详解Qt如何使用QtWebApp搭建Http服务器
作者：小灰灰搞电子
这篇文章主要为大家详细介绍了Qt如何使用QtWebApp搭建Http服务器,文中的示例代码讲解详细,感兴趣的小伙伴可以跟随小编一起学习一下
一、QtWebApp源码下载
a 、下载地址
http://www.stefanfrings.de/qtwebapp/QtWebApp.zip
b、 源码目录
二、http服务器搭建
a、使用qt creater新建一个项目
b、将QtWebApp的源码拷贝到工程中
c、新建一个httpServer的类，继承stefanfrings::HttpRequestHandler
需要包含相关头文件
#include <QObject> #include "httpserver/httprequesthandler.h" #include <QSettings> #include "httpserver/httplistener.h" //新增代码 #include "httpserver/httprequesthandler.h" //新增代码 #include "httpserver/staticfilecontroller.h" #include "httpserver.h" #include <QFile> #include <QFileInfo>
httpServer.h
#ifndef HTTPSERVER_H
#define HTTPSERVER_H
#include <QObject>
#include "httpserver/httprequesthandler.h"
#include <QSettings>
#include "httpserver/httplistener.h" //新增代码
#include "httpserver/httprequesthandler.h" //新增代码
#include "httpserver/staticfilecontroller.h"
#include "httpserver.h"
#include <QFile>
#include <QFileInfo>
class HttpServer : public stefanfrings::HttpRequestHandler
{
Q_OBJECT
public:
explicit HttpServer(QObject *parent = nullptr);
void service(stefanfrings::HttpRequest& request, stefanfrings::HttpResponse& response);
/** Encoding of text files */
QString encoding;
/** Root directory of documents */
QString docroot;
/** Maximum age of files in the browser cache */
int maxAge;
struct CacheEntry {
QByteArray document;
qint64 created;
QByteArray filename;
};
/** Timeout for each cached file */
int cacheTimeout;
/** Maximum size of files in cache, larger files are not cached */
int maxCachedFileSize;
/** Cache storage */
QCache<QString,CacheEntry> cache;
/** Used to synchronize cache access for threads */
QMutex mutex;
};
#endif // HTTPSERVER_H
httpServer.cpp
#include "httpserver.h"
HttpServer::HttpServer(QObject *parent)
: HttpRequestHandler{parent}
{
QString configFileName=":/new/prefix1/webapp.ini";
QSettings* listenerSettings=new QSettings(configFileName, QSettings::IniFormat, this);
listenerSettings->beginGroup("listener"); //新增代码
new stefanfrings::HttpListener(listenerSettings, this, this); //新增代码
docroot = "E:/Qt/learning/httpServer/HttpServer";
}
void HttpServer::service(stefanfrings::HttpRequest &request, stefanfrings::HttpResponse &response)
{
QByteArray path=request.getPath();
// Check if we have the file in cache
qint64 now=QDateTime::currentMSecsSinceEpoch();
mutex.lock();
CacheEntry* entry=cache.object(path);
if (entry && (cacheTimeout==0 || entry->created>now-cacheTimeout))
{
QByteArray document=entry->document; //copy the cached document, because other threads may destroy the cached entry immediately after mutex unlock.
QByteArray filename=entry->filename;
mutex.unlock();
qDebug("StaticFileController: Cache hit for %s",path.data());
response.setHeader("Content-Type", "application/x-zip-compressed");
response.setHeader("Cache-Control","max-age="+QByteArray::number(maxAge/1000));
response.write(document,true);
}
else
{
mutex.unlock();
// The file is not in cache.
qDebug("StaticFileController: Cache miss for %s",path.data());
// Forbid access to files outside the docroot directory
if (path.contains("/.."))
{
qWarning("StaticFileController: detected forbidden characters in path %s",path.data());
response.setStatus(403,"forbidden");
response.write("403 forbidden",true);
return;
}
// If the filename is a directory, append index.html.
if (QFileInfo(docroot+path).isDir())
{
response.setStatus(404,"not found");
response.write("404 not found",true);
return;
}
// Try to open the file
QFile file(docroot+path);
qDebug("StaticFileController: Open file %s",qPrintable(file.fileName()));
if (file.open(QIODevice::ReadOnly))
{
response.setHeader("Content-Type", "application/x-zip-compressed");
response.setHeader("Cache-Control","max-age="+QByteArray::number(maxAge/1000));
response.setHeader("Content-Length",QByteArray::number(file.size()));
if (file.size()<=maxCachedFileSize)
{
// Return the file content and store it also in the cache
entry=new CacheEntry();
while (!file.atEnd() && !file.error())
{
QByteArray buffer=file.read(65536);
response.write(buffer);
entry->document.append(buffer);
}
entry->created=now;
entry->filename=path;
mutex.lock();
cache.insert(request.getPath(),entry,entry->document.size());
mutex.unlock();
}
else
{
// Return the file content, do not store in cache
while (!file.atEnd() && !file.error())
{
response.write(file.read(65536));
}
}
file.close();
}
else {
if (file.exists())
{
qWarning("StaticFileController: Cannot open existing file %s for reading",qPrintable(file.fileName()));
response.setStatus(403,"forbidden");
response.write("403 forbidden",true);
}
else
{
response.setStatus(404,"not found");
response.write("404 not found",true);
}
}
}
}
程序中
QString configFileName=":/new/prefix1/webapp.ini";
QSettings* listenerSettings=new QSettings(configFileName, QSettings::IniFormat, this);
listenerSettings->beginGroup("listener"); //新增代码
new stefanfrings::HttpListener(listenerSettings, this, this); //新增代码
docroot = "E:/Qt/learning/httpServer/HttpServer";
configFileName为配置文件内容如下：
[listener] ;host=127.0.0.1 port=8080 minThreads=4 maxThreads=100 cleanupInterval=60000 readTimeout=60000 maxRequestSize=16000 maxMultiPartSize=10000000 [docroot] path=E:/Qt/learning/httpServer/HttpServer encoding=UTF-8 maxAge=60000 cacheTime=60000 cacheSize=1000000 maxCachedFileSize=65536
docroot 为文件的根目录
三、启动http服务器
在mainwindow中新建一个HttpServer 变量，然后实例化，
此时http服务器已经启动了。
四、获取http服务器文件
a、打开浏览器输入http://localhost:8080/filename就能下载到文件名为filename的文件了。
b、我的程序中只实现了zip文件，如果是其他类型文件需要修改一下地方
为
void StaticFileController::setContentType(const QString fileName, HttpResponse &response) const
{
if (fileName.endsWith(".png"))
{
response.setHeader("Content-Type", "image/png");
}
else if (fileName.endsWith(".jpg"))
{
response.setHeader("Content-Type", "image/jpeg");
}
else if (fileName.endsWith(".gif"))
{
response.setHeader("Content-Type", "image/gif");
}
else if (fileName.endsWith(".pdf"))
{
response.setHeader("Content-Type", "application/pdf");
}
else if (fileName.endsWith(".txt"))
{
response.setHeader("Content-Type", qPrintable("text/plain; charset="+encoding));
}
else if (fileName.endsWith(".html") || fileName.endsWith(".htm"))
{
response.setHeader("Content-Type", qPrintable("text/html; charset="+encoding));
}
else if (fileName.endsWith(".css"))
{
response.setHeader("Content-Type", "text/css");
}
else if (fileName.endsWith(".js"))
{
response.setHeader("Content-Type", "text/javascript");
}
else if (fileName.endsWith(".svg"))
{
response.setHeader("Content-Type", "image/svg+xml");
}
else if (fileName.endsWith(".woff"))
{
response.setHeader("Content-Type", "font/woff");
}
else if (fileName.endsWith(".woff2"))
{
response.setHeader("Content-Type", "font/woff2");
}
else if (fileName.endsWith(".ttf"))
{
response.setHeader("Content-Type", "application/x-font-ttf");
}
else if (fileName.endsWith(".eot"))
{
response.setHeader("Content-Type", "application/vnd.ms-fontobject");
}
else if (fileName.endsWith(".otf"))
{
response.setHeader("Content-Type", "application/font-otf");
}
else if (fileName.endsWith(".json"))
{
response.setHeader("Content-Type", "application/json");
}
else if (fileName.endsWith(".xml"))
{
response.setHeader("Content-Type", "text/xml");
}
// Todo: add all of your content types
else
{
qDebug("StaticFileController: unknown MIME type for filename '%s'", qPrintable(fileName));
}
}
c、下载的源码中有官方的例程可供参考
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