JSP 2.0 Expression Language - Implicit Objects
This example illustrates some of the implicit objects available
in the Expression Lanaguage. The following implicit objects are
available (not all illustrated here):
- pageContext - the PageContext object
- pageScope - a Map that maps page-scoped attribute names to
their values
- requestScope - a Map that maps request-scoped attribute names
to their values
- sessionScope - a Map that maps session-scoped attribute names
to their values
- applicationScope - a Map that maps application-scoped attribute
names to their values
- param - a Map that maps parameter names to a single String
parameter value
- paramValues - a Map that maps parameter names to a String[] of
all values for that parameter
- header - a Map that maps header names to a single String
header value
- headerValues - a Map that maps header names to a String[] of
all values for that header
- initParam - a Map that maps context initialization parameter
names to their String parameter value
- cookie - a Map that maps cookie names to a single Cookie object.
Change Parameter
| EL Expression |
Result |
| \${param.foo} |
${param.foo} |
| \${param["foo"]} |
${param["foo"]} |
| \${header["host"]} |
${header["host"]} |
| \${header["accept"]} |
${header["accept"]} |
| \${header["user-agent"]} |
${header["user-agent"]} |