想用jsp显示文件列表 [英] Want to display file list using jsp
问题描述
< html>
< body>
< form id =file_upload_formmethod =postenctype =multipart / form-dataaction =upload.java>
< div style =float：center>
< center>
选择一个文件：
< input type =filename =first/>
< input type =submitname =buttonvalue =upload/>
< / center>
< / div>
< center>
< / br>
< / br>
< iframe id =uploadstyle =background-color：white; width = 90％height = 80％>< / iframe>
< / center>
< / form>
< / body>
< / html>
提交请求时，我想将上传的文件存储在驱动器中（ex.c：/上传）和iframe（id = upload）应显示文件夹（c：/ upload）中的文件。有人知道我在哪里可以找到一些示例代码，显示如何完成这项工作？
处理HTTP multipart / form-data servlet中的请求，请使用 Apache Commons FileUpload 。您应该将上传的文件放在 的FileItem 。它有一个 write（）方法。 String filename = FilenameUtils。的getName（fileItem.getName（））;
fileItem.write（new File（c：/ upload，filename））; //名称必须是唯一的！
要显示文件夹中的文件列表，您需要使用
java.io.File API，它有一个 listFiles（）方法，它返回特定路径中所有文件（路径）的列表。在预处理 servlet 中执行此操作，该请求将请求转发给JSP以显示列表。 File [] files = new File（c：/ upload）。listFiles（）;
request.setAttribute（files，files）;
request.getRequestDispatcher（/ WEB-INF / uploads.jsp）。forward（request，response）;
在 /WEB-INF/uploads.jsp 文件使用 JSTL < c：forEach> 来迭代通过 File [] 。
< c：forEach items = $ {files}var =file>
< c：out value =$ {file.name}/> （$ {file.length / 1024} KB）< br />
< / c：forEach>
请注意，这当然可以用于更多（UI）微调，但这取决于您。我假设你已经知道HTML / JSP / Servlet的基础知识。
I am new to netbeans with glassfish server.My html code looks like,
<html>
<body>
<form id="file_upload_form" method="post" enctype="multipart/form-data" action="upload.java">
<div style="float:center">
<center>
Select a file:
<input type="file" name="first" />
<input type="submit" name="button" value="upload" />
</center>
</div>
<center>
</br>
</br>
<iframe id="upload" style="background-color:white;" width=90% height=80%></iframe>
</center>
</form>
</body>
</html>
when the request is submitted,i want to store the uploaded file in drive(ex.c:/upload) and the iframe(id=upload) should display the files in folder(c:/upload). Does anyone know where I can find some sample code that shows how this is done?
To process HTTP multipart/form-data requests in a servlet, use Apache Commons FileUpload. You should end up with the uploaded file in a FileItem. It has a write() method.
String filename = FilenameUtils.getName(fileItem.getName());
fileItem.write(new File("c:/upload", filename)); // Name must be unique!
For the usage guide and more code examples, just check their User Guide.
To display a list of files in the folder, you need to use the java.io.File API, it has a listFiles() method which returns a list of all files (paths) in a certain path. Do it in a preprocessing servlet which forwards the request to a JSP to display the list.
File[] files = new File("c:/upload").listFiles();
request.setAttribute("files", files);
request.getRequestDispatcher("/WEB-INF/uploads.jsp").forward(request, response);
In the /WEB-INF/uploads.jsp file use JSTL <c:forEach> to iterate over the File[].
<c:forEach items="${files}" var="file">
<c:out value="${file.name}" /> (${file.length / 1024}KB)<br/>
</c:forEach>
Note that this is of course open for more (UI) finetuning, but that's up to you. I assume that you already know the HTML/JSP/Servlet basics.
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