jsp源码实例4（搜索引擎）
导读：收集整理的这篇文章主要介绍了jsp源码实例4（搜索引擎），觉得挺不错的，现在分享给大家，也给大家做个参考。 package coreservlets;import java.io.*;i...
收集整理的这篇文章主要介绍了jsp源码实例4（搜索引擎），觉得挺不错的，现在分享给大家，也给大家做个参考。 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; icommonSpecs.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);
}
}
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