9、处理Cookie

＼n" +
"＜INPUT TYPE=＼"RADIO＼" NAME=＼"searchEngine＼"＼n" +
" VALUE=＼"hotbot＼"" +
checked("hotbot", searchEngine) + "＞＼n" +
"HotBot＼n" +
"＜BR＞＼n" +
"＜INPUT TYPE=＼"SUBMIT＼" VALUE=＼"Search＼"＞＼n" +
"＜/CENTER＞＼n" +
"＜/FORM＞＼n" +
"＼n" +
"＜/BODY＞＼n" +
"＜/HTML＞＼n");
}

private String checked(String name1, String name2) {
if (name1.equals(name2))
return(" CHECKED");
else
return("");
}
}

　　 CustomizedSearchEngines.java

　　 前面的SearchEnginesFrontEnd Servlet把数据发送到CustomizedSearchEngines Servlet。本例在许多方面与前面介绍HTTP状态代码时的例子相似，区别在于，本例除了要构造一个针对搜索引擎的URL并向用户发送一个重定向应答之外，还要发送保存用户数据的Cookies。
package hall;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;

public class CustomizedSearchEngines extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {

String searchString = request.getParameter("searchString");
Cookie searchStringCookie =
new LongLivedCookie("searchString", searchString);
response.addCookie(searchStringCookie);
searchString = URLEncoder.encode(searchString);
String numResults = request.getParameter("numResults");
Cookie numResultsCookie =
new LongLivedCookie("numResults", numResults);
response.addCookie(numResultsCookie);
String searchEngine = request.getParameter("searchEngine");
Cookie searchEngineCookie =
new LongLivedCookie("searchEngine", searchEngine);
response.addCookie(searchEngineCookie);
SearchSpec[] commonSpecs = SearchSpec.getCommonSpecs();
for(int i=0; i＜commonSpecs.length; i++) {
SearchSpec searchSpec = commonSpecs[i];
if (searchSpec.getName().equals(searchEngine)) {
String url =
searchSpec.makeURL(searchString, numResults);
response.sendRedirect(url);
return;
}
}
response.sendError(response.SC_NOT_FOUND,
"No recognized search engine specified.");
}

public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}

……