JSP custom taglib lets you perform geocode requests via Yahoo API. This service allows you to find the specific latitude and longitude for an address. For example:
 

and you will get this:

Found: 37.416386 : -122.02486

Attribute result describes a name for page scope variable with geocode data. Type for this variable is com.cj.yahoo.GeocodeBean. This bean supports the following methods:

getPrecision()
getLatitude()
getLongitude()
getAddress()
getCity()
getState()
getZip()
getCountry()

Tags are:

YahooGeocode

Tag performs geocoding request via Yahoo API. Attributes are:

1) appid Describes application ID (you have to request it from Yahoo).
2) url Optional attribute. Defines an URL for Yahoo API. Default value is http://api.local.yahoo.com/MapsService/V1/geocode.
3) street Optional attribute. Defines a street
4) city Optional attribute. Defines a city
5) state Optional attribute. Defines the United States state
6) zip Optional attribute. Defines a zip code

for downloading:

Library: yahoogeocodetag.jar    Description: taglib.tld

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See also Coldtags suite - the largest collection of custom JSP tags.

• Google geocode
• GeoIP taglib