JSP Learning notes-built-in object application

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1.application usually replaced with This.getservletcontext ()

2.appllication has a very useful function, Getrealpath (), to get an absolute path in order to implement the JSP file operation

String fileName = This.getservletcontext (). Getrealpath ("/") + "Note" + File.separator + name;

3. Save the file with the PrintStream class object

File File = new file (fileName);

if (!file.getparentfile (). exists ()) {
File.getparentfile (). mkdir ();
}

PrintStream PS = null;

PS = new PrintStream (new FileOutputStream (file));

Ps.println (filecontent);
Ps.close ();

3. Scanner class object for reading files

Scanner scan = new Scanner (new FileInputStream (file));

Scan.usedelimiter (";");

StringBuffer buf = new StringBuffer ();

while (Scan.hasnext ()) {

Buf.append (Scan.next ()). Append ("<br>");

}

Scan.close ();

<%=buf%>

4. Get Server Environment Properties

<%
Enumeration ENU = This.getservletcontext (). Getattributenames ();//Get All Properties
while (Enu.hasmoreelements ()) {
String name = (string) enu.nextelement ();
%>
<%
}
%>

JSP Learning notes-built-in object application