Servlet learning (1)--create a simple Servlet

1. Create a Web project, the business class MyServlet class code is as follows:

package com.yoko;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

/**
 * Familiar with Servlet interface
 * @author Yoko
 */
public class MyServlet implements Servlet{
	
	ServletConfig servletConfig = null;

	/*
	 * This method is a servlet life cycle method used to initialize the servlet and is called once by the web container.
	 */
	public void init(ServletConfig config) throws ServletException {
		this.servletConfig = config;
		System.out.println("Initialize servlet");
		
	}
	
	/*
	 * This method is a servlet life cycle method that provides responses for incoming requests and is called by each request from the web container
	 */
	public void service(ServletRequest request, ServletResponse response)throws ServletException, IOException {
		response.setContentType("text/html");
		response.setCharacterEncoding("UTF-8");
		PrintWriter writer = response.getWriter();
		writer.print("<html><body>");
		writer.print("<div style=\"text-align:center;\"><h2>创建简单Servlet</h2></div>");
		writer.print("</body></html>");
		
	}
	/*
	 * This method is a servlet life cycle method, indicating that the servlet is being destroyed and is only called once
	 */
	public void destroy() {
		System.out.println("销毁Servlet");
		
	}
	/*
	 * This method returns the ServletConfig object
	 */
	public ServletConfig getServletConfig() {
		return servletConfig;
	}

	/*
	 * Returns information about the servlet, such as author name, copyright, version, etc.
	 */
	public String getServletInfo() {
		return "author YOKO";
	}

}

2. The configuration code of the web.xml file in the project is as follows:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>	
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <!-- stands for servlet -->
  <servlet>
  	<!-- Represents the name of the servlet, defined by the user -->
  	<servlet-name>MyServlet</servlet-name>
  	<!-- represents the classpath of the servlet -->
  	<servlet-class>com.yoko.MyServlet</servlet-class>
  </servlet>
  
  <!-- for mapping servlets -->
  <servlet-mapping>
  	<servlet-name>MyServlet</servlet-name>
  	<!-- Client used to call servlet -->
  	<url-pattern>/index.jsp</url-pattern>
  </servlet-mapping>
  
</web-app>

After running successfully, its page is displayed as follows:

Servlet learning (1)--create a simple Servlet

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