Home Web Front-end H5 Tutorial Using Html5 to implement asynchronous file upload function code example

Using Html5 to implement asynchronous file upload function code example

May 29, 2017 am 10:03 AM
html5 upload files

本文简单介绍利用Html5的FormData实现文件的异步上传,还可以实现上传进度条和文件大小验证等,代码简单易懂,非常不错,具有参考借鉴价值,需要的的朋友参考下吧

1 简介

开发文件上传功能从来不是一件愉快的事,异步上传更是如此,使用过iframe和Flash的上传方案,也都感觉十分的别扭。本文简要简绍利用Html5的FormData实现文件的异步上传,还可以实现上传进度条和文件大小验证等。服务端使用springMVC的方案进行处理。

2 Html代码

<form id="myForm">
    <input type="file" id="u_photo" name="u_photo" />
    <input type="button" id="submit-btn" value="上传" />
</form>
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3 JQuery上传

$("#submit-btn").on(&#39;click&#39;, function() {
    $.ajax({
        url:"/test/upload",
        type:"post",
        data:new FormData($("#myForm").get(0)),
        //十分重要,不能省略
        cache: false,
        processData: false,
        contentType: false,
        success: function () {
            alert("上传成功!");
        }
    });
});
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4 JQuery文件大小验证

文件大小的及相应行为的控制,需根据需要自行处理,本方法只是示例方法。

$(&#39;#u_photo&#39;).on(&#39;change&#39;, function() {
    var file = this.files[0];
    if (file.size > 1024*1000) {
        alert(&#39;文件最大1M!&#39;)
    }
});
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5 JQuery进度条

在ajax方法中加入xhr即可控制上传进度,进度条可以使用html5的progress也可使用其它的进度条。显示及隐藏进度条需要自行处理,本方法只是简单介绍了进度条的基本控制。

xhr: function() {
    var myXhr = $.ajaxSettings.xhr();
    if (myXhr.upload) {
        myXhr.upload.addEventListener(&#39;progress&#39;, function(e) {
            if (e.lengthComputable) {
                $(&#39;progress&#39;).attr({
                    value: e.loaded,
                    max: e.total,
                });
            }
        } , false);
    }
    return myXhr;
}
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6 springMVC服务端

6.1 maven依赖

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.5</version>
</dependency>
<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.2</version>
</dependency>
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6.2 servlet-context.xml

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />
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6.3 Controller

示例程序,并未给出文件验证,存储及处理的相应代码。

@RequestMapping(value="/test/upload",method = RequestMethod.POST)
@ResponseBody
public String upload(@RequestParam("u_photo") MultipartFile u_photo) {
    System.out.println("u_photo="+u_photo.getSize());
    return "ok";
}
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7 兼容性

IE 10+, Firefox 4.0+, Chrome 7+, Safari 5+, Opera 12+

8 推荐阅读

如果对上述方案不满意,推荐使用如下的解决方案:

JQuery File Uploader

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