编写一个显示当前系统日期和时间的servlet？

使用 javac -d . DateServ.java 编译

DateServ.java

package ds;
import javax.servlet.*;
import java.io.*;
import java.util.*;
public class DateServ extends GenericServlet {
    public DateServ() {
        System.out.println("SERVLET LOADED...");
    }
    public void init() {
        System.out.println("I AM FROM init METHOD...");
    }
    public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {
        res.setContentType("text/html");
        PrintWriter pw = res.getWriter();
        Date d = new Date();
        String s = d.toString();
        pw.println("<h1> WELCOME TO SERVLETS <h1>");
        pw.println("<h2> CURRENT DATE & TIME IS : " + s + "<h2>");
    }
    public void destroy() {
        System.out.println("I AM FROM destroy METHOD...");
    }
};

web.xml：

<web-app>
    <servlet>
        <servlet-name>onitroad</servlet-name>
        <servlet-class>ds.DateServ</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>onitroad</servlet-name>
        <url-pattern>/onitroad</url-pattern>
    </servlet-mapping>
</web-app>