Deployment

• Ant
• Ant is the Java version of the make utility that is commonly used to build programs written in C or C++.
• A programmer writes ANT build scripts to perform repetitive tasks such as compiling and packaging compiled code into Archives.
• Deployment Descriptor
• Every Java application has a deployment descriptor that is located at WEB-INF/web.xml, relative to the root of the deployment folder.
• So if the deployable objects are stored in folder "webapp", our deployment descriptor is located at webapp/WEB-INF/web.xml
• The web.xml file configures information such as servlets and url-patterns that lead to their invocation.
• To Deploy an application on web server we create a Directory Structure as follows.
• Create a Project Directory Let us call it as demojdbc
• All our Html and other view files rest in this directory
• In the Project Directory we create a folder called as WEB-INF.
• In WEB-INF we create a folder called as classes
• In classes we copy the compiled classes
• We will also create a file "web.xml" inside WEB-INF which will take care of our server mappings.
• The basic structure of a "web.xml" file is as follows.

•  <?xml version="1.0" encoding="UTF-8"?>  
   <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">  
    <display-name>demojdbc</display-name>  
    <servlet>  
        <servlet-name>formservlet</servlet-name>  
        <servlet-class>formservlet</servlet-class>  
    </servlet>  
    <servlet-mapping>  
        <servlet-name>formservlet</servlet-name>  
        <url-pattern>/formservlet</url-pattern>  
    </servlet-mapping>  
    <servlet>  
        <servlet-name>reportservlet</servlet-name>  
        <servlet-class>reportservlet</servlet-class>  
    </servlet>  
    <servlet-mapping>  
        <servlet-name>reportservlet</servlet-name>  
        <url-pattern>/reportservlet</url-pattern>  
    </servlet-mapping>  
   </web-app>  
  

• Next we need to create a WAR file of this directory structure.
• To create a war file make sure your Java path is set in System Path.
• Next go to your project directory using command prompt/terminal and use the following command
• jar -cvf demojdbc.war *
• Copy the mysql connector jar file in Apache Tomcat lib folder.
• In system classpath add mysql connector jar file as well as servlet-api.jar file.
• servlet-api.jar file is also found in same location.
• During execution tomcat looks for these files for servlet as well as mysql classes.
• By defining class path the system already knows path to these classes and provides them to Tomcat.
• Open apache server page in browser
• generally this is localhost:8080
• Click on Manager App
• If this asks for password you will need to add user in role in tomcat conf directory tomcat-users.xml file with following values.
• Now restart your apache server.
• After clicking on Manager App undeploy any applications with same name.
• Scroll down and you will see example to deploy war.

• 
  
• Deploy the war and you will be able to goto url
• http://localhost:8080/demojdbc/form.html