关于连接搜索引擎

这是在tomcat下面的：
出现４０４和５００错误：
＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD><BODY>
<FORM METHOD=POST ACTION="http://127.0.0.1:8080/myweb/search">
<INPUT TYPE="text" NAME="searchString"><br>
<INPUT TYPE="text" NAME="numResults" value=10 size=3><br>
<INPUT TYPE="radio" NAME="searchEngine" value="goole">
<INPUT TYPE="submit" value="search"></FORM></BODY>
</HTML>
＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿
servlet :
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;
public class search 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,"miss searchString");
 return;
}
searchString = URLEncoder.encode(searchString);
String  searchEngine = request.getParameter("searchEngine");
if(searchEngine == null)
{
reportProblem(response,"miss searchEngine");
}
       SearchSpec[] commonSpecs = SearchSpec.getCommonSpecs();
   for(int i = 0;i<commonSpecs.length; i++)
{
   SearchSpec searchSpec = commonSpecs[i];
   if(searchSpec.getName().equals(searchEngine))
{
   String url = searchSpec.makeURL(searchString,"10");
   response.sendRedirect(url);
   return;
   }
   }
   reportProblem(response,"Can't search engine"); } private void reportProblem(HttpServletResponse response,String message)
throws ServletException,IOException
{
         response.sendError(response.SC_NOT_FOUND,"<H2>"+message+"</H2>"); }    public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException
{
doGet(request,response);
}};
//______________________________________________________________________
public class SearchSpec
{
private String name, baseURL,numResultSuffix; private static SearchSpec[] commonSpecs = 
{
new SearchSpec("google","http://www.google.com/search?q=","&num=")
}; public SearchSpec(String name,String baseURL,String numResultSuffix)
{
this.name = name;
this.baseURL = baseURL;
this.numResultSuffix = numResultSuffix;
} public String  makeURL(String searchString,String numResults)
{
       return (baseURL + searchString + numResultSuffix + numResults);
}
public String getName()
{
return name;
} public static SearchSpec[] getCommonSpecs()
{
return(commonSpecs);
}
};