📄 simplei18nservlet.java
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/* * Copyright 2004-2005 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. *//* * SimpleI18nServlet.java * */package samples.i18n.simple.servlet;import java.io.*;import java.util.*;import java.text.DateFormat;import java.text.MessageFormat;import javax.servlet.*;import javax.servlet.http.*;/** * This is a simple servlet that demonstrates some of most commonly used i18n features of * the Application Server's Java Servlet API Implementation * @author Chand Basha * @version 1.0 */public class SimpleI18nServlet extends HttpServlet { /** Initializes the servlet. */ public void init(ServletConfig config) throws ServletException { super.init(config); } /** Destroys the servlet. */ public void destroy() { } /** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods. * @param req servlet request * @param res servlet response */ protected void processRequest(HttpServletRequest req, HttpServletResponse res) throws ServletException, java.io.IOException { try { HttpSession session = req.getSession(false); if(session != null) { String sessioncharset = (String)session.getAttribute("charset"); try { req.setCharacterEncoding(sessioncharset); } catch (Exception e) {} } String func = req.getParameter("func"); String action = req.getParameter("action"); if (func!=null){ if(func.equals("sendInput")) { String charsetval = req.getParameter("charsetval"); sendInput (req, res, charsetval, action); } } if ( action.equals("formatDate") ) { formatDate (req, res); } else if ( action.equals("setCharEncoding") ) { setCharEncoding (req, res); } else if ( action.equals("includeServlet") ) { includeServlet (req, res); } else if ( action.equals("forwardServlet") ) { forwardServlet (req, res); } else if ( action.equals("sendErrorMessage") ) { sendErrorMessage (req, res); } else if ( action.equals("useResourceBundle") ) { useResourceBundle (req, res); } else if ( action.equals("forwardJsp") ) { forwardJsp (req, res); } else if ( action.equals("expSetResCharset") ) { expSetResCharset (req, res); } else if ( action.equals("impSetResCharset") ) { impSetResCharset (req, res); } } catch (Exception e) { e.printStackTrace(); } } /** Sets the charset attribute to the session and generates an input form * @param req servlet request * @param res servlet response */ protected void sendInput (HttpServletRequest req, HttpServletResponse res, String charsetval, String action) throws ServletException, IOException { try { HttpSession session = req.getSession(true); session.setAttribute("charset", charsetval); res.setContentType("text/html; charset=" + charsetval); PrintWriter out = res.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>Servlet i18n samples</title></head>"); out.println("<body><br>"); out.println("<P><FONT FACE=\"Times New Roman\"><FONT SIZE=6><B>Servlet i18n samples</B></FONT></FONT></P>"); out.println("<form name=\"i18n-simple\" method=\"post\" action=\"/i18n-simple/SimpleI18nServlet\">"); out.println("<table>"); out.println("<tr>"); out.println("<td><H3>Please enter your name:</H3></td>"); out.println("<td>"); out.println("<input type=\"text\" name=\"name\" size=\"20\">"); out.println("</td>"); out.println("</tr>"); out.println("</table>"); out.println("<pre>"); out.println("<input type=submit value=Submit>"); out.println("</pre>"); out.println("<input type=hidden name=charsetval value=" + charsetval + ">"); out.println("<input type=hidden name=action value=" + action + ">"); out.println("<input type=hidden name=func value=exec>"); out.println("<br>"); out.println("<P><BR><A HREF=\"/i18n-simple\">Back to sample home</A></P>"); out.println("</form>"); out.println("</body>"); out.println("</html>"); out.close(); } catch (Exception e) { e.printStackTrace(); } } /** Gets the locale information from browser settings and sets the locale to * response object using res.setLocale() method. It then retrieves the locale from response * object using res.getLocale() method and formats today's date * @param req servlet request * @param res servlet response */ protected void formatDate (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { try { String name = req.getParameter("name"); String charsetval = req.getParameter("charsetval"); // Get's the locale of the browser from the request object Locale browserLocale = req.getLocale(); // Default locale of the response object Locale resLocale = res.getLocale(); String resCharset = res.getCharacterEncoding(); // Set's the browser's locale to the response object res.setLocale(browserLocale); Locale resLocaleAfter = res.getLocale(); String resCharsetAfter = res.getCharacterEncoding(); res.setContentType("text/html; charset=" + resCharsetAfter); // Output stream for the response java.io.PrintWriter out = res.getWriter(); out.println("<html>"); out.println("<head><title>Formatting date as per browser's locale</title></head>"); out.println("<body>"); out.println("<H4>Welcome " + name + "</H4>"); out.println("Your Browser's preferred locale : " + browserLocale + "<br>"); out.println("Response Locale : " + resLocale + "<br>"); out.println("Response charset : " + resCharset + "<br>"); out.println("Response Locale after setting it from the request locale: " + resLocaleAfter + "<br>"); out.println("Response charset after setting it from request locale: " + resCharsetAfter + "<br>"); // Get today's date and formats it using the browser locale java.util.Date today = new java.util.Date(); DateFormat formatter = DateFormat.getDateInstance(DateFormat.FULL, browserLocale); String formattedDate = formatter.format(today); out.println("Today's date for " + resLocaleAfter + " is : " + formattedDate + "<br>"); out.println("<br>"); out.println("<P><BR><A HREF=\"/i18n-simple\">Back to sample home</A></P>"); out.println("</body></html>"); out.close(); } catch (Exception e) { e.printStackTrace(); } } /** Sets request's character encoding using setCharacterEncoding method of HttpServletRequest interface. * The setCharacterEncoding method is used to inform the servlet container to read request parameters using specified encoding. * @param req servlet request * @param res servlet response */ protected void setCharEncoding (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { try { String name = req.getParameter("name"); String charsetval = req.getParameter("charsetval"); res.setContentType("text/html; charset=" + charsetval); // Output stream for the response PrintWriter out = res.getWriter(); out.println("<html>"); out.println("<head><title>Setting request object's character encoding to " + charsetval + "</title></head>"); out.println("<body>"); out.println("<br><H3> The name entered was : " + name + " and the associated encoding was : " + charsetval + "</H3><br>"); out.println("<br>"); out.println("<P><BR><A HREF=\"/i18n-simple\">Back to sample home</A></P>"); out.println("</body></html>"); out.close(); } catch (Exception e) { e.printStackTrace(); } } /** Includes a servlet using RequestDispatcher's include method. Here the data display behaviour * changes based on the content type set. If the included servlet sets the content type to a different value then the new content type * should be set for the output stream * @param req servlet request * @param res servlet response */ protected void includeServlet (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { try { String name = req.getParameter("name"); String charsetval = req.getParameter("charsetval"); res.setContentType("text/html; charset=" + charsetval); // Output stream for the response PrintWriter out = res.getWriter(); out.println("<html>"); out.println("<head><title>Including another servlet from a servlet</title></head>"); out.println("<body>"); RequestDispatcher dispatcher; dispatcher = getServletContext().getRequestDispatcher("/IncludedServlet"); dispatcher.include(req, res); out.println("<br>Name from the including servlet: " + name + "<br>"); out.println("<br>"); out.println("<P><BR><A HREF=\"/i18n-simple\">Back to sample home</A></P>"); out.println("</body></html>"); out.close(); } catch (Exception e) { e.printStackTrace(); } } /** Forwards a servlet using RequestDispatcher's forward method. Here the data display behaviour * changes based on the content type set. If the forwarded servlet sets the content type to a different value then the new content type * should be set for the output stream * @param req servlet request * @param res servlet response */ protected void forwardServlet (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { try { String name = req.getParameter("name"); String charsetval = req.getParameter("charsetval"); res.setContentType("text/html; charset=" + charsetval);⌨️ 快捷键说明
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