Golang 1.6: 使用jQuery.iframe-Transport.js做Ajax文件上传并处理multipart Form_html/css

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Golang 1.6: 使用jQuery.iframe-Transport.js做Ajax文件上传并处理multipart Form_html/css_WEB-ITnose

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Jun 21, 2016 am 08:48 AM

本文测试环境Golang 1.6, jQuery 1.12.3

之前写过一篇文章： jQuery.iframe-Transport.js来发送Ajax文件上传请求对返回JSON的处理，就是讲使用这个jQuery插件时对返回JSON数据的处理，该插件会内置一个这样就可以实现 ajax的 multipart/form-data实现，注意这样做主要是为了兼容低版本浏览器，如果不考虑IE <p>所以代码还是和以前一样，如下(HTML)：</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><form id="avatarForm" enctype="multipart/form-data"> <input id="avatarUpload" name="avatarUpload" type="file" /></form></pre><div class="contentsignin">Copy after login</div></div> <p>JavaScript:</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>// avatarUpload是上面的type = “file”的input元素// 每当选择文件后立即发送Ajax请求$('#avatarUpload').change(function() { //'upload'是具体发送POST请求针对的服务器URL $.ajax('upload', { type: 'POST', files: $('#avatarUpload'), iframe: true, // 注意如果服务器返回结果是JSON，dataType要设置 dataType: 'json' }).done(function(data) { // 这里data是JavaScript对象 console.log('done()', data); }).fail(function() { console.log('fail()'); }).always(function() { console.log('always()'); });});</pre><div class="contentsignin">Copy after login</div></div> <p>接下来在Golang中，处理这个 <form>，首先调用 http.Request的 ParseMultipartForm方法来处理 multipart/form-data，参数是内存内的最大Buffer大小，如果没有错误的话，返回一个 multipart.Form对象，里面的 File属性会包含用户上传文件的信息，具体请参考文档，这里我们通过 logMultipartForm函数简单把里面的数据坐下输出，如下代码： </p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>// 输出multipart.Form内的数据func logMultipartForm(form *multipart.Form) { log.Print("Values:", form.Value) log.Print("Files:") for key := range form.File { headers := form.File[key] for _, header := range headers { log.Printf("Key: %v, Filename: %v, Header: %v", key, header.Filename, header.Header) } }}// 处理POST请求的Handler// Handler的声明可能根据不同路由HTTP框架而不一样func fileUploadHandler(ctx context.Context, w http.ResponseWriter, r *http.Request) { err := r.ParseMultipartForm(1024 * 50) //50kb buffer if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } form := r.MultipartForm logMultipartForm(form) /* 后面省略 */}</pre><div class="contentsignin">Copy after login</div></div> <p>示例输出：</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>Values: map[X-Requested-With:[IFrame] X-HTTP-Accept:[application/json, text/javascript, */*; q=0.01]]Files:Key: avatarUpload, Filename: IMG_1156.jpg, Header: map[Content-Disposition:[form-data; name="avatarUpload"; filename="IMG_1156.jpg"] Content-Type:[image/jpeg]]</pre><div class="contentsignin">Copy after login</div></div>

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