确定InputStream的大小(Determine the size of an InputStream)

 我目前的情况是：我必须读取一个文件并将内容放入InputStream 。 之后，我需要将InputStream的内容放入一个字节数组中，这样就需要（据我所知） InputStream的大小。 有任何想法吗？ 
 
 根据要求，我将显示从上传的文件创建的输入流 
 
InputStream uploadedStream = null;
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
java.util.List items = upload.parseRequest(request);      
java.util.Iterator iter = items.iterator();

while (iter.hasNext()) {
    FileItem item = (FileItem) iter.next();
    if (!item.isFormField()) {
        uploadedStream = item.getInputStream();
        //CHANGE uploadedStreambyte = item.get()
    }
}
 
 该请求是一个HttpServletRequest对象，它类似于FileItemFactory ， ServletFileUpload来自Apache Commons FileUpload包。 

My current situation is: I have to read a file and put the contents into InputStream. Afterwards I need to place the contents of the InputStream into a byte array which requires (as far as I know) the size of the InputStream. Any ideas?
 
As requested, I will show the input stream that I am creating from an uploaded file
 
InputStream uploadedStream = null;
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
java.util.List items = upload.parseRequest(request);      
java.util.Iterator iter = items.iterator();

while (iter.hasNext()) {
    FileItem item = (FileItem) iter.next();
    if (!item.isFormField()) {
        uploadedStream = item.getInputStream();
        //CHANGE uploadedStreambyte = item.get()
    }
}
 
The request is a HttpServletRequest object, which is like the FileItemFactory and ServletFileUpload is from the Apache Commons FileUpload package.

原文：https://stackoverflow.com/questions/1119332