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learn express |
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<h2 id="深入了解express"><a href="#深入了解express" class="headerlink" title="深入了解express"></a>深入了解express</h2><h3 id="构建一个-express-实例"><a href="#构建一个-express-实例" class="headerlink" title="构建一个 express 实例"></a>构建一个 express 实例</h3><blockquote>
<p>cnpm i express-generator -g</p>
</blockquote>
<h3 id="目录结构"><a href="#目录结构" class="headerlink" title="目录结构"></a>目录结构</h3><pre><code class="json">.
├── app.js
├── bin
│ └── www
├── package.json
├── public
│ ├── images
│ ├── javascripts
│ └── stylesheets
│ └── style.css
├── routes
│ ├── index.js
│ └── users.js
└── views
├── error.jade
├── index.jade
└── layout.jade
7 directories, 9 files
</code></pre>
<h3 id="中间件"><a href="#中间件" class="headerlink" title="中间件"></a>中间件</h3><h4 id="应用级中间件"><a href="#应用级中间件" class="headerlink" title="应用级中间件"></a>应用级中间件</h4><pre><code class="js">&lt;!-- 没有挂载路径 --&gt;
app.use(function (req, res, next) {
...
next()
}, function (req, res, next) {
console.log(&#39;Request Type:&#39;, req.method);
next();
})
&lt;!-- 挂载路径的中间件 --&gt;
app.use(&#39;/user/&#39;, function(req, res, next){
...
next()
})
路由和句柄函数处理getpost请求
app.get(&#39;/&#39;, function() {
res.send(&#39;USER&#39;)
})
</code></pre>
<h4 id="路由级中间件"><a href="#路由级中间件" class="headerlink" title="路由级中间件"></a>路由级中间件</h4><blockquote>
<p>var app = express()<br>var router = express.Router()</p>
</blockquote>
<pre><code class="js">和上面类似,只是写法不同
router.use(&#39;/&#39;, function(req, res, next) {
...
next()
})
&lt;!-- 此处理是在同一个文件夹下 --&gt;
app.use(&#39;/&#39;, router)
</code></pre>
<h4 id="错误处理中间件"><a href="#错误处理中间件" class="headerlink" title="错误处理中间件"></a>错误处理中间件</h4><pre><code class="js">app.use(function (err, req, res, next) {
console.error(err.stack);
res.status(500).send(&#39;Something broke!&#39;);
});
</code></pre>
<h4 id="内置中间件"><a href="#内置中间件" class="headerlink" title="内置中间件"></a>内置中间件</h4><blockquote>
<p>唯一内置中间件express.static()</p>
</blockquote>
<ul>
<li>dotfiles</li>
</ul>
<p>是否对外输出文件名以点(.)开头的文件。<br>可选值为 “allow”、“deny” 和 “ignore”<br>默认ignore</p>
<ul>
<li>etag</li>
</ul>
<p>是否启用 etag 生成<br>默认true</p>
<ul>
<li>extensions</li>
</ul>
<p>设置文件扩展名备份选项<br>默认:[]</p>
<ul>
<li>index</li>
</ul>
<p>发送目录索引文件,设置为 false 禁用目录索引。<br>Mixed<br>默认“index.html”</p>
<ul>
<li>lastModified</li>
</ul>
<p>设置 Last-Modified 头为文件在操作系统上的最后修改日期。可能值为 true 或 false。<br>默认true</p>
<ul>
<li>maxAge</li>
</ul>
<p>以毫秒或者其字符串格式设置 Cache-Control 头的 max-age 属性。<br>默认0</p>
<ul>
<li>redirect</li>
</ul>
<p>当路径为目录时,重定向至 “/”。<br>默认true</p>
<ul>
<li>setHeaders</li>
</ul>
<p>设置 HTTP 头以提供文件的函数。<br>Function</p>
<pre><code class="js">app.use(express.static(&#39;public&#39;, options));
</code></pre>
<h4 id="第三方中间件"><a href="#第三方中间件" class="headerlink" title="第三方中间件"></a>第三方中间件</h4><h5 id="cookie-parser"><a href="#cookie-parser" class="headerlink" title="cookie-parser"></a>cookie-parser</h5><p>用于解析 cookie 的中间件</p>
<h5 id="body-parser"><a href="#body-parser" class="headerlink" title="body-parser"></a>body-parser</h5><p>用于解析request body部分并对上传内容大小作出限制</p>
<pre><code class="js">app.use(bodyParser.json({ limit: &#39;50mb&#39; }));
app.use(bodyParser.urlencoded({ limit: &#39;50mb&#39;, extended: true }));
</code></pre>
<h4 id="canvas"><a href="#canvas" class="headerlink" title="canvas"></a>canvas</h4><pre><code class="js"> var base64Data = req.body.imgData;
var img = new Canvas.Image;
img.onload = function(){
var w = img.width;
var h = img.height;
var canvas = new Canvas(w, h);
var ctx = canvas.getContext(&#39;2d&#39;);
ctx.drawImage(img, 0, 0);
var out = fs.createWriteStream(__dirname + &#39;/crop.jpg&#39;);
var stream = canvas.createJPEGStream({
bufsize : 2048,
quality : 80
});
stream.on(&#39;data&#39;, function(chunk){
out.write(chunk);
});
stream.on(&#39;end&#39;, function(){
out.end();
res.send(&quot;上传成功!&quot;);
});
}
img.onerror = function(err){
res.send(err);
}
img.src = base64Data;
</code></pre>
<h4 id="fs模块-node自带模块"><a href="#fs模块-node自带模块" class="headerlink" title="fs模块 (node自带模块)"></a>fs模块 (node自带模块)</h4><p>对文件执行读取和写入</p>
<pre><code class="js">function(req, res, next) {
if (req.body.formFile) {
// 对象转换为字符串
&lt;!-- 先取出base64码 --&gt;
var base64Data = req.body.formFile.replace(/^data:image\/\w+;base64,/, &quot;&quot;);
&lt;!-- 将base64码进行转码 --&gt;
var dataBuffer = new Buffer(base64Data, &#39;base64&#39;);
&lt;!-- 将文件导出为图片格式 --&gt;
fs.writeFile(&quot;out.png&quot;, dataBuffer, function (err) {
if (err) {
res.send(err);
} else {
res.send(&quot;保存成功!&quot;);
}
});
}
}
</code></pre>
<p>未完待续…</p>
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