处理Cookie
了前面已经说明的LongLiveCookie类，我们用它来创建作废期限很长的Cookie。
package hall;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;
public class SearchEnginesFrontEnd extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
Cookie cookies = request.getCookies();
String searchString =
ServletUtilities.getCookieValue(cookies,
"searchString",
"Java Programming");
String numResults =
ServletUtilities.getCookieValue(cookies,
"numResults",
"10");
String searchEngine =
ServletUtilities.getCookieValue(cookies,
"searchEngine",
"google");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Searching the Web";
out.println(ServletUtilities.headWithTitle(title) +
"<BODY BGCOLOR=＼"#FDF5E6＼">＼n" +
"<H1 ALIGN=＼"CENTER＼">Searching the Web</H1>＼n" +
"＼n" +
"<FORM ACTION=＼"/servlet/hall.CustomizedSearchEngines＼">＼n" +
"<CENTER>＼n" +
"Search String:＼n" +
"<INPUT TYPE=＼"TEXT＼" NAME=＼"searchString＼"＼n" +
" VALUE=＼"" + searchString + "＼"><BR>＼n" +
"Results to Show Per Page:＼n" +
"<INPUT TYPE=＼"TEXT＼" NAME=＼"numResults＼"＼n" +
" VALUE=" + numResults + " SIZE=3><BR>＼n" +
"<INPUT TYPE=＼"RADIO＼" NAME=＼"searchEngine＼"＼n" +
" VALUE=＼"google＼"" +
checked("google", searchEngine) + ">＼n" +
"Google |＼n" +
"<INPUT TYPE=＼"RADIO＼" NAME=＼"searchEngine＼"＼n" +
" VALUE=＼"infoseek＼"" +
checked("infoseek", searchEngine) + ">＼n" +
"Infoseek |＼n" +
"<INPUT TYPE=＼"RADIO＼" NAME=＼"searchEngine＼"＼n" +
" VALUE=＼"lycos＼"" +
checked("lycos", searchEngine) + ">＼n" +
"Lycos |＼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) {
package hall;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;
public class SearchEnginesFrontEnd extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
Cookie cookies = request.getCookies();
String searchString =
ServletUtilities.getCookieValue(cookies,
"searchString",
"Java Programming");
String numResults =
ServletUtilities.getCookieValue(cookies,
"numResults",
"10");
String searchEngine =
ServletUtilities.getCookieValue(cookies,
"searchEngine",
"google");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Searching the Web";
out.println(ServletUtilities.headWithTitle(title) +
"<BODY BGCOLOR=＼"#FDF5E6＼">＼n" +
"<H1 ALIGN=＼"CENTER＼">Searching the Web</H1>＼n" +
"＼n" +
"<FORM ACTION=＼"/servlet/hall.CustomizedSearchEngines＼">＼n" +
"<CENTER>＼n" +
"Search String:＼n" +
"<INPUT TYPE=＼"TEXT＼" NAME=＼"searchString＼"＼n" +
" VALUE=＼"" + searchString + "＼"><BR>＼n" +
"Results to Show Per Page:＼n" +
"<INPUT TYPE=＼"TEXT＼" NAME=＼"numResults＼"＼n" +
" VALUE=" + numResults + " SIZE=3><BR>＼n" +
"<INPUT TYPE=＼"RADIO＼" NAME=＼"searchEngine＼"＼n" +
" VALUE=＼"google＼"" +
checked("google", searchEngine) + ">＼n" +
"Google |＼n" +
"<INPUT TYPE=＼"RADIO＼" NAME=＼"searchEngine＼"＼n" +
" VALUE=＼"infoseek＼"" +
checked("infoseek", searchEngine) + ">＼n" +
"Infoseek |＼n" +
"<INPUT TYPE=＼"RADIO＼" NAME=＼"searchEngine＼"＼n" +
" VALUE=＼"lycos＼"" +
checked("lycos", searchEngine) + ">＼n" +
"Lycos |＼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) {