HttpClient是HTTP客户端的接口。HttpClient封装了各种对象，处理cookies，身份认证，连接管理等。
概念
HttpClient的使用一般包含下面6个步骤：
创建 HttpRequest 的实例；设置某种连接方法的类型（GET、POST等），这里通过setUrl传入待连接的地址；设置响应回调函数，读取response；添加请求到HttpClient任务队列；释放连接。无论执行方法是否成功，都必须释放连接；对得到后的内容进行处理。
如何使用
引入头文件和命名空间
#include "network/HttpClient.h"
using namespace cocos2d::network;
HttpRequest 实例
我们将使用HttpRequest无参数的构造函数，它为大多数情况提供了一个很好的默认设置，所以我们使用它。
HttpRequest* request = new HttpRequest();
设置连接方法的类型和待连接的地址
由HTTP规范定义的各种方法对应各种不同的HttpRequest类。
我们将使用Get方法，这是一个简单的方法，它只是简单地取得一个URL，获取URL指向的文档。
request->setRequestType(HttpRequest::Type::GET);
request->setUrl("http://www.httpbin.org/get");
设置回调
无论服务器返回怎样的状态，响应主体response body总是可读的，这至关重要。
request->setResponseCallback(CC_CALLBACK_2(HelloWorld::onHttpComplete,this));
在onHttpComplete里读取响应数据：
std::vector<char> *buffer = response->getResponseData();//Get the request data pointer back
添加请求到HttpClient任务队列
cocos2d::network::HttpClient::getInstance()->send(request);
释放连接
这是一个可以让整个流程变得完整的关键步骤, 我们必须告诉HttpClient，我们已经完成了连接，并且它现在可以重用。如果不这样做的话，HttpClient将无限期地等待一个连接释放，以便它可以重用。
要释放连接，使用:
request->release();
处理响应
现在，我们已经完成了与HttpClient的交互，可以集中精力做我们需要处理的数据。在这个例子中，我们仅仅将它在控制台上输出。
// dump data
std::vector *buffer = response->getResponseData();
printf("Http Test, dump data: ");
for (unsigned int i = 0; i < buffer->size(); i++)
{
printf("%c", (*buffer)[i]);
}
printf("\n");
如果你需要把response作为一个流来读取它里面的信息，上面的步骤将会同如何解析这个连接结合，当你处理完所有的数据后，关闭输入流，并释放该连接。
GET请求示例
下面是一个通过HttpClient的HTTP GET请求的例子。
HttpRequest* request = new HttpRequest();
request->setUrl("http://www.baidu.com");
request->setRequestType(HttpRequest::Type::GET);
request->setResponseCallback(CC_CALLBACK_2(HelloWorld::onHttpRequestCompleted,this));
request->setTag("GET test");
cocos2d::network::HttpClient::getInstance()->send(request);
request->release();
POST请求示例
下面将发送一个POST请求到URL“http://httpbin.org/post”。
HttpRequest* request = new HttpRequest();
request->setUrl("http://httpbin.org/post");
request->setRequestType(HttpRequest::Type::POST);
request->setResponseCallback(CC_CALLBACK_2(HelloWorld::onHttpRequestCompleted,this));
// write the post data
const char* postData = "visitor=cocos2d&TestSuite=Extensions Test/NetworkTest";
request->setRequestData(postData, strlen(postData));
request->setTag("POST test");
cocos2d::network::HttpClient::getInstance()->send(request);
request->release();
处理网络回调函数
void HelloWorld::onHttpRequestCompleted(HttpClient *sender, HttpResponse *response)
{
if (!response)
{
return;
}
// You can get original request type from: response->request->reqType
if (0 != strlen(response->getHttpRequest()->getTag()))
{
log("%s completed", response->getHttpRequest()->getTag());
}
int statusCode = response->getResponseCode();
char statusString[64] = {};
sprintf(statusString, "HTTP Status Code: %d, tag = %s", statusCode, response->getHttpRequest()->getTag());
_labelStatusCode->setString(statusString);
log("response code: %d", statusCode);
if (!response->isSucceed())
{
log("response failed");
log("error buffer: %s", response->getErrorBuffer());
return;
}
// dump data
std::vector<char> *buffer = response->getResponseData();
printf("Http Test, dump data: ");
for (unsigned int i = 0; i < buffer->size(); i++)
{
printf("%c", (*buffer)[i]);
}
printf("\n");
}
Android
需要注意的是，如果你是Android环境，不要忘了在您的应用程序的Manifest 中增加相应的权限：
<uses-permission android:name=”android.permission.INTERNET” />
详细代码可参照..\tests\Cpp\TestCpp\Classes\ExtensionsTest\NetworkTest\HttpClientTest.cpp
HttpManager架构
HttpManager.h文件
#pragma once
#include "cocos2d.h"
#include "network/HttpClient.h"
//#include "Core/FV/FvSingleton.h"
USING_NS_CC;
using namespace network;
using namespace std;
class HttpManagerDelegate
{
public:
virtual void onHttpManagerRequestCompleted(HttpClient* sender,HttpResponse* response) = 0;
};
class HttpManager //: public FvSingleton<HttpManager>
{
public:
HttpManager(void);
~HttpManager(void);
CC_SYNTHESIZE(HttpManagerDelegate*,_httpManagerDelegate,HttpDelegate);
//等价于 HttpManagerDelegate* getHttpDelegate(){return _httpManagerDelegate;};
//等价于 void setHttpDelegate(HttpManagerDelegate* delegate){_httpManagerDelegate = delegate;};
//static HttpManager* getInstance();
void sendGetRequest(string url,string requestTag);
void sendPostRequest(string url,string requestTag);
private:
void onHttpRequestCompleted(HttpClient* sender,HttpResponse* response);
//static HttpManager* mHttpManager;
};
HttpManager.cpp文件
#include "HttpManager.h"
//FV_SINGLETON_STORAGE(HttpManager);
//HttpManager* HttpManager::mHttpManager = nullptr;
HttpManager::HttpManager(void)
{
_httpManagerDelegate = nullptr;
HttpClient::getInstance()->setTimeoutForConnect(5);
}
HttpManager::~HttpManager(void)
{
}
HttpManager* HttpManager::getInstance()
{
if (mHttpManager == nullptr)
{
mHttpManager = new HttpManager();
}
return mHttpManager;
}
void HttpManager::sendGetRequest(string url,string requestTag)
{
HttpRequest* request = new (std::nothrow) HttpRequest();
request->setRequestType(HttpRequest::Type::GET);
request->setUrl(url.c_str());
request->setResponseCallback(CC_CALLBACK_2(HttpManager::onHttpRequestCompleted,this));
request->setTag(requestTag.c_str());
HttpClient::getInstance()->send(request);
request->release();
}
void HttpManager::sendPostRequest(string url,string requestTag)
{
HttpRequest* request = new (std::nothrow) HttpRequest();
request->setRequestType(HttpRequest::Type::POST);
request->setUrl(url.c_str());
request->setResponseCallback(CC_CALLBACK_2(HttpManager::onHttpRequestCompleted,this));
request->setTag(requestTag.c_str());
request->setRequestData("",0);
HttpClient::getInstance()->send(request);
request->release();
}
void HttpManager::onHttpRequestCompleted(HttpClient* sender,HttpResponse* response)
{
if (!response)
{
return;
}
const char* tag = response->getHttpRequest()->getTag();
if (0 != strlen(tag))
{
log("%s completed",tag);
}
log("HTTP Status Code::%ld, tag = %s",response->getResponseCode(),tag);
//if (!response->isSucceed())
//{
// log("response failed");
// log("error buffer:%s",response->getErrorBuffer());
// mMapCallBack.erase(tag);
// return;
//}
if (_httpManagerDelegate)
{
_httpManagerDelegate->onHttpManagerRequestCompleted(sender,response);
}
}
BLLHttpTest.h文件
#pragma once
#include "Core/FV/FvSingleton.h"
#include "Core/Network/HttpManager.h"
using namespace std;
class BLLHttpTest : public HttpManagerDelegate//,public FvSingleton<BLLHttpTest>
{
public:
BLLHttpTest(void);
~BLLHttpTest(void);
static BLLHttpTest* getInstance();
typedef std::function<void(string responseData,const char* tag)> onResponseCallBack;
void sendGetRequest(string url,string requestTag,onResponseCallBack cb);
void sendPostRequest(string url,string requestTag,onResponseCallBack cb);
virtual void onHttpManagerRequestCompleted(HttpClient* sender,HttpResponse* response);
private:
void onHttpRequestCompletedDataHandle(string data,string tag);
std::map<string, onResponseCallBack> mMapCallBack;
static BLLHttpTest* mBLLHttpTest;
HttpManager* mHttpManager;
};
BLLHttpTest.cpp文件
#include "BLLHttpTest.h"
//FV_SINGLETON_STORAGE(BLLHttpTest);
BLLHttpTest* BLLHttpTest::mBLLHttpTest = nullptr;
BLLHttpTest::BLLHttpTest(void)
{
mHttpManager = new HttpManager();
mHttpManager->setHttpDelegate(this);
}
BLLHttpTest::~BLLHttpTest(void)
{
}
BLLHttpTest* BLLHttpTest::getInstance()
{
if (!mBLLHttpTest)
{
mBLLHttpTest = new BLLHttpTest();
}
return mBLLHttpTest;
}
void BLLHttpTest::sendGetRequest(string url,string requestTag,onResponseCallBack cb)
{
mMapCallBack[requestTag] = cb;
mHttpManager->sendGetRequest(url,requestTag);
}
void BLLHttpTest::sendPostRequest(string url,string requestTag,onResponseCallBack cb)
{
mMapCallBack[requestTag] = cb;
mHttpManager->sendPostRequest(url,requestTag);
}
void BLLHttpTest::onHttpManagerRequestCompleted(HttpClient* sender,HttpResponse* response)
{
const char* tag = response->getHttpRequest()->getTag();
if (!response->isSucceed())
{
log("response failed");
log("error buffer:%s",response->getErrorBuffer());
mMapCallBack.erase(tag);
return;
}
std::vector<char> *buffer = response->getResponseData();
string temp = "";
for (unsigned int i = 0; i < buffer->size(); i++)
{
temp +=(*buffer)[i];
}
log("Http Test, dump data:%s\n",temp.c_str());
if (mMapCallBack[tag])
{
onHttpRequestCompletedDataHandle(temp,tag);
mMapCallBack[tag](temp,tag);
mMapCallBack.erase(tag);
}
}
void BLLHttpTest::onHttpRequestCompletedDataHandle(string data,string tag)
{
}
几乎所有的架构中，涉及到回调函数，都会把回调函数封装成一个纯虚类，子类继承这个纯虚类并实现纯虚函数。然后在子类的构造函数中，将自己给设置成代理。这HttpManager架构运用了Bridge桥接设计模式
