我们在Tomcat安装目录下的webapps文件夹下新建一个ServletLife文件夹,进入该文件夹,写一个index.jsp文件,代码如下: index.jsp <%@ page contentType="text/html;charset=GBK" language="java" %> Show servlet life cycle 这是一段很简单的JSP程序,只为说明问题,整个程序只有一个提交表单的submit。
packagecom.rk.http.b_lifecycle;importjava.io.IOException;importjavax.servlet.ServletConfig;importjavax.servlet.ServletException;importjavax.servlet.ServletRequest;importjavax.servlet.ServletResponse;importjavax.servlet.http.HttpServlet;publicclassLifeDemoextendsHttpServlet{//1、构造方法publicLifeDemo(){System.out...
Chapter 1. Servlet Methods and Life Cycle Terms you'll need to understand: Redirection Servlet life cycle Servlet forwarding and includes Servlet attribute Context parameters Application session GET, POST, … - Selection from Java™ 2 Enterprise Editi
This interface defines methods to initialize a servlet, to service requests, and to remove a servlet from the server. These are known as life-cycle methods and are called in the following sequence: The servlet is constructed, then initialized with theinitmethod. ...
access to shared resources. Shared resources include in-memory data such as instance orclassvariablesand external objects such as files, database connections, and network connections. See the Java Tutorial on Multithreaded Programmingformore information on handling multiple threads in a Java program. ...
HttpServlet init() method and destroy() method are called only once in the servlet life cycle, so we don't need to worry about their synchronization. But service methods such as doGet() or doPost() are getting called in every client request and since servlet uses multithreading, we should...
Now add the below code in the class file.demo5.javapackage forward; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class demo5 extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ...
In this post, I write a little bit about the basic ideas ofweb server,Servlet containerand its relation withJVM. I want to show that Servlet container is nothing more than a Java program. 1. What is a Web Server? To know what is a Servlet container, we need to know what is a Web...
Servlet 2.0 JDK 1.1 Included as part of Java Servlet Development Kit 2.0 Servlet 1.0 June 1997 What is the Java Servlet Life Cycle? There are three methods core to the life cycle of a Java Servlet. They include init(), service(), and the destroy() methods. Each method is required to ...
MyServletDemo.java 在这个 servlet 类中,我们通过使用getParameter()方法获取参数的值,此方法属于ServletRequest接口。在这个例子中,我们将HttpServletRequest作为doGet()方法的参数,HttpServletRequest扩展了ServletRequest接口,这就是为什么getParameter()方法可用于req对象。