searchenginesfrontend.java

来自「j2EE」· Java 代码 · 共 113 行

JAVA
113 行
字号 
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/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("");
  }
}

class ServletUtilities {
  public static final String DOCTYPE =
    "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">";

  public static String headWithTitle(String title) {
    return(DOCTYPE + "\n" +
           "<HTML>\n" +
           "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n");
  }


  public static int getIntParameter(HttpServletRequest request,
                                    String paramName,
                                    int defaultValue) {
    String paramString = request.getParameter(paramName);
    int paramValue;
    try {
      paramValue = Integer.parseInt(paramString);
    } catch(NumberFormatException nfe) { // Handles null and bad format
      paramValue = defaultValue;
    }
    return(paramValue);
  }

  public static String getCookieValue(Cookie[] cookies, String cookieName,String defaultValue) {
    try{
    for(int i=0; i<cookies.length; i++) {
      Cookie cookie = cookies[i];
      if (cookieName.equals(cookie.getName()))
        return(cookie.getValue());
    }
}
    catch(Exception e){}
    return(defaultValue);
  }

  // Approximate values are fine.

  public static final int SECONDS_PER_MONTH = 60*60*24*30;
  public static final int SECONDS_PER_YEAR = 60*60*24*365;
}

searchenginesfrontend.java - 源码说明

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