如何通过多部门的请求传递参数 [英] How to pass parameter in multipart post request
问题描述
Servlet代码
request.getparameter（fname）//我无法获取值。
HTML代码
< html>
< head>
< title>档案上传表格< / title>
< / head>
< body>
< h3>档案上载：< / h3>
选择要上传的文件：< br />
< form action =UploadServletmethod =post
enctype =multipart / form-data>
< input type =textname =fnamesize =50/>
< input type =filename =filesize =50/>
< input type =submitvalue =Upload File/>
< / form>
< / body>
< / html>
我的问题是：如何传递 fname 参数中的多部分发布请求
简短的回答：在请求的 Part 中找到 fname 。
<对于多部分类型的请求，即使简单的
< input type =text> 字段值也被放置在部分中。你必须迭代由 HttpServletRequest.getParts（）返回的部分对象，并根据它们的<$ （p：request.getParts（））{c $ c> name property：
if（filename.equals（p.getName（））） ））{
...
}
}
进一步复杂的东西，部分的内容是可用的 InputStream - Part.getInputStream（） - 所以你将有做一点改造流 byte [] → 字符串来获得值。
Servlet code
request.getparameter("fname") //I can't able to get value.
HTML code
<html>
<head>
<title>File Uploading Form</title>
</head>
<body>
<h3>File Upload:</h3>
Select a file to upload: <br />
<form action="UploadServlet" method="post"
enctype="multipart/form-data">
<input type="text" name="fname" size="50" />
<input type="file" name="file" size="50" />
<input type="submit" value="Upload File" />
</form>
</body>
</html>
My question is : How to pass fname parameter in multipart post request?
Short answer: you will find the fname in the Parts of the request.
Long answer: For multipart type requests, even the simple <input type="text"> field values are placed in parts. You will have to iterate over the Part objects returned by HttpServletRequest.getParts() and handle them according to their name property:
for( Part p : request.getParts() ) {
if( "fname".equals(p.getName()) ) {
...
}
else if( "file".equals(p.getName()) ) {
...
}
}
To complicate things further, the content of the part is available as InputStream - Part.getInputStream() - so you will have to do a little transforming stream → byte[] → String to get the value.
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