[1주차] Lecture CRUD Servlet 구현

.gitignore

@@ -42,3 +42,6 @@ bin/
 
 ### Mac OS ###
 .DS_Store\ntomcat.8080/
+
+## tomcat
+**/tomcat.8080

http/lectures.http

@@ -0,0 +1,27 @@
+### 강의 목록 조회
+GET http://localhost:8080/lectures
+
+
+### 강의 등록
+POST http://localhost:8080/lectures
+Content-Type: application/json
+
+{
+  "name": "lecture1",
+  "price": "10000"
+}
+
+
+### 강의 수정
+PUT http://localhost:8080/lectures
+Content-Type: application/json
+
+{
+  "id": "1",
+  "name": "lecture-1",
+  "price": "20000"
+}
+
+
+### 강의 삭제
+DELETE http://localhost:8080/lectures?id=1

src/main/java/com/diy/app/Main.java

@@ -1,6 +1,10 @@
 package com.diy.app;
 
+import com.diy.framework.web.server.TomcatWebServer;
+
 public class Main {
     public static void main(String[] args) {
+        TomcatWebServer webServer = new TomcatWebServer();
+        webServer.start();
     }
 }

src/main/java/com/diy/app/lecture/Lecture.java

@@ -0,0 +1,37 @@
+package com.diy.app.lecture;
+
+public class Lecture {
+    private Long id;
+    private String name;
+    private int price;
+
+    public Lecture(Long id, String name, int price) {
+        this.id = id;
+        this.name = name;
+        this.price = price;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+}

src/main/java/com/diy/app/lecture/LectureRepository.java

@@ -0,0 +1,28 @@
+package com.diy.app.lecture;
+
+import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class LectureRepository {
+
+    private static Map<Long, Lecture> lectures = new ConcurrentHashMap<>();
+    private static long sequence = 0L;
+
+    public List<Lecture> getLectures() {
+        return new ArrayList<>(lectures.values());
+    }
+
+    public void save(Lecture lecture) {
+        lecture.setId(++sequence);
+        lectures.put(lecture.getId(), lecture);
+    }
+
+    public void delete(Long lectureId) {
+        lectures.remove(lectureId);
+    }
+
+    public void update(Lecture lecture) {
+        lectures.put(lecture.getId(), lecture);
+    }
+
+}

src/main/java/com/diy/app/lecture/LectureRequest.java

@@ -0,0 +1,19 @@
+package com.diy.app.lecture;
+
+public class LectureRequest {
+    private Long id;
+    private String name;
+    private int price;
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+}

src/main/java/com/diy/app/lecture/LectureService.java

@@ -0,0 +1,28 @@
+package com.diy.app.lecture;
+
+import java.util.Collection;
+
+public class LectureService {
+
+    LectureRepository lectureRepository = new LectureRepository();
+    private static long sequence = 0L;
+
+
+    public Collection<Lecture> getLectures() {
+        return lectureRepository.getLectures();
+    }
+
+    public void register(String name, int price) {
+        Long id = ++sequence;
+        lectureRepository.save(new Lecture(id, name, price));
+    }
+
+    public void modify(Long id, String name, int price) {
+        lectureRepository.update(new Lecture(id, name, price));
+    }
+
+    public void delete(Long id) {
+        lectureRepository.delete(id);
+    }
+}
+

src/main/java/com/diy/app/lecture/LectureServlet.java

@@ -0,0 +1,79 @@
+package com.diy.app.lecture;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import javax.servlet.RequestDispatcher;
+import javax.servlet.ServletConfig;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.util.Collection;
+
+@WebServlet("/lectures")
+public class LectureServlet extends HttpServlet {
+
+    private final LectureService lectureService = new LectureService();
+    private final ObjectMapper objectMapper = new ObjectMapper();
+
+    @Override
+    public void init(final ServletConfig config) throws ServletException {
+        super.init(config);
+    }
+
+    //강의 목록 조회
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        System.out.println("LectureServlet doGet" + req.getRequestURI());
+        RequestDispatcher requestDispatcher = req.getRequestDispatcher("/lecture-list.jsp");
+        Collection<Lecture> lectures = lectureService.getLectures();
+        req.setAttribute("lectures", lectures);
+        requestDispatcher.forward(req, resp);
+    }
+
+    // 강의 등록
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        LectureRequest request = objectMapper.readValue(req.getReader(), LectureRequest.class);
+
+        String name = request.getName();
+
+        int price = request.getPrice();
+
+        lectureService.register(name, price);
+
+        resp.sendRedirect(req.getContextPath() + "/lectures");
+    }
+
+    //강의 수정
+    @Override
+    protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        LectureRequest request = objectMapper.readValue(req.getReader(), LectureRequest.class);
+
+        Long id = request.getId();
+
+        String name = request.getName();
+
+        int price = request.getPrice();
+
+        lectureService.modify(id, name, price);
+
+        resp.sendRedirect(req.getContextPath() + "/lectures");
+    }
+
+    //강의 삭제
+    @Override
+    protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+
+        String idText = req.getParameter("id");
+
+        Long id = Long.parseLong(idText);
+
+        lectureService.delete(id);
+
+        resp.sendRedirect(req.getContextPath() + "/lectures");
+    }
+}
+

src/main/resources/lecture-list.jsp

@@ -11,8 +11,8 @@
 <a href="/lecture-registration.jsp">등록</a>
 <c:forEach var="lecture" items="${lectures}">
     <li>id: ${lecture.id}</li>
-    <li>pw: ${lecture.name}</li>
-    <li>pw: ${lecture.price}</li>
+    <li>name: ${lecture.name}</li>
+    <li>price: ${lecture.price}</li>
     <br>
 </c:forEach>
 </body>