示例：Servlet显示当前系统时间（时间格式化）

 package com.mhb;

 import java.io.IOException;
 import java.io.PrintWriter;
 import java.text.SimpleDateFormat;
 import java.util.*;

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

 public class TimeServlet extends HttpServlet {

 public void init() throws ServletException {
 }

 public void doGet(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
21 response.setContentType("text/html;charset=utf-8");
22 PrintWriter out = response.getWriter();
23 Date nowDate = new Date(System.currentTimeMillis());
24 SimpleDateFormat time = new SimpleDateFormat("yyyy年MM月dd日-HH时mm分ss秒");
25 out.print("当前系统时间为："+ time.format(nowDate));
 }

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

 public void destroy() {
 super.destroy();
 }
 }

浏览器显示：