express中間層搭建前端項目2

tianhang 發(fā)布于2019-08-22 18:16 / 3159人閱讀

摘要：上面一片文章已經(jīng)介紹怎樣創(chuàng)建服務(wù)端服務(wù)，這篇將搭建路由第一章搭建服務(wù)配置引入相關(guān)中間件文件讀取壓縮處理異常設(shè)置模板引擎使用相關(guān)中間件日志請求體解析中間對傳入的進(jìn)行解析后賦值給引入文件里面的靜態(tài)資源包括引入路由文件路由文件讀取抓取錯誤信

上面一片文章已經(jīng)介紹怎樣創(chuàng)建nodejs服務(wù)端服務(wù)，這篇將express搭建路由第一章搭建nodejs服務(wù)

配置app.js引入相關(guān)中間件

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");

//文件讀取
var fs = require("fs");

//gzip壓縮
var compression = require("compression");

//處理異常
var domain = require("domain");

var app = express();

設(shè)置模板引擎

// view engine setup
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "ejs");

使用相關(guān)中間件

// uncomment after placing your favicon in /public
app.use(favicon(path.join(__dirname, "public", "favicon.ico")));
//log日志
app.use(logger("dev"));
//HTTP請求體解析中間
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
    extended: false
}));
//對http傳入的cookie進(jìn)行解析后賦值給req.cookies
app.use(cookieParser());
//引入public文件里面的靜態(tài)資源包括css,js,image etc.
app.use(express.static(path.join(__dirname, "public")));

引入路由文件

//路由文件讀取
var file = fs.readdirSync("./routes");
for (var i in file) {
    var name = file[i].replace(".js", "");
    require("./routes/" + name)(app, domain);
}

抓取錯誤信息

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

錯誤處理，渲染404頁面

app.use(function(err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get("env") === "development" ? err : {};
    // render the error page
    res.status(err.status || 500);
    res.statusCode = 404;
    res.render("htmlerror");
});

拋出模塊