用servlet编写第一个程序，并在Tomcat上成功运行

编写第一个Servlet程序，即Helloworld程序，并在Tomcat上运行

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; @WebServlet(name = "HelloWorld") public class HelloWorld extends HttpServlet { private String message; public void init() throws ServletException{ message="Hello,First Servlet!"; } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out=response.getWriter(); out.write("<h1>"+message+"</h1>"); } }

运行结果：