nodejs实现一个简单的 HTTP静态文件服务器（一）

var http = require("http");
var server = http.createServer(function(req, res){
    res.writeHead(200, {‘Content-Type‘ : ‘text/html;charset=utf8‘});
    res.write(‘<div style="font-size:24px;color:red">我们的一个简单的服务器</div>‘);
});
server.listen(‘9090‘, ‘127.0.0.1‘);

var http = require("http");
var url = require("url");
var server = http.createServer(function(req, res){
    var req_path = url.parse(req.url).path;
    var str = ‘<div style="font-size:24px;color:red">我们的请求路径为：‘+req_path+‘</div>‘;
    res.writeHead(200, {‘Content-Type‘ : ‘text/html;charset=utf8‘});
    res.write(str);
});
server.listen(‘9090‘, ‘127.0.0.1‘);

var http = require("http");
var url = require("url");
var fs = require("fs");
var server = http.createServer(function(req, res){
    var req_path = url.parse(req.url).path;
    var filepath = __dirname + req_path;
    
    fs.exists(filepath, function(exists){
        if(exists){
            fs.stat(filepath, function(err, stats){
                if(err){
                    res.writeHead(500, {‘Content-Type‘ : ‘text/html;charset=utf8‘});
                    res.end(‘<div styel="color:black;font-size:22px;">server error</div>‘);
                }else{
                    if(stats.isFile()){
                        var file = fs.createReadStream(filepath);
                        res.writeHead(200, {‘Content-Type‘ : ‘text/html;charset=utf8‘});
                        file.pipe(res);
                    }else{
                        fs.readdir(filepath, function(err, files){
                            var str = ‘‘;
                            for(var i in files){
                                str += files[i] + ‘<br/>‘;
                            }
                            res.writeHead(200, {‘Content-Type‘ : ‘text/html;charset=utf8‘});
                            res.write(str);
                        });
                    }
                }
            });
        }else{
            res.writeHead(404, {‘Content-Type‘ : ‘text/html;charset=utf8‘});
            res.end(‘<div styel="color:black;font-size:22px;">404 not found</div>‘);
        }
    });
});
server.listen(‘9090‘, ‘127.0.0.1‘);