searchengine.java

servlet学习代码

package jsp.servlet.chapter5.status;

import java.io.IOException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class SearchEngine extends HttpServlet {
	public void doGet(HttpServletRequest request, 
			HttpServletResponse response) throws IOException{
		
		String searchStr = request.getParameter("searchStr");
		String searchEngine = request.getParameter("searchEngine");
		
		if(searchStr==null || searchStr.trim().equals("")){
			reportProblem(response, "Missing search string");
			return;
		}
		if(searchEngine==null || searchEngine.trim().equals("")){
			reportProblem(response, "Missing search engine");
			return;
		}
		
		String url = getUrl(searchEngine, searchStr);
		response.sendRedirect(url);
	}
	
	@SuppressWarnings("static-access")
	public void reportProblem(HttpServletResponse response, 
			String problem) throws IOException{
		response.sendError(response.SC_NOT_FOUND, problem);
	}
	
	public String getUrl(String searchEngine, String searchStr){		
		return searchEngine + searchStr;
	}
}