【发布时间】：2013-11-01 19:57:40
【问题描述】：
我在strtus-2.3.15.3 中使用了file-upload（通用文件上传）。
我的.jsp 中有一个表单，其中包含多个字段，其中包含许多差异类型（文本字段、文本区域、隐藏、文件），包括 FILE 和明显的 SUBMIT。
当我通过选择一个文件提交表单并在所有其他字段中输入一些文本时，它会在提及临时文件夹中生成 .tmp 文件。将我的文件上传到 myfolder 后，只有与文件字段相关的 .tmp 文件将被删除，但其余的 .tmp（大小为 1kb）文件仍保留为 .
List items = upload.parseRequest(servletRequest);
下面代码中的这一行为所有具有某些值的字段生成.tmp 文件（如果您没有在它未生成的文本字段中输入任何文本）。
MonitoredMultiPartRequest.java:
public void parse(HttpServletRequest servletRequest, String saveDir)
throws IOException
{
System.setProperty("java.io.tmpdir", "D:\\ankit");
UploadListener listener = new UploadListener(servletRequest);
// Create a factory for disk-based file items
FileItemFactory factory = new MonitoredDiskFileItemFactory(listener);
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
}
MonitoredDiskFileItemFactory：
public class MonitoredDiskFileItemFactory extends DiskFileItemFactory
{
HttpServletRequest request;
public MonitoredDiskFileItemFactory(OutputStreamListener listener, HttpServletRequest request)
{
this.listener = null;
this.listener = listener;
this.request = request;
setTrackers();
}
public void setTrackers()
{
FileCleaningTracker fileCleaningTracker = FileCleanerCleanup.getFileCleaningTracker(request.getServletContext());
File repository = new File(System.getProperty("java.io.tmpdir"));
DiskFileItemFactory factory = new DiskFileItemFactory(DiskFileItemFactory.DEFAULT_SIZE_THRESHOLD, repository);
factory.setFileCleaningTracker(fileCleaningTracker);
super.setFileCleaningTracker(fileCleaningTracker);
super.setRepository(repository);
}
public MonitoredDiskFileItemFactory(int sizeThreshold, File repository, OutputStreamListener listener)
{
super(sizeThreshold, repository);
this.listener = null;
this.listener = listener;
}
public FileItem createItem(String fieldName, String contentType, boolean isFormField, String fileName)
{
MonitoredDiskFileItem result = new MonitoredDiskFileItem(fieldName, contentType, isFormField, fileName, getSizeThreshold(), getRepository(), listener);
FileCleaningTracker tracker = getFileCleaningTracker();
if (tracker != null)
{
tracker.track(result.getTempFileOfDistFileItem(), result);
}
return result;
}
private OutputStreamListener listener;
}
MonitoredDiskFileItem：
public class MonitoredDiskFileItem extends DiskFileItem
{
public MonitoredDiskFileItem(String fieldName, String contentType, boolean isFormField, String fileName, int sizeThreshold, File repository, OutputStreamListener listener)
{
super(fieldName, contentType, isFormField, fileName, sizeThreshold, repository);
mos = null;
this.listener = listener;
}
public OutputStream getOutputStream()
throws IOException
{
if (mos == null)
mos = new MonitoredOutputStream(super.getOutputStream(), listener);
return mos;
}
public File getTempFileOfDistFileItem()
{
return super.getTempFile();
}
private MonitoredOutputStream mos;
private OutputStreamListener listener;
}
UploadListener：
public class UploadListener implements OutputStreamListener, Serializable
{
private static final long serialVersionUID = 1L;
private int totalToRead = 0;
private int totalBytesRead = 0;
private int percentDone = 0;
private int previou_percentDone = 0;
private long uploadspeed = 0;
private long starttime;
private long stTime, EndTime;
HttpSession session;
private int count = 0;
public UploadListener(HttpServletRequest request)
{
totalToRead = request.getContentLength();
session = request.getSession();
}
public void start()
{
session.setAttribute("percentageDone", 0);
session.setAttribute("speed", 0);
starttime = System.currentTimeMillis();
stTime = starttime;
}
public String getMessage()
{
return "" + totalBytesRead + " bytes have been read (" + percentDone + "% done) ";
}
public void bytesRead(int bytesRead)
{
totalBytesRead = totalBytesRead + bytesRead;
if (100.00 * totalBytesRead > totalToRead)
{
previou_percentDone = percentDone;
percentDone = (int) Math.round(100.00 * totalBytesRead / totalToRead);
if (previou_percentDone < percentDone)
{
long speed = 0;
try
{
double TimediffInSecond = (System.currentTimeMillis() - starttime) / 1000;
if (TimediffInSecond > 0)
speed = Math.round(((totalBytesRead) / TimediffInSecond) / 1048576);
else
speed = totalBytesRead / 1048576;
}
catch (Exception e)
{
System.err.println(e.getMessage());
}
}
}
}
public void done()
{
EndTime = System.currentTimeMillis();
session.setAttribute("percentageDone", 100);
session.setAttribute("speed", 100);
}
@Override
public void error(String message)
{
// System.out.println(message);
}
public long getUploadspeed()
{
return uploadspeed;
}
public void setUploadspeed(long uploadspeed)
{
this.uploadspeed = uploadspeed;
}
}
EDIT:
1> 为什么会为字段 (textarea ,hidden,textfield) 生成此 .tmp 文件。
我们怎样才能防止这种情况发生？
2> 我想停止为所有字段生成.tmp 文件，除了type='file'（文件字段）。
3> 否则，我如何删除所有.tmp 文件？
【问题讨论】：
标签： java tomcat file-upload struts2 temporary-files