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<form method='POST' enctype='multipart/form-data' action='UploadServlet'>
<input name="file1" type="file" />
<input name="upload" type="submit" value="上传" />
</form>
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
InputStream is = request.getInputStream();
OutputStream os = new FileOutputStream(new File("e:/sample.txt"));
byte[] b = new byte[request.getContentLength()];
is.read(b);
os.write(b);
os.close();
PrintWriter out = response.getWriter();
out.print("file uploading finished。");
}
<form method='POST' enctype='multipart/form-data' action='YourServlet'>