import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;

@WebServlet("/HelloWorld")
public class HelloWorld extends HttpServlet {
 SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

 @Override
 public void init() throws ServletException {
 }

 @Override
 protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
 //设置响应内容类型
 resp.setContentType("text/html");

 //设置逻辑实现
 PrintWriter out = resp.getWriter();
 String message = "Hello world, this message is from servlet! " + f.format(System.currentTimeMillis());
 out.println("<h3>" + message + "</h3>");
 }

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