import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;
public class HelloWorldServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html><body>");
out.println("<h1>Hello, World!</h1>");
out.println("</body></html>");
}
}
jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Hello JSP</title>
</head>
<body>
<h1>Hello, <%= request.getParameter("name") %>!</h1>
</body>
</html>
import javax.ejb.Stateless;
@Stateless
public class CalculatorBean implements Calculator {
public int add(int a, int b) {
return a + b;
}
}
import java.sql.*;
public class ExampleJDBC {
public static void main(String[] args) {
String url = "jdbc:mysql://localhost:3306/mydb";
String username = "root";
String password = "password";
try {
Connection conn = DriverManager.getConnection(url, username, password);
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM employees");
while (rs.next()) {
int id = rs.getInt("id");
String name = rs.getString("name");
}
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
