的Node.js简单的Redis应用抛出“未处理的错误”

Question

我想从http://expressjs.com/guide.html尝试示例应用程序，所以我写了下面的：

var express = require('express') 
var redis = require('redis') 
var db = redis.createClient(); 
var app = express(); 

app.use(function(req, res, next){ 
    var ua = req.headers['user-agent']; 
    db.zadd('online', Date.now(), ua, next); 
}); 

app.use(function(req, res, next){ 
    var min = 60 * 1000; 
    var ago = Date.now() - min; 
    db.zrevrangebyscore('online', '+inf', ago, function(err, users){ 
    if (err) return next(err); 
    req.online = users; 
    next(); 
    }); 
}); 

app.get('/', function(req,res){ 
    res.send(req.online.length + ' users online'); 
}); 


app.listen(3000); 

而是试图启动它后，我得到

events.js:71 
     throw arguments[1]; // Unhandled 'error' event 
        ^
Error: Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED 
    at RedisClient.on_error (/home/USER/programming/nodejs/express1/node_modules/redis/index.js:148:24) 
    at Socket.<anonymous> (/home/USER/programming/nodejs/express1/node_modules/redis/index.js:83:14) 
    at Socket.EventEmitter.emit (events.js:96:17) 
    at Socket._destroy.self.errorEmitted (net.js:329:14) 
    at process.startup.processNextTick.process._tickCallback (node.js:244:9) 

我用node.js 0.8.18及以下软件包：

app@0.0.1 /home/USER/programming/nodejs/express1 
├─┬ express@3.1.0 
│ ├── buffer-crc32@0.1.1 
│ ├── commander@0.6.1 
│ ├─┬ connect@2.7.2 
│ │ ├── bytes@0.1.0 
│ │ ├── formidable@1.0.11 
│ │ ├── pause@0.0.1 
│ │ └── qs@0.5.1 
│ ├── cookie@0.0.5 
│ ├── cookie-signature@0.0.1 
│ ├── debug@0.7.2 
│ ├── fresh@0.1.0 
│ ├── methods@0.0.1 
│ ├── mkdirp@0.3.3 
│ ├── range-parser@0.0.4 
│ └─┬ send@0.1.0 
│ └── mime@1.2.6 
└── redis@0.8.2 

Answer 1

检查reddis港。如果正确，请在任何可能阻止该端口的防火墙中为该端口设置通配符。检查是否有其他人正在使用该端口。检查您的连接设置。