案例需求：編寫Servlet，當瀏覽器發送systemTime.do請求時，返回yyyy-MM-dd hh:mm:ss格式的日期字符串並在瀏覽器中顯示。

案例實現：

● Servlet對應的Java類源代碼：

package com.xdl.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.text.SimpleDateFormat;

import java.util.Date;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class XdlSystemTime extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest req,

HttpServletResponse resp) throws ServletException, IOException {

// 獲取系統當前時間 yyyy-MM-dd hh:mm:ss

Date date = new Date();

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

String dateStr = sdf.format(date);

//寫給瀏覽器

PrintWriter pw = resp.getWriter();

pw.write("<h1>" + dateStr + "</h1>");

pw.close();

}

}

● web.xml配置

<servlet>

<servlet-name>XdlSystemTime</servlet-name>

<servlet-class>com.xdl.servlet.XdlSystemTime</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>XdlSystemTime</servlet-name>

<url-pattern>/systemTime.do</url-pattern>

</servlet-mapping>

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