Question

当我使用enctype =“multipart / form-data”进行上传和输入时，许多数据都为null，如果删除enctype =“multipart / form-data”，它可以获取数据但是上传为null。我的代码html

<form action="createvendor" method="post" enctype="multipart/form-data">
    <div>
        <label> <input placeholder="Username:" type="text"
                       name="username" tabindex="1" >
        </label>
    </div>
    <div>
        <label> <input placeholder="Password" type="password"
                       name="password" tabindex="2" >
        </label>
    </div>
    <div>
        <label> <input placeholder="Firstname:" type="text"
                       name="firstname" tabindex="3" >
        </label>
    </div>
    <div>
        <label> <input placeholder="Lastname:" type="text"
                       name="lastname" tabindex="4" >
        </label>
    </div>
    <div>
        <label> <input placeholder="ID card:" type="text"
                       name="personalID" tabindex="5" maxlength="13"
                       onKeyUp="if(isNaN(this.value)){ alert('กรุณากรอกตัวเลข 13 หลักเท่านั้น'); this.value='';}"
                >
        </label>
    </div>
    <div class="registration_form">
        <div style="position: relative;">
            <a class='btn btn-primary'> Choose your ID card picture <input
                    required class="form-control" type="file"
                    style='position: absolute; z-index: 2; top: 0; left: 0; filter: alpha(opacity = 0); -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)"; opacity: 0; background-color: transparent; color: transparent;'
                    name="picturePersonalID"
                    onchange='$("#upload-file-info").html($(this).val());'>
            </a>&nbsp; <span class='label label-info' id="upload-file-info"></span>
        </div>
    </div>
</form>

我想上传并输入许多数据并将数据发送到servlet。

Answer 1

如果您需要上传稍后要添加的文件，那么您应该在servlet上放置@MultipartConfig注释，以便request.getParameter（）可以工作，并且所有上传的文件都可以通过request.getPart（）。@MultipartConfig(maxFileSize = 1073741824)

Answer 2

@MultipartConfig（maxFileSize = 1073741824）将此注释放在方法上

JSP enctype =“multipart / form-data”获取空数据

2 个答案: