一个简单的node.js文件服务器
//加载所需要的模块
var http = require('http');
var processRequest = require('./server');
//创建服务，这里很机智的把对response和request的处理封装成一个匿名函数，传入createServer中
//也可以直接在里面写，但是看起来不是很整洁
var httpServer = http.createServer((req, res) => {
processRequest(req, res);
});
var port = 8888;
//指定一个监听的接口
httpServer.listen(port, function() {
console.log(`app is running at port:${port}`);
});
module.exports = {
"css": "text/css",
"gif": "image/gif",
"html": "text/html",
"ico": "image/x-icon",
"jpeg": "image/jpeg",
"jpg": "image/jpeg",
"js": "text/javascript",
"json": "application/json",
"pdf": "application/pdf",
"png": "image/png",
"svg": "image/svg+xml",
"swf": "application/x-shockwave-flash",
"tiff": "image/tiff",
"txt": "text/plain",
"wav": "audio/x-wav",
"wma": "audio/x-ms-wma",
"wmv": "video/x-ms-wmv",
"xml": "text/xml",
'txt': 'text/plain',
'md': 'text/plain',
'': 'text/plain',
};
var url = require('url');
var fs = require('fs');
var path = require('path');
var mime = require('./mime');
function processRequest(request, response) {
//request里面切出标识符字符串
var requestUrl = request.url;
//url模块的parse方法 接受一个字符串，返回一个url对象,切出来路径
var pathName = url.parse(requestUrl).pathname;
//对路径解码，防止中文乱码
var pathName = decodeURI(pathName);
//解决301重定向问题，如果pathname没以/结尾，并且没有扩展名
if (!pathName.endsWith('/') && path.extname(pathName) === '') {
pathName += '/';
var redirect = "http://" + request.headers.host + pathName;
response.writeHead(301, {
location: redirect
});
//response.end方法用来回应完成后关闭本次对话，也可以写入HTTP回应的具体内容。
response.end();
};
//获取资源文件的绝对路径
var filePath = path.resolve(__dirname + pathName);
console.log(filePath);
//获取对应文件的文档类型
//我们通过path.extname来获取文件的后缀名。由于extname返回值包含”.”，所以通过slice方法来剔除掉”.”，
//对于没有后缀名的文件，我们一律认为是unknown。
var ext = path.extname(pathName);
ext = ext ? ext.slice(1) : 'unknown';
//未知的类型一律用"text/plain"类型
var contentType = mime[ext] || "text/plain";
fs.stat(filePath, (err, stats) => {
if (err) {
response.writeHead(404, { "content-type": "text/html" });
response.end("<h1>404 Not Found</h1>");
};
//没出错 并且文件存在
if (!err && stats.isFile()) {
response.writeHead(200, { "content-type": contentType });
//建立流对象，读文件
var stream = fs.createReadStream(filePath);
//错误处理
stream.on('error', function() {
response.writeHead(500, { "content-type": contentType });
response.end("<h1>500 Server Error</h1>");
});
//读取文件
stream.pipe(response,true);
};
//如果路径是目录
if (!err && stats.isDirectory()) {
var html = " <head><meta charset = 'utf-8'/></head>";
//读取该路径下文件
fs.readdir(filePath, (err, files) => {
if (err) {
console.log("读取路径失败！");
} else {
for (var file of files) {
if (file === "index.html") {
response.writeHead(200, { "content-type": "text/html" });
response.end(file);
break;
};
html += `<div><a href='${file}'>${file}</a></div>`;
console.log(html);
}
response.writeHead(200, { "content-type": "text/html" });
response.end(html);
};
});
};
});
};
module.exports = processRequest;
