node 静态文件处理
一般后端进行静态文件处理都是使用 Apache nginx 等静态 web 服务器,但是既然使用 node 了,就用 node 实现以下静态服务器吧.
之前弄了不少充满艺术的数据,就弄个页面进行艺术欣赏吧
app.js
"/": (request, response) => {
response.writeHead(200, { "content-type": "text/html;charset=utf-8" });
let stream = fs.createReadStream(
path.join(__dirname, "/views/index.html")
);
stream.on("error", function() {
response.writeHead(500, { "content-type": "text/html;charset=utf-8" });
response.end("<h1>500 Server Error</h1>");
});
stream.pipe(response);
},
views/index.html/index.js/index.css
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>时尚风范</title>
<link rel="stylesheet" href="./index.css" type="text/css" />
<script src="./index.js"></script>
</head>
<body>
<div class="img-list">
<div class="header">我是写真集</header>
</div>
</body>
</html>
但是打开之后什么都不能看,css 和 js 在控制台都是 404 显示.因为服务器没有写相应的代码去处理这些文件,所以接收到请求,服务器也是一脸茫然,不知道究竟要干什么.
所有我们要对请求的资源做出相对应的回答,那怕是个 404
添加 css 和 js 的支持
"/index.css": (request, response) => {
response.writeHead(200, { "content-type": "text/css;chartset=utf-8" });
let stream = fs.createReadStream(
path.join(__dirname, "/views/index.css")
);
stream.on("error", function() {
response.writeHead(500, { "content-type": "text/html;charset=utf-8" });
response.end("<h1>500 Server Error</h1>");
});
stream.pipe(response);
},
"/index.js": (request, response) => {
response.writeHead(200, {
"content-type": "text/javasvript;chartset=utf-8"
});
let stream = fs.createReadStream(
path.join(__dirname, "/views/index.js")
);
stream.on("error", function() {
response.writeHead(500, { "content-type": "text/html;charset=utf-8" });
response.end("<h1>500 Server Error</h1>");
});
stream.pipe(response);
},
这样就正常的加载和执行 css 和 js 了,但是代码灵活性不够,重复率太高.
静态资源服务器
区分路由
...
if (pathname !== "/favicon.ico") {
if (path.extname(pathname) === "") {
router(pathname)(request, response);
} else {
assets(pathname)(request, response);
}
}
...
添加静态资源处理
function assets(p) {
let ext = path.extname(p);
ext = ext ? ext.slice(1) : "unknown";
let contentType = getMime(ext);
contentType += ";charset=utf-8";
let filePath;
if (/image/.test(contentType)) {
filePath = path.join(static_path, p);
} else {
filePath = path.join(public_path, p);
}
return async function(request, response) {
try {
let stats = await stat(filePath);
if (stats && stats.isFile()) {
readFile(response, filePath, contentType);
}
} catch (err) {
console.log(err);
}
};
}
我们需要根据文件类型做相应处理
对不同的文件进行不同的响应头处理
module.exports = {
getMime: function(ext) {
let mime = {
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"
};
return mime[ext] || "text/plain";
}
};
加载相应的静态文件
function readFile(response, filePath, contentType) {
response.writeHead(200, { "content-type": contentType });
let stream = fs.createReadStream(filePath);
stream.on("error", function() {
response.writeHead(500, { "content-type": contentType });
response.end("<h1>500 Server Error</h1>");
});
stream.pipe(response);
}
index.js
window.onload = function() {
let path =
"http://127.0.0.1:9527/mrw/%E5%B0%8F%E6%B2%AB%E7%90%B3%E3%80%8A%E8%8B%8F%E6%A2%85%E5%B2%9B%E6%97%85%E6%8B%8D%E5%86%99%E7%9C%9F%E3%80%8B%20[%E8%8A%B1%E3%81%AE%E9%A2%9CHuaYan]%20Vol.057%20%E5%86%99%E7%9C%9F%E9%9B%86/%E5%B0%8F%E6%B2%AB%E7%90%B3%E3%80%8A%E8%8B%8F%E6%A2%85%E5%B2%9B%E6%97%85%E6%8B%8D%E5%86%99%E7%9C%9F%E3%80%8B%20[%E8%8A%B1%E3%81%AE%E9%A2%9CHuaYan]%20Vol.057%20%E5%86%99%E7%9C%9F%E9%9B%86_image";
let suffix = ".jpg";
let content = document.createElement("div");
let body = document.getElementsByTagName("body")[0];
content.setAttribute("class", "content");
for (let i = 0; i < 56; i++) {
let item = document.createElement("img");
item.setAttribute("src", `${path}${i}${suffix}`);
content.appendChild(item);
}
body.appendChild(content);
};
当然,正常的写真集不是这样做的,而是通过数据库存储硬盘路径存放地址,然后返回给前端 url+path 的形式,路径也不会这么长.这里只是处理静态文件.