When possible load your data into postgis with the correct SRID, you can look
them up on line here: http://epsg.io or http://spatialreference.org
You can teach both postgis, geotools and geoserver about additional codes (in
case your local government has made something up that is not official).
These codes are a key part of data interoperability, uDig was able to read your
PRJ file (no code required) and thus was able to draw in the correct location.
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