Javaweb Basic Inheritance Genericservlet Simple example

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Javaee:7
javase:1.8
jstl:1.2.2
Server:tomcat 8.5
Explorer:firefox
Os:windows7 x64
Ide:myeclipse

Xml

<?xml version= "1.0" encoding= "UTF-8"? ><web-app xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" xmlns= "Http://xmlns.jcp.org/xml/ns/javaee" xsi:schemalocation= "Http://xmlns.jcp.org/xml/ns/javaee/http Xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd "id=" webapp_id "version=" 3.1 "><servlet><servlet-name> mygenericservlet</servlet-name><servlet-class>jizuiku.web.servlet.mygenericservlet</ servlet-class><!--perform this class of--><init-param><param-name>minnum</param-name>< param-value>10</param-value></init-param><init-param><param-name>maxnum</ Param-name><param-value>100</param-value></init-param></servlet><servlet-mapping ><servlet-name>myGenericServlet</servlet-name> <!--two name corresponding to the good--><url-pattern>/ mygenericservletdemo</url-pattern><!--Access is this path--></servlet-mapping></web-app>

Code that inherits the class of Genericservlet

Package Jizuiku.web.servlet;import Java.io.ioexception;import Javax.servlet.genericservlet;import Javax.servlet.servletexception;import Javax.servlet.servletrequest;import javax.servlet.servletresponse;/** *  *  * @author to the bitter * @version V17.10.20 */public class Mygenericservlet extends genericservlet{/** *  */private S Tatic final Long serialversionuid = 1L; @Overridepublic void Service (ServletRequest servletrequest, Servletresponse Servletresponse) throws Servletexception, IOException {System.out.println ("perform service () ..."); According to the source code can be introduced, the method to be rewritten must be init () @Overridepublic void Init () throws Servletexception {//TODO auto-generated method Stubsyste M.out.println ("Hello, execute Initialization program");} @Overridepublic void Destroy () {//TODO auto-generated method StubSystem.out.println ("Execute Destroy () ...");}}

Effect

When the browser accesses the specified page once, the console output information changes as follows

Extended
Why would you want to override the parameterless init () method? Please look at the source code

    /**     * Called by the servlet container to indicate to a servlet, the servlet     * is being placed into service. See {@link servlet#init}.     * <p>     * This implementation stores the {@link ServletConfig} object it receives     * from the servlet container For later use. When overriding this form     of * The method, call <code>super.init (config) </code>.     *     * @param config     * The            <code>ServletConfig</code> object that contains     *            Configuration information for this servlet     * @exception servletexception     *                If a exception occurs that int Errupts the servlet s     *                normal operation     * @see unavailableexception    */@Override public void init (ServletConfig config) throws servletexception {        this.config = config;        This.init ();    }

A brief introduction to Serialversionuid

website: http://www.cnblogs.com/btdxqz/p/6806372.html

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Javaweb Basic Inheritance Genericservlet Simple example