protobuf 是什么？
Protocol buffers是一种编码方法构造的一种有效而可扩展的格式的数据。 谷歌使用其内部几乎RPC协议和文件格式的所有协议缓冲区。
参考文档
http://code.google.com/intl/zh-CN/apis/protocolbuffers/docs/overview.html
API的 参考文档
protobuf 适用的语言
正宗（Google 自己内部用的）的protobuf支持三种语言：Java 、c++和Pyton，很遗憾的是并不支持.Net 或者 Lua 等语言，但社区的力量是不容忽视的，由于protobuf确实比Json、XML有速度上的优势和使用的方便，并且可以做到向前兼容、向后兼容等众多特点，所以protobuf社区又弄了个protobuf.net的组件并且还支持众多语言，详细可以看这个链接：http://code.google.com/p/protobuf/wiki/ThirdPartyAddOns，具体某种语言的使用请各自对号入座，本篇只是讲使用android 与c++服务器通讯（测试过）或者与PC 通讯，使用java与C#之间互相通讯方面的DEMO，方面读者做参考。
使用protobuf协议
定义protobuf协议
定义protobuf协议必须创建一个以.proto为后缀的文件，以本篇为例，本篇创建了一个叫msg.proto的消息文件，内容如下：
package msginfo;
message CMsg
{
required string msghead = 1 ;
required string msgbody = 2 ;
}
message CMsgHead
{
required int32 msglen = 1 ;
required int32 msgtype = 2 ;
required int32 msgseq = 3 ;
required int32 termversion = 4 ;
required int32 msgres = 5 ;
required string termid = 6 ;
}
message CMsgReg
{
optional int32 area = 1 ;
optional int32 region = 2 ;
optional int32 shop = 3 ;
optional int32 ret = 4 ;
optional string termid = 5 [defalut = " 12345 " ];
}
message CMsgLogin
{
optional int32 ret = 1 ;
}
message CMsgLogout
{
optional int32 ret = 1 ;
message CMsg
{
required string msghead = 1 ;
required string msgbody = 2 ;
}
message CMsgHead
{
required int32 msglen = 1 ;
required int32 msgtype = 2 ;
required int32 msgseq = 3 ;
required int32 termversion = 4 ;
required int32 msgres = 5 ;
required string termid = 6 ;
}
message CMsgReg
{
optional int32 area = 1 ;
optional int32 region = 2 ;
optional int32 shop = 3 ;
optional int32 ret = 4 ;
optional string termid = 5 [defalut = " 12345 " ];
}
message CMsgLogin
{
optional int32 ret = 1 ;
}
message CMsgLogout
{
optional int32 ret = 1 ;
}
package在Java里面代表这个文件所在的包名，在c#里面代表该文件的命名空间，message代表一个类，
required 代表该字段必填，optional 代表该字段可选，并可以为其设置默认值，默认值格式 ：[defalut=字符串就是"123" ,整型就是 123]。
如何编译该proto文件
java或android 使用的编译方法
正宗的proto可以在Linux下编译也有提供win版编译，由于Linux下编译要配置什么g++呀，之类的有点麻烦，之前做的步骤都忘得差不多，那还是回到win版编译吧，而net 版则是需要在win版下编译。
正宗google 的protobuf 下载列表请参照：http://code.google.com/p/protobuf/downloads/list ，选择其中的win版本下载。解压后会得到一个protoc.exe 文件，此时就可以开始编译了，先以java 为例，编译的步骤如下：
- cmd 打开命令工具
- 以我电脑为例，该exe 文件我放在F:\protoc 目录下，先cd 到该目录 cd F:\protoc
- 再次进入目录后会发现该目录多了一个文件夹，即以该proto的package命名的的目录，会产生一个Msg.java的文件，这时这个文件就可以使用到我们的java或者 android 工程了。
- 最后一步下载一个protobuf-java-2.3.0.jar的jar 包引用到你的java和android工程 里面，OK。可以使用你的protobuf了。如下图：
c#或者以后的Windows Phone 7 使用的编译方法：
.net 版的protobuf来源于proto社区，有两个版本。一个版本叫protobuf-net，官方站点：http://code.google.com/p/protobuf-net/ 写法上比较符合c#一贯的写法。另一个版本叫protobuf-csharp-sport ，
官方站点：http://code.google.com/p/protobuf-csharp-port/ 写法上跟java上的使用极其相似，比较遵循Google 的原生态写法，所以做跨平台还是选择第二版本吧。因为你会发现几乎和java的写法没啥两样，本篇也是使用这个版本。
进入该站点，下载你要的win版。 编译步骤如下：
- 将刚才你的proto文件放在你解压出来的目录与protoc.exe 、ProtoGen.exe、ProtoGen.exe.config放于一起。其他文件可以删除或者 备份。
- 还是打开命令行，定位于对应的目录里面，你放proto文件的目录里面。
- 输入：protoc --descriptor_set_out=msg.protobin --include_imports msg.proto
- msg.protobin是要生成的prtobobin文件，可以使用这个bin文件生成cs文件
- 再输入protogen msg.protobin 使用该bin文件生成cs文件，这样你就可以得到该 msg.cs 的CSharp版文件了，同时在VS里面使用要引入Google.ProtocolBuffers.dll。为了方便你可以将其做成一个批处理文件代码如下：
echo on
protoc -- descriptor_set_out = msg.protobin -- include_imports msg.proto
protogen msg.protobin将其另存为.bat文件即可
使用protobuf编译后的文件来进行socket连接
android 与PC
android 做为客户端向PC的Java服务端发送数据，服务端得到数据进行解析，并打印出来 。
客户端代码：
package net.testSocket;
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import socket.exception.SmsClientException;
import socket.exception.SmsObjException;
import msginfo.Msg.CMsg;
import msginfo.Msg.CMsgHead;
import msginfo.Msg.CMsgReg;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.google.protobuf.InvalidProtocolBufferException;
// 客户端的实现
public class TestSocket extends Activity {
private TextView text1;
private Button but1;
Socket socket = null ;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Thread desktopServerThread=new Thread(new AndroidServer());
// desktopServerThread.start();
setContentView(R.layout.main);
text1 = (TextView) findViewById(R.id.text1);
but1 = (Button) findViewById(R.id.but1);
but1.setOnClickListener( new Button.OnClickListener() {
@Override
public void onClick(View v) {
try {
socket = new Socket( " 192.168.1.116 " , 12345 );
// 得到发送消息的对象
CMsgHead head = CMsgHead.newBuilder().setMsglen( 5 )
.setMsgtype( 1 ).setMsgseq( 3 ).setTermversion( 41 )
.setMsgres( 5 ).setTermid( " 11111111 " ).build();
// body
CMsgReg body = CMsgReg.newBuilder().setArea( 22 )
.setRegion( 33 ).setShop( 44 ).build();
// Msg
CMsg msg = CMsg.newBuilder()
.setMsghead(head.toByteString().toStringUtf8())
.setMsgbody(body.toByteString().toStringUtf8())
.build();
// 向服务器发送信息
msg.writeTo(socket.getOutputStream());
// 接受服务器的信息
InputStream input = socket.getInputStream();
byte [] by = recvMsg(input);
setText(CMsg.parseFrom(by));
input.close();
socket.close();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
System. out .println(e.toString());
}
// };
// }.start();
}
});
}
/* *
* 接收server的信息
*
* @return
* @throws SmsClientException
* @author fisher
*/
public byte [] recvMsg(InputStream inpustream) throws SmsObjException {
try {
byte len[] = new byte [ 1024 ];
int count = inpustream.read(len);
byte [] temp = new byte [count];
for ( int i = 0 ; i < count; i ++ ) {
temp[i] = len[i];
}
return temp;
} catch (Exception localException) {
throw new SmsObjException( " SmapObj.recvMsg() occur exception! "
+ localException.toString());
}
}
/* *
* 得到返回值添加到文本里面
*
* @param g
* @throws InvalidProtocolBufferException
*/
public void setText(CMsg g) throws InvalidProtocolBufferException {
CMsgHead h = CMsgHead.parseFrom(g.getMsghead().getBytes());
StringBuffer sb = new StringBuffer();
if (h.hasMsglen())
sb.append( " ==len=== " + h.getMsglen() + " \n " );
if (h.hasMsgres())
sb.append( " ==res=== " + h.getMsgres() + " \n " );
if (h.hasMsgseq())
sb.append( " ==seq=== " + h.getMsgseq() + " \n " );
if (h.hasMsgtype())
sb.append( " ==type=== " + h.getMsgtype() + " \n " );
if (h.hasTermid())
sb.append( " ==Termid=== " + h.getTermid() + " \n " );
if (h.hasTermversion())
sb.append( " ==Termversion=== " + h.getTermversion() + " \n " );
CMsgReg bo = CMsgReg.parseFrom(g.getMsgbody().getBytes());
if (bo.hasArea())
sb.append( " ==area== " + bo.getArea() + " \n " );
if (bo.hasRegion())
sb.append( " ==Region== " + bo.getRegion() + " \n " );
if (bo.hasShop())
sb.append( " ==shop== " + bo.getShop() + " \n " );
if (bo.hasRet())
sb.append( " ==Ret== " + bo.getRet() + " \n " );
if (bo.hasTermid())
sb.append( " ==Termid== " + bo.getTermid() + " \n " );
text1.setText(sb.toString());
}
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import socket.exception.SmsClientException;
import socket.exception.SmsObjException;
import msginfo.Msg.CMsg;
import msginfo.Msg.CMsgHead;
import msginfo.Msg.CMsgReg;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.google.protobuf.InvalidProtocolBufferException;
// 客户端的实现
public class TestSocket extends Activity {
private TextView text1;
private Button but1;
Socket socket = null ;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Thread desktopServerThread=new Thread(new AndroidServer());
// desktopServerThread.start();
setContentView(R.layout.main);
text1 = (TextView) findViewById(R.id.text1);
but1 = (Button) findViewById(R.id.but1);
but1.setOnClickListener( new Button.OnClickListener() {
@Override
public void onClick(View v) {
try {
socket = new Socket( " 192.168.1.116 " , 12345 );
// 得到发送消息的对象
CMsgHead head = CMsgHead.newBuilder().setMsglen( 5 )
.setMsgtype( 1 ).setMsgseq( 3 ).setTermversion( 41 )
.setMsgres( 5 ).setTermid( " 11111111 " ).build();
// body
CMsgReg body = CMsgReg.newBuilder().setArea( 22 )
.setRegion( 33 ).setShop( 44 ).build();
// Msg
CMsg msg = CMsg.newBuilder()
.setMsghead(head.toByteString().toStringUtf8())
.setMsgbody(body.toByteString().toStringUtf8())
.build();
// 向服务器发送信息
msg.writeTo(socket.getOutputStream());
// 接受服务器的信息
InputStream input = socket.getInputStream();
byte [] by = recvMsg(input);
setText(CMsg.parseFrom(by));
input.close();
socket.close();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
System. out .println(e.toString());
}
// };
// }.start();
}
});
}
/* *
* 接收server的信息
*
* @return
* @throws SmsClientException
* @author fisher
*/
public byte [] recvMsg(InputStream inpustream) throws SmsObjException {
try {
byte len[] = new byte [ 1024 ];
int count = inpustream.read(len);
byte [] temp = new byte [count];
for ( int i = 0 ; i < count; i ++ ) {
temp[i] = len[i];
}
return temp;
} catch (Exception localException) {
throw new SmsObjException( " SmapObj.recvMsg() occur exception! "
+ localException.toString());
}
}
/* *
* 得到返回值添加到文本里面
*
* @param g
* @throws InvalidProtocolBufferException
*/
public void setText(CMsg g) throws InvalidProtocolBufferException {
CMsgHead h = CMsgHead.parseFrom(g.getMsghead().getBytes());
StringBuffer sb = new StringBuffer();
if (h.hasMsglen())
sb.append( " ==len=== " + h.getMsglen() + " \n " );
if (h.hasMsgres())
sb.append( " ==res=== " + h.getMsgres() + " \n " );
if (h.hasMsgseq())
sb.append( " ==seq=== " + h.getMsgseq() + " \n " );
if (h.hasMsgtype())
sb.append( " ==type=== " + h.getMsgtype() + " \n " );
if (h.hasTermid())
sb.append( " ==Termid=== " + h.getTermid() + " \n " );
if (h.hasTermversion())
sb.append( " ==Termversion=== " + h.getTermversion() + " \n " );
CMsgReg bo = CMsgReg.parseFrom(g.getMsgbody().getBytes());
if (bo.hasArea())
sb.append( " ==area== " + bo.getArea() + " \n " );
if (bo.hasRegion())
sb.append( " ==Region== " + bo.getRegion() + " \n " );
if (bo.hasShop())
sb.append( " ==shop== " + bo.getShop() + " \n " );
if (bo.hasRet())
sb.append( " ==Ret== " + bo.getRet() + " \n " );
if (bo.hasTermid())
sb.append( " ==Termid== " + bo.getTermid() + " \n " );
text1.setText(sb.toString());
}
}
服务端代码：
package server;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
import msginfo.Msg.CMsg;
import msginfo.Msg.CMsgHead;
import msginfo.Msg.CMsgReg;
public class AndroidServer implements Runnable {
public void run() {
try {
System. out .println( " beign: " );
ServerSocket serverSocket = new ServerSocket( 12345 );
while ( true ) {
System. out .println( " 等待接收用户连接： " );
// 接受客户端请求
Socket client = serverSocket.accept();
DataOutputStream dataOutputStream;
DataInputStream dataInputStream;
try {
InputStream inputstream = client.getInputStream();
dataOutputStream = new DataOutputStream(
client.getOutputStream());
byte len[] = new byte [ 1024 ];
int count = inputstream.read(len);
byte [] temp = new byte [count];
for ( int i = 0 ; i < count; i ++ ) {
temp[i] = len[i];
}
// 协议正文
// CMsg msg = CMsg.parseFrom(temp);
//
//
CMsgHead head = CMsgHead.parseFrom(msg.getMsghead()
.getBytes());
System. out .println( " ==len=== " + head.getMsglen());
System. out .println( " ==res=== " + head.getMsgres());
System. out .println( " ==seq=== " + head.getMsgseq());
System. out .println( " ==type=== " + head.getMsgtype());
System. out .println( " ==Termid=== " + head.getTermid());
System. out .println( " ==Termversion=== "
+ head.getTermversion());
CMsgReg body = CMsgReg.parseFrom(msg.getMsgbody()
.getBytes());
System. out .println( " ==area== " + body.getArea());
System. out .println( " ==Region== " + body.getRegion());
System. out .println( " ==shop== " + body.getShop());
sendProtoBufBack(dataOutputStream);
inputstream.close();
} catch (Exception ex) {
System. out .println(ex.getMessage());
ex.printStackTrace();
} finally {
client.close();
System. out .println( " close " );
}
}
} catch (IOException e) {
System. out .println(e.getMessage());
}
}
public static void main(String[] args) {
Thread desktopServerThread = new Thread( new AndroidServer());
desktopServerThread.start();
}
private byte [] getProtoBufBack() {
// head
CMsgHead head = CMsgHead.newBuilder().setMsglen( 5 )
.setMsgtype( 1 ).setMsgseq( 3 ).setTermversion( 41 )
.setMsgres( 5 ).setTermid( " 11111111 " ).build();
// body
CMsgReg body = CMsgReg.newBuilder().setArea( 22 )
.setRegion( 33 ).setShop( 44 ).build();
// Msg
CMsg msg = CMsg.newBuilder()
.setMsghead(head.toByteString().toStringUtf8())
.setMsgbody(body.toByteString().toStringUtf8())
.build();
return msg.toByteArray();
}
private void sendProtoBufBack(DataOutputStream dataOutputStream) {
byte [] backBytes = getProtoBufBack();
// 协议头部
try {
dataOutputStream.write(backBytes, 0 , backBytes.length);
dataOutputStream.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
}
最后得到的效果：
客户端：
服务端：
protobuf .net版的实现代码如下：
using
System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Google.ProtocolBuffers;
using msginfo;
using System.Text;
using System.Collections;
using System.Collections.Generic;
namespace protobuf_csharp_sport
{
class Program
{
private static ManualResetEvent allDone = new ManualResetEvent( false );
static void Main( string [] args)
{
beginProtocbuf();
}
private static void beginProtocbuf()
{
// 启动服务端
TcpListener server = new TcpListener(IPAddress.Parse( " 127.0.0.1 " ), 12345 );
server.Start();
server.BeginAcceptTcpClient(clientConnected, server);
Console.WriteLine( " SERVER : 等待数据 --- " );
// 启动客户端
ThreadPool.QueueUserWorkItem(runClient);
allDone.WaitOne();
Console.WriteLine( " SERVER : 退出 --- " );
// server.Stop();
}
// 服务端处理
private static void clientConnected(IAsyncResult result)
{
try
{
TcpListener server = (TcpListener)result.AsyncState;
using (TcpClient client = server.EndAcceptTcpClient(result))
{
using (NetworkStream stream = client.GetStream())
{
// 获取
Console.WriteLine( " SERVER : 客户端已连接，数据读取中 --- " );
byte [] myRequestBuffer = new byte [ 1024 ];
int myRequestLength = 0 ;
do
{
myRequestLength = stream.Read(myRequestBuffer, 0 , myRequestBuffer.Length);
}
while (stream.DataAvailable);
CMsg msg = CMsg.ParseFrom(myRequestBuffer.RemoveEmptyByte(myRequestLength));
CMsgHead head = CMsgHead.ParseFrom(Encoding.ASCII.GetBytes(msg.Msghead));
CMsgReg body = CMsgReg.ParseFrom(Encoding.ASCII.GetBytes(msg.Msgbody));
IDictionary < Google.ProtocolBuffers.Descriptors.FieldDescriptor, object > d = head.AllFields;
foreach (var item in d)
{
Console.WriteLine(item.Value.ToString());
}
d = body.AllFields;
Console.WriteLine( " =========================================== " );
foreach (var item in d)
{
Console.WriteLine(item.Value.ToString());
}
Console.WriteLine( " SERVER : 响应成功 --- " );
Console.WriteLine( " SERVER: 关闭连接 --- " );
stream.Close();
}
client.Close();
}
}
finally
{
allDone.Set();
}
}
// 客户端请求
private static void runClient( object state)
{
try
{
CMsgHead head = CMsgHead.CreateBuilder()
.SetMsglen( 5 )
.SetMsgtype( 1 )
.SetMsgseq( 3 )
.SetTermversion( 4 )
.SetMsgres( 5 )
.SetTermid( " 11111111 " )
.Build();
CMsgReg body = CMsgReg.CreateBuilder().
SetArea( 22 )
.SetRegion( 33 )
.SetShop( 44 )
.Build();
CMsg msg = CMsg.CreateBuilder()
.SetMsghead(head.ToByteString().ToStringUtf8())
.SetMsgbody(body.ToByteString().ToStringUtf8())
.Build();
Console.WriteLine( " CLIENT : 对象构造完毕 ... " );
using (TcpClient client = new TcpClient())
{
// client.Connect(new IPEndPoint(IPAddress.Parse("192.168.1.116"), 12345));
client.Connect( new IPEndPoint(IPAddress.Parse( " 127.0.0.1 " ), 12345 ));
Console.WriteLine( " CLIENT : socket 连接成功 ... " );
using (NetworkStream stream = client.GetStream())
{
// 发送
Console.WriteLine( " CLIENT : 发送数据 ... " );
msg.WriteTo(stream);
// 关闭
stream.Close();
}
client.Close();
Console.WriteLine( " CLIENT : 关闭 ... " );
}
}
catch (Exception error)
{
Console.WriteLine( " CLIENT ERROR : {0} " , error.ToString());
}
}
} // end class
public static class ExtensionClass {
public static
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Google.ProtocolBuffers;
using msginfo;
using System.Text;
using System.Collections;
using System.Collections.Generic;
namespace protobuf_csharp_sport
{
class Program
{
private static ManualResetEvent allDone = new ManualResetEvent( false );
static void Main( string [] args)
{
beginProtocbuf();
}
private static void beginProtocbuf()
{
// 启动服务端
TcpListener server = new TcpListener(IPAddress.Parse( " 127.0.0.1 " ), 12345 );
server.Start();
server.BeginAcceptTcpClient(clientConnected, server);
Console.WriteLine( " SERVER : 等待数据 --- " );
// 启动客户端
ThreadPool.QueueUserWorkItem(runClient);
allDone.WaitOne();
Console.WriteLine( " SERVER : 退出 --- " );
// server.Stop();
}
// 服务端处理
private static void clientConnected(IAsyncResult result)
{
try
{
TcpListener server = (TcpListener)result.AsyncState;
using (TcpClient client = server.EndAcceptTcpClient(result))
{
using (NetworkStream stream = client.GetStream())
{
// 获取
Console.WriteLine( " SERVER : 客户端已连接，数据读取中 --- " );
byte [] myRequestBuffer = new byte [ 1024 ];
int myRequestLength = 0 ;
do
{
myRequestLength = stream.Read(myRequestBuffer, 0 , myRequestBuffer.Length);
}
while (stream.DataAvailable);
CMsg msg = CMsg.ParseFrom(myRequestBuffer.RemoveEmptyByte(myRequestLength));
CMsgHead head = CMsgHead.ParseFrom(Encoding.ASCII.GetBytes(msg.Msghead));
CMsgReg body = CMsgReg.ParseFrom(Encoding.ASCII.GetBytes(msg.Msgbody));
IDictionary < Google.ProtocolBuffers.Descriptors.FieldDescriptor, object > d = head.AllFields;
foreach (var item in d)
{
Console.WriteLine(item.Value.ToString());
}
d = body.AllFields;
Console.WriteLine( " =========================================== " );
foreach (var item in d)
{
Console.WriteLine(item.Value.ToString());
}
Console.WriteLine( " SERVER : 响应成功 --- " );
Console.WriteLine( " SERVER: 关闭连接 --- " );
stream.Close();
}
client.Close();
}
}
finally
{
allDone.Set();
}
}
// 客户端请求
private static void runClient( object state)
{
try
{
CMsgHead head = CMsgHead.CreateBuilder()
.SetMsglen( 5 )
.SetMsgtype( 1 )
.SetMsgseq( 3 )
.SetTermversion( 4 )
.SetMsgres( 5 )
.SetTermid( " 11111111 " )
.Build();
CMsgReg body = CMsgReg.CreateBuilder().
SetArea( 22 )
.SetRegion( 33 )
.SetShop( 44 )
.Build();
CMsg msg = CMsg.CreateBuilder()
.SetMsghead(head.ToByteString().ToStringUtf8())
.SetMsgbody(body.ToByteString().ToStringUtf8())
.Build();
Console.WriteLine( " CLIENT : 对象构造完毕 ... " );
using (TcpClient client = new TcpClient())
{
// client.Connect(new IPEndPoint(IPAddress.Parse("192.168.1.116"), 12345));
client.Connect( new IPEndPoint(IPAddress.Parse( " 127.0.0.1 " ), 12345 ));
Console.WriteLine( " CLIENT : socket 连接成功 ... " );
using (NetworkStream stream = client.GetStream())
{
// 发送
Console.WriteLine( " CLIENT : 发送数据 ... " );
msg.WriteTo(stream);
// 关闭
stream.Close();
}
client.Close();
Console.WriteLine( " CLIENT : 关闭 ... " );
}
}
catch (Exception error)
{
Console.WriteLine( " CLIENT ERROR : {0} " , error.ToString());
}
}
} // end class
public static class ExtensionClass {
public static
}
运行的效果：
这样就OK了，之后就可以把java 服务端的IP或端口改成C# IP和服务端的商品一样，或者反过来也是可以的。c++版本经过测试也是可以的。简直是一个爽字。
本文转自 terry_龙 51CTO博客，原文链接：http://blog.51cto.com/terryblog/554930，如需转载请自行联系原作者
