app.js

//依赖的包
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

/*
 *路由，主要用于http请求转发
 *开发可以在此添加新的http请求路径；
 */
var routes = require('./route/index');
var transRequest = require('./route/transRequest');

var app = express(); //这个应用是express实例

// 设置页面引擎（ejs）
// 设置为.html 
var ejs = require('ejs');
app.engine('.html', ejs.__express);
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'html');

//app需要注册的内容
// uncomment after placing your favicon in /public
// app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
//limit属性限制请求参数大小 ，否则报413 request entity too large错误
app.use(bodyParser.json({ limit: '50mb' }));
app.use(bodyParser.urlencoded({ limit: '50mb', extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

/*
 *注册路由配置
 */
app.use('/', routes);
app.use('/transRequest', transRequest);


// catch 404 and forward to error handler
app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
    app.use(function(err, req, res, next) {
        res.status(err.status || 500);
        res.render('error', {
            message: err.message,
            error: err
        });
    });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
        message: err.message,
        error: {}
    });
});

module.exports = app;