qt中发送http请求

分类：C++, Others, Qt 阅读 (5,211) Add comments

8月 172018

转载请注明原文地址：http://bcoder.com/others/send-http-request-in-qt

　　在QT中发送http请求要使用下面的几个类

QNetworkAccessManager – 用于实际发送网络请求
QNetworkRequest – 用于构造http请求的内容
QNetworkReply – 用于构造http响应的内容

　　首先要在项目文件里增加network的支持，在xxx.pro里面加上如下代码

QT       += core gui
QT += network

1 2	QT += core gui QT += network

　　下面是具体的代码：

　　logindialog.h

#ifndef LOGINDIALOG_H
#define LOGINDIALOG_H

#include <QDialog>

#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QUrl>

#include "constants.h"
#include "jsonobjs/jsonloginres.h"

namespace Ui {
class LoginDialog;
}

class LoginDialog : public QDialog
{
    Q_OBJECT

public:
    explicit LoginDialog(QWidget *parent = 0);
    ~LoginDialog();

private slots:
    void on_btnLogin_clicked();
    void onLoginReqFinished();

private:
    Ui::LoginDialog *ui;
    QNetworkAccessManager* mNam = NULL;
    QNetworkReply* mLoginReply = NULL;
    void reqLogin();

};

#endif // LOGINDIALOG_H

#ifndef LOGINDIALOG_H

#define LOGINDIALOG_H

#include <QDialog>

#include <QNetworkAccessManager>

#include <QNetworkReply>

#include <QNetworkRequest>

#include <QUrl>

#include "constants.h"

#include "jsonobjs/jsonloginres.h"

namespace Ui {

class LoginDialog;

}

class LoginDialog : public QDialog

{

Q_OBJECT

public:

explicit LoginDialog(QWidget *parent = 0);

~LoginDialog();

private slots:

void on_btnLogin_clicked();

void onLoginReqFinished();

private:

Ui::LoginDialog *ui;

QNetworkAccessManager* mNam = NULL;

QNetworkReply* mLoginReply = NULL;

void reqLogin();

};

#endif // LOGINDIALOG_H

　　logindialog.cpp

#include "logindialog.h"
#include "ui_logindialog.h"

LoginDialog::LoginDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::LoginDialog)
{
    ui->setupUi(this);
    mNam = new QNetworkAccessManager(this);
    //连接返回的信号槽
    //connect(mNam, SIGNAL(finished(QNetworkReply*)), this, SLOT(onLoginReqFinished(QNetworkReply*)));
}

LoginDialog::~LoginDialog()
{
    delete mLoginReply;
    delete mNam;
    delete ui;
}

void LoginDialog::on_btnLogin_clicked()
{
    reqLogin();;
}

void LoginDialog::reqLogin()
{
    if(NULL != mLoginReply && !mLoginReply->isFinished()){
        return;
    }
    QNetworkRequest request;
    std::string url("http://bcoder.com/loginapi");

    QByteArray params ;
    params.append("ucode=" + ui->edtUserName->text());
    params.append("&password=" + ui->edtPassword->text());
    request.setUrl(QUrl(url.c_str()));
    //request.setRawHeader("Content-Type","application/json");
    request.setRawHeader("Content-Type","application/x-www-form-urlencoded");
//    request->setRawHeader("Accept","text/html, application/xhtml+xml, */*");
//    request->setRawHeader("Referer","http://localhost:8888/login");
//    request->setRawHeader("Accept-Language","zh-CN");
//    request->setRawHeader("X-Requested-With","XMLHttpRequest");
//    request->setRawHeader("User-Agent","Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)");
//    request->setRawHeader("Content-Type","application/x-www-form-urlencoded");
//    request->setRawHeader("Accept-Encoding","gzip,deflate");
//    request->setRawHeader("Host","localhost:8888");
//    request->setRawHeader("Content-Length","18");
//    request->setRawHeader("Connection","Keep-Alive");
//    request->setRawHeader("Cache-Control","no-cache");
    mLoginReply = mNam->post(request, params);
    connect(mLoginReply, SIGNAL(finished()), this, SLOT(onLoginReqFinished()));
}


void LoginDialog::onLoginReqFinished()
{
    QByteArray bytes = mLoginReply->readAll();  // bytes
    //QString string(bytes); // string
    QString string = QString::fromUtf8(bytes);
    JsonLoginRes res(string.toStdString());

    qDebug() << "---------------------------------\n" <<  string;

    mLoginReply->close();
//    mLoginReply->deleteLater();
}

#include "logindialog.h"

#include "ui_logindialog.h"

LoginDialog::LoginDialog(QWidget *parent) :

QDialog(parent),

ui(new Ui::LoginDialog)

{

ui->setupUi(this);

mNam = new QNetworkAccessManager(this);

//连接返回的信号槽

//connect(mNam, SIGNAL(finished(QNetworkReply*)), this, SLOT(onLoginReqFinished(QNetworkReply*)));

}

LoginDialog::~LoginDialog()

{

delete mLoginReply;

delete mNam;

delete ui;

}

void LoginDialog::on_btnLogin_clicked()

{

reqLogin();;

}

void LoginDialog::reqLogin()

{

if(NULL != mLoginReply && !mLoginReply->isFinished()){

return;

}

QNetworkRequest request;

std::string url("http://bcoder.com/loginapi");

QByteArray params ;

params.append("ucode=" + ui->edtUserName->text());

params.append("&password=" + ui->edtPassword->text());

request.setUrl(QUrl(url.c_str()));

//request.setRawHeader("Content-Type","application/json");

request.setRawHeader("Content-Type","application/x-www-form-urlencoded");

// request->setRawHeader("Accept","text/html, application/xhtml+xml, */*");

// request->setRawHeader("Referer","http://localhost:8888/login");

// request->setRawHeader("Accept-Language","zh-CN");

// request->setRawHeader("X-Requested-With","XMLHttpRequest");

// request->setRawHeader("User-Agent","Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)");

// request->setRawHeader("Content-Type","application/x-www-form-urlencoded");

// request->setRawHeader("Accept-Encoding","gzip,deflate");

// request->setRawHeader("Host","localhost:8888");

// request->setRawHeader("Content-Length","18");

// request->setRawHeader("Connection","Keep-Alive");

// request->setRawHeader("Cache-Control","no-cache");

mLoginReply = mNam->post(request, params);

connect(mLoginReply, SIGNAL(finished()), this, SLOT(onLoginReqFinished()));

}

void LoginDialog::onLoginReqFinished()

{

QByteArray bytes = mLoginReply->readAll(); // bytes

//QString string(bytes); // string

QString string = QString::fromUtf8(bytes);

JsonLoginRes res(string.toStdString());

qDebug() << "---------------------------------\n" << string;

mLoginReply->close();

// mLoginReply->deleteLater();

}

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