個(gè)表示
Socket
連接的類(lèi)，一個(gè)
Socket
是一個(gè)為在兩臺(tái)機(jī)器間通信的端點(diǎn)。一個(gè)
Socket
類(lèi)的真實(shí)行為是通過(guò)一個(gè)
SocketImpl
類(lèi)的詩(shī)體執(zhí)行的。一個(gè)應(yīng)用程序可以通過(guò)改變
Socket Factory
來(lái)創(chuàng)建
Socket
的具體實(shí)現(xiàn)，以適應(yīng)本地的局域網(wǎng)防火墻。
Socket
類(lèi)成員和主要接口定義如下：
?
class
?Socket?:?
public
?AbstractFile?
{
protected
:?
????
/**/
/*
*
?????*?The?implementation?of?this?Socket.
?????
*/
????SocketImplAutoPtr?_impl;?
????
/**/
/*
*
?????*?Various?states?of?this?socket.
?????
*/
????BOOL?_connected;?
????BOOL?_closed;?
????BOOL?_shutIn;?
BOOL?_shutOut;
public
:?
????
/**/
/*
*
?????*?Creates?an?unconnected?socket,?with?the
?????*?system-default?type?of?SocketImpl.
?????
*/
Socket();
????
/**/
/*
*
?????*?Returns?an?input?stream?for?this?socket.
?????*
?????*?@return?????an?input?stream?for?reading?bytes?from?this?socket.
?????
*/
????InputStream
&
?getInputStream();
????
/**/
/*
*
?????*?Gets?an?Reader?for?this?socket.
?????
*/
????Reader
&
?getReader();
????
/**/
/*
*
?????*?Returns?an?output?stream?for?this?socket.
?????*
?????*?@return?????an?output?stream?for?writing?bytes?to?this?socket.
?????
*/
????OutputStream
&
?getOutputStream();
????
/**/
/*
*
?????*?Gets?an?Writer?for?this?socket.
?????
*/
????Writer
&
?getWriter();?
????
/**/
/*
*
?????*?Enable/disable?the?option?specified?by?<I>optID</I>.??If?the?option
?????*?is?to?be?enabled,?and?it?takes?an?option-specific?"optval",??this?is
?????*?passed?in?<I>value</I>.??The?actual?type?of?value?is?option-specific,
?????*?and?it?is?an?error?to?pass?something?that?isn't?of?the?expected?type:
?????*?<BR>
?????*
?????*?@param?optID?identifies?the?option
?????*?@param?level?[in]?Level?at?which?the?option?is?defined;?the?supported?levels?
?????*??????????????include?SOL_SOCKET?and?IPPROTO_TCP.?
?????*?@param?optval?[in]?Pointer?to?the?buffer?in?which?the?value?for?the?requested?
?????*??????????????option?is?to?be?returned.
?????*?@param?optlen?[in]?Pointer?to?the?size?of?the?optval?buffer,?in?bytes.?
?????*?@return?0?If?no?error?occurs,?Otherwise,?a?value?of?SOCKET_ERROR(-1)?is?returned,?
?????*??????????and?a?specific?error?code?can?be?retrieved?by?socketerrno.
?????*?@see?#getOption(int)
?????
*/
????
int
?setOption(
int
?optID,?
int
?level,?
const
?
void
?
*
optval,?
int
?optlen);
????
/**/
/*
*
?????*?Fetch?the?value?of?an?option.
?????*?Binary?options?will?return?java.lang.Boolean(true)
?????*?if?enabled,?java.lang.Boolean(false)?if?disabled,?e.g.:
?????*?<BR>
?????*
?????*?@param?optID?an?<code>int</code>?identifying?the?option?to?fetch
?????*?@param?level?[in]?Level?at?which?the?option?is?defined;?the?supported?levels?
?????*??????????????include?SOL_SOCKET?and?IPPROTO_TCP.?
?????*?@param?optval?[out]?Pointer?to?the?buffer?in?which?the?value?for?the?requested?
?????*??????????????option?is?to?be?returned.
?????*?@param?optlen?[in,?out]?Pointer?to?the?size?of?the?optval?buffer,?in?bytes.?
?????*?@return?0?If?no?error?occurs,?Otherwise,?a?value?of?SOCKET_ERROR(-1)?is?returned,?
?????*??????????and?a?specific?error?code?can?be?retrieved?by?socketerrno.
?????*?@see?#setOption(int,?java.lang.Object)
?????
*/
????
int
?getOption(
int
?optID,?
int
?level,?
void
?
*
optval,?
int
?
*
optlen);
????
/**/
/*
*
?????*?Closes?this?socket.
?????*?<p>
?????*?Any?thread?currently?blocked?in?an?I/O?operation?upon?this?socket
?????*?will?throw?a?{@link?SocketException}.
?????*?<p>
?????*?Once?a?socket?has?been?closed,?it?is?not?available?for?further?networking
?????*?use?(i.e.?can't?be?reconnected?or?rebound).?A?new?socket?needs?to?be
?????*?created.
?????*
?????*?<p>?If?this?socket?has?an?associated?channel?then?the?channel?is?closed
?????*?as?well.
?????*
?????
*/
????
void
?close();
}
;
?
1?????????? SocketAcceptor類(lèi)
此類(lèi)實(shí)現(xiàn)一個(gè)用于服務(wù)器端接收連接的類(lèi)。一個(gè)SocketAcceptor對(duì)象等待來(lái)自網(wǎng)絡(luò)的連接請(qǐng)求，它執(zhí)行一些基于請(qǐng)求的操作，并且可能返回一些信息給請(qǐng)求者。連接成功后SocketAcceptor會(huì)生成一個(gè)Socket對(duì)象用于網(wǎng)絡(luò)通訊。
SocketAcceptor類(lèi)成員和主要接口定義如下：
?
class?SocketAcceptor
{
protected:?
????/**//**
?????*?The?factory?for?all?server?sockets.
?????*/
????static?SocketImplFactoryAutoPtr?_factory;?
????/**//**
?????*?The?implementation?of?this?Socket.
?????*/
????SocketImplAutoPtr?_impl;?
????/**//**
?????*?Various?states?of?this?socket.
?????*/
????BOOL?_bound;?
????BOOL?_created;?
????BOOL?_closed;?
????BOOL?_stream;?
public:?
????/**//**
?????*?Creates?a?socket?acceptor?with?default?stream?type.
?????*?<p>
?????*/
????SocketAcceptor();?
????/**//**
?????*?Creates?a?socket?acceptor?with?specified?stream?type,?
?????*?bound?to?the?specified?port?and?host.?A?port?of?
?????*?<code>0</code>?creates?a?socket?on?any?free?port.?
?????*?<p>
?????*?The?maximum?queue?length?for?incoming?connection?indications?(a?
?????*?request?to?connect)?is?set?to?<code>50</code>.?If?a?connection?
?????*?indication?arrives?when?the?queue?is?full,?the?connection?is?refused.
?????*?<p>
?????*?If?the?application?has?specified?a?server?socket?factory,?that?
?????*?factory's?<code>createSocketImpl</code>?method?is?called?to?create?
?????*?the?actual?socket?implementation.?Otherwise?a?"plain"?socket?is?created.
?????*?<p>
?????*
?????*?@param??????host?the?host?address?the?server?will?bind?to
?????*?@param??????port??the?port?number,?or?<code>0</code>?to?use?any
?????*???????????????????free?port.
?????*?@param??????stream????if?<code>true</code>,?create?a?stream?socket;
?????*???????????????????????otherwise,?create?a?datagram?socket.
?????*?@param??????backlog?the?listen?backlog
?????*/
SocketAcceptor(const?String?&host,?int?port,?BOOL?stream?=?TRUE);
????/**//**
?????*?Binds?the?<code>ServerSocket</code>?to?a?local?address
?????*?(IP?address?and?port?number).
?????*?<P>
?????*?The?<code>backlog</code>?argument?must?be?a?positive
?????*?value?greater?than?0.?If?the?value?passed?if?equal?or?less
?????*?than?0,?then?the?default?value?will?be?assumed.
?????*?@param?port?the?local?TCP?port
?????*?@param?backlog?the?listen?backlog
?????*?@return?0?If?no?error?occurs,?Otherwise,?a?value?of?
?????*??????????SOCKET_ERROR(-1)?is?returned
?????*/
????int?bind(int?port,?int?backlog?=?LISTENQ);
????/**//**
?????*?Listens?for?a?connection?to?be?made?to?this?socket?and?accepts?
?????*?it.?The?method?blocks?until?a?connection?is?made.?
?????*
?????*?<p>A?new?Socket?<code>s</code>?is?created?and,?if?there?
?????*?is?a?security?manager,?
?????*?the?security?manager's?<code>checkAccept</code>?method?is?called
?????*?with?<code>s.getInetAddress().getHostAddress()</code>?and
?????*?<code>s.getPort()</code>
?????*
?????*?@param?timeout??timeout?to?accept?in?ms.?
?????*?@return?the?new?Socket
?????*/
????Socket?accept(int?timeout);?
????/**//**
?????*?Closes?this?socket?acceptor.
?????*?<p>
?????*?Any?thread?currently?blocked?in?an?I/O?operation?upon?this?socket
?????*?will?throw?a?{@link?SocketException}.
?????*?<p>
?????*?Once?a?socket?has?been?closed,?it?is?not?available?for?further?networking
?????*?use?(i.e.?can't?be?reconnected?or?rebound).?A?new?socket?needs?to?be
?????*?created.
?????*
?????*?<p>?If?this?socket?has?an?associated?channel?then?the?channel?is?closed
?????*?as?well.
?????*
?????*/
????void?close();
};
1?????????? SocketConnector類(lèi)
此類(lèi)實(shí)現(xiàn)一個(gè)用于客戶(hù)器端連接服務(wù)的類(lèi)。一個(gè)SocketConnector對(duì)象可以向指定的服務(wù)地址和端口發(fā)出的連接請(qǐng)求，它執(zhí)行一些基于請(qǐng)求的操作，并且可能返回一些信息。連接成功后SocketConnector會(huì)生成一個(gè)Socket對(duì)象用于網(wǎng)絡(luò)通訊。
SocketConnector類(lèi)成員和主要接口定義如下：
class?SocketConnector
{
protected:?
????/**//**
?????*?The?factory?for?all?server?sockets.
?????*/
????static?SocketImplFactoryAutoPtr?_factory;?
????/**//**
?????*?The?implementation?of?this?Socket.
?????*/
????SocketImplAutoPtr?_impl;?
????/**//**
?????*?Various?states?of?this?socket.
?????*/
????BOOL?_bound;?
????BOOL?_created;?
????BOOL?_closed;?
????BOOL?_stream;;?
public:?
????/**//**
?????*?Creates?a?socket?connector?with?specified?stream?type.
?????*?default?is?Creates?a?stream?socket?connector.?
?????*?<p>
?????*
?????*?@param??????stream????if?<code>true</code>,?create?a?stream?socket;
?????*???????????????????????otherwise,?create?a?datagram?socket.
?????*/
????SocketConnector(BOOL?stream?=?TRUE);
????/**//**
?????*?Creates?a?socket?and?connects?it?to?the?specified?port?on
?????*?the?specified?host.
?????*?@param?host?the?specified?host
?????*?@param?port?the?specified?port
?????*?@param?timeout?the?timeout?value?in?milliseconds,?or?zero?for?no?timeout.
?????*??????????-1?will?use?default?timeout.
?????*?@return?the?new?Socket
?????*/
Socket?connect(const?String?&host,?int?port,?int?timeout?=?-1);
????/**//**
?????*?Closes?this?socket?connector.
?????*?<p>
?????*?Any?thread?currently?blocked?in?an?I/O?operation?upon?this?socket
?????*?will?throw?a?{@link?SocketException}.
?????*?<p>
?????*?Once?a?socket?has?been?closed,?it?is?not?available?for?further?networking
?????*?use?(i.e.?can't?be?reconnected?or?rebound).?A?new?socket?needs?to?be
?????*?created.
?????*
?????*?<p>?If?this?socket?has?an?associated?channel?then?the?channel?is?closed
?????*?as?well.
?????*
?????*/
????void?close();
};
1?????????? SocketInputStream類(lèi)
這個(gè)類(lèi)類(lèi)似與其他InputStream如FileInputStream類(lèi)，是InputStream接口類(lèi)的一個(gè)實(shí)現(xiàn)，執(zhí)行Socket流的讀取操作，實(shí)現(xiàn)的接口均是最基礎(chǔ)的操作，如讀取一個(gè)byte字節(jié)的數(shù)據(jù)，或者讀取指定長(zhǎng)度的數(shù)據(jù)。
SocketInputStream類(lèi)成員和主要接口定義如下：
class?SocketInputStream?:?public?InputStream
{
protected:?
????/**//**
?????*?Pointer?to?the?implementation?of?this?SocketImpl.
?????*/
????PlainSocketImpl?*_impl;?
????/**//**
?????*?Pointer?to?the?implementation?of?this?Socket.
?????*/
????Socket?*_socket;?
????BOOL?_eof;?
BOOL?_closing;
????/**//**
?????*?Creates?a?new?SocketInputStream.?Can?only?be?called
?????*?by?a?Socket.?This?method?needs?to?hang?on?to?the?owner?Socket?so
?????*?that?the?fd?will?not?be?closed.
?????*?@param?impl?the?implemented?socket?input?stream
?????*/
????SocketInputStream(PlainSocketImpl?&impl);
public:?
????/**//**
?????*?Check?current?SocketInputStream?object?if?is?opened.?
?????*
?????*?@return??TRUE?if?opened?else?return?FALSE
?????*/
????BOOL?isOpened();
????/**//**
?????*?Reads?a?byte?of?data?from?this?input?stream.?This?method?blocks
?????*?if?no?input?is?yet?available.
?????*
?????*?@return?????the?next?byte?of?data,?or?<code>-1</code>?if?the?end?of?the
?????*?????????????file?is?reached.
?????*/
????int?read();?
????/**//**
?????*?Reads?up?to?<code>len</code>?bytes?of?data?from?this?input?stream
?????*?into?an?array?of?bytes.?This?method?blocks?until?some?input?is
?????*?available.
?????*
?????*?@param??????b?????the?buffer?into?which?the?data?is?read.
?????*?@param??????off???the?start?offset?of?the?data.
?????*?@param??????len???the?maximum?number?of?bytes?read.
?????*?@return?????the?total?number?of?bytes?read?into?the?buffer,?or
?????*?????????????<code>0</code>?if?there?is?no?more?data?because?the?end?of
?????*?????????????the?file?has?been?reached,?or?-1?if?read?error.
?????*/
????int?read(void?*b,?int?off,?int?len);
????/**//**
?????*?Reads?up?to?<code>len</code>?bytes?of?data?from?this?input?stream
?????*?into?an?array?of?bytes.?This?method?blocks?until?some?input?is
?????*?available.
?????*
?????*?@param??????b?????the?buffer?into?which?the?data?is?read.
?????*?@param??????len???the?maximum?number?of?bytes?read.
?????*?@return?????the?total?number?of?bytes?read?into?the?buffer,?or
?????*?????????????<code>0</code>?if?there?is?no?more?data?because?the?end?of
?????*?????????????the?file?has?been?reached,?or?-1?if?read?error.
?????*/
????int?read(void?*b,?int?len);
????/**//**
?????*?Skips?over?and?discards?<code>n</code>?bytes?of?data?from?the
?????*?input?stream.?The?<code>skip</code>?method?may,?for?a?variety?of
?????*?reasons,?end?up?skipping?over?some?smaller?number?of?bytes,
?????*?possibly?<code>0</code>.?The?actual?number?of?bytes?skipped?is?returned.
?????*
?????*?@param??????n???the?number?of?bytes?to?be?skipped.
?????*?@return?????the?actual?number?of?bytes?skipped.
?????*/
????long?skip(long?n);?
????/**//**
?????*?Returns?the?number?of?bytes?that?can?be?read?from?this?file?input
?????*?stream?without?blocking.
?????*
?????*?@return?????the?number?of?bytes?that?can?be?read?from?this?file?input
?????*?????????????stream?without?blocking.
?????*/
????int?available();?
????/**//**
?????*?Closes?this?file?input?stream?and?releases?any?system?resources
?????*?associated?with?the?stream.
?????*
?????*?<p>?If?this?stream?has?an?associated?channel?then?the?channel?is?closed
?????*?as?well.
?????*/
????void?close();
};
?
1?????????? SocketOutputStream類(lèi)
這個(gè)類(lèi)類(lèi)似與其他OutputStream如FileOutputStream類(lèi)，是OutputStream接口類(lèi)的一個(gè)實(shí)現(xiàn)，執(zhí)行Socket流的寫(xiě)操作，實(shí)現(xiàn)的接口均是最基礎(chǔ)的操作，如寫(xiě)一個(gè)byte字節(jié)的數(shù)據(jù)，或者寫(xiě)指定長(zhǎng)度的數(shù)據(jù)。
SocketOutputStream類(lèi)成員和主要接口定義如下：
?
class?SocketOutputStream?:?public?OutputStream
{
protected:?
????/**//**
?????*?Pointer?to?the?implementation?of?this?SocketImpl.
?????*/
????PlainSocketImpl?*_impl;?
????/**//**
?????*?Pointer?to?the?implementation?of?this?Socket.
?????*/
Socket?*_socket;
????/**//**
?????*?Creates?a?new?SocketOutputStream.?Can?only?be?called
?????*?by?a?Socket.?This?method?needs?to?hang?on?to?the?owner?Socket?so
?????*?that?the?fd?will?not?be?closed.
?????*?@param?impl?the?implemented?socket?input?stream
?????*/
????SocketOutputStream(PlainSocketImpl?&impl);
public:?
????/**//**
?????*?Check?current?SocketInputStream?object?if?is?opened.?
?????*
?????*?@return??TRUE?if?opened?else?return?FALSE
?????*/
????BOOL?isOpened();?
????/**//**
?????*?Report?position?in?output?stream.
?????*/?
long?tellp();
????/**//**
?????*?Writes?the?specified?byte?to?this?file?output?stream.?Implements?
?????*?the?<code>write</code>?method?of?<code>OutputStream</code>.
?????*
?????*?@param?b???the?byte?to?be?written.
?????*/
????SocketOutputStream&?write(int?b);?
????/**//**
?????*?Writes?<code>len</code>?bytes?from?the?specified?byte?array?
?????*?starting?at?offset?<code>off</code>?to?this?file?output?stream.?
?????*
?????*?@param??????b?????the?data.
?????*?@param??????len???the?number?of?bytes?to?write.
?????*/
????SocketOutputStream&?write(const?void?*b,?int?len);?
????/**//**
?????*?Writes?<code>len</code>?bytes?from?the?specified?byte?array?
?????*?starting?at?offset?<code>off</code>?to?this?file?output?stream.?
?????*
?????*?@param??????b?????the?data.
?????*?@param??????off???the?start?offset?in?the?data.
?????*?@param??????len???the?number?of?bytes?to?write.
?????*/
????SocketOutputStream&?write(const?void?*b,?int?off,?int?len);?
????/**//**
?????*?Flushes?this?output?stream?and?forces?any?buffered?
?????*?output?bytes?to?be?written?out.
?????*/
????void?flush();?
????/**//**
?????*?Closes?this?file?out?stream?and?releases?any?system?resources
?????*?associated?with?the?stream.
?????*
?????*?<p>?If?this?stream?has?an?associated?channel?then?the?channel?is?closed
?????*?as?well.
?????*/
????void?close();
};
?
1?????????? SocketReader類(lèi)和SocketWriter類(lèi)
SocketReader類(lèi)實(shí)現(xiàn)了一個(gè)對(duì)Socket流讀設(shè)備即SocketInputStream的讀取器，它實(shí)現(xiàn)了Reader接口類(lèi)的方法，所以具有與其它Reader相同的功能，也可以與其它一些讀操作器如BufferedReader配合使用以達(dá)到一些更高級(jí)的功能。
SocketWriter 類(lèi)則實(shí)現(xiàn)了一個(gè)對(duì)Socket流寫(xiě)設(shè)備即SocketOutputStream的寫(xiě)操作器，它實(shí)現(xiàn)了Writer接口類(lèi)的方法，所以具有與其它Writer相同的功能，如進(jìn)行一些operator <<運(yùn)算符的操作等。
詳細(xì)例子請(qǐng)參考 httptest.cpp 范例程序。
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C++通用框架的設(shè)計(jì)作者：naven 日期：2006-8-10
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