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.phpexpires      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-utils
service netfs restart
chkconfig 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;}}