Java inject pro

How to inject value into spring bean instance variables

package com.java2novice.beans;

public class Employee

{                   

   private int empId;

    private String name;

    private String role;

public int getEmpId()

{

        return empId;

 }

 public void setEmpId(int empId)

 {

        this.empId = empId;

  }

  public String getName()

  {

        return name;

    }

  public void setName(String name)

   {

        this.name = name;

    }

    public String getRole()

   {

        return role;

    }

    public void setRole(String role)

    {

        this.role = role;

      }

    }

How to inject inner bean in spring

package com.java2novice.beans;

public class Order

{

   private String item;

    private String price;

    private String address;

public String getItem()

{

        return item;

 }

 public void setItem(String item)

 {

        this.item = item;

  }

 public String getPrice()

 {

        return price;

  }

 public void setPrice(String price)

 {

        this.price = price;

  }

  public String getAddress()

  {

        return address;

    }

   public void setAddress(String address)

  {

        this.address = address;

    }

}

Set spring bean scope using annotation

package com.java2novice.beans;

import org.springframework.context.annotation.Scope;

import org.springframework.stereotype.Service;

Scope("prototype")

public class PaymentGateway

{

private Order order;

 public PaymentGateway(Order ord)

 {

        this.order = ord;

  }

 public void setOrder(Order ord)

{

        this.order = ord;

    }

   public void processOrder()

   {

        System.out.println("Processing order: "+order.getItem());

    }

}

How to invoke spring bean init and destroy methods

package com.java2novice.test;

import org.springframework.context.ConfigurableApplicationContext;

importorg.springframework.context.support.ClassPathXmlApplicationContext;

import com.java2novice.beans.NetworkManager;

public class SpringDemo

{

public static void main(String a[])

{

        String confFile = "applicationContext.xml";

        ConfigurableApplicationContext context

                    = new ClassPathXmlApplicationContext(confFile);

        NetworkManager networkMng = (NetworkManager) context.getBean("netManager");

        networkMng.readData();

        context.close();

}

}

Spring bean initialization callback

package com.java2novice.beans;

import java.io.IOException;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import org.springframework.beans.factory.InitializingBean;

public class NetworkManager implements InitializingBean

{

private HttpURLConnection connection;

private String urlStr;

public void setUrlStr(String urlStr)

{

        this.urlStr = urlStr;

 }

 public void afterPropertiesSet()

{

         

        System.out.println("Inside init() method...");

        URL obj;

        try

      {

            obj = new URL(this.urlStr);

            this.connection = (HttpURLConnection) obj.openConnection();

         }

         catch (MalformedURLException e)

         {

            e.printStackTrace();

          }

          catch (IOException e)

         {

            e.printStackTrace();

        }

    }

    public void readData()

    {

        try

       {

            int responseCode = this.connection.getResponseCode();

            System.out.println("Response code: "+responseCode);

           }

           catch (IOException e)

           {

            e.printStackTrace();

        }

    }

}