http客户端-基于boost开发

　　基于BOOST编写的http客户端，作为BOOST开发学习之用。目前支持功能：

http协议，单向链接返回http response code 200
可content type 为text或image下载到本地
仅支持http返回code为200，不支持3XX、4XX等
暂不支持chunk传输，chunk代码待调试
日志文件，提供类ACE的输出方式，如LOG((LOG_DEBUG,"[%T(%t)] test begin %d %s\n"), int_num_2, string_test.c_str());
数据缓冲区，当前为new方式，后续可更改为从boost pool获取
。。。

2 核心代码

2.1 IOServer，提供asio线程环境

 1 #pragma once
 2 #include "boost/serialization/singleton.hpp"
 3 #include "boost/asio.hpp"
 4 #include "boost/thread.hpp"
 5 #include "boost/bind.hpp"
 6 #include "Event.h"
 7 #include "../concurrent/IRunable.h"
 8 #include "SimpleLog.h"
 9 class IO_Server : public IRunable
10 {
11 public:
12     IO_Server(): bExit(false)
13     {
14     }
15     boost::asio::io_service* GetIOS()
16     {
17         return &ios;
18     }
19     void ActiveIOS()
20     {
21         boost::unique_lock<boost::mutex> lock(mu);
22         if (ios.stopped())
23         {
24             cond.notify_one();
25         }
26     }
27     void Exit()
28     {
29         ios.stop();
30         bExit = true;
31     }
32 private:
33     virtual int Run()
34     {
35         LOG((LOG_DEBUG,"[%T(%t)] ios server run ,id = %d\n", boost::this_thread::get_id()));
36         ios.stop();
37         while (1)
38         {
39             // 设置退出线程
40             if (bExit)
41             {
42                 break;
43             }
44             //
45             {
46                 boost::unique_lock<boost::mutex> lock(mu);
47                 if (ios.stopped())
48                 {
49                     cond.wait(mu);
50                 }
51             }
52             if (ios.stopped())
53             {
54                 ios.reset();
55                 ios.run();
56             }
57         }
58         return 0;
59     }
60 private:
61     boost::asio::io_service            ios;    //所有的asio都要有个ios
62     boost::mutex                    mu;
63     boost::condition_variable_any    cond;
64     bool                            bExit;
65 };
66 typedef boost::serialization::singleton<IO_Server> IOS;

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