H5 file asynchronous upload

This time I will bring you H5 file asynchronous upload, what are the precautions for H5 file asynchronous upload, the following is a practical case, let's take a look.

1 Introduction

Developing File upload function is never a pleasant thing, especially asynchronous upload, I have used iframe and Flash uploading solutions, and they all feel very awkward. This article briefly introduces the use of Html5's FormData to implement asynchronous upload of files, and can also implement upload progress bar and file size verification. The server uses the springMVC solution for processing.

2 Html code

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

3 JQuery upload

$("#submit-btn").on('click', 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！");
        }
    });
});

4 JQuery file size verification

The control of file size and corresponding behavior needs to be handled by yourself as needed. This method is just an example method.

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

5 JQuery progress bar

Add xhr to the ajax method to control the upload progress. The progress bar can also use the progress of html5. Use other progress bars. Displaying and hiding the progress bar needs to be handled by yourself. This method only briefly introduces the basic control of the progress bar.

xhr: function() {
    var myXhr = $.ajaxSettings.xhr();
    if (myXhr.upload) {
        myXhr.upload.addEventListener('progress', function(e) {
            if (e.lengthComputable) {
                $('progress').attr({
                    value: e.loaded,
                    max: e.total,
                });
            }
        } , false);
    }
    return myXhr;
}

6 springMVC server

6.1 maven dependency

<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>

6.2 servlet-context.xml

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

6.3 Controller

Sample program does not provide the corresponding code for file verification, storage and processing .

@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";
}

7 Compatibility

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

8 Recommended reading

If you are not satisfied with the above solution, it is recommended to use the following solution:

JQuery File Uploader

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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