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package coreservlets;import java.io.*;import javax.servlet.*;import javax.servlet.http.*;import java.net.*;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<commonSpecs.length; i++) {SearchSpec searchSpec = commonSpecs;if (searchSpec.getName().equals(searchEngine)) {String url =searchSpec.makeURL(searchString, numResults);response.sendRedirect(url);return;}}reportProblem(response, "Unrecognized search engine.");}private void reportProblem(HttpServletResponse response,String message)throws IOException {response.sendError(response.SC_NOT_FOUND,"<H2>" + message + "</H2>");}public void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}} 本文javascriptp源码实例4（搜索引擎）到此结束。岁月，是一首诗，一首蕴含丰富哲理的诗，岁月是一峰骆驼，驮着无数人的梦想。谢谢大家支持！