#کاربرـحرفهـای

🆔 @javapro_ir
🆔 @group_javapro

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("<h1>سلام از Servlet!</h1>");
    }
}

@WebServlet("/hello")
public class HelloServlet extends HttpServlet {
    // همان کد بالا
}

#کاربرـحرفهـای

🆔 @javapro_ir
🆔 @group_javapro

import jakarta.persistence.*;

@Entity
public class User {

    @Id
    @GeneratedValue
    private Long id;

    private String name;

    private String email;

    // getters & setters
}

EntityManagerFactory emf = Persistence.createEntityManagerFactory("my-unit");
EntityManager em = emf.createEntityManager();

User user = new User();
user.setName("Saleh");
user.setEmail("saleh@example.com");

em.getTransaction().begin();
em.persist(user);
em.getTransaction().commit();

em.close();
emf.close();

<persistence xmlns="http://jakarta.ee/xml/ns/persistence" version="3.0">
  <persistence-unit name="my-unit">
    <class>User</class>
    <properties>
      <property name="jakarta.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/testdb"/>
      <property name="jakarta.persistence.jdbc.user" value="root"/>
      <property name="jakarta.persistence.jdbc.password" value="1234"/>
      <property name="jakarta.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver"/>
      <property name="jakarta.persistence.schema-generation.database.action" value="create"/>
    </properties>
  </persistence-unit>
</persistence>

#کاربرـحرفهـای

🆔 @javapro_ir
🆔 @group_javapro

public class MessageService {
    public void send(String msg) {
        System.out.println("Sending message: " + msg);
    }
}

import jakarta.inject.Inject;

public class NotificationManager {

    @Inject
    private MessageService messageService;

    public void notifyUser() {
        messageService.send("کاربر گرامی، خوش آمدید!");
    }
}

<!-- WEB-INF/beans.xml -->
<beans xmlns="https://jakarta.ee/xml/ns/jakartaee" version="4.0" />

#کاربرـحرفهـای

🆔 @javapro_ir
🆔 @group_javapro

import jakarta.ws.rs.*;
import jakarta.ws.rs.core.MediaType;

@Path("/hello")
public class HelloResource {

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String sayHello() {
        return "سلام دنیا!";
    }

    @GET
    @Path("/{name}")
    @Produces(MediaType.TEXT_PLAIN)
    public String greet(@PathParam("name") String name) {
        return "سلام " + name + " عزیز!";
    }
}

@GET
@Path("/user")
@Produces(MediaType.APPLICATION_JSON)
public User getUser() {
    return new User("Saleh", "saleh@example.com");
}

#کاربرـحرفهـای

🆔 @javapro_ir
🆔 @group_javapro

import jakarta.ejb.Stateless;

@Stateless
public class CalculatorBean {
    
    public int add(int a, int b) {
        return a + b;
    }
}

#کاربرـحرفهـای

🆔 @javapro_ir
🆔 @group_javapro

import jakarta.persistence.*;

@Entity
public class User {
    
    @Id
    @GeneratedValue
    private Long id;

    private String name;

    private String email;

    // Getter و Setterها
}

import jakarta.ejb.Stateless;
import jakarta.persistence.*;

@Stateless
public class UserService {

    @PersistenceContext
    private EntityManager em;

    public void addUser(String name, String email) {
        User user = new User();
        user.setName(name);
        user.setEmail(email);
        em.persist(user); // ذخیره در پایگاه‌داده
    }

    public User findUser(Long id) {
        return em.find(User.class, id); // بازیابی کاربر بر اساس ID
    }
}

#کاربرـحرفهـای

🆔 @javapro_ir
🆔 @group_javapro

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-exec</artifactId>
    <version>1.3</version>
</dependency>

import org.apache.commons.exec.*;

public class ShellCommandExample {
    public static void main(String[] args) {
        try {
            CommandLine cmd = new CommandLine("mkdir");
            cmd.addArgument("-p");
            cmd.addArgument("/tmp/myfolder");

            DefaultExecutor executor = new DefaultExecutor();
            int exitCode = executor.execute(cmd);

            System.out.println("کد خروج: " + exitCode);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import org.apache.commons.exec.*;

import java.io.ByteArrayOutputStream;

public class ShellListDirectory {
    public static void main(String[] args) {
        try {
            CommandLine cmd = CommandLine.parse("ls -la /tmp");

            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            PumpStreamHandler streamHandler = new PumpStreamHandler(outputStream);

            DefaultExecutor executor = new DefaultExecutor();
            executor.setStreamHandler(streamHandler);

            executor.execute(cmd);

            String output = outputStream.toString("UTF-8");
            System.out.println("خروجی دستور:\n" + output);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

#کاربرـپیشرفته

🆔 @javapro_ir
🆔 @group_javapro