ℰ悟透Qt-Http网络编程，可直接跑动的源码

#include "widget.h" #include <QGridLayout> #include <QVBoxLayout> #include <QHBoxLayout> #include <QUrl> #include <QByteArray> #include <QFileDialog> #include <QMessageBox> static const char* g_ext_to_content_type[] = { ".001", "application/x-001" , ".301", "application/x-301" , ".323", "text/h323" , ".906", "application/x-906" , ".907", "drawing/907" , ".a11", "application/x-a11" , ".acp", "audio/x-mei-aac" , ".ai", "application/postscript" , ".aif", "audio/aiff" , ".aifc", "audio/aiff" , ".aiff", "audio/aiff" , ".anv", "application/x-anv" , ".asa", "text/asa" , ".asf", "video/x-ms-asf" , ".asp", "text/asp" , ".asx", "video/x-ms-asf" , ".au", "audio/basic" , ".avi", "video/avi" , ".awf", "application/vnd.adobe.workflow" , ".biz", "text/xml" , ".bmp", "application/x-bmp" , ".bot", "application/x-bot" , ".c4t", "application/x-c4t" , ".c90", "application/x-c90" , ".cal", "application/x-cals" , ".cat", "application/vnd.ms-pki.seccat" , ".cdf", "application/x-netcdf" , ".cdr", "application/x-cdr" , ".cel", "application/x-cel" , ".cer", "application/x-x509-ca-cert" , ".cg4", "application/x-g4" , ".cgm", "application/x-cgm" , ".cit", "application/x-cit" , ".class", "java/*" , ".cml", "text/xml" , ".cmp", "application/x-cmp" , ".cmx", "application/x-cmx" , ".cot", "application/x-cot" , ".conf", "text/plain" , ".crl", "application/pkix-crl" , ".crt", "application/x-x509-ca-cert" , ".csi", "application/x-csi" , ".css", "text/css" , ".cut", "application/x-cut" , ".dbf", "application/x-dbf" , ".dbm", "application/x-dbm" , ".dbx", "application/x-dbx" , ".dcd", "text/xml" , ".dcx", "application/x-dcx" , ".der", "application/x-x509-ca-cert" , ".dgn", "application/x-dgn" , ".dib", "application/x-dib" , ".dll", "application/x-msdownload" , ".doc", "application/msword" , ".dot", "application/msword" , ".drw", "application/x-drw" , ".dtd", "text/xml" , ".dwf", "Model/vnd.dwf" , ".dwf", "application/x-dwf" , ".dwg", "application/x-dwg" , ".dxb", "application/x-dxb" , ".dxf", "application/x-dxf" , ".edn", "application/vnd.adobe.edn" , ".emf", "application/x-emf" , ".eml", "message/rfc822" , ".ent", "text/xml" , ".epi", "application/x-epi" , ".eps", "application/x-ps" , ".eps", "application/postscript" , ".etd", "application/x-ebx" , ".exe", "application/x-msdownload" , ".fax", "image/fax" , ".fdf", "application/vnd.fdf" , ".fif", "application/fractals" , ".fo", "text/xml" , ".frm", "application/x-frm" , ".g4", "application/x-g4" , ".gbr", "application/x-gbr" , ".gcd", "application/x-gcd" , ".gif", "image/gif" , ".gl2", "application/x-gl2" , ".gp4", "application/x-gp4" , ".hgl", "application/x-hgl" , ".hmr", "application/x-hmr" , ".hpg", "application/x-hpgl" , ".hpl", "application/x-hpl" , ".hqx", "application/mac-binhex40" , ".hrf", "application/x-hrf" , ".hta", "application/hta" , ".htc", "text/x-component" , ".htm", "text/html" , ".html", "text/html" , ".htt", "text/webviewhtml" , ".htx", "text/html" , ".icb", "application/x-icb" , ".ico", "image/x-icon" , ".ico", "application/x-ico" , ".iff", "application/x-iff" , ".ig4", "application/x-g4" , ".igs", "application/x-igs" , ".iii", "application/x-iphone" , ".img", "application/x-img" , ".ini", "text/plain" , ".ins", "application/x-internet-signup" , ".isp", "application/x-internet-signup" , ".IVF", "video/x-ivf" , ".java", "java/*" , ".jfif", "image/jpeg" , ".jpe", "image/jpeg" , ".jpe", "application/x-jpe" , ".jpeg", "image/jpeg" , ".jpg", "image/jpeg" , ".jpg", "application/x-jpg" , ".js", "application/x-javascript" , ".jsp", "text/html" , ".la1", "audio/x-liquid-file" , ".lar", "application/x-laplayer-reg" , ".latex", "application/x-latex" , ".lavs", "audio/x-liquid-secure" , ".lbm", "application/x-lbm" , ".lmsff", "audio/x-la-lms" , ".log", "text/plain" , ".ls", "application/x-javascript" , ".ltr", "application/x-ltr" , ".m1v", "video/x-mpeg" , ".m2v", "video/x-mpeg" , ".m3u", "audio/mpegurl" , ".m4e", "video/mpeg4" , ".mac", "application/x-mac" , ".man", "application/x-troff-man" , ".math", "text/xml" , ".mdb", "application/msaccess" , ".mdb", "application/x-mdb" , ".mfp", "application/x-shockwave-flash" , ".mht", "message/rfc822" , ".mhtml", "message/rfc822" , ".mi", "application/x-mi" , ".mid", "audio/mid" , ".midi", "audio/mid" , ".mil", "application/x-mil" , ".mml", "text/xml" , ".mnd", "audio/x-musicnet-download" , ".mns", "audio/x-musicnet-stream" , ".mocha", "application/x-javascript" , ".movie", "video/x-sgi-movie" , ".mp1", "audio/mp1" , ".mp2", "audio/mp2" , ".mp2v", "video/mpeg" , ".mp3", "audio/mp3" , ".mp4", "video/mpeg4" , ".mpa", "video/x-mpg" , ".mpd", "application/vnd.ms-project" , ".mpe", "video/x-mpeg" , ".mpeg", "video/mpg" , ".mpg", "video/mpg" , ".mpga", "audio/rn-mpeg" , ".mpp", "application/vnd.ms-project" , ".mps", "video/x-mpeg" , ".mpt", "application/vnd.ms-project" , ".mpv", "video/mpg" , ".mpv2", "video/mpeg" , ".mpw", "application/vnd.ms-project" , ".mpx", "application/vnd.ms-project" , ".mtx", "text/xml" , ".mxp", "application/x-mmxp" , ".net", "image/pnetvue" , ".nrf", "application/x-nrf" , ".nws", "message/rfc822" , ".odc", "text/x-ms-odc" , ".out", "application/x-out" , ".p10", "application/pkcs10" , ".p12", "application/x-pkcs12" , ".p7b", "application/x-pkcs7-certificates" , ".p7c", "application/pkcs7-mime" , ".p7m", "application/pkcs7-mime" , ".p7r", "application/x-pkcs7-certreqresp" , ".p7s", "application/pkcs7-signature" , ".pc5", "application/x-pc5" , ".pci", "application/x-pci" , ".pcl", "application/x-pcl" , ".pcx", "application/x-pcx" , ".pdf", "application/pdf" , ".pdf", "application/pdf" , ".pdx", "application/vnd.adobe.pdx" , ".pfx", "application/x-pkcs12" , ".pgl", "application/x-pgl" , ".pic", "application/x-pic" , ".pko", "application/vnd.ms-pki.pko" , ".pl", "application/x-perl" , ".plg", "text/html" , ".pls", "audio/scpls" , ".plt", "application/x-plt" , ".png", "image/png" , ".png", "application/x-png" , ".pot", "application/vnd.ms-powerpoint" , ".ppa", "application/vnd.ms-powerpoint" , ".ppm", "application/x-ppm" , ".pps", "application/vnd.ms-powerpoint" , ".ppt", "application/vnd.ms-powerpoint" , ".ppt", "application/x-ppt" , ".pr", "application/x-pr" , ".prf", "application/pics-rules" , ".prn", "application/x-prn" , ".prt", "application/x-prt" , ".ps", "application/x-ps" , ".ps", "application/postscript" , ".ptn", "application/x-ptn" , ".pwz", "application/vnd.ms-powerpoint" , ".r3t", "text/vnd.rn-realtext3d" , ".ra", "audio/vnd.rn-realaudio" , ".ram", "audio/x-pn-realaudio" , ".ras", "application/x-ras" , ".rat", "application/rat-file" , ".rdf", "text/xml" , ".rec", "application/vnd.rn-recording" , ".red", "application/x-red" , ".rgb", "application/x-rgb" , ".rjs", "application/vnd.rn-realsystem-rjs" , ".rjt", "application/vnd.rn-realsystem-rjt" , ".rlc", "application/x-rlc" , ".rle", "application/x-rle" , ".rm", "application/vnd.rn-realmedia" , ".rmf", "