CS

Steps to create a servlet and start it in Tomcat:

Note: instructions with jdk1.7.0_80, newer instructions in Tomcat

Start Tomcat

1. Copy the folder Q:\Java\apache-tomcat-8.5.24 to folder P:\

2. Define the environment variables in the MS-DOS console:

   SET JAVA_HOME=Q:\JAVA\jdk1.7.0_80
   SET CATALINA_HOME=P:\apache-tomcat-8.5.24
   SET PATH=%JAVA_HOME%\bin;%CATALINA_HOME%\bin;%PATH%
   SET CLASSPATH=%CLASSPATH%;%CATALINA_HOME%\lib\servlet-api.jar;%CATALINA_HOME%\lib\Jama-1.0.2.jar;.
   

   It’s recommended to save the previous statements in a bat file (example: sv.bat)

3. Start the Tomcat server with the command:

   startup
   

4. Start the browser and write the address:
   http://localhost:8080

5. Close the Tomcat server with the command:

   shutdown
   

Create a Servlet

1. Step 1 of Start Tomcat (done)

2. Step 2 of Start Tomcat (type sv + return)

3. Create the folder structure of  ”Servlet1” application in the Tomcat installation
   • Create folder “Servlet1” in webapps folder of Tomcat
   • Create folder WEB-INF in webapps\Servlet1\ folder
   • Create folder classes in webapps\Servlet1\WEB-INF folder

   apache-tomcat-8.5.24
   └── webapps
       └── Servlet1
           └── WEB-INF
               └── web.xml
               └── classes
   

4. Create the  HelloWorld.java file in the webapps\Servlet1\WEB-INF\classes folder. HelloWorld.java

   import java.io.*;
   import javax.servlet.*;
   import javax.servlet.http.*;
   
   public class HelloWorld extends HttpServlet{
       public void doGet(HttpServletRequest request, HttpServletResponse response)
         throws ServletException, IOException {
           PrintWriter out = response.getWriter();
           out.println("Hello World");
       }
   }
   

5. Compile with the command javac:

   javac HelloWorld.java
   

6. Create the web.xml file in P:\apache-tomcat-8.5.24\webapps\Servlet1\WEB-INF folder:

   <?xml version="1.0" encoding="ISO-8859-1"?>
   <web-app>
   
   <servlet>
     <servlet-name>primer</servlet-name>
     <servlet-class>HelloWorld</servlet-class>
   </servlet>
   
   <servlet-mapping>
     <servlet-name>primer</servlet-name>
     <url-pattern>/start</url-pattern>
   </servlet-mapping>
   </web-app>
   

7. Start the Tomcat server as in step 3 of Start Tomcat:

   startup
   

8. Start the browser and write the address:
   http://localhost:8080/Servlet1/start

Run from pendrive

To execute the Java programs from a pendrive follow the next steps:

1. Copy the Q:\Java folder to your pendrive
2. Insert the pendrive into your computer.
3. See the letter asigned to your pendrive. Example: F
4. Change to that drive: >F:
5. Execute the .bat file with the definition of the variables

The content of the .bat file, for example s.bat, can be:

SET DRIVE=%cd:~0,3%
SET JAVA_HOME=%DRIVE%Java\jdk1.7.0_80
SET CATALINA_HOME=%DRIVE%Java\apache-tomcat-8.5.24
SET PATH=%JAVA_HOME%\bin;%CATALINA_HOME%\bin;%PATH%
SET CLASSPATH=%CLASSPATH%;%CATALINA_HOME%\lib\servlet-api.jar;%CATALINA_HOME%\lib\Jama-1.0.2.jar;.