用 commons-email 开发 代附件的邮件 的问题

servlet 代码如下
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import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.mail.EmailAttachment;
import org.apache.commons.mail.EmailException;
import org.apache.commons.mail.MultiPartEmail;public class sendattMail extends HttpServlet { private static final long serialVersionUID = -1408700020471642036L;
private ServletContext sc;
private String savePath;
private Map<String, String> parameters = new HashMap<String, String>(); public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
File file = this.doAttachment(request); MultiPartEmail email = new MultiPartEmail();
email.setCharset("UTF-8");
email.setHostName("smtp.sina.com");
email.setAuthentication("maksim420", "xxxxxxx"); try {
email.addTo(parameters.get("to"));
email.setFrom(parameters.get("from"));
email.setSubject(parameters.get("title"));
email.setMsg(parameters.get("content"));
if (file != null) {
EmailAttachment attachment = new EmailAttachment();
attachment.setPath(file.getPath());
attachment.setDisposition(EmailAttachment.ATTACHMENT);
attachment.setName(file.getName());
email.attach(attachment);
}
System.out.println(parameters.get("content"));
email.send();
request.setAttribute("sendmail.message", "邮件发送成功！");
} catch (EmailException e) {
e.printStackTrace();
request.setAttribute("sendmail.message", "邮件发送不成功！");
} request.getRequestDispatcher("/sendresult.jsp").forward(request,
response); } public File doAttachment(HttpServletRequest request)
throws ServletException, IOException {
File file = null;
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory); try {
List items = upload.parseRequest(request);
Iterator it = items.iterator();
while (it.hasNext()) {
FileItem item = (FileItem) it.next();
if (item.isFormField()) {
parameters.put(item.getFieldName(), item.getString("UTF-8"));
} else {
if (item.getName() != null && !item.getName().equals("")) {
File tempFile = new File(item.getName());
file = new File(sc.getRealPath("/") + savePath,
tempFile.getName());
item.write(file); }
}
}
} catch (Exception e) {
e.printStackTrace();
request.setAttribute("upload.message", "上传文件不成功！");
}
return file;
} public void init(ServletConfig config) {
savePath = config.getInitParameter("savePath");
sc = config.getServletContext();
}}为什么  发送后 显示 发送成功  但是受到的 邮件 里 没有附件  而且  邮件的 内容为空～～～？
应用目录下的 上传文件夹中 能够出现  所带的 附件～～～