Classes Java Server Pages

1
Classes - Java Server Pages

• We can use standard Java classes and interfaces
• Date, StringTokenizer, BufferedReader,
  Connection, Statement, ResultSet,
• We can also code user-defined classes and use them

2
Classes - Java Server Pages

• Your classes can be located anywhere
• They can be part of a package
• In this case, the first statement in your file
  should be
• package packageName

3
Classes - Java Server Pages

• package packageName
• After compilation, the resulting .class files
  should be placed in the subdirectory (called
  packageName) of the directory pointed to by
  classpath
• For us, that is
• mainwebsite_html/WEB-INF/classes
• ? place .class files in
• mainwebsite_html/WEB-INF/classes/packageName
  directory

4
Classes - Java Server Pages

• To use the class Foo from package myPackage in a
  JSP, use
• lt_at_ page import myPackage.Foo gt
• To use all the classes from package myPackage in
  a JSP, use
• lt_at_ page import myPackage. gt

5
Classes - Java Server Pages

• If your class is NOT part of a package
• After compilation, the resulting .class file
  should be placed in the directory pointed to by
  classpath
• For us, that is
• mainwebsite_html/WEB-INF/classes
• ? place .class files in
• mainwebsite_html/WEB-INF/classes directory

6
Classes - Java Server Pages

• To use the class Foo2 in a JSP, use
• lt_at_ page import Foo gt