Java. io. IOException: Stream closed exception

When uploading images using jsp, you can directly change the java code to jsp. The following exception occurs during the upload:
2012-12-31 8:59:21 org. apache. catalina. core. StandardWrapperValve invoke
Severe: Servlet. service () for servlet jsp threw exception
Java. io. IOException: Stream closed
...
Think twice about the code after turning jsp into servlet. As follows (very eye-catching ): Copy codeThe Code is as follows :...
} Catch (Exception e ){
E. printStackTrace ();
} Finally {
Out. flush ();//
Out. close (); // the source code is used here.
DBHelper. freeConnection (connection );
}
Out. write ('\ R'); // as above, I have disabled the out object, but it is still in use, so an exception is generated as described at the beginning.
Out. write ('\ n ');
} Catch (Throwable t ){
If (! (T instanceof SkipPageException )){
Out = _ jspx_out;
If (out! = Null & out. getBufferSize ()! = 0)
Try {out. clearBuffer ();} catch (java. io. IOException e ){}
If (_ jspx_page_context! = Null) _ jspx_page_context.handlePageException (t );
}
} Finally {
_ JspxFactory. releasePageContext (_ jspx_page_context );
}
...

Solution: change the code in red and bold in the program:Copy codeThe Code is as follows: out. flush ();
Out = pageContext. pushBody (); // the description of this program is clearly stated in the doc.

(Note the differences between the flush () and clear () methods, because different programs are required)

abstract void

flush() Flush the stream.

abstract void

clear() Clear the contents of the buffer.

PageContext implements the abstract class JspContext by pushBody () to save the current out object.

BodyContent

pushBody() Return a new BodyContent object, save the current "out" JspWriter, and update the value of the "out" attribute in the page scope attribute namespace of the PageContext.

Public abstract class BodyContent
Extends JspWriter

Out built-in object