How to upload a file using the PUT method via Ajax in Spring MVC?

问题

I have the following js code to send an Ajax request to a URL which maps a method in Spring MVC.

function update(id)
{
    $.ajax({
        datatype:"json",
        type: "put",
        url: "/wagafashion/ajax/TempAjax.htm",
        data: "id=" + id+"&t="+new Date().getTime(),
        success: function(response)
        {
            alert(response);                        
        },
        error: function(e)
        {
            alert('Error: ' + e);
        }
    });
}

and the following is the simple Spring form that has only a file browser and a button.

<form:form id="mainForm" name="mainForm" method="post" action="Temp.htm" enctype="multipart/form-data" commandName="tempBean">
    <input type="file" id="myFile" name="myFile"/>
    <input type="button" id="btnSubmit" name="btnSubmit" onclick="update(1);" value="Submit"/>
    <!--The js function is called when this button is clicked supplying 1 as id.-->
</form:form>

The following method in Spring controller is invoked when that button is pressed.

@RequestMapping(method={RequestMethod.PUT}, value={"ajax/TempAjax"})
public @ResponseBody String update(HttpServletRequest request, HttpServletResponse response)
{
    System.out.println(ServletFileUpload.isMultipartContent(request));
    return "Message";
}

The method call ServletFileUpload.isMultipartContent(request) however returns false.

---

When I modify the method as follows,

@RequestMapping(method={RequestMethod.PUT}, value={"ajax/TempAjax"}, headers={"content-type=multipart/form-data"})
public @ResponseBody String update(@RequestParam MultipartFile file, HttpServletRequest request, HttpServletResponse response)
{
    System.out.println(ServletFileUpload.isMultipartContent(request));
    return "Message";
}

the error section in the js code always alerts Error: [object Object]. The same thing happens even if the POST method is used, in this case.

How to pass multipart contents via Ajax (precisely using the PUT method)?

回答1:

I can't really see how this is meant to post the multipart file to the server? The data just contains the id and a time.

Try something like:

function update(id)
{
    $.ajax({
        datatype:"json",
        type: "put",
        url: "/wagafashion/ajax/TempAjax.htm",
        data: $('#mainForm').serialize(),
        success: function(response)
        {
            alert(response);                        
        },
        error: function(e)
        {
            alert('Error: ' + e);
        }
    });
}

来源：https://stackoverflow.com/questions/13648599/how-to-upload-a-file-using-the-put-method-via-ajax-in-spring-mvc