错误：大多数中间件（如bodyParser）不再与Express捆绑

Question

我需要创建一个web服务，并且我正在服务器中使用node.js。但当我在localhost中运行时,我会得到一个错误：

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

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);

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

您需要将旧的捆绑中间件(express.bodyparser,express.methodoverrid,express.errorhandler)替换为外部/单独的中间件。错误中的链接给出了这些新中间件的名称。您可能希望检查这些中间件的文档，以检查Express3以来的任何API更改。