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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); } } 返回类别: 教程 上一教程: 三步学会JAVA SOCKET编程 下一教程: DOM文档操作和XML文件互换JAVA实现 您可以阅读与"JSP源码实例4(搜索引擎)"相关的教程: · jsp源码实例4（搜索引擎） · JSP源码实例3(获取JSP各种参数) · JSP源码实例1(输出) · jsp源码实例1（输出） · jsp源码实例2（获取表单参数） |
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