我上传文件，把流都关闭了，然后还是删除不了，我贴下代码，高手看看是什么问题：if(ServletFileUpload.isMultipartContent(request)){DiskFileItemFactoryfactory=newDiskFileItemFa...

我上传文件，把流都关闭了，然后还是删除不了，我贴下代码，高手看看是什么问题：

if (ServletFileUpload.isMultipartContent(request)) {

DiskFileItemFactory factory = new DiskFileItemFactory();

factory.setRepository(file1);

factory.setSizeThreshold(1024000);

ServletFileUpload sfu = new ServletFileUpload(factory);

sfu.setSizeMax(Long.parseLong(filesize));

List items = null;

items = sfu.parseRequest(request);

Iterator it = items == null ? null : items.iterator();

while (it != null && it.hasNext()) {

FileItem item = (FileItem) it.next();

if (!item.isFormField()) {

int num = 0;

String filename = item.getName().substring(

item.getName().lastIndexOf("\\") + 1);

String tempext = filename.substring(filename

.lastIndexOf(".") + 1);

for (int i = 0; i < fileext.length; i++) {

if (fileext[i].equals(tempext)) {

num = 1;

}

}

if (num == 1) {

BufferedInputStream in = new BufferedInputStream(item.getInputStream());

String newFilename = filename;

if (os.equals("linux")) {

newFilename = new String(filename.getBytes(),"UTF-8");

}

File file = new File(path + file.separator+ newFilename);

if (!file.exists()) {

FileOutputStream fos = new FileOutputStream(file);

BufferedOutputStream out = new BufferedOutputStream(fos);

Streams.copy(in, out, true);result = "上传成功";

fos.close();

out.close();

} else {

result = "文件已存在";

}

in.close();

} else {

result = "不允许的文件类型";

}

}

}

}

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