How to Setup and Execute Java Servlet Program in Localhost Tomcat Server?

Hello Everyone, We are back with some interesting concepts. Java Servlet is a programming language whose work is similar to PHP. It’s a Server-side Scripting Language, and Here, you can Learn to Execute a single Servlet Program.

Through this tutorial, you will learn about these topics

1. Execute Java Servlet Program
2. Install JDK and Xampp
3. Setup all Environment Variables
4. Generate a Class file for the Servlet Java Program
5. Where Should I Place the Created Class File?
6. What Changes Need to do in the web.xml file and where is that file?
7. How to Access My Class File?

Requirements:

• Java Development Kit
• Tomcat Server [ We Use Xampp Package]
• Browser

Overview:

• Install XAMPP and then Install JDK. Set the environment variable to compile regular Java programs using the command prompt. It must point to the lib folder of JDK.
• Setup JAVA_HOME at your environment variable that must be pointed to your Java folder
• Setup CATLINA_HOME at your environment variable that must be pointed to tomcat folder (That’s inside the xampp folder. Xampp is in C:\)
• Compile the java servlet program and generate the class file. Use javac command to generate the class file. It requires the servlet-api.jar file to create the class file. It’s in the lib of tomcat so if you use the xampp its path is like this “C:\xampp\tomcat\lib\servlet-api.jar” After that give your java file path. So the syntax of class file generation is like this – “javac –cp C:\xampp\tomcat\lib\servlet-api.jar [path of your java file]”. Class file will be generated at the same location of your java file.
• Now copy the generated class file to the classes folder of the Tomcat server. The path is like this “C:\xampp\tomcat\webapps\examples\WEB-INF\classes”
• Now edit web.xml file. Which is in the very back folder of classes.
• Now start the tomcat server by pressing CATLINA_START.bat file
• Open the browser and Run the program. Url will be like this http://localhost:8080/….

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Here is the step-by-step process:

1. Install JDK – Download Link Click Here
2. Install Xampp Web Server – Download Link Click Here
3. Now set Environment Variables
   • Go to Environment variable by clicking right click on My computer ->Advanced->Environment Variable->New
   • Set variable for Catalina
     • Variable Name = CATALINA_HOME
       Variable Value = C:\xampp\tomcat\

       

   • Set Variable for Java
     • Variable Name = JAVA_HOME
       Variable Value= C:\Program Files\Java\jdk1.6.0_10

       

   • Set Variable for Java Basic -PATH
     • Variable Name = PATH
       Variable Value= C:\Program Files\Java\jdk1.6.0_10\bin\

       

4. Generate Class File for your Java Program
   • Create a java file(Program)
   • Save the program as Greetings.java(Greetings is Class name-That Program available at our sister site Click Here)
   • Run the Program in Command Prompt, Start->Run->Command prompt(cmd)
   • example – javac -cp C:\xampp\tomcat\lib\servlet-api.jar D:\Greetings.java 
     Here javac is command to compile .java file
     C:\xampp\tomcat\lib\servlet-api.jar is the location for servlet-api.jar file. it must need to compile servlet program.
     D:\Greetings.java is location of my java program file

     

   • Class File is Created in Local Disk D. Because my java program is in D:\
5. Copy the created class file to classes folder of your tomcat server
   • Go to Local Disk D and copy the class file of Greetings.java and paste it in
     C:\->xampp->tomcat->webapps->examples->WEB-INF->classes
   • Open the Classes folder and Paste the Class File

     

6. Open web.xml file and add servlet url pattern
   • Go to C:\xampp\tomcat\webapps\examples\WEB-INF
   • In Classes folder you can find the web.xml file

     

   • Open XML file in notepad and insert the following code to that file
     • <servlet>
             <servlet-name>Greetings</servlet-name>
             <servlet-class>Greetings</servlet-class>
       </servlet>
       

       

       
       Just replace the word Greetings with your class name
     • <servlet-mapping>
       <servlet-name>Class Name</servlet-name>
       <url-pattern>/servlet/CLASS NAME</url-pattern>
       </servlet-mapping>

       

       
       Just replace the word Greetings with your class name
   • Save the file
7. Start the tomcat server
   • Just open CATALINA_START.bat file which is in tomcat folder
   • C:\->xampp->Tomcat->Double Click on the Catalina_Start(Run the tomcat server)

     

The procedure is available in the video tutorial Watch it here