Serializable : 자바 직렬화

Serializable : 자바 직렬화

자바 시스템 내부/외부 서로 객체 또는 데이터를 공유할 수 있도록
바이트(byte) 형태로 데이터를 변환하고 반대로 다시
바이트 형태의 데이터를 객체 또는 데이터로 변환(역직렬화)하는 기술

package dto;

import java.io.Serializable;

public class Product implements Serializable {
   private static final long serialVersionUID = 
		   -4274708574239677000L;
   //멤버변수
   private String productId; //상품 아이디
   private String pname; //상품명
   private Integer uniPrice; //상품 가격
   private String description; //상품 설명
   private String manufacturer; //상품 설명
   private String category; //분류
   private long unitsInStock; //재고 수
   private String condition; //신상품 or 중고품 or 재생품

   //기본 생성자
   public Product() {
	   super();
   }

   
   //생성자(필수 : madatory 입력 처리)..(참고..선택:optional)
   public Product(String productId, String pname, Integer uniPrice) {
	   super();
	   this.productId = productId;
	   this.pname = pname;
	   this.uniPrice = uniPrice;
   }

   //Getter()/Setter()메서드
   
	
	public String getProductId() {
		return productId;
	}
	
	
	public String getManufacturer() {
		return manufacturer;
	}


	public void setManufacturer(String manufacturer) {
		this.manufacturer = manufacturer;
	}


	public void setProductId(String productId) {
		this.productId = productId;
	}
	
	
	public String getPname() {
		return pname;
	}
	
	
	public void setPname(String pname) {
		this.pname = pname;
	}
	
	
	public Integer getUniPrice() {
		return uniPrice;
	}
	
	
	public void setUniPrice(Integer uniPrice) {
		this.uniPrice = uniPrice;
	}
	
	
	public String getDescription() {
		return description;
	}
	
	
	public void setDescription(String description) {
		this.description = description;
	}
	
	
	public String getCategory() {
		return category;
	}
	
	
	public void setCategory(String category) {
		this.category = category;
	}
	
	
	public long getUnitsInStock() {
		return unitsInStock;
	}
	
	
	public void setUnitsInStock(long unitsInStock) {
		this.unitsInStock = unitsInStock;
	}
	
	
	public String getCondition() {
		return condition;
	}
	
	
	public void setCondition(String condition) {
		this.condition = condition;
	}
	
	
	public static long getSerialversionuid() {
		return serialVersionUID;
	}
	
	
	@Override
	public String toString() {
		return "Product [productId=" + productId + ", pname=" + pname + ", uniPrice=" + uniPrice + ", description="
				+ description + ", category=" + category + ", unitsInStock=" + unitsInStock + ", condition=" + condition
				+ "]";
	}
	   
	  
   
}

ProductRepository.java

package ch04.com.dao;

import java.util.ArrayList;
import java.util.List;
import dto.Product;

//자바빈즈로 사용할 상품 데이터 접근 클래스
public class ProductRepository {
  private List<Product> listOfProducts = new ArrayList<Product>();
  
  //생성자
  public ProductRepository() {
	  Product phone = new Product("P1234", "iPhone 13s", 800000);
	  phone.setDescription("4.7-inch, 1334X750 Renina HD display");
	  phone.setCategory("Smart Phone");
	  phone.setManufacturer("Apple");
	  phone.setUnitsInStock(1000);
	  phone.setCondition("New");
	  
	  Product notebook = new Product("P12345", "LG PC 그램", 1500000);
	  notebook.setDescription("13.3-inch, IPS LED display, 5th Generation");
	  notebook.setCategory("Notebook");
	  notebook.setManufacturer("LG");
	  notebook.setUniPrice(1000);
	  notebook.setCondition("Refurbished");
	  
      Product tablet = new Product("P1236", "Galaxy Tab S", 900000);
      tablet.setDescription("212.8*125.6*6.6mm, Super AMOLED display");
      tablet.setCategory("Tablet");
      tablet.setManufacturer("Samsung");
      tablet.setUnitsInStock(1000);
      tablet.setCondition("Old");
      
      //List<Product> 객체 타입의 변수에 저장
      listOfProducts.add(phone);
      listOfProducts.add(notebook);
      listOfProducts.add(tablet);
	  
  }//end constructor
  
   //객체 타입의 변수 listOfProducts에 저장된 모든 상품 목록을 가져옴
  public List<Product> getAllProducts(){
	  return listOfProducts;
	  
  }
}

products.jsp

<%@page import="dto.Product"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="/css/bootstrap.min.css" />
<title>상품 목록</title>
</head>
<body>
<jsp:useBean id="productDAO" class="ch04.com.dao.ProductRepository" />
<!-- top.jsp 인클루드 시작 -->
  <jsp:include page="/ch03/top.jsp" />
<!-- top.jsp 인클루드 끝 -->
<!-- jumbotron 스타일 시작 -->
   <div class="jumbotron">
       <div class="container">
          <h1 class="display-3">상품 목록</h1>
       </div>
   </div>
<!-- jumbotron 스타일 끝 -->

   <%
      List<Product> listOfProducts = productDAO.getAllProducts();
   %>
   <div class="container">
     <div class="row" align="center">
     <!-- 상품 반복 시작 -->
     <%
       for(int i=0; i<listOfProducts.size();i++){
    	   Product product = listOfProducts.get(i);//하나씩 끄집어내는것
     %>
       <div class="col-md-4">
         <h3><%=product.getPname() %></h3>
         <p><%=product.getDescription() %></p>
         <p><%=product.getUniPrice() %></p>
       </div>
       
       <%
       } //end for
       %>
       
       <!-- 상품 반복 끝 -->
     </div>
   </div>
 <!-- bottom.jsp 인클루드 시작 -->   
    <jsp:include page="/ch03/bottom.jsp"></jsp:include>
 <!-- bottom.jsp 인클루드 끝 -->   
   
</body>
</html>

products2.jsp

<%@page import="dto.Product"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="/css/bootstrap.min.css" />
<title>상품 목록</title>
</head>
<body>
<jsp:useBean id="productDAO" class="ch04.com.dao.ProductRepository" />
<!-- top.jsp 인클루드 시작 -->
  <jsp:include page="/ch03/top.jsp" />
<!-- top.jsp 인클루드 끝 -->
<!-- jumbotron 스타일 시작 -->
   <div class="jumbotron">
       <div class="container">
          <h1 class="display-3">상품 목록</h1>
       </div>
   </div>
<!-- jumbotron 스타일 끝 -->

   <%
   //자바영역
      List<Product> listOfProducts = productDAO.getAllProducts();
   %>
   <c:set var="listOfProducts" value="<%=listOfProducts%>" />
      <!--  자바영역을 jsp세계로 소환( var="listOfProducts" ) -->
   <div class="container">
     <div class="row" align="center">
     <!-- 상품 반복 시작 -->
     <c:forEach var="product" items="${listOfProducts}">
     <%-- ${listOfProducts}는 jsp영역 --%>
       <div class="col-md-4">
         <h3>${product.pname}</h3>
         <p>${product.description}</p>
         <p>${product.uniPrice}</p>
       </div>
       </c:forEach>
       <!-- 상품 반복 끝 -->
     </div>
   </div>
 <!-- bottom.jsp 인클루드 시작 -->   
    <jsp:include page="/ch03/bottom.jsp"></jsp:include>
 <!-- bottom.jsp 인클루드 끝 -->   
   
</body>
</html>