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Cookie[] cookies = request.getCookies();
 if(cookies!=null){
    for(Cookie cookie : cookies){
   if(cookie.getName().equals("mid")){
    String mid = cookie.getValue();
   }
  }
 }
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String mid = java.net.InetAddress.getLocalHost().getHostName();
  Cookie c = new Cookie("mid",mid);
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c.setMaxAge(60*3);
//ÉèÖÃcookie´æ·ÅµÄpath,ÉèÖÃÁË´Ëpath,ÇëÇóµÄurl°üº¬´Ëpath(µ±È»ÓòÃûҲҪƥÅä)¶¼¿ÉÒԵõ½´Ëcookie.·ñÔò²»Äܵõ½.
  c.setPath("/");
//ÉèÖÃcookie´æÈëµÄÓòÃû,Èç¹ûÉèÖÃΪ.test.com»òtest.com,ÔòÒÔ´ËÓòÃû½áβµÄurlÇëÇóʱ¶¼¿ÉµÃµ½´Ëcookie(µ±È»pathҲҪƥÅä),·ñÔò²»Äܵõ½.Èç¹û²»ÉèÖÃÓòÃû,ÒÔµ±Ç°ÇëÇóµÄÓòÃûΪ׼.
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  c.setDomain("www.test.com");
  response.addCookie(c);
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import java.net.Socket;
import java.util.Vector;
/**
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*/
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