searchengines.java

servlet的示例代码

package eg.cha7;

import java.io.IOException;
import java.net.URLEncoder;

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

/**
 * 
 * @author Bily
 * response.sendRedirect(strUrl);//跳转到字符串strUrl所表示的url中
 */
public class SearchEngines extends HttpServlet {
	private static final long serialVersionUID = 1L;

	@SuppressWarnings({ "deprecation", "static-access" })
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// getParameter自动解码URL编码的查询字符串。由于我们
		// 要把查询字符串发送给另一个服务器，因此再次使用
		// URLEncoder进行URL编码
		String searchString = URLEncoder.encode(request.getParameter("searchString"));
		String numResults = request.getParameter("numResults");
		String searchEngine = request.getParameter("searchEngine");
		SearchSpec[] commonSpecs = SearchSpec.getCommonSpecs();
		for (int i = 0; i < commonSpecs.length; i++) {
			SearchSpec searchSpec = commonSpecs[i];
			if (searchSpec.getName().equals(searchEngine)) {
				String url = response.encodeURL(searchSpec.makeURL(searchString, numResults));
				response.sendRedirect(url);
				return;
			}
		}
		response.sendError(response.SC_NOT_FOUND, "No recognized search engine specified.");
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}
}