终于搞定使用node.js +redis 作为服务端，提供图片上传存储服务

系统不提供业务层面上的逻辑，只负责存储和结构关系。业务相关的数据，全部通过参数化传入。

upload.js 文件代码：

//自定义参数区var basePath='e:/';//上传的根路径var tempPath='c:/';var redis_ip='127.0.0.1';var redis_port=11000;var redis_dbindex=5;//系统说明：//POST的时候，系统一定要传递的参数有 url,path,key,db_index//GET的时候.del=filepath,path格式/123/23/23/sdf.jpg   .需要传递del,key,dbindex//----系统定义区var http = require('http');var fs=require('fs');var ps=require('path');var formidable = require('formidable');var util=require('util');var redis = require('redis');var querystring=require('querystring');var server;server = http.createServer(function(req, res) {if (req.method=='POST') {var form = new formidable.IncomingForm(),files = new Array(),File=null,fields = new Array();form.uploadDir = tempPath;form.encoding='utf-8';form.maxFieldsSize=5*1024*1024;form.keepExtensions=false;form.on('field', function(field, value) {try{fields[field]=value;}catch(e){writefalse(res,e,'onfield error');}}).on('file', function(field, file) {try{files[field]=file;File=file;}catch(e){writefalse(res,e,'onfile error!');}}).on('end', function() { try{if(fields['url'] && fields['path']&& File.size>0){if(fields['filesize'] && File.size>fields['filesize']){fs.unlink(File.path,function(err){});writefalse(res,'','文件大小超过限制！');}else{var descPath=basePath+fields['path'];mkdirs(descPath,0755,function(){var rnd=generateMixed(6);var filename=rnd+File.name.substr(File.name.lastIndexOf('.'));fs.rename(File.path, descPath+'/'+filename, function(err){   console.log(err+'');});writeRedisList(fields,filename);  });res.writeHead(302,{'Location':fields['url']});res.end('0');}}else{writefalse(res,'','需要传入跳转url，path!');}}catch(e){//console.log(e);writefalse(res,e,'上传事件出错！');                                                                                                                                                                                                                                                                                                                   }}).on('error',function(err){//console.log(err+'');writefalse(res,err,'上传文件出错!');});try{form.parse(req);}catch(e){//console.log(e);writefalse(res,e,'form.parse error');}} else if(req.method=='GET'){try{var para=querystring.parse(req.url.replace('/?',''));if(para.del && para.key){//删除文件var path=basePath+para.del;fs.unlink(path, function(err){});//删除redisdelItemFromRedisList(para.key,para.del,para.dbindex);writefalse(res,'','1');}}catch(e){writefalse(res,e,'GET 错误！');}}else {res.writeHead(404, {'content-type': 'text/html;charset=utf-8'});res.end('0');}});server.listen(8888);console.log('listening on http://localhost:'+8888+'/');function writefalse(res,e,msg){res.writeHead(200, {'content-type': 'text/html;charset=utf-8'});if(msg){res.end(msg);}elseres.end('0');console.log(''+e);}//写入redis  List形式的function writeRedisList(fields,filename){try{//循环获取传过来的参数，找到redis 相关的。   var redisClient = redis.createClient(redis_port,redis_ip);   redisClient.on("error", function (err) {console.log("Error " + err);return false;});if(fields['key']){var json='{';for(var s  in fields){if(s.indexOf('redis_')==0 ){json +='\''+s.substr(6)+'\':\''+fields[s]+'\',';}} //console.log('filename:'+filename);if(fields['path'] && filename){json +='\'Path\':\''+fields['path']+filename+'\',';}if(json.length>1)json=json.substr(0,json.length-1);json += '}';if(fields['db_index'])redis_dbindex=fields['db_index'];redisClient.select(redis_dbindex,function(){redisClient.rpush(fields['key'], json, function(){redisClient.quit();});      });} return true;}catch(e){console.log('redis error:'+e);return false;}}//从redis里删除function delItemFromRedisList(key,path,dbindex){try{//循环获取传过来的参数，找到redis 相关的。   var redisClient = redis.createClient(redis_port,redis_ip);   redisClient.on("error", function (err) {console.log("Error " + err);return false;});if(key&&path){if(dbindex)redis_dbindex=dbindex;redisClient.select(redis_dbindex,function(){redisClient.lrange(key, 0,-1, function (err, replies){replies.forEach(function (reply, i) {console.log("    " + i + ": " + reply);if(reply.indexOf(path)>-1){redisClient.lrem(key,0,reply,function(){  redisClient.quit();  });}});});    });} return true;}catch(e){console.log('redis error:'+e);return false;}}//获取N 个随机字符 function generateMixed(n) {var jschars = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'];    var res = "";    for(var i = 0; i < n ; i ++) {        var id = Math.ceil(Math.random()*35);        res += jschars[id];    }    return res;} //定义创建目录方法var mkdirs = module.exports.mkdirs = function(dirpath, mode, callback) {    ps.exists(dirpath, function(exists) {        if(exists) {                callback(dirpath);        } else {                //尝试创建父目录，然后再创建当前目录                mkdirs(ps.dirname(dirpath), mode, function(){                        fs.mkdir(dirpath, mode, callback);                });        }    });};

业务层面传入方法代码：

<form action="http://127.0.0.1/upload" method="post" enctype="multipart/form-data"   name="a"><input type="file" name="f"  /><input type="hidden" name="url" value="http://www.baidu.com" /><input type="hidden" name="key" value="tipboy" /><input type="hidden" name="filesize" value="1048576" /><input type="hidden" name="path" value="412/23/41/32/" /><input type="hidden" name="redis_data" value="tipboy123" /><input type="submit" name="sub" /></form>