根据地区和时区获取当地时间
本例创建一个处理GET请求和POST请求的servlet
servlet TimeForm中的GET方法显示一个窗体：
Submit后的结果：
源代码：
1 import javax.servlet.*; 2 import javax.servlet.http.*; 3 import java.io.*; 4 import java.text.DateFormat; 5 import java.util.*; 6 public class TimeForm extends HttpServlet{ 7 private static final String CONTENT_TYPE="text/html;charset=GBK"; 8 private Locale[] allLocale=Locale.getAvailableLocales(); 9 private String[] allTimeZone=TimeZone.getAvailableIDs(); 10 11 public void doGet(HttpServletRequest request,HttpServletResponse response) 12 throws ServletException,IOException{ 13 //解决显示中文的问题 14 response.setContentType(CONTENT_TYPE); 15 request.setCharacterEncoding("GBK"); 16 PrintWriter out=response.getWriter(); 17 out.println("<h3>Choose locale and time zone</h3>"); 18 out.println("<form method=\"post\" action="+"/LEARN/TimeForm>"); 19 out.println("Locale <select size=\"1\" name=\"locale\">"); 20 for(int i=0;i<allLocale.length;++i){ 21 out.println("<option value=\""+i+"\">"+ 22 allLocale[i].getDisplayName()+"</option>"); 23 } 24 out.println("</select>"); 25 26 out.println("<p>Time Zone<select size=\"1\" name=\"timezone\""); 27 for(int i=0;i<allTimeZone.length;++i){ 28 out.println("<option value=\""+allTimeZone[i]+"\">"+allTimeZone[i] 29 +"</option>"); 30 } 31 out.println("</select"); 32 33 out.println("<p><input type=\"submit\" value=\"Submit\">"); 34 out.println("<input type=\"reset\" value=\"Reset\"></p>"); 35 out.println("</Form>"); 36 out.close(); 37 } 38 39 public void doPost(HttpServletRequest request,HttpServletResponse response) 40 throws ServletException,IOException{ 41 response.setContentType(CONTENT_TYPE); 42 //response.setContentType( "text/html;charset=GBK "); 43 request.setCharacterEncoding("GBK"); 44 PrintWriter out=response.getWriter(); 45 int localeIndex=Integer.parseInt(request.getParameter("locale")); 46 String timeZoneID = request.getParameter("timezone"); 47 out.println("<html>"); 48 out.println("<head><title>Current Time</title></head>"); 49 out.println("<body>"); 50 Calendar calendar=new GregorianCalendar(allLocale[localeIndex]); 51 52 //TimeZone 表示时区偏移量，也可以计算夏令时。 53 TimeZone timezone=TimeZone.getTimeZone(timeZoneID); 54 // 获取日期/时间格式器，该格式器具有给定语言环境的给定格式化风格。 55 DateFormat dateFormat=DateFormat.getDateTimeInstance(DateFormat.FULL 56 , DateFormat.FULL, allLocale[localeIndex]); 57 dateFormat.setTimeZone(timezone); 58 out.println("Current time is "+dateFormat.format(calendar.getTime())+"</p>"); 59 out.println("</body></html>"); 60 out.close(); 61 } 62 }
