给express的router封装一下，使得可以按照目录指定router，这样之后就可以直接在相应的目录下直接添加文件，就可以访问，而无需关注router的问题。

router-express-usage.js

var routerExpress = require("router-express"),
    express = require("express");
    
var app = express();

routerExpress.express(app);

routerExpress.add("/restart")
             .add("/api/*.json", "app/api")
             .add("/tool/*", "app/tool")
             .add("/test/*")
             .add("/");

router-express.js

var url = require("url");

var expressApp = null;

module.exports = {
    express : function(app){
        expressApp = app;
        return this;
    },
    add : function(router, folderpath /* 指定文件目录[option] */){
        var response = function(req, res){
            var pathname = url.parse(req.url).pathname.replace(/(\.json)$/,""),
                filename = "",
                tmpArr = null;
            
            pathname = (pathname === "/") ? "/app/page/index" : pathname;
            try {
                if(folderpath){
                    tmpArr = pathname.split("/");
                    filename = tmpArr[tmpArr.length - 1];
                    require("../" + folderpath + "/" + filename).showPage(req, res);
                }else{
                    require(".." + pathname).showPage(req, res);  
                }
            } catch (e) {
                res.writeHead(500, {"Content-Type": "text/plain"});
                res.write(e.message);
                res.end();
            }            
        };
        
        expressApp.get(router, response);
        expressApp.post(router, response);
        return this;
    }
}

sample.js

//比如这是某个目录下新建的一个文件，只要按照下面的方式，exports一个showPage方法出来，作为主入口函数，并response send。
exports.showPage = function(req,res){
	res.send(200, "hello world");
}