Huge Sell on Popular Electronics
SearchEngines.java Servlet that redirects requests to various search engines. Uses the SearchSpec helper class. Accessed by means of SearchEngines.html.
package cwp;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;
/** Servlet that takes a search string, number of results per
* page, and a search engine name, sending the query to
* that search engine. Illustrates manipulating
* the response status line. It sends a 302 response
* (via sendRedirect) if it gets a known search engine,
* and sends a 404 response (via sendError) otherwise.
*
* Taken from Core Web Programming Java 2 Edition
* from Prentice Hall and Sun Microsystems Press,
* .
* May be freely used or adapted.
*/
public class SearchEngines extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
String searchString = request.getParameter("searchString");
if ((searchString == null) ||
(searchString.length() == 0)) {
reportProblem(response, "Missing search string.");
return;
}
// The URLEncoder changes spaces to "+" signs and other
// non-alphanumeric characters to "%XY", where XY is the
// hex value of the ASCII (or ISO Latin-1) character.
// Browsers always URL-encode form values, so the
// getParameter method decodes automatically. But since
// we're just passing this on to another server, we need to
// re-encode it.
searchString = URLEncoder.encode(searchString);
String numResults = request.getParameter("numResults");
if ((numResults == null) ||
(numResults.equals("0")) ||
(numResults.length() == 0)) {
numResults = "10";
}
String searchEngine =
request.getParameter("searchEngine");
if (searchEngine == null) {
reportProblem(response, "Missing search engine name.");
return;
}
SearchSpec[] commonSpecs = SearchSpec.getCommonSpecs();
for(int i=0; i" + message + "");
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
SearchSpec.java
package cwp;
/** Small class that encapsulates how to construct a
* search string for a particular search engine.
*
* Taken from Core Web Programming Java 2 Edition
* from Prentice Hall and Sun Microsystems Press,
* May be freely used or adapted.
*/
public class SearchSpec {
private String name, baseURL, numResultsSuffix;
private static SearchSpec[] commonSpecs =
{ new SearchSpec("google",
"http://www.google.com/search?q=",
"&num="),
new SearchSpec("infoseek",
"http://infoseek.go.com/Titles?qt=",
"&nh="),
new SearchSpec("lycos",
"http://lycospro.lycos.com/cgi-bin/" +
"pursuit?query=",
"&maxhits="),
new SearchSpec("hotbot",
"http://www.hotbot.com/?MT=",
"&DC=")
};
public SearchSpec(String name,
String baseURL,
String numResultsSuffix) {
this.name = name;
this.baseURL = baseURL;
this.numResultsSuffix = numResultsSuffix;
}
public String makeURL(String searchString,
String numResults) {
return(baseURL + searchString +
numResultsSuffix + numResults);
}
public String getName() {
return(name);
}
public static SearchSpec[] getCommonSpecs() {
return(commonSpecs);
}
}
Machine Learning, Big Data, Data Science, Analytics, Cloud, Security, AI, Robotics, Database, BI, Development: Software, Web, Mobile