原来图片服务器采用Windows .net架构，鉴于需求需要生成各种尺寸图片。
流程说明:
用户从Nginx请求对应的图片,判断是否存在_200x300的对应参数，如果没有就直接请求到对应目录的原图，否则继续判断是否在本地已经生成了对应的缓存图片，如果存在返回已经生成过的定制尺寸图片，否则请求PHP动态生成。
Nginx部分配置:
server { listen 80; server_name pics.abc.com; location / { root /var/www/html; index index.html index.htm index.php; error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } location ~ \_(\d+)x(\d+)\.(jpg|png|gif|jpeg|bmp)$ { //判断是否定制图 try_files $uri /temp/$uri /get.php; //判断是否已生成过定制图否则转交给/get.php expires 30d; } location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; } location ~ .*\.(gif|jpg|jpeg|png|bmp)$ { expires 30d; } } } 在/var/www/html我们以只读方式挂载Windows的目录，修改/etc/fstab,添加
\\192.168.2.3\f$\pics.abc.com\pics /var/www/html/pics/ cifs ro,username=user,password=pass 1 2
然后重启netfs服务，另外执行下面命令，安装依赖的包
yum -y install samba-client cifs-utilsservice netfs restartchkconfig netfs on
生成的缩率图会放到网站目录的temp目录下，如请求的http://pics.abc.com/pics/201604/29/abc_200x300.jpg
则生成的图片放在temp/pics/201604/29/abc_200x300.jpg目录下
PHP脚本:
function thumb($src, $width, $height, $filename, $mode = 'scale', $quality = '100') {try { $p_w_picpathValue = getp_w_picpathsize($src); $sourceWidth = $p_w_picpathValue[0]; //原图宽 $sourceHeight = $p_w_picpathValue[1]; //原图高 $thumbWidth = $width; //缩略图宽 $thumbHeight = $height; //缩略图高 $_x = 0; $_y = 0; $w = $sourceWidth; $h = $sourceHeight; if ($mode == 'scale') { if ($sourceWidth <= $thumbWidth && $sourceHeight <= $thumbHeight) { $_x = floor(($thumbWidth - $sourceWidth) / 2); $_y = floor(($thumbHeight - $sourceHeight) / 2); $thumbWidth = $sourceWidth; $thumbHeight = $sourceHeight; } else { if ($thumbHeight * $sourceWidth > $thumbWidth * $sourceHeight) { $thumbHeight = floor($sourceHeight * $width / $sourceWidth); $_y = floor(($height - $thumbHeight) / 2); } else { $thumbWidth = floor($sourceWidth * $height / $sourceHeight); $_x = floor(($width - $thumbWidth) / 2); } } } else if ($mode == 'crop') { if ($sourceHeight < $thumbHeight) { //如果原图尺寸小于当前尺寸 $thumbWidth = floor($thumbWidth * $sourceHeight / $thumbHeight); $thumbHeight = $sourceHeight; } if ($sourceWidth < $thumbWidth) { $thumbHeight = floor($thumbHeight * $sourceWidth / $thumbWidth); $thumbWidth = $sourceWidth; } $s1 = $sourceWidth / $sourceHeight; //原图比例 $s2 = $width / $height; //新图比例 if ($s1 == $s2) { } else if ($s1 > $s2) { //全高度 $y = 0; $ax = floor($sourceWidth * ($thumbHeight / $sourceHeight)); $x = ($ax - $thumbWidth) / 2; $w = $thumbWidth / ($thumbHeight / $sourceHeight); } else { //全宽度 $x = 0; $ay = floor($sourceHeight * ($thumbWidth / $sourceWidth)); //模拟原图比例高度 $y = ($ay - $thumbHeight) / 2; $h = $thumbHeight / ($thumbWidth / $sourceWidth); } } switch ($p_w_picpathValue[2]) { case 2: $source = p_w_picpathcreatefromjpeg($src); break; case 1: $source = p_w_picpathcreatefromgif($src); break; case 3: $source = p_w_picpathcreatefrompng($src); break; case 6: $source = p_w_picpathcreatefromwbmp($src); break; default: defulat(); return; } header("Content-type: p_w_picpath/jpeg"); $thumb = p_w_picpathcreatetruecolor($width, $height); p_w_picpathfill($thumb, 0, 0, p_w_picpathcolorallocate($thumb, 255, 255, 255)); p_w_picpathcopyresampled($thumb, $source, 0, 0, $x, $y, $width, $height, $w, $h); p_w_picpathjpeg($thumb, null, $quality); p_w_picpathjpeg($thumb, $filename, $quality); p_w_picpathdestroy($thumb); p_w_picpathdestroy($source);} catch (Exception $ex) { defulat(); }}function defulat() {/* $default_img = realpath('../pictures/nopic.gif'); ob_start(); header('Content-type:p_w_picpath/jpeg'); readfile($default_img); ob_flush(); flush();*/echo 'error';}function mkDirs($dir){ if(!is_dir($dir)){ if(!mkDirs(dirname($dir))){ return false; } if(!mkdir($dir,0755)){ return false; } } return true;}$uri=$_SERVER['REQUEST_URI'];$p_w_picpath=basename($uri);$temp='./temp/'.dirname($uri).'/';$imgpath='.'.dirname($uri).'/';/*//检查本地是否存在文件，原图if(file_exists($temp.$p_w_picpath)){ ob_start(); header('Content-type:p_w_picpath/jpeg'); readfile($temp.$p_w_picpath); ob_flush(); flush(); exit();}*///检查生成的图片是否曾经生成过，存在即返回，否则重新生成新图if(!preg_match('/_(\d+)x(\d+)/', $p_w_picpath, $wh)){ ob_start(); header('Content-type:p_w_picpath/jpeg'); readfile($imgpath.$p_w_picpath); ob_flush(); flush(); exit();}$width = $wh[1];$height = $wh[2];$source_img=preg_replace('/_(\d+)x(\d+)/', '', $p_w_picpath);//对长宽都超过的图片返回原图if($width>=2000 || $height>=2000){ ob_start(); header('Content-type:p_w_picpath/jpeg'); readfile($imgpath.$source_img); ob_flush(); flush(); exit();}//图片处理$src=$imgpath.$source_img;$filename=$temp.$p_w_picpath;mkDirs($temp);//thumb(realpath($src), $width, $height, $filename, 'crop', '85');thumb(realpath($src), $width, $height, $filename, 'crop', '100'); PHP生成尺寸部分参考<PHP图片自动裁切应付不同尺寸的显示>
如果上述服务器出现问题，则降低的Nginx配置为
server { listen 80; server_name localhost; access_log logs/host.access.log main; location / { rewrite ^/(.*)\_(\d+)x(\d+)\.(.*)$ /$host/$1 permanent; rewrite ^/([0-9a-zA-Z]+)/(.*)$ /$host/$1/$2 permanent; root html; index index.html index.htm; } }