Prentice Hall and Sun Microsystems. Personal use only; do not redistribute.
6.3 A Front End to Various Search Engines
137
Listing 6.1 SearchEngines.java 
package coreservlets;
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.
 */
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");
Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.
Servlet and JSP training courses by book's author: courses.coreservlets.com.






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