XML request and response in java

XML request and response in java

I have to do Company Name Search, i have sample xml request and sample xml
response, can anybody tell me how to code this in java? i tried to parse
xml, that gives complete xml file, i want to enter user defined string as
a value of a tag in xml as a company name and want to display the response
from the server.
Here is namesearch_req.xml :
http://xmlgw.companieshouse.gov.uk/examples/namesearch_req.xml
namesearch_reply :
http://xmlgw.companieshouse.gov.uk/examples/namesearch_reply.xml
Thanks