how to config the ip of the site?

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hi All:
i want to config the ip of the request, how to do?


for example:
HttpGet httpGet = new HttpGet("https://www.google.com/";);
httpClient.execute(httpGet);


in this way, httpClient will config the google's ip autoly. but i want to 
config the google's ip in my self. 
i want httpclient to visit google in the ip: 2.2.2.2. how to do? 


thanks very much!!