📄 searchenginesfrontend.java
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package eg.cha9;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import util.ServletUtilities;
/**
*
* @author Bily
*
* 单纯的一个HttpServletRequest对象或者HttpServletResponse、HttpSession对象都是没有意义的
* 我们要的，是服务器与客户端交互后产生的http对象，
* 一般，这些对象，都是从内置request中获取
*
* request.getCookies();
*/
public class SearchEnginesFrontEnd extends HttpServlet {
private static final long serialVersionUID = 1L;
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");
//send to browser
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=\"/eg-servlet/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) {
if (name1.equals(name2))
return (" CHECKED");
else
return ("");
}
}
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