JSP 表单中的输入 TYPE TEXT 值 (enctype="multipart/form-data") 返回 null [重复]

我需要上传图片：

<form method="post" action="hi.iq/register.jsp" enctype="multipart/form-data">
    Name: <input type="text" name="name" value="J.Doe">
    file: <input type="file" name="file-upload">
    <input type="submit">
</form> 

在我的servlet中我给了

response.setContentType("text/html");

PrintWriter out = response.getWriter();    

String name = request.getParameter("name");

System.out.println("user_id========= "+name);

但价值name返回为NULL.

Pls Help

Try <input type="text" id="name" name="name" value="J.Doe">.

Edit:

使用 Apache Commons Fileupload 的示例，如 David 的回答所建议的：

FileItemFactory factory = new DiskFileItemFactory();

// Set factory constraints
// factory.setSizeThreshold(yourMaxMemorySize);
// factory.setRepository(yourTempDirectory);

// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload( factory );
// upload.setSizeMax(yourMaxRequestSize);

// Parse the request
List<FileItem> uploadItems = upload.parseRequest( request );

for( FileItem uploadItem : uploadItems )
{
  if( uploadItem.isFormField() )
  {
    String fieldName = uploadItem.getFieldName();
    String value = uploadItem.getString();
  }
}