Spring 03 (23.04.10)

Jane·2023년 4월 10일
JavaSpring
0

IT 수업 정리

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1. 객체 더 간단하게 만들기

Controller.java (함수 수정)

	@PostMapping("/total2")
	public String kem_form_post2(GradeVO grade) {
		return "grade";
	}

grade.jsp

	총점 : ${ gradeVO.getTotal() }
	<br /> 평균 : ${ gradeVO.getAvg() }
	<br /> toString : ${ gradeVO.toString() }
	<br /> 학점 : ${ gradeVO.getGrade() }
	<hr />
	<h2>parameter 출력</h2>
	총점 : ${ gradeVO.total }
	<br /> 평균 : ${ gradeVO.avg }
	<br /> 학점 : ${ gradeVO.grade }
	<br />

2. Spring으로 MVC 게시판 만들기

2-1. 초기 설정

  • New > Spring Starter Project

  • 버전, 라이브러리 세팅 (dependency, build)

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.6.3</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<groupId>edu.global</groupId>
	<artifactId>ex</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>spring_boot_jy_board</name>
	<description>Board project for Spring Boot</description>

	<properties>
		<java.version>11</java.version>
	</properties>
	<repositories>
		<repository>
			<id>oracle</id>
			<url>http://www.datanucleus.org/downloads/maven2/</url>
		</repository>
	</repositories>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<!-- spring-boot-devtools는 클래스 수정시 웹서버를 재시작하여 결과를 바로 반영 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<!-- 오라클 JDBC 드라이버 -->
		<dependency>
			<groupId>oracle</groupId>
			<artifactId>ojdbc6</artifactId>
			<version>11.2.0.3</version>
		</dependency>

		<!-- MyBatis 라이브러리 -->
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>2.1.4</version>
		</dependency>

		<!-- MyBatis sql pretty -->
		<dependency>
			<groupId>org.bgee.log4jdbc-log4j2</groupId>
			<artifactId>log4jdbc-log4j2-jdbc4.1</artifactId>
			<version>1.16</version>
		</dependency>

		<!-- JSP를 사용하기 위한 라이브러리 -->
		<!-- 톰캣 파서 -->
		<dependency>
			<groupId>org.apache.tomcat.embed</groupId>
			<artifactId>tomcat-embed-jasper</artifactId>
		</dependency>

		<!-- jstl 라이브러리 -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>jstl</artifactId>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.tomcat.maven</groupId>
				<artifactId>tomcat7-maven-plugin</artifactId>
				<version>2.2</version>
				<configuration>
					<url>http://146.56.137.240:8282/manager/text</url>
					<username>admin</username>
					<password>1234</password>
				</configuration>
			</plugin>
			<!-- cmd에 입력 ( 배포 ) : mvnw.cmd tomcat7:redeploy -->
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
					<excludes>
						<exclude>
							<groupId>org.projectlombok</groupId>
							<artifactId>lombok</artifactId>
						</exclude>
					</excludes>
				</configuration>
			</plugin>
		</plugins>
	</build>

</project>

application.properties


#server port number
server.port = 8282

#datasource (oracle)
spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver
spring.datasource.url=jdbc:oracle:thin:@localhost:1521/xe
#spring.datasource.driver-class-name=net.sf.log4jdbc.sql.jdbcapi.DriverSpy
#spring.datasource.url=jdbc:log4jdbc:oracle:thin:@localhost:1521/xe
spring.datasource.username=scott
spring.datasource.password=tiger


#xml location
#mybatis.mapper-locations=classpath:mappers/**/*.xml

#### jsp 
spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp

2-2. 게시판 리스트 보기

BoardVO.java

package edu.global.ex.vo;

import java.sql.Timestamp;

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import lombok.ToString;

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
public class BoardVO {
	private int bid;
	private String bname;
	private String btitle;
	private String bcontent;
	private Timestamp bdate;
	private int bhit;
	private int bgroup;
	private int bstep;
	private int bindent;
}

BoardController.java

package edu.global.ex.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import lombok.extern.slf4j.Slf4j;

@Slf4j
@Controller
@RequestMapping("/jboard/*")
public class BoardController {
	
	@GetMapping("/list")
	public String view_list(Model model) {
		log.info("view_list()...");
		return "/board/list";
	}
	
}

[Log Info]
2023-04-10 12:41:03.976 INFO 7088 --- [nio-8282-exec-2] e.global.ex.controller.BoardController : view_list()...

  • src > main > webapp > WEB-INF > views > board > list.jsp

BoardService.java (기존의 BCommand를 대체)

package edu.global.ex.service;

import java.util.List;

import edu.global.ex.vo.BoardVO;

public interface BoardService {
	public abstract List<BoardVO> getList();
}
/* public, abstract는 생략 가능 */

BoardServiceImpl.java

package edu.global.ex.service;

import java.util.List;

import org.springframework.stereotype.Service;

import edu.global.ex.vo.BoardVO;
import lombok.extern.slf4j.Slf4j;

@Slf4j
@Service
public class BoardServiceImpl implements BoardService {

	@Override
	public List<BoardVO> getList() {
		log.info("getList()..");
		return null;
	}
	
}

BoardDAO.java
(기존의 내용은 만든 것을 가져왔고, 패키지의 이름에 맞게 수정)

package edu.global.ex.repository;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.List;

import org.springframework.stereotype.Repository;

import edu.global.ex.vo.BoardVO;
import lombok.extern.slf4j.Slf4j;

@Slf4j
@Repository
public class BoardDAO {

	private String url = "jdbc:oracle:thin:@localhost:1521:xe";
	private String uid = "scott";
	private String upw = "tiger";

	public BoardDAO() {
		try {
			Class.forName("oracle.jdbc.driver.OracleDriver");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public List<BoardVO> boardSelect() {
		List<BoardVO> boards = new ArrayList<BoardVO>();

		Connection con = null;
		Statement stmt = null;
		ResultSet resultSet = null;

		try {
			String sql = "Select * from mvc_board";

			con = DriverManager.getConnection(url, uid, upw);
			stmt = con.createStatement();
			resultSet = stmt.executeQuery(sql);

			while (resultSet.next()) {
				int bid = resultSet.getInt("bid");

				String bname = resultSet.getString("bname");
				String btitle = resultSet.getString("btitle");
				String bcontent = resultSet.getString("bcontent");

				Timestamp bdate = resultSet.getTimestamp("bdate");

				int bhit = resultSet.getInt("bhit");
				int bgroup = resultSet.getInt("bgroup");
				int bstep = resultSet.getInt("bstep");
				int bindent = resultSet.getInt("bindent");

				BoardVO vo = new BoardVO(bid, bname, btitle, bcontent, bdate, bhit, bgroup, bstep, bindent);
				boards.add(vo);
			}

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (resultSet != null)
					resultSet.close();

				if (stmt != null)
					stmt.close();

				if (con != null)
					con.close();

			} catch (Exception e) {
				e.printStackTrace();
			}
		}

		return boards;
	}

}

BoardServiceImple.java (추가 및 수정)

package edu.global.ex.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import edu.global.ex.repository.BoardDAO;
import edu.global.ex.vo.BoardVO;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;
import lombok.extern.slf4j.Slf4j;

@Slf4j
@Service
@AllArgsConstructor
@NoArgsConstructor
public class BoardServiceImpl implements BoardService {

	@Autowired // 객체 생성 (Injection)
	private BoardDAO dao; // BoardDAO dao = new BoardDAO();
	
	@Override
	public List<BoardVO> getList() {
		log.info("getList()..");
		return dao.boardSelect();
	}
	
}

BoardController.java (수정)

package edu.global.ex.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import edu.global.ex.service.BoardService;
import lombok.extern.slf4j.Slf4j;

@Slf4j // Annotation for [log.info()]
@Controller
@RequestMapping("/jboard/*")
public class BoardController {

	@Autowired
	private BoardService boardService;

	@GetMapping("/list")
	public String view_list(Model model) {
		log.info("view_list()...");
		model.addAttribute("boards", boardService.getList());
		return "/board/list";
	}

}

list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<table width="500" cellpadding="0" cellspacing="0" border="1">
		<tr>
			<td>번호</td>
			<td>이름</td>
			<td>제목</td>
			<td>날짜</td>
			<td>히트</td>
		</tr>
		<c:forEach var="board" items="${boards}">
			<tr>
				<td>${board.bid}</td>
				<td>${board.bname}</td>
				<td><c:forEach begin="1" end="${board.bindent}">-</c:forEach> <a
					href="${pageContext.request.contextPath}/jboard/content_view?bid=${board.bid}">${board.btitle}</a></td>
				<td>${board.bdate}</td>
				<td>${board.bhit}</td>
			</tr>
		</c:forEach>
		<tr>
			<td colspan="5"><a href="write_view">글작성</a></td>
		</tr>
	</table>
</body>
</html>

3. 정리

3-1. 의존성 주입

  • 의존성 (Dependency)
  • 의존성 주입
    • 클래스 간의 의존성을 클래스 외부에서 주입
    • 의존성의 인터페이스화를 통한 코드 유연성 증대
    • 클래스의 인스턴스를 외부에서 생성하여 주입
  • 생성자, setter, Autowired

https://kotlinworld.com/64

3-2. @Component

@Controller
@Service : Command
@Repository : DAO

@Controller :: Controller controller = new Controller();
@Controller("board") :: Controller board = new Controller();

@Autowired : 주입 (객체의 주소값)

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Jane
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이전 포스트

Spring 02 (23.04.07)

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Spring 04 (23.04.11)

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