Java Export Excel,java.io.ioexception:stream is already closed

When using POI for Excel export, the background reports an error like this:

Java.io.IOException:Stream is already closed

The exported code is as follows:

After a long day, only to find the problem in the No. 409 line

Out.close ();

Out of this output stream is not manually shut down, the system will automatically shut down for us, and manually shut down the words will also cause problems.

In fact, only the input/output stream created with the new keyword will need to be shut down manually, as in the following

New FileInputStream ( new file ("" New FileOutputStream ( ")");

Java Export Excel,java.io.ioexception:stream is already closed