终于搞定使用node.js +redis 作为服务端，提供图片上传存储服务

//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redis
delItemFromRedisList(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);
}
else
res.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);
});
}
});
};

<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>