Qt QNetworkAccessManager 下载url

输入Url，可以下载文件例程,效果如图：

下面是代码部分：

Pro文件：

#-------------------------------------------------
#
# Project created by QtCreator 2016-07-09T17:44:18
#
#-------------------------------------------------QT       += core gui
QT += networkgreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsTARGET = myHTTP
TEMPLATE = appSOURCES += main.cpp\mainwindow.cppHEADERS  += mainwindow.hFORMS    +=

mainwindow.h

#pragma once#include <QObject>
#include <QDialog>
#include <QUrl>
#include <QNetworkRequest>
#include <QDialog>class QLabel;
class QGroupBox;
class QPushButton;
class QTextBrowser;
class QNetworkAccessManager;
class QNetworkReply;
class QFile;
class QProgressBar;
class QLineEdit;class MainWindow : public QDialog
{Q_OBJECTpublic:explicit MainWindow(QWidget *parent = 0);~MainWindow();private:QLabel *m_pInputLab;QPushButton *m_pUpdateBtn;QPushButton *m_pCancelBtn;QFile *m_pDownloadFile;QProgressBar *m_pProgressbar;QLineEdit *m_pAddressEdit;QUrl m_pDownloadUrl;QNetworkAccessManager *m_pHttpManager = NULL;QNetworkReply *m_pNetworkReply = NULL;private slots:void OnUpdateBtnclickedSlot(void);void HttpDwnReadyRead();void UpdateDataReadProgress(qint64 bytesRead, qint64 totalBytes);void HttpDwnFinished();private:void InitCtrl(void);void StartRequestDownload(QUrl url);
};

mainwindow.cpp

#include "MainWindow.h"
#include <QLabel>
#include <QPushButton>
#include <QGroupBox>
#include <QProgressBar>
#include <QLineEdit>
#include <QGridLayout>
#include <QTextBrowser>
#include <QVBoxLayout>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QTextCodec>
#include <QJsonParseError>
#include <QJsonObject>
#include <QFile>
#include <QFileInfo>
#include <QMessageBox>
#include <QEventLoop>
#include <QTimer>
#include <QProcess>MainWindow::MainWindow(QWidget *parent):QDialog(parent)
{Qt::WindowFlags flags = Qt::Dialog;flags |= Qt::WindowCloseButtonHint | Qt::WindowMaximizeButtonHint;this->setWindowFlags(flags);this->resize(500,50);InitCtrl();
}
MainWindow::~MainWindow(void)
{}void MainWindow::InitCtrl(void)
{m_pInputLab   = new QLabel(tr("Please input the url"),this);m_pUpdateBtn  = new QPushButton(tr("Download"),this);m_pCancelBtn  = new QPushButton(QStringLiteral("Cancel"),this);m_pProgressbar= new QProgressBar(this);m_pAddressEdit = new QLineEdit(this);m_pAddressEdit->setText("http://slproweb.com/download/Win64OpenSSL_Light-1_1_1k.exe");m_pProgressbar->setVisible(false);QGridLayout *gridlayout = new QGridLayout();gridlayout->addWidget(m_pInputLab,0,0,1,2);gridlayout->addWidget(m_pAddressEdit,1,0,1,2);gridlayout->addWidget(m_pProgressbar,2,0,1,2);gridlayout->addWidget(m_pUpdateBtn,3,0,1,1);gridlayout->addWidget(m_pCancelBtn,3,1,1,1);setLayout(gridlayout);m_pHttpManager    = new QNetworkAccessManager(this);connect(m_pUpdateBtn,SIGNAL(clicked()),this,SLOT(OnUpdateBtnclickedSlot()));}void MainWindow::StartRequestDownload(QUrl url)
{QNetworkRequest request;request.setUrl(url);
//    request.setAttribute(QNetworkRequest::FollowRedirectsAttribute, true);m_pNetworkReply = m_pHttpManager->get(request);connect(m_pNetworkReply, &QNetworkReply::readyRead, this, &MainWindow::HttpDwnReadyRead);connect(m_pNetworkReply, &QNetworkReply::downloadProgress,this, &MainWindow::UpdateDataReadProgress);connect(m_pNetworkReply, &QNetworkReply::finished, this, &MainWindow::HttpDwnFinished);
}void MainWindow::HttpDwnReadyRead()
{if (m_pDownloadFile) m_pDownloadFile->write(m_pNetworkReply->readAll());
}void MainWindow::UpdateDataReadProgress(qint64 bytesRead, qint64 totalBytes)
{m_pProgressbar->setMaximum(totalBytes);m_pProgressbar->setValue(bytesRead);
}void MainWindow::HttpDwnFinished()
{m_pProgressbar->hide();if(m_pDownloadFile) {m_pDownloadFile->close();delete m_pDownloadFile;m_pDownloadFile = nullptr;}m_pNetworkReply->deleteLater();m_pNetworkReply = nullptr;}void MainWindow::OnUpdateBtnclickedSlot(void)
{#if (1)m_pDownloadUrl = m_pAddressEdit->text();QFileInfo info(m_pDownloadUrl.path());QString fileName(info.fileName());if (fileName.isEmpty()) fileName = "unknown";m_pDownloadFile = new QFile(fileName);if(!m_pDownloadFile->open(QIODevice::WriteOnly)){delete m_pDownloadFile;m_pDownloadFile = nullptr;return;}StartRequestDownload(m_pDownloadUrl);m_pProgressbar->setVisible(true);m_pProgressbar->setValue(0);m_pProgressbar->show();
#endif}

main.cpp

#include "mainwindow.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);MainWindow w;w.show();return a.exec();
}

下载地址：

https://download.csdn.net/download/u010505080/16686840

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