错误:大多数中间件(如bodyParser)不再与Express捆绑在一起

Question

我需要创建一个Web服务,我在服务器中使用Node.js. 但是当我在localhost中运行时,我收到一个错误:

错误:大多数中间件(如bodyParser)不再与Express捆绑在一起,必须单独安装.请参阅https://github.com/senchalabs/connect#middleware.

neo4jtest.js

var config = require('./config');   
var bodyParser = require('body-parser'); 

var app = express();

var neo4jurl = process.env.NEO4J_URL ;
neo4jurl = neo4jurl +'/db/data/';

var query = [ 'START me=node:node_auto_index(name={inputusername}) MATCH me<--friend<--friend_of_friend where (friend_of_friend.entitytype={inputentitytype}) RETURN friend_of_friend;' ];
var insertquery = [ 'CREATE (user {entitytype:{inputentitytype}, name : {inputname}}) return user;' ];
var queryforallrelation = [ 'start n = node:node_auto_index(name={inputusername}) match(n)--(x)  return x;'];

// Config


    var env = process.env.NODE_ENV || 'development';
    if ('development' == env) {
    // configure stuff here
    app.use(express.bodyParser());
    app.use(express.methodOverride());
    app.use(app.router);
    app.use(express.static(path.join(application_root, "public")));
    app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
    }

app.get('/api', function (req, res) {
  res.send('REST API is running');
});

app.get('/friendoffriend/:username', function (req, res){
    res.set({'Content-Type': 'text/json'});
    username = req.params.username;
    type = 'user';
    neo4j.connect(neo4jurl, function (err, graph) {

            graph.query(query.join('\n'), {inputusername : username, inputentitytype :type} ,function (err, results) {  
                if (err) {
                    res.send(HTTPStatus.INTERNAL_SERVER_ERROR,'Internal Server Error');
                }
                else {
                    res.send(HTTPStatus.OK,JSON.stringify(results));
                }
            }); 
    });
});

app.get('/insertuser/:username', function (req, res){
    res.set({'Content-Type': 'text/json'});
    username = req.params.username;
    type = 'user';
    neo4j.connect(neo4jurl, function (err, graph) {
            graph.query(insertquery.join('\n'), {inputname : username, inputentitytype :type} ,function (err, results) {    
                if (err) {
                    res.send(HTTPStatus.INTERNAL_SERVER_ERROR,'Internal Server Error');
                }
                else {
                    res.send(HTTPStatus.OK,JSON.stringify(results));
                }
            }); 
    });
});

//Cypher Query with Javascript Callback Example

function neo4jQuery(neo4jurl, query, parameters, giveresults) {
    neo4j.connect(neo4jurl, function (err, graph) {
        graph.query(query.join('\n'), {inputusername : 'andrew'} ,function (err, results) { 
            if (err) {
                giveresults(HTTPStatus.INTERNAL_SERVER_ERROR);
            }
            else {
                giveresults(JSON.stringify(results));
            }
        }); 
    });
}

app.get('/allrelations/:username', function (req, res){
    res.set({'Content-Type': 'text/json'});
    username = req.params.username;
    parameters = {inputusername : username};
    neo4jQuery(neo4jurl, queryforallrelation, parameters, function(results){
        res.send(results);
    });
});



app.listen(1212);

以下是我从控制台得到的错误:

C:\node\NodejsNeo4j1-master>node neo4jtest.js

Error: Most middleware (like bodyParser) is no longer bundled with Express and must be installed separately. Please see https://github.com/senchalabs/connect#middleware.
    at Function.Object.defineProperty.get (C:\node\NodejsNeo4j1-master\node_modules\express\lib\express.js:89:13)
    at Object.<anonymous> (C:\node\NodejsNeo4j1-master\neo4jtest.js:26:18)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:906:3

Answer 1

编辑:我发布了一个Brian的种子分支,其中包含以下所有更改:https: //github.com/LossyHorizo​​n/angular-socket-io-seed

我在与自己斗争中找到了这个讨论.在开始一个新项目之前,我正在更新我的
https://github.com/btford/angular-socket-io-seed副本.我计划如何将我的更改提交给Brian Ford.

旧的package.json

    "socket.io": "~0.9.16",
    "jade": "~0.31.2",
    "express": "~3.2.6"

新的package.json

    "socket.io": "1.1.*",
    "jade": "1.6.*",
    "express": "4.8.*",
    "serve-favicon": "2",
    "morgan": "1.3.*",
    "method-override":"*", //added missing ,
    "body-parser": "1.8",
    "errorhandler": "*",
    "express-session": "*",
    "multer": "0.1.*"

您需要显式添加以前只存在的中间件,一行:

    var express = require('express');

成为一堆线:

    var express = require('express');
    var favicon = require('serve-favicon');
    var logger = require('morgan');
    var methodOverride = require('method-override');
    var session = require('express-session');
    var bodyParser = require('body-parser');
    var multer = require('multer');
    var errorHandler = require('errorhandler');

旧设置代码:

    app.set('port', process.env.PORT || 3000);
    app.set('views', __dirname + '/views');
    app.set('view engine', 'jade');
    app.use(express.logger('dev'));
    app.use(express.bodyParser());
    app.use(express.methodOverride());
    app.use(express.static(path.join(__dirname, 'public')));
    app.use(app.router);

新设置代码:

    app.set('port', process.env.PORT || 3000);
    app.set('views', __dirname + '/views');
    app.set('view engine', 'jade');
    app.use(favicon(__dirname + '/public/favicon.ico'));
    app.use(logger('dev'));
    app.use(methodOverride());
    app.use(session({ resave: true, saveUninitialized: true, 
                      secret: 'uwotm8' }));

    // parse application/json
    app.use(bodyParser.json());                        

    // parse application/x-www-form-urlencoded
    app.use(bodyParser.urlencoded({ extended: true }));

    // parse multipart/form-data
    app.use(multer());

    app.use(express.static(path.join(__dirname, 'public')));

这是永远带我的部分.可悲的是,一旦我解决了这个问题,我查看了express/lib/application.js,搜索了app.listen并且有一个很好的评论可以很好地解释事情.不知道为什么我查看源代码这么慢,虽然看起来我并不孤单.

演示,文档,大多数博客文章,说你用这个开始你的应用程序,它的工作原理,但锁定我们使用socket.io(http和https同时也).

    app.listen(app.get('port'), function(){
       console.log('Express server on port ' + app.get('port'));
    });

这在功能上是相同的,但使socket.io的使用变得容易.查找app.listen()的源代码,您将看到它正是它正在做的事情.

    // could be/remain at top of file
    var http = require('http');    

    var server = http.createServer (app);
    // delete this line if NOT using socket.io
    var io = require('socket.io').listen(server);   

    server.listen(app.get('port'), function(){
       console.log('Express server on port ' + app.get('port'));
    });

如果你使用新的express'标准'语法,或者这个语法,无论如何都使用相同的http对象,我无所谓,并且我记得http是node.js的内置组件.

我希望这有助于其他人.

Answer 2

• 首先安装bodyParser:

  npm install body-parser

• 并使用它:

  var bodyParser = require('body-parser'); 
  app.use(bodyParser.urlencoded({
      extended: true
  }));
  app.use(bodyParser.json());
  

Answer 3

您需要替换旧的捆绑中间件使用(express.bodyParser,express.methodOverride,express.errorHandler与外部/独立的中间件).错误中的链接为您提供了这些新中间件的名称.您可能需要检查这些中间件的文档,以检查自Express 3以来的任何API更改.