[英]how to upload a file in server using multipart/form-data?
我已經用jsp編寫了一個程序，可以將文件上傳到在webcontent內創建的名為images的文件夾中，但是我的文件沒有被上傳。 請需要幫助。
<form action="upload_images_result.jsp" method="post">
<div align="left">
Select a file: <input type="file" name="file" size="50"
enctype="multipart/form-data" placeholder="Upload Your Image" />
</div>
<br>
<div>
<input type="submit" value="Upload File" />
</div>
</form>
upload_images_result.jsp
<%
File file;
int maxFileSize = 5000 * 1024;
int maxMemSize = 5000 * 1024;
//ServletContext context = pageContext.getServletContext();
String filePath = "D:\\Students_Server\\WebContent\\Images";
// Verify the content type
String contentType = request.getContentType();
if ((contentType.indexOf("multipart/form-data") >= 0)) {
DiskFileItemFactory factory = new DiskFileItemFactory();
// maximum size that will be stored in memory
factory.setSizeThreshold(maxMemSize);
// Location to save data that is larger than maxMemSize.
factory.setRepository(new File(
filePath "));
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// maximum file size to be uploaded.
upload.setSizeMax(maxFileSize);
try {
// Parse the request to get file items.
List fileItems = upload.parseRequest(request);
// Process the uploaded file items
Iterator i = fileItems.iterator();
out.println("<html>");
out.println("<head>");
out.println("<title>JSP File upload</title>");
out.println("</head>");
out.println("<body>");
while (i.hasNext()) {
FileItem fi = (FileItem) i.next();
if (!fi.isFormField()) {
// Get the uploaded file parameters
String fieldName = fi.getFieldName();
String fileName = fi.getName();
boolean isInMemory = fi.isInMemory();
long sizeInBytes = fi.getSize();
// Write the file
if (fileName.lastIndexOf("\\") >= 0) {
file = new File(filePath +
fileName.substring(fileName.lastIndexOf("\\")));
} else {
file = new File(filePath +
fileName.substring(fileName.lastIndexOf("\\") + 1));
}
fi.write(file);
out.println("Uploaded Filename: " + filePath + fileName + "
<br>");
}
}
out.println("</body>");
out.println("</html>");
} catch (Exception ex) {
System.out.println(ex);
}
} else {
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet upload</title>");
out.println("</head>");
out.println("<body>");
out.println("<p>No file uploaded</p>");
out.println("</body>");
out.println("</html>");
}
%>
輸出被打印為“沒有文件上傳”
謝謝
您在html中使用了錯誤的屬性。 屬性enctype =“ multipart / form-data”僅在標簽形式中使用 ，如下所示。
<form action="upload_images_result.jsp"
method="post"
enctype="multipart/form-data">
</form>
或者，您可以在標記輸入中使用type =“ submit” ，如下所示。
<form action="upload_images_result.jsp"
method="post">
<input type="submit"
formenctype="multipart/form-data"
value="Submit as Multipart/form-data"/>
</form>
發出POST請求時，必須以某種方式對構成請求主體的數據進行編碼。
HTML表單提供了三種編碼方法。
當表單包含任何<input type="file">元素時，請使用enctype=multipart/form-data 。
所以用
<form action="upload_images_result.jsp" method="post" enctype="multipart/form-data">
<div align="left">
Select a file: <input type="file" name="file" size="50"
enctype="multipart/form-data" placeholder="Upload Your Image" />
</div>
<br>
<div>
<input type="submit" value="Upload File" />
</div>
</form>
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