Java Server
Java Server means using Java language to build server-side applications.
Server-side applications run on the server and handle client requests.
Java server technology is mainly used for web applications, REST APIs, enterprise software, and large systems.
1. What is Client-Server Model?
In client-server model:
- Client (browser or app) sends request.
- Server receives and processes request.
- Server sends response back to client.
Browser → Request → Java Server
Java Server → Response → Browser
2. How Java Server Works?
- User enters URL in browser.
- HTTP request goes to server.
- Java code runs on server.
- Server processes data (may connect to database).
- Response is sent back to browser.
3. Java Servlet
Servlet is a Java class used to handle HTTP requests and responses.
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloServlet extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("Hello from Servlet");
}
}
4. JSP (Java Server Pages)
JSP allows writing Java code inside HTML.
<%
out.println("Hello JSP");
%>
5. Spring Boot
Spring Boot is a modern Java framework used to build powerful server applications.
@RestController
public class HelloController {
@GetMapping("/hello")
public String hello() {
return "Hello from Spring Boot";
}
}
What Can Java Server Do?
- User login and registration system
- Database connectivity
- REST API creation
- E-commerce website development
- Admin panel development
- File upload and download
Advantages of Java Server
- Secure and reliable
- Platform independent
- Good performance
- Used in enterprise applications
- Handles large traffic
Frontend vs Java Server
- Frontend runs in browser.
- Java Server runs on server.
- Frontend handles UI.
- Java Server handles logic and database.
Conclusion
Java Server is used to build dynamic and secure web applications.
To become a Java backend developer, learn:
- Core Java
- JDBC
- Servlet & JSP
- Spring Boot