[网络协议]Qt实现Http请求：get/post

利用Qt提供的类实现向服务器发送post和get请求：

#include <QCoreApplication>
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>

#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonParseError>
#include <QJsonValue>
#include <QString>
#include <QDebug>
#include <QFile>
#include <QDateTime>
#include <QDir>
#include <QThread>

#pragma execution_character_set("utf-8")

void sendPostRequest()
{
    QNetworkAccessManager *m_pHttpMgr = new QNetworkAccessManager();
    //设置url
    QString url = "http://localhost:80/post";
    //设置头信息
    QNetworkRequest requestInfo;
    requestInfo.setUrl(QUrl(url));
    requestInfo.setHeader(QNetworkRequest::ContentTypeHeader,QVariant("application/json"));
    //requestInfo.setRawHeader("Content-Type","application/json");//服务器要求的数据头部
    //requestInfo.setRawHeader("Accept","text/json,*/*;q=0.5");//服务器要求的数据头部

    //发送数据
    QJsonObject regionObject;
    regionObject.insert("name","333");
    regionObject.insert("height", "2");
    regionObject.insert("dir", "0");

    QJsonArray pointAry;
    pointAry.append(0.8);
    pointAry.append(1.0);
    pointAry.append(0.0);

    pointAry.append(1.8);
    pointAry.append(2.0);
    pointAry.append(0.0);

    regionObject.insert("points", QJsonValue(pointAry));

    QJsonObject jsonObject;
    jsonObject.insert("Code", "asss");
    jsonObject.insert("parentId", 0);
    jsonObject.insert("depot", "past");
    jsonObject.insert("region", QJsonValue(regionObject));

    QJsonDocument jsonDoc;
    jsonDoc.setObject(jsonObject);

    QByteArray qByteHttpData = jsonDoc.toJson();
    QNetworkReply *reply =  m_pHttpMgr->post(requestInfo, qByteHttpData);

    //添加事件循环机制，返回后再运行后面的
    QEventLoop eventLoop;
    QObject::connect(reply, SIGNAL(finished()), &eventLoop, SLOT(quit()));
    eventLoop.exec();       //block until finish

    //错误处理
    if (reply->error() != QNetworkReply::NoError)
    {
        qDebug()<<"request protobufHttp handle errors here";
        QVariant statusCodeV = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
        //statusCodeV是HTTP服务器的相应码，reply->error()是Qt定义的错误码，可以参考QT的文档
        qDebug( "request protobufHttp found error ....code: %d %d\n", statusCodeV.toInt(), (int)reply->error());
        qDebug(qPrintable(reply->errorString()));
    }

    //请求收到的结果
    QByteArray responseByte = reply->readAll();
    QString strRes = responseByte;
    qDebug() << "Post:" << strRes;
}

void sendGetRequest()
{
    QNetworkAccessManager *m_pHttpMgr = new QNetworkAccessManager();

    //设置url
    QString url = "http://localhost:80/Get;
    QNetworkRequest requestInfo;
    requestInfo.setUrl(QUrl(url));

    //添加事件循环机制，返回后再运行后面的
    QEventLoop eventLoop;
    QNetworkReply *reply =  m_pHttpMgr->get(requestInfo);
    QObject::connect(reply, SIGNAL(finished()), &eventLoop, SLOT(quit()));
    eventLoop.exec();       //block until finish

    //错误处理
    if (reply->error() != QNetworkReply::NoError)
    {
        qDebug()<<"request protobufHttp handle errors here";
        QVariant statusCodeV = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
        //statusCodeV是HTTP服务器的相应码，reply->error()是Qt定义的错误码，可以参考QT的文档
        qDebug( "request protobufHttp found error ....code: %d %d\n", statusCodeV.toInt(), (int)reply->error());
        qDebug(qPrintable(reply->errorString()));
    }

    //请求返回的结果
    QByteArray responseByte = reply->readAll();

    QString strRes = responseByte;
    qDebug() << "Get:" << strRes;

    QFile file(QDir::currentPath() + "/myResponde.json");

    if(!file.open(QIODevice::ReadWrite))
    {
        qDebug() << "File open error";
    }

    file.write(responseByte);
    file.close();
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    sendPostRequest();

    //sendGetRequest();

    return a.exec();
}